WO2007026841A1 - ポリエステル粒子の熱処理装置及びポリエステル粒子の多段固相重縮合方法 - Google Patents
ポリエステル粒子の熱処理装置及びポリエステル粒子の多段固相重縮合方法 Download PDFInfo
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- WO2007026841A1 WO2007026841A1 PCT/JP2006/317260 JP2006317260W WO2007026841A1 WO 2007026841 A1 WO2007026841 A1 WO 2007026841A1 JP 2006317260 W JP2006317260 W JP 2006317260W WO 2007026841 A1 WO2007026841 A1 WO 2007026841A1
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- Prior art keywords
- stage
- polyester
- phase polycondensation
- temperature
- heat treatment
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- 0 CCCC(C(C)C*)C1*(CCCC(C)C(*)C2)C2*(*(CC)[C@@](CC(CCN)C(CCC2)CC3)CC2*CC(C*)CC(C)C2=*(C)C[C@@]33C2C3C*)C(***O)*1 Chemical compound CCCC(C(C)C*)C1*(CCCC(C)C(*)C2)C2*(*(CC)[C@@](CC(CCN)C(CCC2)CC3)CC2*CC(C*)CC(C)C2=*(C)C[C@@]33C2C3C*)C(***O)*1 0.000 description 2
- FACHDUAMWHEPML-WHFBIAKZSA-N C[C@@H]1N(C)[C@H]1C Chemical compound C[C@@H]1N(C)[C@H]1C FACHDUAMWHEPML-WHFBIAKZSA-N 0.000 description 1
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- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/80—Solid-state polycondensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Definitions
- the present invention relates to a heat treatment apparatus for polyester particles. More specifically, the present invention relates to a heat treatment apparatus suitable for solid-phase polycondensation of particles made of polyester resin through multi-stage heat treatment. The present invention also relates to solid-phase polycondensation by heat-treating a low molecular weight polyester prepolymer in a solid state. The present invention relates to a method for producing polyester.
- the present invention also relates to a method for producing high molecular weight polyethylene terephthalate by heat-treating low molecular weight polyethylene terephthalate in a solid state.
- the present invention relates to a method capable of producing a high molecular weight polyethylene terephthalate in a shorter time than a conventional method by subjecting a low molecular weight polyethylene terephthalate prepolymer to a stepwise heat treatment under a specific condition to carry out a solid phase polycondensation reaction.
- Polyesters typified by polyethylene terephthalate (hereinafter sometimes abbreviated as PET) are excellent in mechanical properties, thermal properties, electrical properties, etc., so fibers and films, sheets, and bottles for various applications. Widely used in molded products such as, the demand is expanding.
- PET polyethylene terephthalate
- PET requires different molecular weights (intrinsic viscosities) depending on its application. For example, it is usually from 0.70 to 0.95 dLZg for bottles and from 0.95 to 0.95 for tire cords. 1. It is said to be 20 dLZg.
- a method of polymerizing the obtained PET prepolymers by bow-condensation followed by solid-phase polycondensation is widely used industrially.
- Solid phase polycondensation usually involves heat treating PET prepolymers obtained by melt polycondensation in an inert gas atmosphere or under reduced pressure. Since a relatively long time is required to reach a desired molecular weight, a production method with higher productivity is desired.
- a PET prepolymer having a relatively low polymerization degree is obtained by melt polycondensation, and this prepolymer is subjected to solid phase polycondensation at a high temperature.
- Patent Document 1 discloses a low molecular weight prepolymer having an average degree of polymerization of about 5 to about 35 (inherent viscosity of about 0.10 to 0.36 dLZg) obtained by melt polycondensation, and an apparent crystallite size of 9 n.
- a method of solid-phase polycondensation after crystallizing to m or more is disclosed.
- this method is not sufficient because the degree of polymerization at the start of solid-phase polycondensation is too low, or because the growth of crystals suppresses the movement of molecules. No condensation reaction rate can be obtained.
- Patent Document 2 describes that solid phase polycondensation of PET prepolymer particles having an intrinsic viscosity of 0.08 force and 0.5 dLZg at a temperature higher than 140 ° C from the glass transition temperature.
- the average particle size of the prepolymer is about lmm or more, and the particles are not fused with each other V, and a sufficient solid phase polycondensation reaction rate is not always obtained in the temperature range!
- Patent Document 3 discloses a solid-phase polycondensation method in which the progress of polymerization takes precedence over the progress of crystallization, that is, the low molecular weight PET prepolymer particles are brought into contact with a heat transfer medium at about 205 ° C to 240 ° C.
- a method for solid-phase polycondensation in an inert gas stream after raising the temperature to a range of temperature in less than 10 minutes is disclosed.
- a thermal shock is applied and the temperature is raised in a very short time to a temperature in the range of about 205 ° C to 240 ° C. Therefore, in order to prevent the particles from fusing together, It is not always a satisfactory method, such as requiring special equipment to prevent the PET prepolymer particles from contacting each other and that this method does not reduce the time required for the solid-phase polycondensation reaction. I helped.
- Patent Document 4 relates to a method of increasing the molecular weight by solid-phase polycondensation of PET, and uses two or more continuous moving beds for the solid-phase polycondensation step.
- Disclosed force of heat treatment process This disclosed technique prevents particles from fusing together during solid phase polycondensation of medium molecular weight PET prepolymer particles with an intrinsic viscosity of approximately 0.5 to 0.65 dLZg.
- the polycondensation reaction rate is not necessarily improved.
- to obtain this medium molecular weight prepolymer its melt weight Condensation equipment is more expensive than equipment that yields low molecular weight prepolymers, so the overall viewpoint is not always satisfactory.
- Patent Document 5 discloses a continuous crystallization apparatus for a polyester material in which an ejection vortex bed having mixing characteristics and a fluid bed having piston flow characteristics are connected to each other. The main purpose is to make the polyester into a granule with a uniform crystallinity and no agglomeration, such as a copolyester, and a solid-state polymerization apparatus as a subsequent process is not described. Absent.
- Patent Document 6 discloses a continuous multistage heat treatment apparatus having a fluid passage in a separation wall between a plurality of fluidization regions, and the first region occupies most of the total volume. It is disclosed. However, as in Patent Document 5, there is no description of a solid phase polymerization apparatus as a subsequent process.
- Patent Document 1 Japanese Patent No. 3626758
- Patent Document 2 Japanese Patent Application Laid-Open No. 2004-67997
- Patent Literature 3 Japanese Translation of Special Publication 2004-537622
- Patent Document 4 US Patent 5408035
- Patent Document 5 Japanese Patent No. 3073498
- Patent Document 6 Special Publication 2005-500928
- the present invention is a polyester particle heat treatment apparatus suitable for carrying out crystallization and solid-phase polycondensation by raising the temperature stepwise, in particular, by heat treating a low molecular weight polyester prepolymer.
- An object of the present invention is to provide a heat treatment apparatus for polyester particles suitable for obtaining a polyester having a molecular weight.
- An object of the present invention is to provide a method for producing a polyester in which low-molecular-weight polyester prepolymer particles are heat-treated and subjected to solid-phase polycondensation at high speed without being fused.
- the present invention is an industry that can heat-treat low molecular weight polyethylene terephthalate prepolymer particles and perform solid phase polycondensation at a high polycondensation reaction rate without causing fusion of the particles to efficiently produce higher molecular weight polyethylene terephthalate.
- a useful production method The porpose is to do.
- a fluidized bed is effective as a crystallization apparatus for polyester particles, and that a moving bed is effective for solid phase polycondensation.
- a solid-phase polycondensation reaction at a high temperature can be performed by preliminarily performing a short-term solid-phase polycondensation at a temperature lower than the solid-phase polycondensation temperature. It has been found that the response speed increases and the overall reaction time can be shortened.
- the gist of the first invention is as follows.
- a heat treatment apparatus for polyester particles in accordance with the flow of the particles, 1) a first fluidized bed,
- a heat treatment apparatus for continuously solid-phase polycondensation of polyester particles is arranged in this order, and the internal volume of the 2nd moving bed is more than twice the internal volume of the 1st moving bed.
- the polyester wherein the first fluidized bed has a fluidized bed region having complete mixing properties arranged on the upstream side and a fluidized bed region having plug flow properties arranged on the downstream side. Particle heat treatment equipment.
- the heat treatment apparatus for polyester particles wherein the second fluidized bed is a fluidized bed having plug flow properties.
- the first moving bed and the Z or second moving bed have a mechanism for circulating an inert gas, and each has a gas inlet at a lower part of the moving bed and a gas outlet at an upper part. And a heat treatment apparatus for polyester particles.
- the first moving floor and the Z or second moving floor have a plurality of regions divided in the vertical direction.
- the polyester particle heat treatment apparatus has a gas inlet at a lower portion of each region and a gas outlet at an upper portion thereof.
- the first moving bed and the Z or second moving bed have a plurality of regions divided in the vertical direction.
- the polyester particle heat treatment apparatus has a mechanism for removing an organic substance and Z or water in the gas in a flow path of the inert gas.
- the polyester particle heat treatment apparatus has a mechanism for condensing and recovering an organic substance and Z or water in the gas in a flow path of the inert gas.
- the polyester particle heat treatment apparatus which has a mechanism for burning an organic substance in the gas and a mechanism for absorbing water in the gas in this order in the flow path of the inert gas.
- the polyester particle heat treatment apparatus is characterized in that it has the order.
- the first moving bed and the Z or second moving bed have a mechanism for flowing an inert gas, and a plurality of regions divided in an upward and downward direction, and at least a non-flowing flow through the uppermost region.
- the active gas flow path has a mechanism for condensing and recovering organic matter and Z or water in the gas, and at least the inert gas flow path for the inert gas flowing through the lowermost region.
- a heat treatment apparatus for a polyester particle characterized by having a mechanism for burning and a mechanism for absorbing water in the gas in this order.
- the heat treatment apparatus for polyester particles characterized in that it has a mechanism for using an organic substance condensed and recovered from an inert gas as part of a raw material for producing polyester particles.
- another gist of the first invention is as follows. Using the heat treatment apparatus described above, solid-phase polycondensation is performed on polyester particles having an intrinsic viscosity of 0.18 to 0.40 dLZg until the intrinsic viscosity of the first moving bed is increased to 0.03 to 0.1 lOdLZg. Furthermore, a multistage solid phase polycondensation method for polyester particles, characterized in that solid phase polycondensation is carried out in the second moving bed to an intrinsic viscosity of 0.70 dL / g or more.
- a part or all of an organic substance produced as a by-product with solid-phase polycondensation is condensed and recovered, and used as part of a raw material for producing polyester particles.
- Multi-stage solid phase polycondensation method [0027]
- the solid-phase polycondensation reaction rate at a high temperature can be increased by preliminarily performing the solid-phase polycondensation at a temperature 15 ° C lower than the solid-phase polycondensation temperature before the solid-phase polycondensation at a high temperature. I found it to be larger and reached the second invention.
- the gist of the second invention is as follows.
- a polyester including a heat treatment for obtaining a polyester by heat-treating a polyester prepolymer having an intrinsic viscosity of 0.18 dLZg or more and 0.40 dLZg or less in a solid state to increase the intrinsic viscosity of the polyester prepolymer by 0.50 dLZg or more.
- a process for producing a polyester characterized in that the heat treatment is divided into n stages and satisfies the following conditions.
- the j-th stage temperature (Tj) is 190 ° C or higher and 230 ° C or lower, and the intrinsic viscosity increase value in the j-th stage is 0.03 dLZg or higher.
- the difference between the intrinsic viscosity at the end of the jth stage and the intrinsic viscosity at the start of the kth stage is 0.1 lOdLZg or less.
- n is an integer greater than or equal to 2
- j and k are integers satisfying l ⁇ j ⁇ k ⁇ n.
- Another gist of the second invention is as follows.
- a method for producing a polyester comprising a heat treatment in which a polyester prepolymer having an intrinsic viscosity of 0.18 dLZg or more and 0.40 dLZg or less is heat-treated in a solid state, and the intrinsic viscosity of the polyester prepolymer is increased by 0.50 dLZg or more to obtain a polyester.
- the heat treatment is a first stage for crystallizing the polyester prepolymer at a temperature Tla (° C), and a solid phase polycondensation of the crystallized polyester prepolymer at a temperature T2a (° C).
- the product obtained in the 2nd and 2nd stages is heated to the temperature T3a (° C) .
- the 3rd stage, and the product obtained in the 3rd stage is subjected to solid phase polycondensation at the temperature T4a (° C).
- Tla, T2a, T3a, T4a (° C) satisfy the following (formula 4a) to (formula 7a): The butterflies, the production method of polyester. (Formula 4a) 100 ⁇ Tla ⁇ 200
- the solid phase polycondensation step is performed stepwise, and the previous step in the step, that is, the first stage solidification step is performed. If the polycondensation step is carried out at a temperature that is 15 ° C or more lower than the temperature of the latter step, that is, the second-stage solid-phase polycondensation step, the solid-phase weight throughout the first and second-stage solid-phase polycondensation steps. The inventors found that the condensation reaction rate was increased and reached the third invention.
- the gist of the third invention is that a polyethylene terephthalate prepolymer having an intrinsic viscosity of 0.18 dLZg or more and 0.40 dLZg or less is subjected to heat treatment in a solid state to obtain a polyethylene terephthalate having an intrinsic viscosity of 0.7 OdL / g or more.
- the polyethylene terephthalate prepolymer is heat-treated at a temperature (Tib) of 200 ° C. or more and 225 ° C. or less, in an inert gas atmosphere or under reduced pressure, and an average residence time of 0.5 hours or more and 10 hours or less.
- Tib temperature of 200 ° C. or more and 225 ° C. or less
- Prepolymers that have undergone the first solid phase polycondensation process are heat-treated at a temperature (T2b) of 215 ° C or higher and 240 ° C or lower under an inert gas atmosphere or under reduced pressure with an average residence time of 2 hours or longer.
- the conditions in the solid phase polycondensation are examined in detail, and include the "first stage solid phase polycondensation process", the “temperature rise process” and the “second stage solid phase polycondensation process” in this order,
- the reaction rate of the second-stage solid phase polycondensation process is increased, which is higher than the usual method.
- high molecular weight polyethylene terephthalate can be produced in a short time, and reached the fourth invention. That is, the fourth invention is summarized as follows.
- a method for producing a polyethylene terephthalate wherein a polyethylene terephthalate prepolymer having an intrinsic viscosity of 0.18 dLZg or more and 0.40 dLZg or less is heat-treated in a solid state to have an intrinsic viscosity of 0.70 dLZg or more.
- the heat treatment includes a first-stage solid phase polycondensation step, a temperature rising step, and a second-stage solid phase polycondensation step in this order, and each step satisfies the following 1) to 3):
- a method for producing polyethylene terephthalate A method for producing polyethylene terephthalate.
- First stage solid-phase polycondensation process power This is a process in which polyethylene terephthalate prepolymers are heat-treated in an inert gas atmosphere or under reduced pressure, and the heat treatment temperature (Tic) is 190 ° C or higher and 225 ° C or lower. It is a process.
- the temperature of the heat treatment (T lc) of the first stage solid phase polycondensation step is performed on the polyethylene terephthalate preform after passing through the first stage solid phase polycondensation step in an inert gas atmosphere or under reduced pressure. This is the process of starting the temperature rise from the lower temperature to the temperature (T2c), raising the temperature from temperature Tic (° C) to (Tic + 15) ° C within 30 minutes, and temperature Tic (° C) and T2c (° C) satisfy the following (formula lc) and (formula 2c).
- the second stage solid-phase polycondensation step is a step of heat-treating the polyethylene terephthalate prepolymer obtained through the first stage solid-phase polycondensation step and the temperature raising step in an inert gas atmosphere or under reduced pressure, and
- This heat treatment temperature (T3c) is 190 ° C or higher and 240 ° C or lower.
- the apparatus of the first invention enables stepwise temperature rise, and solid-phase polycondensation can be carried out at a high speed without fusing low molecular weight polyester prepolymer particles.
- the melt polycondensation process can be relatively simplified, leading to cost reduction of the entire polyester production apparatus.
- the resulting high molecular weight polyester has applications in a wide range of fields such as fibers, fabrics, molding oils and beverage bottles.
- the method for producing a polyester of the second invention there is provided a method for producing a polyester that undergoes solid phase polycondensation at high speed without fusing low molecular weight polyester prepolymer particles.
- the polyester obtained by this method can be used for a wide range of applications such as beverage bottles and industrial fibers.
- PET obtained by this method has a high molecular weight and can be used in a wide range of applications such as beverage bottles and industrial fibers.
- low molecular weight PET prepolymers can be used, the equipment load in the melt polycondensation process can be reduced, and this is an economically advantageous method.
- the solid-phase weight can be obtained at a high polycondensation reaction rate without fusing the low molecular weight PET prepolymer particles obtained by melt polycondensation.
- High molecular weight PET can be efficiently produced by condensation. That is, in the PET production method of the fourth invention, the PET prepolymer particles obtained by melt polycondensation are heat-treated in an inert gas atmosphere or under reduced pressure, that is, polycondensation (solid phase polycondensation) proceeds in a solid state. Therefore, it is a method for efficiently producing PET having a desired high molecular weight suitable for various applications.
- a PET prepolymer having a low molecular weight is used, and solid-phase polycondensation is performed under predetermined conditions. Is a requirement.
- the conditions as in the conventional method that is, the case where the solid-phase polycondensation is performed at 190 ° C in one stage and at 240 ° C in a single stage are higher than those in the high molecular weight region.
- productivity can be improved and energy can be saved by shortening the solid phase polycondensation time and reducing the amount of heat required for polycondensation.
- FIG. 1 shows an example of a heat treatment apparatus according to the first invention.
- FIG. 2 shows another example of the heat treatment apparatus of the first invention.
- FIG. 3 is an example showing the internal structure of the second moving bed D of the first invention.
- FIG. 4 is an example of a block diagram showing an inert gas circulation passage in the polyester heat treatment apparatus of the first invention.
- FIG. 5 is another example of a block diagram showing an inert gas circulation flow path in the polyester heat treatment apparatus of the first invention.
- FIG. 6 An example of a reactor in which a fluidized bed having perfect mixing properties and a fluidized bed having plug flow properties are combined.
- FIG. 7 is another example of a device for processing an inert gas discharged.
- FIG. 8 Second moving bed force This is an example of an equipment diagram that processes the inert gas discharged in a vertical direction.
- FIG. 9 is a schematic view showing a heat treatment apparatus used in Examples and Comparative Examples.
- FIG. 10 is a schematic diagram showing a fusion test apparatus used in Examples and Comparative Examples.
- A1 Fluidized bed with perfect mixing
- Line 1 Flow path of polyester prepolymer particles
- Line 2 Flow path of crystallized polyester prepolymer particles
- Line 3 Flow path of polyester particles after the first stage solid phase polycondensation
- Line 4 Flow path of polyester particles after first-stage solid-phase polycondensation with rapid temperature rise
- Line 5 Flow path of polyester particles after the second stage solid phase polycondensation
- Line 6 Product flow path
- Line 7 Inert gas flow path
- Line 11 Extraction flow path for ethylene glycol-free clubber
- Line 12 New supply flow path for ethylene glycol
- Line 15 Ethylene glycol scrubber inert gas recovery flow path
- Line 16 Air supply flow path
- the first invention is an apparatus for heat treatment of polyester particles, and is arranged along the flow of the particles, 1) a first fluidized bed, 2) a first moving bed, 3) a second fluidized bed, 4) a second moving bed.
- the internal volume of the second moving bed is at least twice the internal volume of the first moving bed, and the heat treatment apparatus for continuous solid-phase polycondensation of polyester particles It is.
- FIG. 1 shows an example of the heat treatment apparatus of the first invention.
- A is the first fluidized bed
- B is the first moving bed
- C is the second fluidized bed
- D is the second moving bed
- E is the cooler.
- G—G ′ indicates an inert gas flow path.
- Thick line 1, 2, 3, 4, 5, 6 indicates the flow of polyester particles
- the polyester particles obtained by melt polycondensation are quantitatively and continuously introduced into the first fluidized bed A having complete mixing properties through the line 1 from the upstream process.
- the first fluidized bed A is maintained at 100 to 200 ° C, preferably 150 to 190 ° C, and the polyester particles are heat-treated for 2 to 30 minutes for crystallization.
- the first fluidized bed A has a perforated plate and, if necessary, a stirring mechanism, and is heated and fluidized by an inert gas introduced from an external cover, not shown. Nitrogen is usually used as the inert gas, and the linear velocity of the gas for fluidization depends on the size of the polyester particles. Usually 0.3-2 mZ seconds, preferably 0.5-1.5 mZ About seconds are selected.
- the first fluidized bed A has a mechanism that can discharge particles quantitatively and continuously, such as an overflow gate and a rotary valve.
- FIG. 1 shows one fluidized bed (one reactor) with perfect mixing, but as another example, the force that appears to be one reactor in appearance
- a reactor having a bed area is mentioned.
- FIG. 6 shows an example of a reactor having a fluidized bed region having complete mixing properties arranged on the upstream side and a fluidized bed region having plug flow properties arranged on the downstream side.
- “having complete mixing” means that particles in a reactor that is not force-rich in a so-called “ideal complete mixing” state are quickly brought into the reactor.
- the vector sum of the moving speeds of all particles in the reactor is approximately 0 (zero) (the moving direction of the particles is approximately random).
- a fluidized bed having complete mixing properties can be formed by sufficiently increasing the linear velocity of the fluidized gas.
- the structure and conditions of the fluidized bed can be appropriately selected within the range in which the effect of the first invention can be obtained according to the size of the reactor to be used and the physical properties of the polyester particles.
- “having plug flow” means that the particles stay in the reactor not in the case of a force in a so-called “ideal extrusion flow (also referred to as” piston flow ”) state.
- the vector sum of the moving speeds of all the particles in the reactor, including that the residence time is substantially constant, and that there is substantially no particle with a residence time of about 0 seconds. Is almost parallel to the vector directed from the entrance to the exit of the particle.
- a partition plate is provided in the flow direction, the flow direction is inclined downward, and the jet direction or flow direction of the mobilized gas is directed from the particle inlet to the outlet.
- a fluidized bed having plug flow properties can be formed.
- the structure and conditions of the fluidized bed depend on the size of the reactor used and the physical properties of the polyester particles. It can select suitably in the range with which the effect of this invention is acquired.
- al is a horizontal perforated plate
- a2 is an inclined perforated plate
- b is a stirring mechanism
- c and d are partition plates.
- the front stage (the left reaction chamber divided by the partition plate c) forms a fluidized bed region having complete mixing properties
- the rear stage forms a fluidized bed region having plug flow properties.
- Such a fluidized bed reactor is effective in avoiding the fusion of the polyester particles.
- the polyester particles discharged from the first fluidized bed A are introduced quantitatively and continuously into the first moving bed B via the line 2.
- the first moving bed B is maintained at 190 to 230 ° C, preferably 200 to 215 ° C, and the polyester particles are heat treated for 1.5 to 5 hours, and the first stage solid phase polycondensation is performed.
- the intrinsic viscosity of the polyester particles used in the first moving bed B is preferably 0.18 to 0.40 dL Zg, and the intrinsic viscosity of the polyester particles is preferably at least 0.03 dLZg, preferably by solid phase polycondensation. Is processed to rise about 0.05-0. LOdLZg.
- the first moving bed B has a mechanism for discharging the particles quantitatively and continuously, such as a rotary valve, at the bottom, and the polyester particles move from above to below.
- the inert gas has a gas inlet at the bottom and a gas outlet at the top, while the inert gas moves upward (countercurrent), the upward force also moves downward (cocurrent), or in the horizontal direction (horizontal).
- Organic substances and water mainly composed of glycols by-produced by solid-phase polycondensation are discharged to the outside (G ') of the first moving bed B along with inert gas introduced from the outside G. (In Fig. 1, G and G 'are not shown on the first moving bed B).
- the polyester particles discharged from the first moving bed B are quantitatively and continuously introduced into the second fluidized bed C via the line 3.
- the second fluidized bed C has a function of rapidly raising the temperature of the polyester particles obtained by the first stage solid phase polycondensation, and is preferably a fluidized bed having plug flow properties.
- the second fluidized bed C has a perforated plate and, if necessary, a stirring mechanism, and the polyester particles are maintained in a fluidized state by an inert gas introduced from an external cover (not shown). Meanwhile, the polyester particles are heated to 230-245 ° C.
- This temperature is at least 15 ° C higher than the temperature of the first stage solid phase polycondensation, and is the same as the temperature of the subsequent second stage solid phase polycondensation, or 1 to 8 ° C, preferably 3 to 6 °.
- C Controlled to high temperature. This is because it is possible to make it difficult for the polyester particles to fuse with each other in the second moving bed.
- the residence time of the second fluidized bed C is usually within 30 minutes, preferably within 25 minutes, more preferably 20 minutes. It is controlled to be within.
- the effect of the multistage solid phase polycondensation of the first invention is further increased by rapidly raising the temperature with such a residence time.
- the second fluidized bed C like the first fluidized bed A, has a mechanism that can discharge particles quantitatively and continuously, such as an overflow gate and a rotary valve.
- the polyester particles discharged from the second fluidized bed C are introduced quantitatively and continuously into the second moving bed D via the line 4, where the second stage solid phase polycondensation is performed.
- the temperature of the second stage solid phase polycondensation is preferably 15 ° C. or more and 250 ° C. or less higher than the temperature of the first stage solid phase polycondensation.
- the internal volume of the second moving bed D is set in the range of 2 times or more, preferably 3 to 8 times that of the first moving bed B. This reaction space is necessary to give sufficient residence time to the polyester particles.
- the residence time depends on the temperature, but a range force of usually 5 to 50 hours, preferably 8 to 20 hours, is also selected.
- the second moving bed D has the same mechanism as the first moving bed B, and the polyester particles move from the top to the bottom.
- the polyester particles are subjected to heat treatment for a predetermined residence time and undergo solid phase polycondensation, and the intrinsic viscosity becomes 0.70 dLZg or more, preferably 0.80 dLZg or more.
- organic substances and water mainly composed of glycols by-produced by solid phase polycondensation are discharged from G ′ to the outside of the second moving bed D along with the inert gas introduced by G (Countercurrent contact).
- an inert gas is introduced from G ′ to be brought into co-current contact with the polymer particles, and a gas inlet is provided at the lower part and a gas outlet is provided at the upper part.
- the inert gas discharged from the first moving bed B and the second moving bed D is independently or combined and separately led to a gas treatment process, and the organic substances and / or water contained therein are condensed and recovered. It is preferable to do this.
- the inert gas after condensing and recovering organic matter and Z or water can be circulated in the system and reused.
- the second moving bed D like the first moving bed B, has a mechanism for discharging particles quantitatively and continuously, such as a rotary nozzle, at the bottom, and the polyester particles move from the top to the bottom.
- the polyester particles discharged from the second moving bed D are introduced into the cooler E via the line 5. Cooling is necessary to stabilize the quality of the solid phase polycondensed polyester particles (product).
- the structure of the cooler E is not limited. For example, a fluidized bed with plug flow properties is used, and the cooling time can be cooled to around room temperature with a residence time of about 10 to 30 minutes. I like it.
- the cooled polyester particles are transported via line 6 to a non-illustrated product production process.
- FIG. 2 shows another example of the heat treatment apparatus of the first invention.
- A1 is a fluidized bed area with perfect mixing
- A2 is a fluidized bed area with plug flow
- B is the first moving bed
- C is the second fluidized bed
- D is the second moving bed
- E is the cooler Respectively.
- A1 is a fluidized bed arranged upstream along the flow of polyester particles
- A2 is a fluidized bed arranged downstream, so that A1 and A2 are combined.
- the structure of A1 is composed of a perforated plate, a stirring mechanism, a partition plate, and the like, and is heated and fluidized by an inert gas introduced with an external force not shown.
- Inert gas is usually introduced into A2.
- the advantage of crystallization of melt-polycondensed polyester particles in such a two-stage process is that particles with insufficient crystallization with a short residence time in A1 are sufficient in A2. Can be crystallized.
- a moving bed or a fluidized bed with plug flow properties is installed in the first stage, so that amorphous particles are unevenly distributed in the apparatus, and as a result, the polyester particles are easily fused. This is disadvantageous.
- a mode in which a fully mixed fluidized bed is provided in the first stage is preferred.
- FIG. 3 is an example showing the internal structure of the second moving bed D of the first invention.
- D1 is the first area of the second moving bed
- D2 is the second area of the second moving bed
- D3 is the third area of the second moving bed.
- Gl-Gl, G2-G2, and G3-G3 indicate the inert gas flow paths to the regions Dl, D2, and D3, respectively.
- (1) shows an embodiment in which the polyester particles and the inert gas are in countercurrent contact
- (2) shows an embodiment in which the polyester particles and the inert gas are in contact in a perpendicular direction.
- the second moving bed D is divided into three regions in the vertical direction, and has a structure in which a flow path for introducing and discharging the inert gas is provided independently for each of the divisions.
- Poly The mer particles stay in the second moving bed D for a long time, and a large amount of glycols and water are by-produced.
- the amount of by-product is not uniform in the vertical direction of the second moving bed D.
- the amount of by-product glycol is higher in the upward direction. Therefore, by adopting the second moving bed D having the structure shown in FIG. 3, the amount of inert gas introduced can be controlled independently in each region, and at the same time, the inert gas having different by-product glycol concentrations can be controlled. There is an advantage that each can be recovered independently. In some cases, the temperature of the region can be controlled independently for each section.
- Fig. 3 shows the moving floor divided into three regions in the vertical direction, but the number of divisions is not limited and can be divided into 2 to 6 as necessary.
- the size of each region may be the same or different.
- the inert gas flow paths may be independent for each region, but some of them may be combined.
- the first moving bed B can be divided into a plurality of areas in the same manner as the second moving bed D.
- FIG. 4 is an example of a block diagram showing a flow path when an inert gas circulates in the polyester heat treatment apparatus of the first invention.
- A, B, C, D, E and lines 1, 2, 3, 4, 5, 6 are the same as those in FIG. 1st fluidized bed A, 1st moving bed B, 2nd fluidized bed C, and 2nd moving bed D
- the inert gas from which the force is discharged is combined, and the organic matter and Z or water are passed through line 8. It is guided to a condenser F which is a mechanism for removing, particularly preferably, a mechanism for condensing and recovering.
- FIG. 4 shows the entire flow path through which the inert gas circulates, and the valve for opening and closing the flow path is omitted. Therefore, it does not necessarily mean that an inert gas flows through all of the flow paths.
- FIG. 5 is another example of a block diagram showing a flow path through which an inert gas circulates in the polyester heat treatment apparatus of the first invention.
- H indicates a heat exchanger.
- This is an example of a heat balance optimization design that takes into account the temperature and heat capacity of the inert gas discharged from each process.
- FIG. 6 is an example of a reactor having a fluidized bed region having complete mixing properties arranged on the upstream side and a fluidized bed region having plug flow properties arranged on the downstream side.
- FIG. 7 is another example of an apparatus diagram for processing the first moving bed and the inert gas discharged from the Z or second moving bed force.
- J is an ethylene glycol scrubber
- K is a catalyst layer
- L is a desiccant layer.
- the inert gas discharged from the gas discharge channel G ′ comes into countercurrent contact with the dripping cold ethylene glycol, and the organic matter and Z or water contained in the gas condense.
- the ethylene glycol containing condensate also draws the scrubber J force via line 11, a portion of which is led to the purification process via line 14 and the remainder is circulated.
- Ethylene glycol is newly supplied from line 12, is cooled by heat exchange together with circulating ethylene glycol, and is supplied to the top of scrubber J via line 13.
- the inert gas from which the condensed components have been removed is introduced into the catalyst layer K via the line 15 and is combusted by the air supplied from the line 16.
- the inert gas after the combustion treatment passes through the desiccant layer L to remove moisture, and a purified inert gas is obtained via the line 18.
- the purified inert gas is circulated and used in the inert gas introduction channel G.
- the condensed components organic matter and Z or water
- the condensed components can be removed more efficiently than in the apparatuses shown in FIGS. 4 and 5, and it can be circulated and used as an inert gas with higher purity. it can.
- FIG. 8 is an example of an apparatus diagram that processes the inert gas discharged in the second moving bed force in the vertical direction.
- the second moving bed D is divided into two upper and lower regions, and the inert gas discharged from the upper region D1 is processed by the ethylene glycol scrubber J. Since the amount of by-produced ethylene glycol is large, the recovery should be emphasized and in line with its purpose.
- the inert gas discharged from the lower region D2 of the second moving bed D is treated in the catalyst layer K and the desiccant layer L. Equipment arrangement suitable for circulating inert gas with high purity.
- the first moving bed B can also be divided into two upper and lower areas Bl and B2. In this case, since the amount of ethylene glycol by-produced in any region is large, treatment with ethylene glycol scrubber J is preferable.
- the organic matter condensed and recovered from the inert gas as described above mainly contains the diol used in the production of the polyester particles, so that it is a raw material for producing the polyester particles. It can be preferably used as a part. Therefore, the heat treatment apparatus of the present invention produces polyester particles from organic substances condensed and recovered from an inert gas. It is preferable to have a mechanism for use as a part of the raw material.
- the method for using the recovered organic substance as a part of the raw material is not particularly limited. For example, it can be used as a part of the raw material for preparing the raw material slurry in the manufacturing method of the polyester prepolymer described below. That's fine.
- the basic unit for producing the polyester obtained by the solid phase polycondensation method of the present invention is improved. preferable.
- polyester particle heat treatment apparatus of the first invention 1) the first fluidized bed, 2) the first moving bed, 3) the second fluidized bed, 4) the second moving bed, and the fluidized bed division
- the auxiliary equipment such as the mechanism, cooler, condensing device, inert gas circulation channel, and heat balance optimization design were explained.
- polyester particles applied to the device, solid phase of the polyester particles In the following, the polyester particles obtained by melt polycondensation are specifically referred to as “polyester prepolymer particles”.
- polyester prepolymer particles obtained by melt polycondensation are heat-treated in an inert gas atmosphere or under reduced pressure, and polycondensation (solid phase polycondensation) proceeds in a solid state for molding.
- polycondensation solid phase polycondensation
- Solid phase polycondensation is performed until a polyester having a molecular weight of 5 is obtained.
- a higher polycondensation reaction rate can be obtained in the high molecular weight region than when solid-phase polycondensation is carried out at a relatively high temperature from the beginning. The reason is not clear, but is estimated as follows.
- the heat treatment means a drying step, a temperature raising step, a crystallization step, a solid phase polycondensation step, etc.
- intrinsic viscosity is used as an index of molecular weight.
- the method for producing the polyester prepolymer used in the first invention is not particularly limited, and usually a conventional method for producing polyester may be used. Specifically, it is usually produced by subjecting a dicarboxylic acid and Z or an ester-forming derivative thereof and a diol to melt polycondensation using a polycondensation catalyst via an esterification reaction and Z or transesterification reaction. . Specifically, for example, dicarboxylic acid and diol are introduced into a slurry preparation tank, stirred and mixed to obtain a raw material slurry, and water generated by the reaction under normal pressure to pressure and heating in an esterification reaction tank.
- polyester low molecular weight product (oligomer) as an esterification reaction product is transferred to a polycondensation tank, and a polycondensation catalyst is used under reduced pressure and heating. Polyester prepolymer is obtained by melt polycondensation.
- the polycondensation reaction catalyst for the polyester prepolymer is not particularly limited, and a known catalyst can be used.
- germanium compounds such as diacid germanium, tetraacid germanium, germanium hydroxide, germanium oxalate, germanium tetraethoxide, germanium tetra-butoxide, antimony trioxide, antimony pentoxide, antimony acetate , Antimony compounds such as methoxyantimony, tetra-n-propyl titanate, tetra-i-propyl titanate, tetra-n-butyl titanate, titanium compounds such as titanium oxalate and potassium titanium oxalate, etc., alone or in combination. Of these, titanium compounds are preferably used because of their high polycondensation reaction activity.
- the amount of catalyst used is usually 1 to 400 ppm by mass with respect to the polyester prepolymer obtained.
- Phosphorus compounds such as orthophosphoric acid, orthophosphoric acid alkyl ester, ethyl acyl phosphate, triethylene glycol acid phosphate, phosphorous acid, and phosphorous acid alkyl ester can be used as a stabilizer.
- the amount to be used is preferably 1 to 1000 ppm by weight, particularly preferably 2 to 200 ppm by weight, based on the polyester prepolymer obtained.
- lithium acetate, sodium acetate, potassium acetate, magnesium acetate, magnesium hydroxide, magnesium alkoxide, magnesium carbonate, potassium hydroxide, calcium hydroxide Compounds of alkali metals and alkaline earth metals such as shim, calcium acetate and calcium carbonate can also be used with the polycondensation catalyst.
- the dicarboxylic acid component is an ester-forming derivative of dicarboxylic acid, such as dimethyl terephthalate, having an appropriate melting point, it is melted without slurry with diol and transesterified with diol. It can also be used for the reaction.
- dicarboxylic acid component is an ester-forming derivative of dicarboxylic acid, such as dimethyl terephthalate, having an appropriate melting point, it is melted without slurry with diol and transesterified with diol. It can also be used for the reaction.
- esterification reaction tank or transesterification reaction tank
- melt polycondensation reaction tank are each in one stage. Or multiple stages.
- Examples of the process for producing a polyester prepolymer to which the first invention can be applied particularly preferably include a process for producing polyethylene terephthalate and Z or polybutylene terephthalate. That is, in the production process, the main components of dicarboxylic acid are terephthalic acid and Z or dimethyl terephthalate, and the main components of diol are ethylene glycol and Z or 1,4-butanediol.
- main component 85 mole 0/0 or terephthalic acid the total dicarboxylic acid component, preferably more preferably 90 mol 0/0 or more accounted for 95 mole 0/0 or more, ethylene glycol and, It means that Z or 1,4 butanediol accounts for 85 mol% or more, preferably 90 mol% or more, more preferably 95 mol% or more of the total diol component.
- dicarboxylic acid components other than terephthalic acid include phthalic acid, isophthalic acid, dib-mouthed moisophthalic acid, sodium sulfoisophthalic acid, phenol-dioxydicarboxylic acid, 4,4, -diphenyldicarboxylic acid, 4 4,4'-diphenyl ether dicarboxylic acid, 4,4'-diphenyl ketone dicarboxylic acid, 4,4'-diphenoxyethanedicarboxylic acid, 4,4'-diphenylsulfone dicarboxylic acid, 2,6 naphthalenedicarboxylic acid, etc.
- Arocyclic dicarboxylic acids such as aromatic dicarboxylic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, and succinic acid, dartaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid
- examples thereof include aliphatic dicarboxylic acids such as undecadicarboxylic acid and dodecadicarboxylic acid, and ester-forming derivatives thereof. It is.
- diol components other than ethylene glycol and 1,4 butanediol include, for example, trimethylene glycol and pentamethylene glycol.
- the polyester prepolymer obtained by the melt polycondensation reaction is supplied to a die head connected to the melt polycondensation reaction tank via a pipe and / or a gear pump and / or a filter, and is provided at the tip of the die. From a plurality of die holes, it is discharged in strands or drops.
- the discharged polyester prepolymer is formed into particles by, for example, a strand cutter.
- the polyester prepolymer particles used in the first invention usually have an average particle size of 0.5 to 3.
- Omm is preferred 0.6 mm or more is more preferred, particularly preferably 0.65 mm or more, while 2. Omm or less is more preferred, more preferably 1.8 mm or less, particularly preferably 1.6 mm or less. It is. If the average particle size is less than 0.5 mm, the amount of fine powder increases when the particles are formed, and troubles during transfer are likely to occur in the subsequent processes. If the average particle size exceeds 3 mm, the required solid-phase polycondensation time tends to be very long regardless of the effect of the first invention.
- the average particle size of the particles is determined by creating an integrated distribution curve by the dry sieving test method described in JISK0069 and taking the value when the cumulative percentage is 50% as the average particle size.
- the intrinsic viscosity of the polyester prepolymer used in the first invention is 0.18 to 0.40 dL / g.
- the lower limit is preferably 0.20 dLZg
- the upper limit is preferably 0.38 dLZg, particularly preferably 0.35 dLZg. If it is less than the lower limit, fine powder is likely to be generated during particle formation. In addition, even if the effect of the first invention is taken into account, the necessary solid phase polycondensation time becomes very long, which is not preferable.
- expensive equipment for performing high-viscosity liquid stirring and high-vacuum reaction in the melt polycondensation process is required, and the effect of the first invention is diminished.
- the terminal carboxyl group concentration of the polyester prepolymer of the first invention is preferably 100 equivalents Z ton or less. More preferably, it is 70 equivalents Z ton or less, more preferably 40 equivalents Z ton or less, particularly preferably 20 equivalents Z ton or less. If it exceeds 100 equivalents of Z ton, the polycondensation reaction rate tends to decrease in the subsequent solid phase polycondensation step.
- the polyester prepolymer particles obtained as described above are heat-treated in a solid state and solid-phase polycondensed to a predetermined intrinsic viscosity by the method of the first invention.
- the heat treatment in the first invention is divided into a plurality of steps such as crystallization, first stage solid phase polycondensation, temperature rise, and second stage solid phase polycondensation.
- the first invention is an apparatus suitable for continuously performing the above heat treatment.
- the intrinsic viscosity of the polyester obtained in the first invention is preferably 0.70 dLZg or more, particularly preferably 0.80 dL / g or more. When it is less than 0.70 dL / g, the effect of increasing the solid phase polycondensation reaction rate of the first invention does not lead to an improvement in productivity.
- the solid phase polycondensation step of the heat treatment of the first invention is carried out in a moving bed extending over at least two stages.
- the first stage solid phase polycondensation temperature is 190-230 ° C, and the lower limit is preferably 195 ° C, more preferably 205 ° C.
- the upper limit is preferably 220 ° C, more preferably 215 ° C. If it is less than 190 ° C, the solid-phase polycondensation rate in the first stage decreases, and the load of the second-stage solid-phase polycondensation, which is a subsequent process, increases. If it exceeds 230 ° C, the temperature of the second stage will exceed 250 ° C, and fusion of polyester particles is likely to occur.
- the temperature of the second stage solid phase polycondensation is set to a temperature not less than 250 ° C, which is 15 ° C higher than the first stage solid phase polycondensation temperature. If it is less than 15 ° C, the effect of improving the solid phase polycondensation reaction rate of the first invention cannot be obtained.
- the increase in intrinsic viscosity in the first stage is 0.03 dLZg or more, preferably 0.05 dL / g or more. If it is less than 0.03dLZg, the effect of improving the solid phase polycondensation reaction rate in the second stage cannot be obtained sufficiently.
- the upper limit of the increase in intrinsic viscosity in the first stage should be set so that the overall heat treatment time is minimized and Z or the input heat quantity is minimized. It is about 30 dLZg, preferably about 0.1 OdLZg.
- the difference between the intrinsic viscosity of the polyester at the first stage solid phase polycondensation (first moving bed B) outlet and the intrinsic viscosity of the polyester at the second stage solid phase polycondensation (second moving bed D) is: Usually, it is preferably O.lOdLZg or less, more preferably 0.05 dLZg or less. If the difference in intrinsic viscosity is within this range, the effect of the first invention obtained by raising the temperature from the first stage solid phase polycondensation to the second stage solid phase polycondensation in a short time will be sufficiently exerted. More preferable.
- the temperature is preferably 250 ° C or lower. This is because the fusion of polymer particles in the second stage solid phase polycondensation occurs.
- the step of crystallizing the substantially amorphous polyester prepolymer in the first fluidized bed is performed before the first-stage solid phase polycondensation step. Crystallization can reduce the fusion of polyester particles in the subsequent solid phase polycondensation step.
- the temperature of the first fluidized bed is 100 to 200 ° C, preferably 150 to 190 ° C. If it is less than 100 ° C., it takes a long time to crystallize the prepolymer particles so that they do not fuse with each other, reducing the effect of the first invention. When the temperature exceeds 200 ° C, fusion between the pre-polymer particles tends to occur.
- the polyester obtained by the method of the first invention can be suitably used as a forming raw material for fibers, films, bottles and the like.
- a preform by injection molding or extrusion molding, it can be made into a bottle used for beverage packaging or the like by stretch blow molding. It can also be made into a bottle by direct blow molding.
- it can be formed into a film or sheet by extrusion molding or stretch molding and used for various applications such as packaging materials. Further, it can be made into a fiber by extrusion and stretch molding.
- the heat treatment apparatus of the first invention can be used as an apparatus for carrying out the method of the second, third or fourth invention.
- the method for producing a polyester of the second invention comprises a polyester prepolymer obtained by melt polycondensation under an inert gas atmosphere or under reduced pressure. , Heat treatment in a solid state, and proceed with polycondensation (solid phase polycondensation)
- solid phase polycondensation For efficient production of esters, low molecular weight prepolymers are used, subjected to solid state polycondensation at a relatively low temperature, and then heated to 15 ° C or more to obtain a polyester with a predetermined molecular weight at a relatively high temperature. It is characterized by performing solid-phase polycondensation until.
- a polyester prepolymer having an intrinsic viscosity of 0.18 dLZg or more and 0.40 dLZg or less is heat-treated in a solid state, and the intrinsic viscosity of the polyester prepolymer is 0.50 dL / g or more.
- a method for producing a polyester including a heat treatment to obtain a polyester by increasing the heat treatment, wherein the heat treatment is divided into n stages and a specific condition is satisfied.
- the heat treatment includes a drying step, a temperature raising step, a crystallization step, a solid phase polycondensation step and the like, and a polyester prepolymer in a solid state under a temperature condition exceeding normal temperature.
- the process to process.
- the polyester prepolymer used in the production method of the second invention can be produced, for example, using a method commonly used for producing a polyester prepolymer.
- the dicarboxylic acid and / or its ester-forming derivative and a diol are usually subjected to melt polycondensation using a polycondensation catalyst through an esterification reaction and Z or transesterification reaction.
- dicarboxylic acid and diol It is obtained after stirring and mixing into a slurry preparation tank to obtain a raw material slurry, which is subjected to an esterification reaction while distilling off water generated by the reaction in an esterification reaction tank under normal pressure to under pressure and under heating.
- the polyester low molecular weight substance (oligomer) as the ester ester reaction product is transferred to a polycondensation tank and subjected to melt polycondensation using a polycondensation catalyst under reduced pressure and heating to obtain a polyester.
- the catalyst used in the esterification or transesterification reaction and the catalyst used in the polycondensation reaction are not particularly limited, and can be appropriately selected from known catalysts.
- Specific examples of the catalyst used for the esterification or transesterification reaction include, for example, a tungsten compound and a titanium compound.
- Tungsten compounds include, for example, nortungstic acid, metatungstic acid, tungstic acid, key tungstic acid, lintungstic acid, and salts thereof. Particularly preferred are ammonium tungstate, sodium tungstate, and tungstic acid, particularly preferably ammonium metatungstate and ammonium noratungstate.
- the catalyst used in the polycondensation reaction include those exemplified in the production method of the first invention.
- the amount of the catalyst used is usually 1 to 400 ppm by mass with respect to the obtained polyester precursor.
- the titanium compound since the titanium compound also has an action as an esterification and / or ester exchange catalyst, it is preferable to use it in this range in consideration of the amount used when used in these reactions. .
- the amount used is preferably 1 to: LOOO mass ppm with respect to the polyester prepolymer obtained, and is particularly preferably 2 to 200 mass ppm.
- conversion of alkali metals and alkaline earth metals such as lithium acetate, sodium acetate, potassium acetate, magnesium acetate, magnesium hydroxide, magnesium alkoxide, magnesium carbonate, potassium hydroxide, calcium hydroxide, calcium acetate, calcium carbonate, etc.
- Compounds can also be used with the polycondensation catalyst.
- the amount to be used is usually 1 to 100 ppm by mass with respect to the obtained polyester prepolymer.
- the dicarboxylic acid component is an ester-forming derivative of dicarboxylic acid, such as terephthalate.
- dicarboxylic acid such as terephthalate
- an appropriate melting point such as dimethyl lurate, it can be melted without slurry with diol and subjected to transesterification reaction with diol.
- esterification reaction tank or transesterification reaction tank
- melt polycondensation reaction tank are each one stage. Or multiple stages.
- Polyester prepolymers that can be particularly preferably applied to the production method of the second invention include polyethylene terephthalate prepolymer and Z or polybutylene terephthalate prepolymer, which are usually dicarboxylic acids. It is a polyester prepolymer produced by using terephthalic acid and Z or dimethyl terephthalate as the main component, and ethylene glycol and / or 1,4 butanediol as the main component of the diol.
- the “main component” means that terephthalic acid accounts for 85 mol% or more, preferably 90 mol% or more, more preferably 95 mol% or more of the total dicarboxylic acid component, ethylene glycol, and Z or 1, 4 This means that butanediol accounts for 85 mol% or more, preferably 90 mol% or more, more preferably 95 mol% or more of the total diol component.
- the dicarboxylic acid component other than the terephthalic acid is the same as that used in the production method of the first invention.
- the diol components other than the ethylene glycol and 1,4 butanediol are the same as those used in the production method of the first invention.
- compounds having 3 or more functional groups for example, polycarboxylic acids such as trimellitic acid and pyromellitic acid and their anhydrides, and trimethylolmethane, trimethylolethane, trimethylolpropane, pentaerythritol,
- polycarboxylic acids such as trimellitic acid and pyromellitic acid and their anhydrides
- trimethylolmethane trimethylolethane
- trimethylolpropane trimethylolpropane
- pentaerythritol pentaerythritol
- polyols such as glycerol and hexanetriol
- hydroxycarboxylic acids such as malic acid and citrate
- the polyester obtained by the above-mentioned melt polycondensation reaction is connected to a melt polycondensation reaction tank with piping and
- the polyester prepolymer used in the production method of the second invention usually has an average particle size of preferably 0.5 mm or more and 3. Omm or less, more preferably 0.6 mm or more, and particularly preferably 0. 65 mm or more, while 2. Omm or less is more preferable, more preferably 1.8 mm or less, and particularly preferably 1.6 mm or less.
- the average particle size is less than 0.5 mm, the amount of fine powder increases when particles are formed, and troubles during transfer are likely to occur in the subsequent processes.
- the average particle size exceeds 3.0 mm, the required solid phase polycondensation reaction time becomes very long regardless of the effect of the second invention.
- Polyester prepolymers having an average particle diameter in the above range can be obtained, for example, by adjusting the die wheel diameter, the pre-polymer discharge amount and the strand take-up speed when the particles are made into particles by a strand cutter.
- the intrinsic viscosity of the polyester prepolymer used in the production method of the second invention is not less than 0.18 dL Zg and not more than 0.40 dLZg.
- the lower limit is preferably 0.20 dLZg or more.
- the upper limit is preferably 0.38 dLZg or less, particularly preferably 0.35 dLZg or less. If the intrinsic viscosity is less than 0.18 dLZg, fine powder is generated when it is made into particles, and the necessary solid phase polycondensation reaction time becomes very long even if the effect of the second invention is added. Absent. When the intrinsic viscosity exceeds 0.40 dLZg, expensive equipment for performing high-viscosity liquid stirring and high-vacuum reaction is required in the melt polycondensation step, and the effect of the second invention is diminished.
- a polyester prepolymer having an intrinsic viscosity within the above range can be obtained by controlling the polycondensation reaction temperature, time, and degree of vacuum.
- the terminal carboxyl group concentration of the polyester prepolymer used in the production method of the second invention is preferably 100 equivalents Z ton or less. More preferably, it is 70 equivalents Z ton or less, more preferably 40 equivalents Z ton or less, particularly preferably 20 equivalents Z ton or less. If it exceeds 100 tons, the polycondensation rate tends to decrease in the subsequent solid phase polycondensation.
- the terminal carboxyl group concentration (AV) is determined by dissolving the sample in a solvent and then adding sodium hydroxide. Measurement is possible by titration with hum.
- terminal carboxyl group concentration can be controlled by the temperature, pressure, mixing state of the esterification reaction step and Z or polycondensation reaction step, or the addition method of catalyst or ethylene glycol.
- the polyester preform obtained as described above is heat-treated in a solid state and polycondensed to a predetermined intrinsic viscosity by the production method of the second invention.
- the heat treatment in the production method of the second invention is divided into a plurality of steps (n stages) such as temperature increase, crystallization, solid phase polycondensation, and re-temperature increase.
- the heat treatment in the production method of the second invention can be carried out by a batch method, but it is preferred from the viewpoint of production efficiency to carry out the heat treatment continuously.
- the production method of the second invention is a method for producing a polyester comprising a heat treatment for obtaining a polyester by heat-treating the polyester prepolymer in a solid state to increase the intrinsic viscosity by 0.50 dLZg or more.
- the increase in intrinsic viscosity in the heat treatment is
- the increase amount of the intrinsic viscosity is usually 2.OOdLZg or less.
- the solid-phase polycondensation step of the heat treatment has at least two stages, the j-th stage and the k-th stage downstream from the j-th stage, the j-th stage temperature (Tj (° C)) and the k-th stage. There are at least one combination of the j-th stage and the k-th stage where the temperature of (Tk (° C)) satisfies (Equation la) Tj + 15 ⁇ Tk ⁇ 245. Furthermore, j and k are integers satisfying l ⁇ j ⁇ k ⁇ n, and n is an integer of 2 or more.
- the j-th stage temperature Tj is 190 ° C or higher and 230 ° C or lower, and the lower limit is preferably 200 ° C.
- the upper limit is preferably 220 ° C, more preferably 215 ° C.
- Tk as described above is expressed by (Equation la) Tj + 15 ° C ⁇ Tk ⁇ 245 ° C, but if Tk is less than Tj + 15 ° C, the solid phase weight of the second invention The effect of improving the condensation rate cannot be obtained.
- the increase in intrinsic viscosity in the j-th stage is 0.03 dL / g or more, preferably 0.05 d. LZg or more. If it is less than 0.03dLZg, the effect of improving the solid phase polycondensation rate in the k-th stage cannot be obtained sufficiently.
- the upper limit of the increase in intrinsic viscosity in the j-th stage should be set so that the time for the entire heat treatment is minimized and Z or the amount of input heat is minimized, usually 0.30 dLZg or less, preferably 0 It is about 25 dLZg or less, more preferably about 0.20 dLZg or less.
- the difference between the intrinsic viscosity of the polyester at the end of the j-th stage and the intrinsic viscosity of the polyester at the start of the k-th stage is O.lOdLZg or less, preferably 0.05 dLZg or less. 0.
- 10d LZg the power at the end of the j-th stage is increased, and as a result of the heat treatment time until the start of the k-th stage, the second power obtained by raising the temperature to the j-th stage in the k-th stage in a short time.
- the effect of the invention is not achieved, which is not preferable.
- the jth stage and the Z or kth are carried out on a moving bed, in particular a continuous moving bed.
- the Tha (° C) preferably satisfies (Equation 3a) Tk ⁇ Tha ⁇ 250 ° C.
- Tk Tk ⁇ Tha ⁇ 250 ° C.
- the residence time of the h-th stage should be set so that the difference between the intrinsic viscosity of the polyester at the end of the j-th stage and the intrinsic viscosity of the polyester at the start of the k-th stage is less than O.lOdLZg, usually 90 minutes Within 60 minutes, preferably within 60 minutes, more preferably within 40 minutes.
- the h-th stage is not particularly limited as long as it is a facility capable of heating and heating the polyester particles, and it is preferable that the fusion of the particles is small when performed in a fluidized bed using an inert gas.
- a c-th stage crystallization process
- crystallizing at least a part of the substantially amorphous polyester prepolymer it is possible to reduce fusion between the polyester particles in the j-th stage, the k-th stage, and the like thereafter.
- the temperature Tea (° C) in the c-th stage preferably satisfies 100 ⁇ Tca ⁇ 200 ° C.
- the c-th stage is not particularly limited as long as it is a facility capable of heating the polyester polymer particles, and is preferably performed in a fluidized bed using an inert gas so that the particles are less fused.
- the polyester prepolymer particles may be dried in the c-th stage.
- the polyester prepolymer particles may be dried at the beginning of the solid phase polycondensation.
- the first heat treatment crystallizes at least a part of the polyester prepolymer in a substantially amorphous state at a temperature Tla (° C), and the crystallized polyester polymer is converted to a temperature T2a (° C).
- Solid phase polycondensation in 2nd stage, 2nd stage product raised to temperature T3a (° C) 3rd stage, 3rd stage product obtained at temperature T4a (° C) It includes all the 4th stage of solid phase polycondensation in this order, and the increase in intrinsic viscosity in the 2nd stage is 0.03dLZg or more, and the intrinsic viscosity at the end of the 2nd stage and the intrinsic viscosity at the start of the 4th stage. It is preferable that the difference is 0.1 lOdLZg or less, and Tla, T2a, T3a, and T4a (° C) satisfy the following (formula 4a) to (formula 7a).
- the polyester obtained by the production method of the second invention can be suitably used as a forming raw material for fibers, films, bottles and the like.
- a preform by injection molding or extrusion molding, it can be made into a bottle used for beverage packaging or the like by stretch blow molding.
- the bottle can be made by direct blow molding.
- it can be formed into a film or sheet by extrusion molding or stretch molding and used for various applications such as packaging materials. Further, it can be made into a fiber by extrusion and stretch molding.
- the PET production method of the third invention (hereinafter also referred to as “production method of the third invention”) is a melting method.
- the PET polymer particles obtained by polycondensation are heat-treated in an inert gas atmosphere or under reduced pressure, that is, polycondensation (solid phase polycondensation) in the solid state is advanced to achieve the desired high molecular weight PET suitable for molding.
- polycondensation solid phase polycondensation
- the heat treatment in the production method of the third invention includes a drying step, a temperature raising step, a crystallization step, a solid phase polycondensation step, etc., and the solid state PET preform is treated under temperature conditions exceeding room temperature.
- intrinsic viscosity is used as an index of molecular weight of PET.
- the method for obtaining the PET prepolymer used in the production method of the third invention is not particularly limited,
- a dicarboxylic acid component mainly composed of terephthalic acid and Z or an ester-forming derivative thereof and a diol component mainly composed of ethylene glycol are used, and if necessary, the esterification catalyst or the ester exchange catalyst. It is produced by conducting esterification reaction and Z or transesterification reaction in the presence, and then melt polycondensation using a polycondensation catalyst.
- the raw material dicarboxylic acid component and diol component are charged into a slurry preparation tank, stirred and mixed to form a raw material slurry, and subjected to a reaction under normal pressure to pressure and under heating in an esterification reaction tank.
- the esterification reaction is carried out, and then the resulting PET low molecular weight (oligomer) as the esterification reaction product is transferred to a polycondensation tank, and the polycondensation catalyst is heated under reduced pressure. Is used for melt polycondensation to obtain PET.
- terephthalic acid as a main component means that 90 mol% or more, preferably 95 mol% or more is terephthalic acid based on all dicarboxylic acid components used for producing PET. ⁇ or Z or its ester-forming derivative
- the main component of lenglycol means that ethylene glycol is 90% or more, preferably 95 mol% or more, based on all diol components used to produce PET.
- the dicarboxylic acid component other than the terephthalic acid is the same as that used in the production method of the first invention.
- the diol component other than ethylene glycol is the same as that used in the production method of the first invention.
- the catalyst used in the esterification or transesterification reaction and the catalyst used in the polycondensation reaction are not particularly limited, and can be appropriately selected from known catalysts. Specific examples include those exemplified in the production methods of the first and second inventions.
- the amount of the catalyst used is usually 1 to 400 ppm by mass with respect to the obtained PET prepolymer.
- the titanium compound since the titanium compound also has an action as an esterification and / or transesterification catalyst, it is preferably used within this range in consideration of the amount used when used in these reactions.
- the amount used is preferably 1 to L000 mass ppm with respect to the obtained PET prepolymer, and more preferably 2 to 200 mass ppm.
- alkali metals and alkaline earth metals such as lithium acetate, sodium acetate, potassium acetate, magnesium acetate, magnesium hydroxide, magnesium alkoxide, magnesium carbonate, potassium hydroxide, calcium hydroxide, calcium acetate, calcium carbonate, etc.
- Compounds can also be used with the polycondensation catalyst.
- the amount to be used is usually 1 to L00 mass ppm with respect to the obtained PET prepolymer.
- Specific production conditions for the PET prepolymer used in the production method of the third invention are, for example, dicarboxylic acid mainly composed of terephthalic acid and Z or an ester-forming derivative thereof and diol mainly composed of ethylene glycol.
- dicarboxylic acid mainly composed of terephthalic acid and Z or an ester-forming derivative thereof
- diol mainly composed of ethylene glycol.
- the resulting product (PET low molecular weight) was subjected to esterification reaction for about 1 to 10 hours at a temperature, usually from normal pressure to about 0.4 MPa, or in the presence of a transesterification catalyst.
- Body in the polycondensation reaction tank It can be produced by a method such as transfer and then melt polycondensation.
- Melt polycondensation usually uses a polycondensation catalyst, usually at a temperature of about 250 to 290 ° C, with normal pressure gradually reduced, and finally under a reduced pressure of about 10 to 0.1 lkPa, with stirring and intrinsic viscosity. From 0.18dL / g to 0.4
- the dicarboxylic acid component is an ester-forming derivative of dicarboxylic acid, such as dimethyl terephthalate, having an appropriate melting point, it is melted without slurry with diol and transesterified with diol. It can also be used for the reaction.
- dicarboxylic acid component is an ester-forming derivative of dicarboxylic acid, such as dimethyl terephthalate, having an appropriate melting point, it is melted without slurry with diol and transesterified with diol. It can also be used for the reaction.
- the above reaction can be carried out by any one or more of continuous, batch, and semi-batch methods, and the esterification reaction tank (or transesterification reaction tank) and the melt polycondensation reaction tank are
- Each may be a single stage or multiple stages.
- the PET prepolymer obtained by the melt polycondensation reaction is connected to the melt polycondensation reaction tank with piping and
- PET discharged in a strand form is cut into pellets by cutting with a strand cutter, for example.
- the PET polymer particles obtained by the melt polycondensation reaction used in the production method of the third invention usually have an average particle size of 0.5 to 3. Omm, and the lower limit is more preferably 0.6 mm. Particularly preferred is 0.65 mm, while the upper limit is more preferably 2. Omm, more preferably 1.8 mm, particularly preferably 1.6 mm. If the average particle size is less than 0.5 mm, fine particles increase when particles are formed, and troubles during transfer are likely to occur in subsequent processes. If the average particle size exceeds 3.0 mm, the solid phase polycondensation reaction time required to reach the desired molecular weight tends to be longer regardless of the effect of the third invention.
- an integrated distribution curve is created by the dry sieving test method described in the average particle diameter of particles ⁇ and ISK0069, and the value at which the integrated percentage reaches 50% is defined as the average particle diameter.
- the intrinsic viscosity of the PET prepolymer used in the production method of the third invention is 0.18 to 0.4 OdLZg.
- the lower limit of the intrinsic viscosity is preferably 0.20 dLZg, and the upper limit is preferably 0.38 dLZg, particularly preferably 0.35 dLZg. If the intrinsic viscosity of the prepolymer is less than the lower limit, fine powder is easily generated when it is granulated. Is not preferable because the solid phase polycondensation reaction time required to reach the desired high molecular weight becomes very long.
- the upper limit is exceeded, even if the prepolymer has a relatively high intrinsic viscosity, the effect of shortening the reaction time for obtaining a high molecular weight PET is not obtained, and in addition, a high viscosity liquid in the melt polycondensation process is not obtained. Expensive equipment for stirring and high-vacuum reaction is required, and the effect of the third invention is reduced as a whole of the manufacturing process.
- the terminal carboxyl group concentration of the PET prepolymer used in the production method of the third invention is preferably 100 equivalents or less Z tons. More preferably, it is 70 equivalents Z ton or less, more preferably 40 equivalents Z ton or less, particularly preferably 20 equivalents Z ton or less. When it exceeds 100 equivalents of Z ton, the polycondensation reaction rate tends to decrease in the subsequent solid phase polycondensation.
- the PET prepolymer particles obtained as described above are heat-treated in a solid state and solid-phase polycondensed to a predetermined intrinsic viscosity by the production method of the third invention.
- the heat treatment of the third invention mainly includes a stepwise solid phase polycondensation step and a temperature raising step, but these steps can be performed by a batch method, but it is preferable from the viewpoint of production efficiency that they are continuously performed.
- the intrinsic viscosity of PET obtained by the production method of the third invention is 0.70 dLZg or more. When PET less than 0.70d LZg is produced, the effect of the third invention that the solid-phase polycondensation reaction rate can be increased as compared with the conventional method is not preferable, which is not preferable.
- the heat treatment of the third invention includes at least the following two steps in this order: a first-stage solid phase polycondensation step and a second-stage solid phase polycondensation step.
- the PET prepolymer is heat-treated at a temperature (Tlb) of 200 ° C or more and 225 ° C or less, in an inert gas atmosphere or under reduced pressure, and an average residence time of 0.5 hours or more and 10 hours or less.
- Tlb temperature of 200 ° C or more and 225 ° C or less
- Pre-polymers that have undergone the first stage solid phase polycondensation process are heat-treated at a temperature (T2b) of 215 ° C or higher and 240 ° C or lower under an inert gas atmosphere or under reduced pressure with an average residence time of 2 hours or longer.
- first stage and second stage solid phase polycondensation steps are carried out under an inert gas atmosphere or under reduced pressure.
- inert gas refers to an oxygen concentration of 0.1 vol% or less, The gas is preferably 0.05% by volume or less and does not substantially react with polyester (PET). Specific examples of the gas that does not substantially react with polyester include nitrogen, helium, neon, argon, xenon, carbon dioxide and the like, and nitrogen is preferably used mainly from the viewpoint of economy. .
- Under reduced pressure means that the absolute pressure is 2 kPa or less.
- the temperature (Tib) in the first-stage solid phase polycondensation step is 200 ° C or higher and 225 ° C or lower, and the lower limit is preferably 205 ° C.
- the upper limit is preferably 222 ° C, more preferably 220 ° C. If it is less than 200 ° C., the polycondensation reaction rate in the first stage step becomes small, and the load in the subsequent second stage becomes large. If the temperature exceeds 225 ° C, the temperature (T2b) of the second stage solid phase polycondensation process exceeds the upper limit of 240 ° C, which is disadvantageous in that PET particles are likely to be fused.
- T2b must satisfy Tlb + 15 ° C ⁇ T2b (formula lb). If T2b is less than T lb + 15 ° C, the solid phase polycondensation reaction rate of the third invention is improved. The effect may not be obtained.
- the average residence time in the first-stage solid phase polycondensation step is usually 0.5 hours or more and 10 hours or less, although it depends on the temperature, and the lower limit is preferably 1.0 hour.
- the upper limit is preferably 9 hours, more preferably 8 hours. If the time is less than 5 hours, the increase in intrinsic viscosity in the first stage process becomes smaller and the load on the second stage process becomes larger. If it exceeds 5 hours, the solid-phase polycondensation reaction rate in the latter half of the first stage process becomes small, which is not efficient.
- the increase in intrinsic viscosity in the first-stage solid phase polycondensation step is 0.03 dLZg or more, and preferably 0.05 dLZg or more. If it is less than 0.03dLZg, the effect of improving the solid phase polycondensation reaction rate in the second step cannot be obtained sufficiently.
- the upper limit of the increase in intrinsic viscosity in the first stage is usually about 0.30 dLZg, as long as the time of the entire heat treatment is minimized and Z or the amount of heat input is minimized. is there.
- the temperature (T2b) of the second-stage solid phase polycondensation step is 215 ° C or higher and 240 ° C or lower, and the lower limit is preferably 220 ° C.
- the upper limit is preferably 237 ° C, more preferably 235 ° C. twenty one If it is less than 5 ° C, it takes a long time to reach the target degree of polymerization, which is not preferable. If it exceeds 240 ° C, it is inconvenient because PET particles are likely to be fused.
- the average residence time in the second-stage solid phase polycondensation step is 2 hours or more, preferably 4 hours or more, and usually 36 hours or less. If it is less than 2 hours, the increase in intrinsic viscosity in the second stage process becomes small, and the load in the first stage process becomes large in order to obtain PET with the desired degree of polymerization.
- the first stage solid phase polycondensation step and the second stage solid phase polycondensation step of the production method of the third invention are particularly preferably a continuous moving bed which is preferably carried out continuously.
- the first stage in order to prevent fusion of PET particles during the transition from the first stage solid phase polycondensation step to the second stage solid phase polycondensation step, the first stage It is preferable to provide a temperature raising step between the step and the second step.
- the temperature (Thb) condition in the temperature raising step is preferably Tib or more and 250 ° C or less, and more preferably T2b or more and 250 ° C or less. By setting the Thb within this range, the polymer particles can be fused in the second stage solid phase polycondensation step.
- the PET particles that have undergone the heat treatment in the first step in the meantime are processed for a short time at a temperature that is more than the Thb force b.
- the PET inherent viscosity slightly increases and some crystal structure changes, which increase the reaction rate of the solid phase polycondensation in the second stage process. It is presumed that it has a positive effect and is effective in preventing fusion in the second stage solid phase polycondensation process.
- the residence time in the temperature raising step is usually 30 minutes or less, preferably 25 minutes or less, and more preferably 20 minutes or less. If the residence time of the temperature raising step is within this range, it is preferable because the equipment used for the temperature raising step can be reduced in size.
- the equipment used for the temperature raising process is not particularly limited as long as it can heat and raise the PET particles, and a fluidized bed using an inert gas is preferred because there is little fusion between the particles.
- a crystallization step of crystallizing at least a part of the substantially amorphous PET prepolymer Prior to the first-stage solid phase polycondensation step of the heat treatment of the third invention, it is preferable to provide a crystallization step of crystallizing at least a part of the substantially amorphous PET prepolymer.
- Crystallization is a force performed by heat-treating PET prepolymers
- Temperature of the crystallization process (Tc) U is preferred to be 140 ° C or more and 200 ° C or less.
- the residence time is usually 90 minutes or less, preferably 60 minutes or less.
- the crystallization step crystallization of the PET prepolymer proceeds, and the ultimate crystallinity is usually about 30 to 60% by weight.
- the crystallization process is not particularly limited as long as it is a facility capable of heating PET particles, and is preferably performed in a fluidized bed using an inert gas because the particles are less fused.
- a step of raising the temperature to Tcb can be provided before the crystallization step, or the temperature can be raised and crystallized in the crystallization step!
- the prepolymer may be dried in the crystallization process. Further, the drying of the prepolymer may be performed at the beginning of the first stage solid phase polycondensation step
- PET obtained by the production method of the third invention can be suitably used for molding raw materials such as fibers, films, and bottles.
- raw materials such as fibers, films, and bottles.
- it after forming a preform by injection molding or extrusion molding, it can be made into a bottle used for beverage packaging or the like by stretch blow molding. It can also be made into a bottle by direct blow molding.
- production method of the fourth invention An embodiment of the PET production method of the fourth invention (hereinafter also referred to as “production method of the fourth invention”) will be described in detail.
- the heat treatment in the fourth invention means a step of treating a solid PET prepolymer under a temperature condition exceeding room temperature, including a drying step, a temperature raising step, a crystallization step, a solid phase polycondensation step and the like. .
- intrinsic viscosity is used as an index of molecular weight of PET.
- the method for obtaining the PET prepolymer used in the production method of the fourth invention is not particularly limited, and for example, it can be produced by a conventional method for producing PET. Specifically, usually, a dicarboxylic acid component mainly composed of terephthalic acid and Z or an ester-forming derivative thereof and a diol component mainly composed of ethylene glycol, and if necessary, an ester exchange catalyst or an ester exchange catalyst. Perform esterification reaction and Z or transesterification reaction in the presence of And is produced by melt polycondensation using a polycondensation catalyst.
- the raw material dicarboxylic acid component and the diol component are put into a slurry preparation tank and stirred and mixed to form a raw material slurry, which is generated by a reaction in an esterification reaction tank under normal pressure to pressure and under heating.
- the obtained PET low molecular weight (oligomer) as an esterification reaction product is transferred to a polycondensation tank, and the polycondensation catalyst is used under reduced pressure and heating.
- a method of obtaining a PET prepolymer by melt polycondensation is a method of obtaining a PET prepolymer by melt polycondensation.
- terephthalic acid is the main component. More than 90 mol%, preferably 95 mol% or more of terephthalic acid and Z are used with respect to all dicarboxylic acid components used to produce PET. Or an ester-forming derivative thereof, and that ethylene glycol is the main component is that ethylene glycol is 90 mol% or more, preferably 95 mol%, based on all diol components used to produce PET.
- the dicarboxylic acid component other than the terephthalic acid is the same as that used in the production method of the first invention.
- the diol component other than ethylene glycol is the same as that used in the production method of the first invention.
- the catalyst used in the esterification or transesterification reaction and the catalyst used in the polycondensation reaction are not particularly limited, and can be appropriately selected from known catalysts. Specific examples include those exemplified in the production methods of the first and second inventions.
- the amount of the catalyst used is usually 1 to 400 ppm by mass with respect to the obtained PET prepolymer.
- the titanium compound since the titanium compound also has an action as an esterification and / or transesterification catalyst, it is preferably used within this range in consideration of the amount used when used in these reactions.
- the amount used is preferably 1 to L000 mass ppm with respect to the obtained PET prepolymer, and more preferably 2 to 200 mass ppm.
- lithium acetate, sodium acetate, potassium acetate, magnesium acetate, magnesium hydroxide, magnesium alkoxide, magnesium carbonate, potassium hydroxide, calcium hydroxide Compounds of alkali metals and alkaline earth metals such as shim, calcium acetate and calcium carbonate can also be used with the polycondensation catalyst.
- the amount used is usually 1 to: LOO mass ppm with respect to the obtained PET prepolymer.
- Dicarboxylic acid based on terephthalic acid and Z or its ester-forming derivatives, and diols based on ethylene glycol are usually used in a dicarboxylic acid component: glycol component of 1: 1 to 1: 2 (molar ratio).
- esterification reaction tank If necessary in the esterification reaction tank, it is usually in the presence of an esterification catalyst, at a temperature of about 240 to 280 ° C, usually at a pressure of about 0.4 MPa at a relative pressure with respect to normal pressure to atmospheric pressure, 1 ⁇ : Transesterification in the presence of esterification reaction for about LO time or in the presence of a transesterification catalyst, and the resulting product (PET low molecular weight polymer) is transferred to a polycondensation reaction tank and then melted. Condensate.
- an esterification catalyst at a temperature of about 240 to 280 ° C, usually at a pressure of about 0.4 MPa at a relative pressure with respect to normal pressure to atmospheric pressure
- melt polycondensation In melt polycondensation, a polycondensation catalyst is used, usually at a temperature of about 250 to 290 ° C, gradually from normal pressure to gradually reduced pressure, and finally at a normal absolute pressure of about 10 to 0.1 lkPa, with stirring. As described later, melt polycondensation is performed until the intrinsic viscosity becomes 0.18 dL / g to 0.40 dL / g.
- the dicarboxylic acid component is an ester-forming derivative of dicarboxylic acid, such as dimethyl terephthalate, having an appropriate melting point, it is melted without slurrying with the diol and subjected to a transesterification reaction with the diol.
- the above reaction can be carried out by any one or more of continuous, batch, and semi-batch methods, and the esterification reaction tank (or transesterification reaction tank) and the melt polycondensation reaction tank are respectively It can be single or multistage.
- the PET prepolymer obtained by the melt polycondensation reaction is supplied to a die head connected to the melt polycondensation reaction tank through a pipe and Z or a gear pump and Z or a filter. From the die hole, it is discharged in the form of strands or drops.
- the PET pellets discharged in the form of strands are cut into pellets by cutting with a strand cutter, for example.
- the PET prepolymer particles obtained by the melt polycondensation reaction used in the production method of the fourth invention preferably have an average mass of 0.1 to 30 mgZ particles, and the lower limit is 0.5 mgZ particles. Particularly preferred is 0.8 mgZ grains, while the upper limit is 10 mgZ grains, more preferably 5 mgZ grains, particularly preferably 3 mgZ grains.
- the average mass of the PET prepolymer particles used in the production method of the fourth invention is not less than the above lower limit, troubles are unlikely to occur during subsequent processes and pneumatic transportation, and when the average mass is not more than the above upper limit, Since the solid phase polycondensation reaction time required to reach the desired molecular weight can be shortened, each is more preferable.
- the average mass of PET prepolymer is calculated by measuring the total mass of 30 PET prepolymer particles to the order of 0.1 mg and dividing the measured value by 30 using a precision balance. Means the value.
- the intrinsic viscosity of the PET prepolymer used in the production method of the fourth invention is 0.18 to 0.4 OdLZg.
- the lower limit of the intrinsic viscosity is preferably 0.20 dLZg, and the upper limit is preferably 0.38 dLZg, particularly preferably 0.35 dLZg. If the prepolymer has an intrinsic viscosity of less than the above lower limit value, fine powder is generated when it is made into particles, and the solid phase polycondensation reaction time required to reach the desired high molecular weight becomes very long. It is not preferable.
- the terminal carboxyl group concentration of the PET prepolymer used in the production method of the fourth invention is preferably 100 equivalents or less Z tons.
- the terminal carboxyl group concentration is more preferably 70 equivalents Z ton or less, still more preferably 40 equivalents Z ton or less, and particularly preferably 20 equivalents Z ton or less.
- the terminal carboxyl group concentration of the PET prepolymer exceeds 100 equivalents / ton, the polycondensation reaction rate tends to decrease in the subsequent solid-phase polycondensation
- the PET prepolymer particles obtained as described above are heat-treated in a solid state and solid-phase polycondensed to a predetermined intrinsic viscosity by the production method of the fourth invention.
- the heat treatment of the production method of the fourth invention mainly includes a stepwise solid phase polycondensation step and a temperature raising step. Although these processes can be performed by a batch method, it is preferable in terms of production efficiency to perform them continuously.
- the intrinsic viscosity of PET obtained by the production method of the fourth invention is 0.70 dLZg or more . In the case of producing PET of less than 0.70 dLZg, the effect of the fourth invention that the solid phase polycondensation reaction rate can be increased as compared with the conventional method is not sufficiently exhibited, which is not preferable.
- the heat treatment of the production method of the fourth invention includes at least the following first-stage solid phase polycondensation step, heating step, and second-stage solid phase polycondensation step in this order.
- the PET prepolymer that has undergone the first-stage solid phase polycondensation process is heated from the temperature of the heat treatment (Tic) or lower in the first-stage solid-phase polycondensation process in an inert gas atmosphere or under reduced pressure. This is a process to raise the temperature (T2c) from Tic (° C) to (Tic + 15) ° C within 30 minutes, and Tic (° C) and T2c (° C) Wherein (Formula lc) and (Formula 2c) are satisfied.
- the temperature raising step, the first stage, and the second stage solid phase polycondensation process are performed under an inert gas atmosphere or under reduced pressure.
- the "inert gas” refers to an oxygen concentration of 0.1.
- Specific examples of the gas that does not substantially react with the polyester include nitrogen, helium, neon, argon, xenon, carbon dioxide, and the like. Nitrogen is also preferably used mainly for economic reasons.
- “Under reduced pressure” means that the absolute pressure is 2 kPa or less.
- the temperature (Tic) of the first-stage solid phase polycondensation step is 190 ° C or higher and 225 ° C or lower, and the lower limit is preferably 200 ° C, more preferably 205 ° C.
- the upper limit of Tic is preferably 220 ° C. If Tic is less than 190 ° C, the polycondensation reaction rate in the first step is reduced, and the load on the subsequent second step is increased, which is not preferable. If Tic exceeds 225 ° C, the temperature (T2c) in the temperature raising process exceeds the upper limit of 240 ° C as described later, which is inconvenient in that PET particles are easily fused.
- Tic and T2c must satisfy Tlc + 15 ° C ⁇ T2c (formula lc) in the heating step after the first-stage solid-phase polycondensation in the production method of the fourth invention. It is necessary to raise the temperature within 30 minutes at least 15 ° C or longer. That is, Tic is 190 ° C or more and 225 ° C or less, and T lc and T2c satisfy (Equation lc). As a result, T2c satisfies the following (Equation 2c).
- the temperature (T3c) of the second stage solid phase polycondensation step is 190 ° C or higher and 240 ° C or lower, and the lower limit of T3c is preferably 210 ° C, more preferably 220 ° C.
- the upper limit of T3c is preferably 237. C, more preferably 235 ° C. If T3c is less than 190 ° C, it will take a long time to reach the target degree of polymerization. When T3c exceeds 240 ° C, PET particles It is inconvenient because it is easy to cause fusion. Even when T3c is lower than the temperature (T2c) of the temperature raising step, the effect of the high solid phase polycondensation rate of the fourth invention is exhibited.
- the average residence time of the first-stage solid phase polycondensation step is usually 0.5 hours or more and 10 hours or less, although it depends on the temperature Tic, and the lower limit is preferably 1.0 hour.
- the upper limit is preferably 9 hours, more preferably 8 hours. If the average residence time in the first stage solid phase polycondensation process is 0.5 hours or more, the increase in intrinsic viscosity in the first stage solid phase polycondensation process will increase, and the load on the second stage solid phase polycondensation process will increase. It is reduced.
- the average residence time of the first stage solid phase polycondensation process is 10 hours or less, the decrease in the solid phase polycondensation reaction rate in the latter half of the first stage solid phase polycondensation process is slight, and each is efficient. It is more preferable.
- the increase in intrinsic viscosity in the first stage solid phase polycondensation process that is, the difference in intrinsic viscosity of PET before and after the first stage solid phase polycondensation process is usually 0.03 dLZg or more, preferably 0. It is more than 05dL / g. If this value is 0.03 dLZg or more, the effect of improving the solid-phase polycondensation reaction rate in the second-stage solid-phase polycondensation step can be obtained and it is more preferable.
- the upper limit of the increase in intrinsic viscosity in the first stage solid phase polycondensation process is usually set so as to satisfy that the time for the entire heat treatment is minimized and that Z or the input heat amount is minimized. It is about 30dL / g.
- the residence time in the temperature raising step is usually 60 minutes or less, preferably 40 minutes or less, more preferably 30 minutes or less.
- the residence time in the temperature raising step is within this range, the solid phase polycondensation rate is large, and in addition to the effect of the temperature raising step, the equipment used in the temperature raising step can be reduced in size.
- the equipment used for the temperature raising process is not particularly limited as long as it is equipment capable of heating and heating PET particles, and a fluidized bed using an inert gas is usually preferable because the particles are fused with each other with less particle crushing. Used.
- the prebolimer that is subjected to the second solid phase polycondensation step after the temperature raising step preferably has an intrinsic viscosity of 0.35 dLZg or more, more preferably 0.40 dLZg or more, and even more preferably. Is 0.43 dLZg or more, particularly preferably 0.45 dLZg or more.
- the intrinsic viscosity of the prepolymer that has undergone the temperature raising step is within this range, the solid phase polycondensation reaction rate in the second stage solid phase polycondensation step of the production method of the fourth invention is increased, and particularly under load. Since there exists a tendency which can suppress the heat fusion of PET which has a copolymerization component, it is still more preferable.
- the difference between the intrinsic viscosity of the polymer used in the second-stage solid-phase polycondensation process after the temperature process and the intrinsic viscosity of the polyester obtained through the second-stage solid-phase polycondensation process is usually 0.10 d LZg or more Preferably, it is 0.20 dLZg or more.
- the average residence time in the second-stage solid phase polycondensation step is usually 2 hours or more and 50 hours or less, depending on the temperature, and the lower limit is preferably 4 hours or more.
- the average residence time is within this range, the intrinsic viscosity increase value in the second-stage solid phase polycondensation step is increased, and a PET having a desired degree of polymerization can be efficiently obtained.
- the first stage solid phase polycondensation step and the second stage solid phase polycondensation step of the fourth invention are preferably performed continuously from the viewpoint of production efficiency, reaction control, operability, and the like.
- a continuous moving bed is particularly preferably used.
- a crystallization step of crystallizing at least a part of the substantially amorphous PET prepolymer Prior to the first solid phase polycondensation step of the heat treatment of the fourth invention, it is preferable to provide a crystallization step of crystallizing at least a part of the substantially amorphous PET prepolymer.
- Crystallization is a force performed by heat-treating the PET prepolymer.
- the temperature (Tx) of the crystallization process is usually 110 ° C or higher and 200 ° C or lower, preferably the lower limit is 140 ° C or higher, more preferably the lower limit. Is over 160 ° C.
- the temperature (Tx) in the crystallization step is within this range, it is more preferable because the prepolymer particles are difficult to fuse with each other and reach a sufficient crystallinity in a relatively short time. In addition, it is more preferable because it tends to be difficult to fuse in subsequent processes.
- the crystallization step it is preferable to proceed with the crystallization of the PET prepolymer to obtain a PET prepolymer having a crystallinity of about 30 to 60% by mass.
- the crystallization step is not particularly limited as long as it is a facility capable of heating PET particles, but it is preferable to perform fusion in a fluidized bed using an inert gas because the particles are less fused.
- a step of raising the temperature of the PET prepolymer to Tx may be provided, and the temperature rise and crystallization may be performed in the crystallization step. Further, the prepolymer may be dried in the crystallization step. The prepolymer may be dried at the beginning of the first stage solid phase polycondensation step. [0162] After the second stage solid phase polycondensation step of the heat treatment of the fourth invention, a second stage temperature rising step and a third stage solid phase polycondensation step may be further provided.
- the temperature (T3c) in the second stage solid phase polycondensation process is 190 ° C or higher and 225 ° C or lower
- the temperature (T4c) in the second stage temperature rising process is 15 ° C or higher than T3c (° C). It is preferably 240 ° C or lower and the temperature (T5c) in the third stage solid phase polycondensation step is 205 ° C or higher and 240 ° C or lower.
- the second stage temperature raising step is a step in which the temperature rise starts from a temperature of T3c (° C) or lower and then rises to the temperature (T4c). From the temperature T2c (° C) to (T2c + 15) It is preferable to raise the temperature to ° C within 30 minutes.
- the solid phase polycondensation step and the temperature raising step may be alternately repeated three times or more.
- the method of alternately repeating the relatively low temperature solid-phase polycondensation step and the temperature raising step of raising the temperature to a relatively high temperature in a short time is particularly fused due to a large amount of copolymerization.
- solid phase polycondensation of easy PET T prepolymers there is a tendency to suppress fusion when the solid phase polycondensation process is carried out on a moving bed, and it occurs due to long-term solid phase polycondensation Since it tends to be able to suppress the inertness of some of the end groups, the overall heat treatment time tends to be shortened, which is more preferable.
- the measurement principle of the above-mentioned fully automatic solution viscometer is to compare the drop time when a unit volume of the solution falls in the first column (capillary) with the drop time in the case of the solvent alone.
- the total mass of 30 PET prepolymer particles was measured to the order of 0.1 mg, and the average value per particle was calculated by dividing the measured value by 30.
- a cumulative distribution curve is created by the dry screening test method described in JIS K0069, and the value at which the cumulative percentage reaches 50% is taken as the average particle size.
- A is the amount required for the titration of 0.1N sodium benzil alcohol solution L) and B is the amount required for the titration with a blank.
- W is the amount of polyester resin sample (g)
- f is the titer of 0.1N sodium hydroxide in benzyl alcohol solution.
- the titer (f) of 0.1N sodium benzyl alcohol solution of 0.1N was obtained by collecting 5mL of methanol in a test tube and adding 1-2 drops of phenol red ethanol solution as an indicator.
- the density d of the sample was measured using a dry automatic density measuring apparatus (Accum yc 1330 manufactured by Shimadzu Corporation) at a measurement temperature of 23 ° C., precisely weighing 6 to 8 g of the sample in a measurement cell.
- a dry automatic density measuring apparatus Accel yc 1330 manufactured by Shimadzu Corporation
- Sample PET particles 5 Add 50 ml of 4N potassium hydroxide Z methanol solution to OOg, set a reflux condenser, and stir on a hot plate with a magnetic stirrer (surface temperature 200 ° C). Heat to reflux for 2 hours to hydrolyze. After standing to cool, add about 20 g of high-purity terephthalic acid, neutralize by shaking well, and filter the slurry with a pH of 9 or less using a glass filter (11G-4), then with 2 ml of methanol. Wash twice and combine the filtrate and washings to make the test solution for gas chromatography.
- A Area of diethylene glycol component (/zV.sec)
- a slurry preparation tank having an agitator, an ethylene glycol charging pipe and a terephthalic acid charging pipe; a pipe for transferring the slurry to the first esterification reaction tank; an agitator, a separation tower, Completely mixed first and second esterification reaction tanks with raw material inlet, catalyst charging pipe, reactant transfer pipe; pipe for transferring esterification reaction product (oligomer) to melt polycondensation reaction tank; stirrer, separation Completely mixed first melt polycondensation reaction tank having a tower, an oligomer inlet, and a catalyst charging pipe; a plug flow type second and third melt polycondensation having a stirrer, a separation tower, a polymer inlet, and a polymer outlet Reactor; A polymerizer is drawn out from the die plate through a gear pump through a gear pump to form a strand, and a strand force is applied under water cooling (strand cutter is a pelletizer manufactured by Reuters Automatic (
- Polyester continuous production equipment equipped with P—USG100) was used.
- the concentration of phosphorus in the resulting polyester is ethylene glycol solution of orthophosphoric acid such as a 2 2 mass ppm as a phosphorus atom (concentration: 0.50 mass 0/0 as a phosphorus atom) was added A slurry of terephthalic acid / ethylene glycol (molar ratio 1: 1.5) was prepared.
- 400 parts by mass of bis (betahydroxyethyl) terephthalate is charged into the first esterification reactor and melted in a nitrogen atmosphere.
- the temperature is 262 ° C and the pressure is 96 kPaG (hereinafter G is relative pressure to atmospheric pressure).
- the slurry prepared in the slurry preparation tank is continuously charged so that the average residence time as polyester is 4.5 hours at 135 parts by mass Z time.
- the esterification reaction was carried out while distilling off the water to be separated, the reaction solution was continuously transferred to the second esterification reaction tank.
- the temperature is 260 ° C
- the pressure is 5 kPaG
- the residence time is 1.5 hours
- the concentration of antimony in the resulting polyester prepolymer is 18 3 mass ppm as antimony atoms.
- an ethylene glycol solution of antimony concentration: 1.8% by mass as the concentration of antimony atoms
- the esterification reaction is carried out, and continuously to the fully mixed first melt polycondensation reaction tank through the transfer pipe.
- the reaction is carried out at a pressure of 2. OkPaA (hereinafter A means absolute pressure), temperature of 278 ° C, residence time of 1.0 hour in the polycondensation reaction tank.
- the polyester prepolymer was passed through the second melt polycondensation reaction tank and the third melt polycondensation reaction tank, and was continuously taken out from the die plate through the gear pump into a strand shape from the die plate through a gear pump, and the strand was cut under running water to remove the polyester. 4000 parts by mass of prepolymer A particles (average particle size 1.2 mm) were obtained.
- the resulting polyester prepolymer A had an intrinsic viscosity of 0.247 dL / g and a terminal carboxyl group concentration of 55 equivalent Z tons.
- Polyester prepolymer B was produced using the same polyester continuous production equipment used for the production of polyester prepolymer A.
- ethylene glycol tetrabutyl titanate so that the concentration of titanium in the resulting polyester Prevost Rimmer is 8 mass ppm as titanium atoms solution (concentration: 0.075 mass 0/0 as titanium atom)
- 400 parts by mass of bis (betahydroxyethyl) terephthalate was charged into a first ester tank and melted in a nitrogen atmosphere, and maintained at a temperature of 262 ° C and a pressure of 96 kPaG.
- the slurry prepared in (1) was continuously charged so that the average residence time as polyester was 135 parts by mass for Z hours, and the esterification reaction was carried out while distilling off the water produced from the separation tower. While stirring V, the reaction solution was continuously transferred to the second esterification reaction tank.
- the reaction was carried out at a temperature of 260 ° C, a pressure of 5 kPaG, and a residence time of 1.5 hours, and was continuously transferred to the fully mixed first melt polycondensation reaction tank through a transfer pipe.
- the magnesium concentration in the polyester polymer that gives an ethylene glycol solution of magnesium acetate tetrahydrate is 8
- the reaction solution is adjusted so that the phosphorus concentration in the polyester is 8 ppm by mass as the phosphorus atom so that the ethylene glycol solution of ethylene acid phosphate (concentration: 0.030% by mass as the phosphorus atom) can be obtained.
- the reaction is carried out at a pressure of 2.5 kPaA, temperature of 273 ° C, residence time of 1.0 hour in the polycondensation reaction tank, and the reaction product is continuously transferred to the second melt polycondensation reaction tank.
- a melt polycondensation reaction is performed at a pressure of 2.0 kPaA, a temperature of 275 ° C, a residence time of 1.0 hour, and the reaction product is continuously transferred to the third melt polycondensation reaction tank through a transfer pipe. Transferred to.
- the pressure is 2.0 kPaA
- the temperature is 275 ° C
- the residence is Time 1. The melt polycondensation reaction was performed in 2 hours.
- polyester prepolymers are continuously taken out from the die plate through a gear pump through the extraction port in the form of strands, cut into strands under running water, and 4000 parts by mass of polyester prepolymer B particles (average particle size 1.2 mm) are obtained. Obtained.
- the obtained polyester prepolymer B had an intrinsic viscosity of 0.373 dL / g and a terminal carboxyl group concentration of 31 equivalent Z tons.
- Polyester prepolymer A particle 3 Og obtained in the above polyester prepolymer production example is placed on a stainless steel vat with a bottom of 130 mm x 170 mm and a depth of 30 mm, and an inert gas gas inside is 180 ° C. Place in an oven (IPHH-201M type manufactured by Tabai Espec) and perform a crystallization treatment at 180 ° C for 1 hour with a flow rate of nitrogen of 50 NLZ and a temperature of 180 ° C under nitrogen flow. went.
- NL is the volume (L) at 0 ° C and 1 atm.
- the intrinsic viscosity of the polyester prepolymer A after the crystallization treatment was 0.250 dLZg.
- the sample is filled in a glass heat treatment tube (1) whose inner diameter of the sample filling portion is 45 mm.
- Nitrogen heated by the oil filled in the oil bath (5) is introduced into the heat treatment pipe (1) through the flow meter (2), the nitrogen introduction pipe (3), and the nitrogen preheating pipe (4).
- the introduced nitrogen is dispersed by the dispersion plate (6) at the bottom of the heat treatment tube (1) and becomes an upward flow having a substantially uniform linear velocity inside the heat treatment tube (1) and passes through the sample layer (7). To do.
- the nitrogen that has passed through the sample layer (7) is discharged from the gas purge port (9) to the outside of the heat treatment tube (1) through the filter (8) at the top of the heat treatment tube (1).
- the heat treatment pipe (1) has a branch pipe (10), and an opening (normally closed by a glass stopper) force on the upper part of the heat treatment pipe (1) can also input a sample and take a sample.
- the temperature of the sample inside the heat treatment tube (1) can be measured with a thermometer (12) equipped with a thermocouple (11). At the temperature and superficial linear velocity in the range of this example, the internal temperature of the heat treatment pipe (1) is 2 ° C lower than the oil temperature in the oil bath. The temperature of the oil bath was adjusted to 2 ° C higher than the temperature.
- a sample for measuring intrinsic viscosity was collected from the opening of the branch pipe (10). After collecting the sample, change the nitrogen flow rate so that the nitrogen superficial velocity is 1. OmZ seconds at 235 ° C, and install a heat treatment device in the second oil bath (5) adjusted to 237 ° C. Moved. This point is the starting point for the temperature raising process at 235 ° C.
- a sample for measuring intrinsic viscosity was collected from the opening of the branch pipe (10). After collecting the sample, the nitrogen flow rate was changed so that the nitrogen superficial velocity was 0.30 mZ seconds at 230 ° C, and the heat treatment equipment was transferred to an oil bath (5) adjusted to 232 ° C.
- the crystallization process time is not included.
- Example 1 the first oil bath temperature was set to 212 ° C to change the first stage solid phase polycondensation temperature to 210 ° C, and the solid phase polycondensation time was changed to 2 hours. It went in the same way. The results are shown in Table 1.
- Example 2 The same procedure as in Example 2 was performed except that the first stage solid phase polycondensation time was changed to 4 hours in Example 2. The results are shown in Table 1.
- Example 2 the first stage solid phase polycondensation operation was omitted after the sample was charged, and the temperature raising step and the second stage solid phase polycondensation were performed in the same manner as in Example 2. The results are shown in Table 1. [0181] (Comparative Example 2)
- Example 2 the same procedure as in Example 2 was performed except that the first-stage solid-phase polycondensation temperature was changed to 220 ° C. by changing the first oil bath temperature to 222 ° C. The results are shown in Table 1.
- Example 2 after the first stage solid-phase polycondensation, the nitrogen was continuously immersed in the first oil bath (5) so that the nitrogen superficial velocity was 1. OmZ seconds at 220 ° C.
- the oil temperature in the oil bath (5) was continuously raised from 212 ° C to 232 ° C over 120 minutes, and after 120 minutes, the intrinsic viscosity from the opening of the branch pipe (10) Take a measurement sample and continue to immerse it in the first oil bath (5), then change the nitrogen flow rate so that the nitrogen superficial velocity is 0.30 mZ seconds at 230 ° C.
- the same procedure as in Example 2 was performed except that the second stage solid-phase polycondensation start point at 230 ° C. was used as this starting point. The results are shown in Table 1.
- polyester prepolymer A was placed on polyester prepolymer B.
- the sampling time in the second stage solid phase polycondensation step was changed to 8 hours, 16 hours, and 32 hours.
- the intrinsic viscosity IV of the polyester prepolymer B after crystallization treatment was 0.380 dLZg. The results are shown in Table 2.
- Example 4 after performing the first stage solid phase polycondensation, the same procedure as in Example 4 was performed except that the 235 ° C temperature rising step was omitted and the process immediately moved to the second stage solid phase polycondensation at 230 ° C. The results are shown in Table 2.
- Example 4 after the first stage solid-phase polycondensation, the nitrogen was continuously immersed in the first oil bath (5) so that the nitrogen superficial velocity was 1. OmZ seconds at 220 ° C.
- the oil temperature in the oil bath (5) was continuously increased from 212 ° C to 232 ° C over 20 minutes, and after 20 minutes, the intrinsic viscosity from the opening of the branch pipe (10) Take a measurement sample and continue to immerse it in the first oil bath (5), then change the nitrogen flow rate so that the nitrogen superficial velocity is 0.30mZ at 230 ° C.
- the same procedure as in Example 4 was conducted except that the second stage solid phase polycondensation was started at 230 ° C. The results are shown in Table 2.
- Example 4 Same as Example 4 except that after loading the sample in Example 4, the first stage solid phase polycondensation and the 235 ° C temperature rising step were omitted, and the process immediately moved to the second stage solid phase polycondensation at 230 ° C. Went to.
- Table 2 The results are shown in Table 2.
- the sample after this heat treatment could be easily taken out from the heat treatment tube (1). No fusion between the samples was observed.
- the solid phase polycondensation process is only the high-temperature second stage solid phase polycondensation process, and the solid phase polycondensation rate is low.
- the solid phase polycondensation rate is small because the difference in the solid phase polycondensation temperature between the first stage solid phase polycondensation process and the second stage solid phase polycondensation process is less than 15 ° C.
- Comparative Example 3 the difference in intrinsic viscosity between the end of the first stage solid phase polycondensation process and the start of the second stage solid phase polycondensation process is 0.1 lOdLZg or more, and the solid phase polycondensation rate is low. In Comparative Example 4, since only the high temperature second stage solid phase polycondensation step is used, the solid phase polycondensation rate is low.
- Slurry preparation tank with stirrer, ethylene glycol feed pipe and terephthalic acid feed pipe; pipes for transferring slurry and esterification reaction product to each esterification reaction tank; stirrer, separation tower, raw material inlet, catalyst charge Completely mixed first and second esterification reactors with piping and reactant transfer piping; piping for transferring esterification reactants (oligomers) to the melt polycondensation reactor; stirrer, separation tower, oligomer inlet, Catalyst mixing Fully mixed first melt polycondensation reactor with piping; Stirrer, separation tower, polymer inlet, plug flow type second and third melt polycondensation reactor with polymer outlet; Prepolymer from the outlet A particle generator that takes out strands from a die plate via a gear pump and cuts the strands under water cooling (Strand cutter is a writer) ⁇ Otomachi click Ltd. pelletizer one (P- USG100)) using PET Pureborima continuous manufacturing device equipped with.
- the slurry prepared in the slurry preparation tank was continuously charged so that the average residence time as PET prepolymer was 4.5 hours at 135 parts by mass Z time, Esterification reaction is carried out while distilling off the generated water from the separation tower! While the reaction liquid is continuously transferred to the second esterification reaction tank Sent.
- the concentration of antimony in the resulting PET prepolymer is 183 mass p pm as antimony atoms.
- a continuous mixing-type first melt polycondensation reaction tank is conducted through the transfer pipe while conducting an esterification reaction while continuously adding ethylene glycolene solution (concentration: 1.8% by mass as antimony atom concentration). Were transferred continuously.
- the reaction is carried out at a pressure of 2.5 kPaA (hereinafter A means absolute pressure), a temperature of 273 ° C and a residence time of 1.0 hour.
- the PET prepolymer was passed through the second melt polycondensation reaction tank and the third melt polycondensation reaction tank, and was continuously taken out from the die plate through the gear pump through the gear extraction pump into a strand shape, and then the strand was cut under the water stream to form the PET. 4000 parts by mass of prepolymer A particles (average particle size 1.2 mm) were obtained.
- the obtained PET prepolymer A had an intrinsic viscosity of 0.247 dL / g and a terminal carboxyl group concentration of 55 equivalent Z tons.
- PET prepolymer B was produced using the same PET prepolymer production equipment that was used for the production of PET prepolymer A.
- ethylene glycol tetrabutyl titanate so that the concentration of titanium in the resulting PET Pureborima is 8 mass ppm as titanium atom solution (concentration: 0.075 mass as titanium atom 0/0 ) Terephthalic acid Z ethylene glycol (molar ratio 1: 1.5) slurry was prepared.
- 400 parts by mass of bis (betahydroxyethyl) terephthalate was charged into a first ester tank reactor and melted in a nitrogen atmosphere, and maintained at a temperature of 262 ° C and a pressure of 96 kPaG.
- the slurry prepared in the tank was continuously charged so that the average residence time as PET prepolymer was 4.5 hours at 135 parts by mass Z time, and the ester water was distilled off while distilling off the water generated from the separation column. While the soot reaction was performed, the reaction solution was continuously transferred to the second esterification reaction tank.
- the reaction was performed at a temperature of 260 ° C, a pressure of 5 kPaG, and a residence time of 1.5 hours, and the reaction product was continuously transferred to the fully mixed first melt polycondensation reaction tank through a transfer pipe. It was transferred to.
- the melt polycondensation reaction is carried out at a pressure of 3.5 kPaA, a temperature of 274 ° C, a residence time of 1.0 hour, and the reaction product is continuously transferred to the third melt polycondensation reaction tank through a transfer pipe. Transferred.
- the melt polycondensation reaction was performed at a pressure of 3.5 kPaA, a temperature of 275 ° C, and a residence time of 1.2 hours.
- the obtained PET prepolymer is continuously drawn out from the die plate through a gear pump through a gear pump, and is cut into strands under water flow to obtain 4000 parts by mass of PET prepolymer B particles (average particle size 1.2 mm). It was.
- the obtained PET prepolymer B had an intrinsic viscosity of 0.308 dLZg and a terminal carboxyl group concentration of 35 equivalent Z tons.
- Inert oven (Tabaye Spec) with 30g of PET prepolymer A particles obtained in the above production example, placed on a stainless steel bat with a bottom of 130mm x 170mm and a depth of 30mm, and an internal gas temperature of 180 ° C. Incorporated IPHH-201M))
- the crystallization process is carried out at 180 ° C for 1 hour with a nitrogen flow of 50 NLZ and a temperature of 180 ° C. went.
- NL is the volume (L) at 0 ° C and 1 atm.
- the intrinsic viscosity of the sample PET prepolymer A after crystallization treatment was 0.250 dLZg.
- the PET prepolymer B particles were crystallized in the same manner.
- the intrinsic viscosity IV of the sample PET prepolymer B after crystallization treatment was 0.321 dLZg.
- the above crystallized PET prepolymer A particles were heat-treated with a glass heat treatment apparatus shown in FIG.
- the heat treatment apparatus is as described above.
- a sample for measuring intrinsic viscosity was taken from the opening of the branch pipe (10). After collecting the sample, change the nitrogen flow rate so that the nitrogen superficial velocity is 1. OmZ seconds at 235 ° C, and install a heat treatment device in the second oil bath (5) adjusted to 237 ° C. Moved. This point is the start of the heating process at 235 ° C. After 10 minutes, a sample for measuring intrinsic viscosity was collected from the opening of the branch pipe (10).
- the nitrogen flow rate was changed so that the nitrogen superficial velocity was 0.30mZ seconds at 230 ° C, and a heat treatment device was installed in the oil bath (5) adjusted to 232 ° C. Moved. This time was set as the start of the second stage solid phase polycondensation at 230 ° C.
- Samples for measuring the intrinsic viscosity were collected at 12 hours, 24 hours, and 36 hours at the starting point of the second stage solid phase polycondensation. Intrinsic viscosities were measured on measurement samples collected after the first stage solid phase polycondensation, after the heating step, and after the second stage solid phase polycondensation. Table 3 shows the heat treatment conditions and measurement results.
- the polycondensation process time was obtained by adding the first stage solid phase polycondensation time and the temperature raising process time. Does not include crystallization process time.
- Example 7 the first oil bath temperature was set to 212 ° C, the first stage solid phase polycondensation temperature was changed to 210 ° C, and the solid phase polycondensation time was changed to 2 hours. It went in the same way. The results are shown in Table 3.
- Example 10 The same procedure as in Example 8 was performed except that the first stage solid phase polycondensation time was changed to 4 hours in Example 8. The results are shown in Table 3. [0202] (Example 10)
- Example 8 The same procedure as in Example 8 was performed except that the first stage solid phase polycondensation time was changed to 8 hours in Example 8. The results are shown in Table 3.
- Example 8 after introducing the PET prepolymer A after the crystallization treatment, the first-stage solid phase polycondensation operation was omitted, and the temperature raising step and the second-stage solid phase polycondensation were the same as in Example 8. went. The results are shown in Table 3.
- Example 8 The same operation as in Example 8 was conducted except that the first oil-phase polycondensation temperature was changed to 220 ° C. by changing the first oil bath temperature to 222 ° C. in Example 8. The results are shown in Table 3.
- Example 8 the particles of PET prepolymer A after the crystallization treatment were replaced with the particles of PET prepolymer B, and the sampling times in the second stage solid phase polycondensation step were 8 hours, 16 hours, and 32 hours.
- the procedure was the same as Example 8 except that the change was made.
- the results are shown in Table 4.
- the phase polycondensation process time was determined by adding the first stage solid phase polycondensation time and the temperature raising process time. The crystallization process time is not included.
- Example 11 after performing the first stage solid phase polycondensation, the same procedure as in Example 11 was performed, except that the 235 ° C temperature rising step was omitted and the process immediately moved to the second stage solid phase polycondensation at 230 ° C.
- Table 4 The results are shown in Table 4.
- Example 12 The same operation as in Example 12 was conducted except that the first oil-phase polycondensation temperature was changed to 220 ° C. by changing the first oil bath temperature to 222 ° C. in Example 12. The results are shown in Table 4.
- Example 11 after adding the crystallized PET prepolymer B particles, the first-stage solid-phase polycondensation and the 235 ° C heating step were omitted, and immediately the second-stage solid-phase polycondensation at 230 ° C.
- the same procedure as in Example 11 was carried out except that The results are shown in Table 4. Table 3.
- Phase 1 polycondensation 1st stage solid phase process 2nd stage solidification process 12 works /
- Comparative Examples 6 and 7 the difference in the solid-phase polycondensation temperature between the first stage and the second stage is less than 15 ° C, so in Comparative Example 8 where the solid-phase polycondensation reaction rate is small, only the high-temperature second stage is used. Because of this, the solid-phase polycondensation reaction rate is low.
- PET prepolymer polymer manufacturing apparatus used for the production of the above PET prepolymer A, the dicarboxylic acid and the diol are esterified and further melt polycondensed to obtain a molten PET prepolymer from the die plate.
- PET Prebomer C was produced by taking out and cutting into a shape. Specifically, it is as follows.
- the slurry prepared in the slurry preparation tank is continuously charged so that the average residence time as polyester is 4.5 hours at 135 parts by mass Z time, While distilling off the water produced from the separation tower, the reaction solution was continuously transferred to the esterification second reaction tank while carrying out the esterification reaction.
- the esterification reaction was carried out at a temperature of 260 ° C, a pressure of 5 kPaG, and a residence time of 1.5 hours, and continuously transferred to the fully mixed first melt polycondensation reactor through a transfer pipe. .
- the reaction is performed at a temperature of 270 ° C, a pressure of 4. OkPaA (A indicates absolute pressure), and a residence time of 1.0 hour, and the second melt polycondensation is conducted through a transfer pipe. It was continuously transferred to the reaction tank.
- the melt polycondensation reaction was performed at a temperature of 270 ° C., a pressure of 4. OkPa A, and a residence time of 1.0 hour, and transferred to the third melt polycondensation reaction tank through a transfer pipe.
- temperature 270 ° C, pressure 4. OkPaA The melt polycondensation reaction was carried out with a residence time of 1.2 hours.
- the molten PET prepolymer obtained in this way is directly guided to the die head through a gear pump and an extraction pipe, and the die hole force is also taken out in a strand shape. After cooling with water, it is manufactured by a pelletizer (P—USG100) manufactured by Reuter's Automatic. Grained.
- the granulation method is a strand cut method. Specifically, the strand-shaped PET prepolymer is brought into contact with water and cooled, and is transported in the direction of the cutter together with water, and is applied to a pair of take-up rolls installed in front of the cutter. Then, the particles were picked up, supplied to a cutter, and cut with a cutter having fixed teeth and rotating teeth to obtain particles of PET prebolimer C.
- This strand-like PET prepolymer was landed in the water cooling zone of the strand cutter through an air cooling distance of 100 mm or more, conveyed while being cooled with water at 50 ° C, taken up by a take-up roll, and supplied to a cutter.
- the strand take-up speed was 3. OOmZ seconds, and the cutter was made into particles by adjusting the ratio of the number of rotations of the take-up roll and the rotating teeth so that the length in the particle take-up direction was 1. Omm.
- a PET prepolymer C particle having an elliptic cylinder shape was obtained, which was close to a shape having semi-cylinders attached to both ends of a substantially rectangular parallelepiped having a length of 1. Omm, a width of 1.3 mm, and a thickness of 0.9 mm.
- the intrinsic viscosity of the particles was 0.290 dL / g
- the terminal carboxyl group concentration was 22 equivalents / ton
- the copolymerization amount of diethylene glycol was 2.0 mol%
- the average mass was 1.5 mgZ particles.
- the PET prepolymer C particles are referred to as “prepolymer C”.
- IPHH-201M Inert oven (IPHH-201M, manufactured by Tapai Yec) with the above prepolymer C30g placed on a stainless steel vat with a bottom of 130mm x 170mm and a depth of 30mm and an internal gas temperature of 180 ° C
- Tx 180 ° C for 1 hour under the flow rate of nitrogen of 50 NLZ and the temperature of 180 ° C.
- NL is the volume (L) at 0 ° C and 1 atm.
- the intrinsic viscosity of the sample after crystallization treatment was 0.290 dL / g, and the crystallinity was 53% by mass.
- the sample obtained by crystallization treatment of Prebomer C was subjected to heat treatment using a glass heat treatment apparatus shown in FIG.
- the heat treatment apparatus is as described above.
- Intrinsic viscosities were measured for the measurement samples collected after the first stage solid phase polycondensation, after the heating step, and during the second stage solid phase polycondensation.
- the heat treatment conditions and measurement results are shown in Table 5 [V—A].
- Example 13 was carried out in the same manner as Example 13 except that all the temperature raising steps were not carried out. The results are shown in Table 5 [V—A].
- Example 13 the production of PET prepolymer C was carried out in the same manner as in Example 13, the production of PET prepolymer C, except that the discharge amount of the molten PET prepolymer was changed to lOOkgZ.
- an elliptical columnar PET prepolymer particle C ' having a length of 1. Omm, a width of 1.6 mm, and a thickness of 1.2 mm was obtained.
- This particle C ′ had a solid viscosity of 0.290 dL / g, a terminal carboxyl group concentration of 22 equivalents / ton, a copolymerization amount of diethylene glycol of 2.0 mol%, and an average mass of 2.3 mgZ particles.
- Example 14 The same procedure as in Example 14 was performed except that the temperature raising step was not performed in Example 14. The results are shown in Table 5 [V—A].
- Example 13 was carried out in the same manner as Example 13 except that the temperature in the temperature raising step was changed to 220 ° C.
- the results are shown in Table 5 [V—A].
- Example 13 the temperature raising step was performed in the same manner as in Example 13 except that the temperature raising rate was 0.42 ° CZ and the temperature raising time was 60 minutes. The results are shown in Table 5 [V—A].
- Example 13 the production of PET prepolymer C>
- tetra-n-butyl titanate in an amount of 8 ppm by mass as titanium atoms was obtained with respect to the obtained PET.
- Contain terephthalic acid Z isophthalic acid Z ethylene glycol (mol ratio 0.97: 0.03: 1.5) Slurry change the pressure of the first melt polycondensation reactor to 3.8 kPaA, The temperature of the second and third melt polycondensation reactors was changed to 275 ° C, the pressure was changed to 3.8 kPa A, the die plate was changed to one with 10 holes, and the discharge rate of molten polyester was changed to 78 kgZ.
- PET prepolymer particles were obtained in the same manner as in Example 13.
- particles of an elliptic cylinder-shaped PET prebolimer D having a length of 1. Omm, a width of 1. Omm, and a thickness of 0.7 mm and having a shape similar to a semi-cylinder attached to both ends were obtained.
- the intrinsic viscosity of this particle is 0.323dLZg
- the terminal carboxyl group concentration is 26 equivalents Z ton
- the copolymerization amounts of isophthalic acid and diethylene glycol are 2.9 mol%, 2.2 mol%
- the average mass is 1.4 mgZ particles, respectively. there were.
- the particles of the PET prepolymer D are referred to as “prepolymer D”.
- the sample was changed to Prebolimer D as described above, and the conditions of the first stage solid phase polycondensation step, the temperature rising process, and the second stage solid phase polycondensation process were changed as shown in Table 5 [V-B].
- a heat treatment was performed in the same manner as in Example 13 except that the sample for measuring the intrinsic viscosity was changed to 16 hours and 32 hours from the start point by solid phase polycondensation.
- the intrinsic viscosity of the sample after the crystallization treatment was 0.331 dLZg.
- Table 5 [VB] shows the heat treatment conditions and measurement results.
- Example 15 was carried out in the same manner as Example 15 except that the temperature raising step was not carried out. The results are shown in Table 5 [V—B].
- Example 15 the conditions of the first stage and second stage solid phase polycondensation steps were changed as shown in Table 5 [V-C], and samples for measuring intrinsic viscosity were collected by the second stage solid phase polycondensation.
- the heat treatment was performed in the same manner as in Example 15 except that was changed from 24 to 24 hours from the start point. The results are shown in Table 5 [V—C].
- the second-stage solid-phase polycondensation process time is calculated by adding the first-stage solid-phase polycondensation time and the heating process time, and does not include the crystallization process time.
- Example 16 was carried out in the same manner as Example 16 except that the temperature raising step was not carried out. The results are shown in Table 5 [V—C].
- Example 16 The same procedure as in Example 16 was performed except that the conditions of the first-stage solid phase polycondensation step in Example 16 were changed as shown in Table 5 [VC]. The results are shown in Table 5 [V—C].
- Example 17 was carried out in the same manner as Example 17 except that the temperature raising step was not carried out. The results are shown in Table 5 [V—C].
- the fusing test shown in FIG. 10 was carried out using the PET particles carried out until the heating step in Example 13 (hereinafter referred to as “particle C after the heating step”). A fusion test was performed with the equipment loaded.
- the sample is filled in a glass heat treatment tube (21) having an inner diameter of 14 mm.
- Nitrogen heated by the oil filled in the oil bath (25) passes through the gas flow meter (22), the nitrogen introduction pipe (23), and the nitrogen preheating pipe (24) into the heat treatment pipe (21). be introduced.
- the introduced nitrogen is dispersed by the diffusion plate (26) at the lower part of the heat treatment tube (21) and becomes an ascending flow having a substantially uniform linear velocity inside the heat treatment tube (21), and passes through the sample layer (27). pass.
- the nitrogen that has passed through the sample layer (27) is discharged to the outside of the gas purge port (29) force heat treatment tube (21) through the filter (28) at the top of the heat treatment tube (21).
- the temperature of the sample inside the heat treatment tube (21) is greatly increased, and it is equal to the oil temperature in the oil bath by filling another sample and measuring with a thermometer equipped with a thermocouple. It was confirmed that the temperature was reached.
- a stainless steel hollow column (31) can be placed on the sample layer (27) via a stainless steel wire mesh (30).
- a pedestal (33) for placing a weight can be fixed to the support (31) using a pin (32) (the weight of the support (31) is 80g, the pin (32) and the pedestal ( The total mass of 33) is 42 g).
- the vacant line velocity of nitrogen in the heat treatment tube (21) (here, “empty line velocity” means the vacant line velocity of the sample layer (hereinafter the same)) is 0,230 ° C.
- the flow rate of nitrogen was set with a gas flow meter (22) so as to be 40 mZ seconds, and the fusion test apparatus was immersed in an oil bath (25) adjusted to 235 ° C.
- the sample layer temperature was set to 235 ° C by holding for 10 minutes.
- the temperature of the oil filled in the oil bath (25) was lowered to 230 ° C over 10 minutes. This point is the start of the fusion test at 230 ° C.
- the load applied to the sample layer (27) was only equivalent to the mass of the column (30) (80 g weight).
- the pin (32) on the support (30) A pedestal (33) was attached, and the load on the material was 122g. 1.
- a weight was placed on the pedestal (33), and the load was 160 g weight. After that, every 0.5 hour, increase the load to 196g weight, 231g weight, 265g weight, 298g weight, 330g weight!
- the fusion test apparatus was lifted from the oil bath, allowed to cool for 10 minutes, and then the nitrogen flow was stopped, and the weight (including support pillars, pins, and pedestals) was removed. The sample was extracted on a sieve with an aperture of 2. Omm and classified gently to measure the fusion ratio (mass ratio of the sample on the sieve).
- the fusion ratio was 0.4% by mass, and the result showed that the fusion resistance was excellent at 230 ° C under load.
- Example 18 the sample was changed to PET particles that had been subjected to the heating process in Example 16, and the flow rate of nitrogen was adjusted so that the superficial linear velocity was 0.40 mZ seconds at 215 ° C. ) And change the temperature of the oil bath (25) adjusted to 235 ° C to 215 ° C over 10 minutes and change the temperature to 215 ° C. At this point, start and change the anti-fusing test at 215 ° C. Except for this, perform the same operation as in Example 18.
- the fusion ratio was 11% by mass.
- Example 16 The same procedure as in Example 16 was carried out until the temperature raising step except that the time for the first stage solid phase polycondensation step was changed to 4 hours.
- the obtained PET particles had an intrinsic viscosity of 0.476dLZg.
- Example 19 The same procedure as in Example 19 was performed except that the sample was changed to PET particles having an intrinsic viscosity of 0.476 dLZg as described in Example 19.
- the fusion ratio was 0.3% by mass, and the results showed that the fusion resistance was superior to the sample used in Example 19.
- Prebomer D Using Prebomer D described in Example 15, heat treatment in a solid state was continuously performed. A heat treatment test was conducted. In other words, Prebolimer D is continuously supplied to a fully mixed fluidized bed, and the first stage crystallization treatment is performed at an average linear residence time of 60 minutes under an air atmosphere of a superficial linear velocity of 3.2 mZ seconds and 120 ° C. (Crystallization step) and continuously discharged. The obtained sample is continuously supplied to the fluidized bed with plug flow property via the transfer pipe, and the average linear residence time is 15 minutes under a nitrogen velocity of 1.3 mZ seconds and 180 ° C. The second-stage crystallization treatment was performed (crystallization step), and continuously discharged.
- the obtained sample is continuously supplied to the moving bed via the transfer pipe, and the first stage solid-phase polycondensation treatment is performed in a nitrogen atmosphere at 210 ° C with an average residence time of 120 minutes.
- the first-stage solid phase polycondensation step) was continuously discharged.
- the obtained sample was allowed to cool under a nitrogen atmosphere.
- the intrinsic viscosity of the sample after being allowed to cool was 0.347 dLZg.
- the sample is continuously supplied to a fully mixed fluidized bed and reheated at an average residence time of 10 minutes in an air atmosphere at a superficial linear velocity of 3.2 mZ seconds and 180 ° C. It was discharged continuously.
- the obtained sample is continuously supplied to the fluidized bed with plug flow through the transfer pipe, and the average residence time is 15 minutes in a nitrogen atmosphere with a superficial linear velocity of 1.6 mZ seconds and 240 ° C.
- the temperature was raised at (temperature raising step) and discharged continuously.
- the temperature of the sample just before the heating process exit was 232 ° C.
- the obtained sample is continuously supplied to the moving bed via the transfer pipe, and the second stage solid phase polycondensation treatment is performed in a nitrogen atmosphere at 215 ° C with an average residence time of 14 hours. Drained continuously.
- the obtained sample was allowed to cool in a nitrogen atmosphere.
- the intrinsic viscosity of the sample after being allowed to cool was 0.737d LZg.
- Example 21 a sample was taken at the temperature raising step exit.
- the intrinsic viscosity of this sample was 0.386 dLZg.
- 30 g of this sample was charged into the heat treatment pipe (1) of the heat treatment apparatus shown in FIG. 9 from the opening of the branch pipe (10), and nitrogen was circulated to replace the inside with nitrogen.
- the nitrogen flow rate was set with a gas flow meter (2) and adjusted to 212 ° C so that the nitrogen superficial velocity in the heat treatment tube (1) was 0.30mZ seconds at 210 ° C.
- the heat treatment apparatus was immersed in the oil bath (5). This point is the start of the second stage solid phase polycondensation at 210 ° C.
- the sample for measuring the intrinsic viscosity was obtained from the opening of the branch pipe (10) at 32 and 64 hours. Collected.
- the intrinsic viscosities of these samples were 0.741 dLZg and 0.853 dLZg, respectively.
- the time required for the intrinsic viscosity to reach 0.70 dLZg and 0.80 dLZg was 30.6 hours and 51.1 hours, respectively.
- the first stage solid phase polycondensation process and the temperature raising process are performed in a 210 ° C continuous moving bed and a 232 ° C continuous fluidized bed, respectively, and the second stage solid phase polycondensation process is performed. This was carried out in a 210 ° C batch fixed bed.
- Example 21 after the first stage solid-phase polycondensation treatment, the sample was collected by cooling in a nitrogen atmosphere.
- the intrinsic viscosity of this sample was 0.347 dL / g. Except for using this sample, heat treatment was performed in the same manner as in Example 22 and a sample for measuring intrinsic viscosity was collected.
- the intrinsic viscosities of these samples were 0.6811 dLZg and 0.777 dLZg, respectively.
- the time required for the intrinsic viscosity to reach 0.70 dLZg and 0.80 dLZg was 40.3 hours and 73.7 hours, respectively.
- the first stage solid-phase polycondensation step is performed in a 210 ° C continuous moving bed, and the second stage solid-phase polycondensation step is notched at 210 ° C without performing the heating step. It was carried out on the floor.
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Abstract
Description
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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BRPI0615312-7A BRPI0615312A2 (pt) | 2005-09-01 | 2006-08-31 | aparelho para um tratamento térmico de partìculas de poliéster, e, métodos de policondensação em fase sólida de multi-estágios para partìculas de poliéster, e de produção de um poliéster, e de um tereftalato de polietileno |
AT06797220T ATE485329T1 (de) | 2005-09-01 | 2006-08-31 | Verfahren zur wärmebehandlung von polyesterteilchen und verfahren zur mehrstufigen festphasenpolykondensation von polyesterteilchen |
US12/065,186 US20080207868A1 (en) | 2005-09-01 | 2006-08-31 | Apparatus for Heat Treatment of Polyester Particle and Method of Multistage Solid-Phase Polycondensation of Polyester Particle |
DE602006017719T DE602006017719D1 (de) | 2005-09-01 | 2006-08-31 | Verfahren zur wärmebehandlung von polyesterteilchen und verfahren zur mehrstufigen festphasenpolykondensation von polyesterteilchen |
EP06797220A EP1939238B1 (en) | 2005-09-01 | 2006-08-31 | Apparatus for heat treatment of polyester particle and method of multistage solid-phase polycondensation of polyester particle |
US13/173,975 US20110257357A1 (en) | 2005-09-01 | 2011-06-30 | Apparatus for heat treatment of polyester particle and method of multistage solid-phase polycondensation of polyester particle |
US13/173,910 US20110257349A1 (en) | 2005-09-01 | 2011-06-30 | Apparatus for heat treatment of polyester particle and method of multistage solid-phase polycondensation of polyester particle |
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JP2005-253286 | 2005-09-01 | ||
JP2005253286A JP4784213B2 (ja) | 2005-09-01 | 2005-09-01 | ポリエステルの製造方法 |
JP2005-259383 | 2005-09-07 | ||
JP2005259383A JP4784216B2 (ja) | 2005-09-07 | 2005-09-07 | ポリエチレンテレフタレートの製造方法 |
JP2005273293 | 2005-09-21 | ||
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JP2006-129284 | 2006-05-08 | ||
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US13/173,975 Division US20110257357A1 (en) | 2005-09-01 | 2011-06-30 | Apparatus for heat treatment of polyester particle and method of multistage solid-phase polycondensation of polyester particle |
US13/173,910 Division US20110257349A1 (en) | 2005-09-01 | 2011-06-30 | Apparatus for heat treatment of polyester particle and method of multistage solid-phase polycondensation of polyester particle |
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US (3) | US20080207868A1 (ja) |
EP (2) | EP2202259B1 (ja) |
CN (2) | CN102516508A (ja) |
AT (2) | ATE547451T1 (ja) |
BR (1) | BRPI0615312A2 (ja) |
DE (1) | DE602006017719D1 (ja) |
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US8329857B2 (en) | 2006-08-02 | 2012-12-11 | Mitsubishi Chemical Corporation | Polyester resin particle and method for producing the same |
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- 2006-08-31 CN CN2011102916413A patent/CN102516508A/zh active Pending
- 2006-08-31 CN CN201110295948.0A patent/CN102408548B/zh not_active Expired - Fee Related
- 2006-08-31 EP EP06797220A patent/EP1939238B1/en not_active Not-in-force
- 2006-08-31 AT AT10152497T patent/ATE547451T1/de active
- 2006-08-31 BR BRPI0615312-7A patent/BRPI0615312A2/pt not_active IP Right Cessation
- 2006-08-31 US US12/065,186 patent/US20080207868A1/en not_active Abandoned
- 2006-08-31 WO PCT/JP2006/317260 patent/WO2007026841A1/ja active Application Filing
- 2006-08-31 AT AT06797220T patent/ATE485329T1/de not_active IP Right Cessation
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2011
- 2011-06-30 US US13/173,910 patent/US20110257349A1/en not_active Abandoned
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8329857B2 (en) | 2006-08-02 | 2012-12-11 | Mitsubishi Chemical Corporation | Polyester resin particle and method for producing the same |
CN101579610A (zh) * | 2008-05-14 | 2009-11-18 | 比勒股份公司 | 用于松散材料的快速热处理的设备和方法 |
CN101579610B (zh) * | 2008-05-14 | 2013-11-20 | 比勒股份公司 | 用于松散材料的快速热处理的设备和方法 |
Also Published As
Publication number | Publication date |
---|---|
CN102408548B (zh) | 2013-05-15 |
CN102408548A (zh) | 2012-04-11 |
BRPI0615312A2 (pt) | 2012-12-04 |
DE602006017719D1 (de) | 2010-12-02 |
US20110257349A1 (en) | 2011-10-20 |
EP2202259A3 (en) | 2010-12-01 |
EP2202259A2 (en) | 2010-06-30 |
EP2202259B1 (en) | 2012-02-29 |
ATE547451T1 (de) | 2012-03-15 |
CN102516508A (zh) | 2012-06-27 |
EP1939238A1 (en) | 2008-07-02 |
EP1939238A4 (en) | 2009-07-01 |
US20080207868A1 (en) | 2008-08-28 |
EP1939238B1 (en) | 2010-10-20 |
US20110257357A1 (en) | 2011-10-20 |
ATE485329T1 (de) | 2010-11-15 |
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