WO2016088578A1 - 易重合性物質の精製方法 - Google Patents
易重合性物質の精製方法 Download PDFInfo
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- WO2016088578A1 WO2016088578A1 PCT/JP2015/082681 JP2015082681W WO2016088578A1 WO 2016088578 A1 WO2016088578 A1 WO 2016088578A1 JP 2015082681 W JP2015082681 W JP 2015082681W WO 2016088578 A1 WO2016088578 A1 WO 2016088578A1
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- polymerizable substance
- easily polymerizable
- insoluble matter
- liquid
- solid insoluble
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0021—Vortex
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
- B01D21/2411—Feed mechanisms for settling tanks having a tangential inlet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
- B01D21/267—Separation of sediment aided by centrifugal force or centripetal force by using a cyclone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/008—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with injection or suction of gas or liquid into the cyclone
Definitions
- the present invention relates to a method for purifying an easily polymerizable substance such as (meth) acrylic acid, and particularly includes a separation step by a wet cyclone.
- Patent Document 1 As a means for removing such solid insoluble matter, for example, as shown in Patent Document 1, there is a body portion having a fluid inlet pipe and a fluid outlet pipe, and between the fluid inlet and the fluid outlet in the body portion. There is a solid matter removing device having a filtration part made of a wire mesh or the like disposed in the wall.
- an object of the present invention is to provide a method for efficiently purifying easily polymerizable substances by improving the complexity of work, such as by reducing the number of cleaning of wire meshes.
- the apparatus, apparatus, etc. which have a thin piping diameter have not been conventionally used for the process of the high temperature bottoms containing an easily polymerizable substance.
- the present inventors have used wet cyclone having a thin pipe diameter, and are contained in a high-temperature bottomed liquid, contrary to the conventional knowledge described above.
- the present inventors completed the present invention by separating solid insoluble materials and improving the complexity of cleaning operations and the like, and efficiently purifying easily polymerizable substances.
- the method for purifying an easily polymerizable substance according to the present invention is a method for purifying an easily polymerizable substance, wherein a crude easily polymerizable substance-containing liquid is introduced into a distillation column and is extracted from the recovery section of the distillation column. It includes a first separation step in which the bottoms are introduced into a wet cyclone and separated into a first purified easily polymerizable substance-containing liquid and a solid insoluble matter-containing liquid.
- a first separation step in which the bottoms are introduced into a wet cyclone and separated into a first purified easily polymerizable substance-containing liquid and a solid insoluble matter-containing liquid.
- the wet cyclone preferably separates solid insoluble matters having a particle size of 450 ⁇ m or more, and the removal rate of solid insoluble matters having a particle size of 450 ⁇ m or more is preferably 90% or more.
- the speed of the bottoms when introduced into the wet cyclone is 0.1 m ⁇ s ⁇ 1 or more and 2.0 m ⁇ s ⁇ 1 or less.
- the temperature of the bottoms introduced into the wet cyclone is preferably higher than 70 ° C. and lower than 120 ° C.
- the flow rate of the solid insoluble matter-containing liquid is desirably 10% or less of the bottomed liquid per unit time.
- this invention includes the 2nd isolation
- the circulation process which introduce
- the easily polymerizable substance remaining in the second purified easily polymerizable substance-containing liquid can be recovered more efficiently.
- the said easily polymerizable substance is acrylic acid, methacrylic acid, acrylic acid ester, or methacrylic acid ester.
- the separator is extracted by introducing the bottoms extracted from the recovery section of the distillation tower into a wet cyclone and separating the first purified easily polymerizable substance-containing liquid and the solid insoluble matter-containing liquid. Since the number of cleanings can be reduced, an easily polymerizable substance can be purified efficiently. In addition, this method is preferable for the worker from the viewpoint of mental and safety because it can reduce the chance of the worker coming into contact with the chemical substance during the cleaning work. Furthermore, since the loss of the easily polymerizable substance can be reduced by introducing and circulating the second purified easily polymerizable substance-containing liquid after the second separation step into the distillation column, the production efficiency of the easily polymerizable substance is improved. be able to.
- FIG. 1 is a schematic diagram showing a flow of a method for purifying an easily polymerizable substance according to the present invention.
- FIG. 2A is a schematic diagram showing a front view of the wet cyclone used in the examples.
- FIG. 2B is a schematic diagram showing a side view of the wet cyclone used in the examples.
- a crude easily polymerizable substance-containing liquid is introduced into a distillation column, and a bottom liquid extracted from a recovery part of the distillation tower is introduced into a wet cyclone. It includes a first separation step of separating the purified easily polymerizable substance-containing liquid and the solid insoluble matter-containing liquid. Since the wet cyclone does not have a net for collecting solids such as in a strainer or the like, it does not clog even when operated for a long time. For this reason, in the past, it took time and money to clean the strainer, and even when a heavy load was applied to workers, these problems can be solved by introducing a wet cyclone.
- FIG. 1 shows a flow of a method for purifying an easily polymerizable substance according to the present invention.
- the easily polymerizable substance means a polymerizable monomer that can be polymerized by temperature, pressure, contact, stirring or the like.
- examples of such easily polymerizable substances include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, fumaric acid, maleic acid, maleic anhydride, and esters thereof.
- examples of the hydroxyl group-containing compound that can constitute the ester body with the unsaturated carboxylic acid include aliphatic alcohols or alicyclic alcohols having 1 to 12 carbon atoms.
- Multivalent Arco Le; etc. can be mentioned, which may have a branch be of straight chain. These may be used alone or in combination of two or more.
- Preferred easily polymerizable substances are acrylic acid, methacrylic acid, acrylic acid ester, or methacrylic acid ester, more preferably acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate.
- the crude easily polymerizable substance-containing liquid refers to a liquid that contains an easily polymerizable substance and impurities and is introduced into a distillation column.
- Examples of the roughly polymerizable substance-containing liquid include a (meth) acrylic acid-containing solution obtained by condensing a (meth) acrylic acid-containing gas obtained by a catalytic gas phase oxidation reaction, and a contact gas phase oxidation reaction.
- (Meth) acrylic acid obtained by collecting (meth) acrylic acid-containing gas with a solvent eg, water, organic acid-containing water, high boiling inert hydrophobic organic liquid (eg, diphenyl ether, diphenyl, etc.)]
- a solvent eg, water, organic acid-containing water, high boiling inert hydrophobic organic liquid (eg, diphenyl ether, diphenyl, etc.)
- examples thereof include partially containing (meth) acrylic acid obtained by purifying the containing solution and these (meth) acrylic acid-containing solutions. More specifically, it is obtained by purifying a bottom stream or a column side stream, such as a collection tower, a condensation tower, a distillation tower, etc., and further purifying the bottom stream or the column side stream in a distillation and / or crystallization step (meta ) Acrylic acid-containing solution.
- the crude easily polymerizable substance-containing liquid contains acrylic acid and components by-produced by a catalytic gas phase oxidation reaction (for example, water, acetic acid, maleic acid, aldehyde). A polymer for collecting the acrylic acid-containing gas, and the like.
- a catalytic gas phase oxidation reaction for example, water, acetic acid, maleic acid, aldehyde.
- the easily polymerizable substance is methacrylic acid or a methacrylic ester
- the crude easily polymerizable substance-containing liquid contains methacrylic acid, a component by-produced by catalytic gas phase oxidation reaction (for example, methacrolein, acetic acid, etc.), And the solvent for collecting said methacrylic acid containing gas etc. may be contained.
- the coarsely polymerizable substance-containing liquid may contain a polymerization inhibitor.
- a polymerization inhibitor Phenolic compounds such as hydroquinone, methoxyhydroquinone, methoquinone, cresol, phenol, t-butylcatechol; Aromatic amines such as diphenylamine and p-phenylenediamine; Phenothiazine compounds such as phenothiazine and methylene blue; Copper salt compounds such as copper dialkyldithiocarbamate (for example, copper dimethyldithiocarbamate, copper diethyldithiocarbamate, copper dibutyldithiocarbamate) and copper salicylate, copper acetate, copper naphthenate, copper acrylate, copper sulfate, copper nitrate, copper chloride ; Manganese salt compounds such as manganese acetate; N-oxyl compounds such as 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxy
- polymerization inhibitors can be used suitably.
- the above compounds can be used alone or in combination of two or more.
- the addition method of these polymerization inhibitors is not specifically limited, For example, you may add directly in the form of solid or powder, (meth) acrylic acid, (meth) acrylic acid ester, water, an organic solvent, etc. It may be added in a form dissolved in an appropriate solvent. Further, the polymerization inhibitor may be dissolved in a process liquid such as a raw material liquid, a reflux liquid, or a collection liquid in each step.
- a low-boiling-point impurity outlet 22 and a reflux inlet 23 are present at the top of the distillation column 21, and a can outlet 26 for discharging the bottoms is present at the bottom of the tower 21.
- a processing liquid supply port 25 for connecting an introduction pipe for supplying the roughly polymerizable substance-containing liquid is present at an arbitrary position between the two.
- the reflux liquid inlet 23 is connected to a reflux liquid introduction pipe 24.
- the distillation tower may be a single distillation tower, a packed tower, a bubble bell tower, a perforated plate tower, or the like.
- a distillation column having a plurality of sieve trays or a distillation column having a packing is preferable. From the viewpoint of preventing the formation of a polymer, a multistage perforated plate tower is desirable.
- a reboiler 31 is used, and the type of the reboiler 31 is not particularly limited. However, when a multi-tube heat exchanger is used, a vertical multi-tube thermosiphon reboiler, a vertical multi-boiler is used. Examples thereof include a tubular liquid film flow-down multitubular reboiler and a forced circulation reboiler.
- Low boiling point impurities are discharged from the top of the distillation column.
- the low boiling point impurity means an impurity having a boiling point lower than that of the easily polymerizable substance.
- Examples of the low boiling point impurities include water, acetic acid, acrolein, methacrolein and the like.
- the “recovery unit” refers to a part below a processing liquid supply port that connects an introduction pipe for supplying a roughly polymerizable substance-containing liquid in a distillation column. Accordingly, in the distillation column 21 of FIG. 1, the portion below the processing liquid supply port 25 connecting the introduction pipe for supplying the roughly polymerizable substance-containing liquid corresponds to the recovery unit.
- the “bottom liquid” is a liquid containing a solid insoluble matter such as a polymer of an easily polymerizable substance discharged from the bottom of the distillation column, and an easily polymerizable substance as other components, and It contains a high boiling point component in the liquid containing the roughly polymerizable material. Therefore, in FIG. 1, the liquid extracted from the can outlet 26 connected to the recovery part of the distillation column 21 corresponds to the bottom liquid.
- the “solid insoluble matter” refers to a polymer produced by polymerization of solids and / or easily polymerizable substances caused by impurities contained in a liquid containing a roughly easily polymerizable substance. It is insoluble in the liquid. Of the polymers, those having a low degree of polymerization may have the property of being dissolved in the bottoms. On the other hand, a polymer having a high degree of polymerization becomes an insoluble polymer having an insoluble property that does not dissolve in the bottoms.
- the solid insoluble matter also includes insoluble components such as a carbide obtained by carbonizing a polymer of these easily polymerizable substances by heat or the like. The bottoms extracted from the distillation tower is transferred to a first separation step described later.
- the bottoms extracted from the recovery section of the distillation column 21 is introduced into a wet cyclone 29, and a solid containing the first purified easily polymerizable substance-containing liquid and the solid insoluble matter. Separated into insoluble matter-containing liquid.
- a polymer of an easily polymerizable substance that is a solid insoluble matter is contained in the bottoms discharged from the recovery section of the distillation column.
- the solid insoluble matter can be separated without allowing the bottoms to pass through a filter as in the prior art. Work costs and workload can be reduced.
- the wet cyclone is an apparatus that separates solid particles from a fluid containing solid particles in a suspended state (hereinafter also referred to as “particle suspension fluid”) using centrifugal force.
- particle suspension fluid a fluid containing solid particles in a suspended state
- 2A and 2B are schematic diagrams showing typical examples of wet cyclones preferably used in the present invention.
- the wet cyclone that can be used in the present invention is not limited to the illustrated type.
- the wet cyclone includes an introduction part 2 for introducing a particle suspension fluid, a cylindrical entrance / exit part 3, a hopper part 4 adjacent to the lower part of the entrance / exit part 3, and a discharge part 5 adjacent to the upper part of the entrance / exit part 3.
- the particle suspension fluid is in particular a bottoms. The bottoms are introduced in a tangential direction with respect to the entrance / exit 3 through the introduction part 2, and become a high-speed swirling flow in the cylindrical entrance / exit 3.
- the “solid insoluble matter-containing liquid” refers to a liquid separated by a wet cyclone and containing a solid insoluble matter having a large particle size at a high concentration.
- the solid insoluble matter-containing liquid contains a large part of the solid insoluble matter in the bottoms.
- the solid insoluble matter having a particle size of 450 ⁇ m or more is highly concentrated. It is preferable that it is contained.
- solid insoluble matter such as a polymer having a relatively small particle size and a small specific gravity moves to the discharge portion 5 along the upward flow.
- solid insoluble matters such as a polymer
- the mass of the polymer increases as the particle size of the solid insoluble matter, in particular, the polymer increases, the polymer having a relatively large particle size is included in the solid insoluble matter-containing liquid.
- the upper discharge port 6 is present in the wet cyclone discharge unit 5, and an upper discharge pipe (not shown) is connected to the upper discharge port 6.
- the hopper 4 of the wet cyclone has a lower discharge port 8, and a lower discharge pipe (not shown) is connected to the lower discharge port 8. From the upper outlet 6, the first purified easily polymerizable substance-containing liquid obtained after the first separation step is discharged. The solid insoluble matter-containing liquid is discharged out of the wet cyclone through the lower discharge port 8.
- the valve 9 provided at the lower portion of the hopper portion 4 may be opened.
- the “first purified easily polymerizable substance-containing liquid” refers to a liquid separated by a wet cyclone and obtained from an upper outlet of the wet cyclone.
- the first purified easily polymerizable substance-containing liquid may contain a solid insoluble substance at a low concentration.
- the introduction part 2 is preferably a cylindrical tube.
- the pipe diameter a of the introduction part 2 is preferably 40 mm or more, more preferably 45 mm or more, preferably 100 mm or less, and more preferably 80 mm or less.
- the “tube diameter” means the inner diameter and diameter of the tube.
- the entry / exit part 3 is also preferably a cylindrical tube, and the tube diameter d of the entry / exit part 3 is preferably 120 mm or more, more preferably 150 mm or more, preferably 300 mm or less, more preferably 250 mm or less.
- the length h of the entrance / exit portion 3 is preferably 50 mm or more, more preferably 70 mm or more, preferably 150 mm or less, and more preferably 120 mm or less.
- the hopper portion 4 is cylindrical, but the shape of the hopper portion 4 is not limited to this, and may be conical, for example. Moreover, the configuration of the hopper unit 4 may be two or more. When the hopper portion 4 has a two-stage configuration, an upper hopper portion adjacent to the entrance / exit portion 3 and a lower hopper portion adjacent to the lower discharge port 8 may be provided, and the upper hopper portion is cylindrical, The lower hopper may be conical. Further, the hopper portion 4 may have a three-stage configuration.
- the hopper portion 4 When the hopper portion 4 has a three-stage configuration, an upper hopper portion adjacent to the entrance / exit portion 3, a lower hopper portion adjacent to the lower discharge port 8, and an upper hopper portion; An intermediate hopper may be provided between the lower hopper, the upper hopper and the intermediate hopper may be cylindrical, and the lower hopper may be conical.
- the length of the hopper part 4 is preferably 800 mm or more, more preferably 820 mm or more, preferably 1500 mm or less, and more preferably 1200 mm or less. Further, the length of the hopper part 4 is preferably 2 times or more, more preferably 5 times or more, preferably 12 times or less, more preferably 10 times or less with respect to the length h of the entrance / exit part 3.
- the tube diameter of the hopper portion 4 is not particularly limited, and the maximum diameter is preferably 50 mm or more, more preferably 70 mm or more, and preferably 300 mm or less, more preferably 200 mm or less, whether cylindrical or conical. preferable.
- the maximum diameter of the hopper portion 4 is preferably 0.3 times or more, more preferably 0.4 times or more, and preferably 0.9 times or less, more preferably 0.9 times the tube diameter d of the entrance / exit portion 3. 7 times or less.
- the pipe diameter of the cone-shaped hopper part 4 becomes small toward the lower discharge port 8 from the entrance / exit part 3, and the pipe diameter in the bottom part of the hopper part 4 is preferably 20 mm or more and 200 mm or less, for example. .
- the tube diameter b of the upper outlet 6 in the discharge part 5 is preferably 40 mm or more, more preferably 50 mm or more, preferably 120 mm or less, more preferably 100 mm or less.
- the length H of the wet cyclone is preferably 900 mm or more, more preferably 1000 mm or more, preferably 1800 mm or less, more preferably 1700 mm or less.
- the length H of the wet cyclone is preferably 2 times or more, more preferably 7 times or more, preferably 15 times or less, more preferably 13 times or less with respect to the length h of the entrance / exit portion 3.
- the first purified easily polymerizable substance-containing liquid contains a large amount of solid insoluble matter having a particle size of 450 ⁇ m or more
- generation of new polymer or blockage of piping / equipment, etc. May be induced. Therefore, in the wet cyclone, solid insoluble matter having a relatively large particle size is separated as a solid insoluble matter-containing liquid, thereby suppressing the generation of new solid insoluble matter and efficiently generating the solid insoluble matter already produced. It is desirable to remove well.
- the removal rate of solid insoluble matters having a particle size of 450 ⁇ m or more is, for example, preferably 90% or more, more preferably 95% or more, and further preferably 98% or more.
- the “removal rate of solid insoluble matter having a particle size of 450 ⁇ m or more” means the total weight of solid insoluble matter having a particle size of 450 ⁇ m or more in the solid insoluble matter-containing liquid / the particle size of 450 ⁇ m or more in the bottoms.
- the particle size of a solid insoluble matter can be measured with a laser diffraction type particle size distribution analyzer, for example.
- the rate at which the bottoms are introduced into the wet cyclone is preferably 0.1 m ⁇ s ⁇ 1 or more, more preferably 0.3 m ⁇ s ⁇ 1 or more, and 2.0 m ⁇ s ⁇ 1 or less. Is more preferable, and 1.5 m ⁇ s ⁇ 1 or less is more preferable.
- the pressure loss of the wet cyclone decreases as the cross-sectional area of the introduction portion 2 increases, and increases as the length H of the wet cyclone increases.
- the pressure loss of the wet cyclone is preferably 1 to 50 kPa.
- the wet cyclone should be installed on the piping in the flow direction of the bottoms.
- the temperature of the bottoms recovered from the recovery part of the distillation tower is, for example, higher than 70 ° C. and lower than 120 ° C., preferably 80 ° C. or higher and 110 ° C. or lower.
- the bottoms recovered from the recovery unit of the distillation column may be temporarily transferred to a storage device such as a tank before being introduced into the wet cyclone.
- a storage device since the cooling operation or the like is not normally performed, the temperature of the bottoms introduced into the wet cyclone is almost the same as the temperature of the bottoms recovered from the distillation tower, that is, higher than 70 ° C and 120 ° C. It is less than 80 degreeC or less 110 degrees C or less more preferably.
- the solid insoluble matter-containing liquid may be continuously discharged through the lower discharge pipe of the wet cyclone, or may be discharged intermittently by opening and closing a valve installed in the lower discharge pipe of the wet cyclone.
- the polymerization reaction of the easily polymerizable substance may proceed due to the solid insoluble matter temporarily held at the lower part of the wet cyclone, and in some cases, it is necessary to stop the apparatus for cleaning, There is a possibility that the loss of acrylic acid increases and the purification efficiency deteriorates. Therefore, in the present invention, the former mode in which the solid insoluble matter-containing liquid is continuously discharged through the lower discharge pipe of the wet cyclone is preferable.
- the flow rate of the solid insoluble matter-containing liquid discharged through the lower discharge pipe is preferably 0.1% or more, more preferably 1% or more, further preferably 2% or more of the bottomed liquid per unit time. It is preferably 10% or less, more preferably 5% or less.
- the easily polymerizable substance in the first purified easily polymerizable substance-containing liquid may be further purified by an operation such as distillation and then commercialized.
- Second Separation Step In the present invention, after the first separation step, at least a part of a solid insoluble matter such as a polymer of a readily polymerizable substance present in the solid insoluble matter-containing liquid is further separated to obtain a second refining ease. It is preferable to perform a second separation step for obtaining a polymerizable substance-containing liquid. By removing the solid insoluble matter in the solid insoluble matter-containing liquid, the easily polymerizable substance remaining in the solid insoluble matter-containing liquid can be efficiently recovered.
- a solid insoluble matter such as a polymer of a readily polymerizable substance present in the solid insoluble matter-containing liquid is further separated to obtain a second refining ease. It is preferable to perform a second separation step for obtaining a polymerizable substance-containing liquid.
- the method for separating at least a part of the solid insoluble matter such as the polymer from the solid insoluble matter-containing liquid in the second separation step is not particularly limited as long as the solid and the liquid can be separated into solid and liquid.
- solid-liquid separation means 30 such as gravity sedimentation method, filtration method, cyclone method and the like can be mentioned, and a plurality of these solid-liquid separation means may be used in combination.
- the gravity settling method is preferable for the second separation step because the operation cost is low, the filter is not clogged with solid insoluble matter, and the cleaning work is small.
- a gravity settling tank may be used.
- the gravity settling tank preferably has a capacity of 30L or more, more preferably 40L or more, preferably 100L or less, more preferably 80L or less. It is preferable that the horizontal projection area of the gravitational settling tank is 0.03 m 2 or more, more preferably 0.05 m 2 or more, preferably 0.15 m 2 or less, more preferably is 0.1 m 2 or less .
- the residence time of the solid insoluble matter-containing liquid in the gravity settling tank is likely to cause a polymerization reaction of the easily polymerizable substance in the gravity settling tank, it is preferably 48 hours or less, more preferably from the viewpoint of preventing polymerization. 20 hours or less.
- the residence time of the solid insoluble matter-containing liquid is preferably 5 hours or longer, more preferably 10 hours or longer. If the residence time is too short, the solid insoluble matter does not sufficiently settle, and the solid insoluble matter separation efficiency may be lowered.
- a strainer, a pole filter, a wire mesh or the like may be used.
- the filtration method is preferable because only the solid insoluble matter having a large diameter can be removed and most of the liquid can be recovered.
- the amount of the solid insoluble matter-containing liquid is small with respect to the bottoms, it is possible to reduce the size of the wire mesh or the like to be used even if a filtration method is employed. Therefore, compared with the case where the bottoms themselves are filtered through a wire mesh or the like, the load during washing and the loss of easily polymerizable substances can be reduced.
- the filter in the filtration method is preferably a network structure, and the number of meshes of the network structure is preferably 20 mesh or more, more preferably 30 mesh or more, preferably 60 mesh or less, more preferably 50 mesh. It is as follows.
- the mesh structure has a mesh opening of preferably 1 mm or less, more preferably 0.8 mm or less, still more preferably 0.5 mm or less, preferably 0.1 mm or more, more preferably 0.2 mm or more. Further, the opening ratio of the network structure is preferably 20% or more, more preferably 25% or more, further preferably 30% or more, preferably 65% or less, more preferably 60% or less, and still more preferably 55. % Or less.
- the wet cyclone described above may be used.
- the discharge valve below the cyclone may be open or closed.
- Circulation Step it is preferable to carry out a circulation step of introducing the second purified easily polymerizable substance-containing liquid into the distillation column. Since the second purified easily polymerizable substance-containing liquid contains an easily polymerizable substance and a polymerization inhibitor, the second purified easily polymerizable substance-containing liquid is introduced into the distillation column so that the easily polymerizable substance is contained. Loss and purification cost can be reduced.
- the solid-liquid separation method in the second separation step is a gravity sedimentation method
- the supernatant liquid may be introduced into a distillation column.
- adopting the filtration method it is good to introduce the filtrate after filtration into a distillation column.
- Example 1 As a distillation column, a distillation column equipped with a stainless steel non-weir perforated plate having an inner diameter of 2200 mm and 50 stages was used, and a rectification operation of the crude acrylic acid-containing liquid was performed. At the top of the distillation column, there are an outlet for low-boiling impurities and a reflux inlet (the reflux inlet is connected to the reflux inlet), and the bottom is discharged from the bottom. A circulation outlet for circulating the second purified easily polymerizable substance-containing liquid and a position between the top of the tower and the bottom of the tower to supply the crude easily polymerizable substance-containing liquid. There is a treatment liquid supply port for connecting the introduction pipe.
- a tank for temporarily storing the bottoms, a pump for feeding the liquid, and a wet cyclone were disposed in the piping for bottoms.
- a natural circulation type reboiler vertical multi-tube type in which the fluid passes through the tube side was disposed. From the bottom of the distillation column, an acrylic acid-containing liquid as a bottom was withdrawn so that the flow rate of the bottom was 10,000 kg / h. The temperature of the bottoms was 100 ° C., and the density of the bottoms was about 1000 kg / m 3 .
- the bottoms were temporarily stored in a tank and transferred to a wet cyclone (“Filstar (registered trademark)” manufactured by Industria Co., Ltd.) using a pump for feeding liquid.
- a wet cyclone (“Filstar (registered trademark)” manufactured by Industria Co., Ltd.)
- the speed of the bottoms introduced into the wet cyclone was 0.98 m ⁇ s ⁇ 1 .
- a first purified acrylic acid-containing liquid was obtained from the upper part of the wet cyclone, and a solid insoluble matter-containing liquid containing a polymer or the like was obtained from the lower part of the wet cyclone.
- the opening degree of the valve installed at the lower discharge port of the wet cyclone was adjusted so that the discharge amount of the solid insoluble matter-containing liquid was 300 kg / h.
- Example 2 The solid insoluble matter-containing liquid discharged from the wet cyclone was passed through a 40-mesh strainer to remove the solid insoluble matter, and the second purified acrylic acid-containing liquid after passing through the strainer was returned to the distillation column. The operation was performed in the same manner as in Example 1. The operation was continued in this state, and the operation was performed for 8000 hours per year. Meanwhile, clogging of the wet cyclone did not occur and cleaning was unnecessary. Moreover, the frequency
- Example 3 The strainer disposed in the liquid feed line of the solid insoluble matter-containing liquid in Example 2 was replaced with a gravity sedimentation tank having a capacity of 50 L and a horizontal projection area of 0.07 m 2 , and the supernatant was adjusted so as to be returned to the distillation column. .
- the gravity sedimentation tank was replaced with the second purified acrylic acid-containing liquid once every two days. The operation was continued in this state, and the operation was continued for 8000 hours per year. Meanwhile, clogging of the wet cyclone did not occur and cleaning was unnecessary. Moreover, since the gravity settling tank was introduced, it was not necessary to wash the gravity settling tank. In addition, the total amount of acrylic acid loss in operation for 8000 hours was about 1.8 tons.
- Example 4 In Example 2, the equipment and conditions were the same as in Example 1 except that the discharge amount of the solid insoluble matter-containing liquid was changed from 300 kg / h to 90 kg / h by adjusting the valve opening degree of the lower outlet of the wet cyclone. Drove. As a result, about 2000, 4000, and 6000 hours after the start of operation (3 times in total), the wet cyclone lower outlet was confirmed to be clogged with the polymer. In order to eliminate clogging due to this polymer, the line was switched to bypass, the wet cyclone lower outlet was washed, and then the line was returned to its original position. The total loss of acrylic acid after 8000 hours of operation was about 4.8 tons.
- Comparative Example 1 Except that a 40-mesh strainer was installed instead of the wet cyclone, the operation was performed using the same equipment as in Example 1 and operated for 8000 hours per year. The number of times the strainer was washed was 1024 times / year. . The total loss of acrylic acid after 8000 hours of operation was about 25 tons.
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Abstract
Description
しかし、本発明者らは前記課題を解決するために鋭意研究を重ねた結果、細い配管径を有する湿式サイクロンを用いることで、上記従来の知見に反して、高温の缶出液中に含まれる固形不溶物を分離するとともに、清掃作業等の繁雑さを改善し、効率よく易重合性物質を精製することができることを見出し、本発明を完成した。
湿式サイクロンでは粒径450μm以上の固形不溶物を分離し、粒径450μm以上の固形不溶物の除去率が90%以上であることが好ましい。また、湿式サイクロンに導入する際の缶出液の速度は0.1m・s-1以上2.0m・s-1以下であることが望ましい。更に、湿式サイクロンに導入される缶出液の温度は70℃より高く120℃未満であることが好ましい。加えて、固形不溶物含有液の流量は、単位時間あたり、缶出液の10%以下であることが望ましい。
また本発明は、前記固形不溶物含有液中に存在する固形不溶物の少なくとも一部を分離して第2精製易重合性物質含有液を得る第2分離工程を含むことが好ましい。湿式サイクロンを用いて分離した固形不溶物含有液を、更に第2分離工程に付すことにより、固形不溶物含有液中に残存する易重合性物質を効率よく回収することができる。
また本発明では、前記第2精製易重合性物質含有液を、前記蒸留塔に導入する循環工程を含むことがより好ましい。本構成により、第2精製易重合性物質含有液中に残存する易重合性物質をより効率よく回収することが可能となる。
更に本発明では、前記易重合性物質は、アクリル酸、メタクリル酸、アクリル酸エステル、またはメタクリル酸エステルであることがより好ましい態様である。
上記不飽和カルボン酸とエステル体を構成することのできる水酸基含有化合物としては、例えば、炭素数1以上12以下の脂肪族アルコール又は脂環式アルコールが挙げられ、このような水酸基含有化合物としては、メタノール、エタノール、n-ブタノール、イソブタノール、sec-ブタノール、t-ブタノール、1-ペンタノール、2-ペンタノール、3-ペンタノール、シクロペンタノール、1-ヘキサノール、2-ヘキサノール、3-ヘキサノール、シクロヘキサノール、1-ヘプタノール、2-ヘプタノール、3-ヘプタノール、1-オクタノール、イソオクタノール、2-エチルヘキサノール、イソノニルアルコール、ラウリルアルコール等の一価アルコール;エチレングリコール、1,3-プロパンジオール等の多価アルコール;等を挙げることができ、これらは直鎖状のものであっても分岐を有するものであってもよい。また、これらは1種を単独で、または2種以上を併用して用いてもよい。
好ましい易重合性物質は、アクリル酸、メタクリル酸、アクリル酸エステル、またはメタクリル酸エステルであり、より好ましくはアクリル酸、メタクリル酸、アクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸2-エチルヘキシル、アクリル酸2-ヒドロキシエチル、アクリル酸2-ヒドロキシプロピル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチル、メタクリル酸2-エチルヘキシル、メタクリル酸2-ヒドロキシエチルまたはメタクリル酸2-ヒドロキシプロピルであり、更に好ましくはアクリル酸またはメタクリル酸である。
ハイドロキノン、メトキシハイドロキノン、メトキノン、クレゾール、フェノール、t-ブチルカテコール等のフェノール化合物;
ジフェニルアミン、p-フェニレンジアミン等の芳香族アミン類;
フェノチアジン、メチレンブルー等のフェノチアジン化合物;
ジアルキルジチオカルバミン酸銅(例えば、ジメチルジチオカルバミン酸銅、ジエチルジチオカルバミン酸銅、ジブチルジチオカルバミン酸銅)及びサリチル酸銅、酢酸銅、ナフテン酸銅、アクリル酸銅、硫酸銅、硝酸銅、塩化銅等の銅塩化合物;
酢酸マンガン等のマンガン塩化合物;
4-ヒドロキシ-2,2,6,6-テトラメチルピペリジン-1-オキシル等のN-オキシル化合物;
N-ニトロソフェニルヒドロキシルアミンおよびそのアンモニウム塩や、p-ニトロソフェノール、N-ニトロソジフェニルアミン等のニトロソ化合物;
N-ヒドロキシ-2,2,6,6-テトラメチルピペリジン、2,2,6,6-テトラメチルピペリジン等のピペリジン化合物;
尿素及び尿素誘導体等の尿素類;
チオ尿素及びチオ尿素誘導体等のチオ尿素類;
等を好適に用いることができる。上記の化合物は単独でも、あるいは2種類以上組み合わせて使用することもできる。これら重合禁止剤の添加方法は特に限定されず、例えば、固体又は粉体等の形で直接添加してもよいし、(メタ)アクリル酸、(メタ)アクリル酸エステル、水、有機溶剤、等の適当な溶剤に溶解した形で添加してもよい。また、重合禁止剤は、各工程の原料液、還流液、捕集液等のプロセス液に溶解してもよい。
第1分離工程では、前記蒸留塔21の回収部から抜き出される缶出液を湿式サイクロン29に導入し、第1精製易重合性物質含有液と前記固形不溶物を含有する固形不溶物含有液とに分離する。固形不溶物である易重合性物質の重合物等は、蒸留塔の回収部から排出される缶出液に含まれる。本発明では、抜き出した缶出液から固形不溶物を分離する際に湿式サイクロンを用いることにより、従来のように缶出液をフィルターに通過させることなく固形不溶物を分離できるため、清掃に要する作業コスト・作業負荷を低減することができる。
ホッパ部4の長さは、例えば、800mm以上が好ましく、820mm以上がより好ましく、1500mm以下が好ましく、1200mm以下がより好ましい。またホッパ部4の長さは、出入り部3の長さhに対し、2倍以上が好ましく、より好ましくは5倍以上であり、12倍以下が好ましく、より好ましくは10倍以下である。
またホッパ部4の管径は特に限定されるものではなく、円筒状又は円錐状のいずれも、最大径は50mm以上が好ましく、より好ましくは70mm以上であり、300mm以下が好ましく、200mm以下がより好ましい。ホッパ部4の最大径は、出入り部3の管径dに対し、0.3倍以上が好ましく、より好ましくは0.4倍以上であり、0.9倍以下が好ましく、より好ましくは0.7倍以下である。
また円錐状のホッパ部4は、出入り部3から下部排出口8に向けて、管径が小さくなることが好ましく、ホッパ部4の底部における管径は、例えば、好ましくは20mm以上200mm以下である。
なお固形不溶物の粒径は、例えば、レーザー回折式粒度分布測定装置で測定することができる。
本発明では、第1分離工程の後に、更に前記固形不溶物含有液中に存在する易重合性物質の重合物等の固形不溶物の少なくとも一部を分離して第2精製易重合性物質含有液を得る第2分離工程を行うことが好ましい。固形不溶物含有液中の固形不溶物を除去することにより、固形不溶物含有液中に残存する易重合性物質を効率よく回収することができる。
濾過法におけるフィルターは網状構造体であることが好ましく、網状構造体の網目数は、好ましくは20メッシュ以上が好ましく、より好ましくは30メッシュ以上であり、60メッシュ以下が好ましく、より好ましくは50メッシュ以下である。
また網状構造体の目開きは、1mm以下が好ましく、より好ましくは0.8mm以下、更に好ましくは0.5mm以下であり、0.1mm以上が好ましく、より好ましくは0.2mm以上である。
更に網状構造体の開口率は、20%以上が好ましく、より好ましくは25%以上であり、更に好ましくは30%以上であり、65%以下が好ましく、より好ましくは60%以下、更に好ましくは55%以下である。
なお「網状構造体の網目数(単位:メッシュ)」は、1インチ(25.4mm)間における目数を表し、例えば、下記式(1)で求められる。
網目数(メッシュ)=25.4/(A+W) …(1)
また「網状構造体の開口率(単位:%)」は、例えば、下記式(2)で求められる。
開口率(%)={A/(A+W)}2×100 …(2)
(式(1)及び式(2)中、Aは目開き(mm)、Wは網状構造体の線径(mm)を表す。)
また本発明では、前記第2精製易重合性物質含有液を、前記蒸留塔に導入する循環工程を実施することが好ましい。第2精製易重合性物質含有液には、易重合性物質や重合禁止剤が含まれているため、前記第2精製易重合性物質含有液を前記蒸留塔に導入することで易重合性物質のロスを低減できるとともに精製コストを下げることが可能となる。前記第2分離工程での固液分離方法が重力沈降法の場合は、上澄み液を蒸留塔に導入するとよい。また濾過法を採用する場合には、濾過後の濾液を蒸留塔に導入するとよい。
蒸留塔として、内径2200mm、段数50段のステンレス製の無堰多孔板を内装した蒸留塔を用い、粗アクリル酸含有液の精留操作を実施した。前記蒸留塔の塔頂部には、低沸点不純物の取出口及び還流液導入口(該還流液導入口は還流液導入管に繋がっている)が存在し、塔底部には、缶出液を排出するための缶出口、及び第2精製易重合性物質含有液を循環するための循環口が存在し、塔頂部と塔底部の間の位置には、粗易重合性物質含有液を供給するための導入配管を接続する処理液供給口が存在する。また缶出液用の配管には、缶出液を一時的に貯蔵するためのタンク、送液用ポンプ、湿式サイクロンを配設した。また蒸留塔には、自然循環型で流体が管側を通過するリボイラー(縦型多管式)を配設した。蒸留塔の塔底部からは缶出液としてのアクリル酸含有液を抜き出し、その缶出液の流量が10,000kg/hとなるようにした。なお缶出液の温度は100℃であり、缶出液の密度は、約1000kg/m3であった。
缶出液は、一時的にタンクに貯蔵し、送液用ポンプにより湿式サイクロン(インダストリア社製「フィルスター(登録商標)」)に移送した。この時、湿式サイクロンに導入する缶出液の速度は、0.98m・s-1であった。湿式サイクロンの上部からは第1精製アクリル酸含有液を、湿式サイクロンの下部からは重合物等を含む固形不溶物含有液を取得した。本実施例では、固形不溶物含有液の排出量が300kg/hとなるように湿式サイクロンの下部排出口に設置されたバルブの開度を調節した。本実施例では、湿式サイクロンにより、缶出液に含まれる粒径450μm以上の固形不溶物の100%を、固形不溶物含有液に回収することができた。なお図2A及び図2Bに示す湿式サイクロンの寸法は、以下の通りであった。
・導入部2の管径a;60mm
・出入り部3の管径d;170mm、長さh;105mm
・ホッパ部4の形状;円筒状、管径D;95mm、長さ880mm
・排出部5の上部排出口6の管径b;60mm
・湿式サイクロンの長さH;1124mm
湿式サイクロン下部より排出される固形不溶物含有液は、別に用意した貯蔵用タンクに移送した。移送された固形不溶物含有液からは、必要に応じて、アクリル酸を回収した。
このような状態で運転を続けて年間8000時間稼働した。その間、湿式サイクロンの詰まり等は起こらず、洗浄は不要であった。8000時間の稼働におけるアクリル酸のロスの総量は約24トンであった。
湿式サイクロンより排出される固形不溶物含有液を、40メッシュのストレーナーに通して固形不溶物を除去し、ストレーナーを通過した後の第2精製アクリル酸含有液を蒸留塔に返送した以外は、実施例1と同様の方法で運転を行った。
このような状態で運転を続けて年間8000時間稼働した。その間、湿式サイクロンの詰まり等は起こらず、洗浄は不要であった。また、固形不溶物含有液の送液ラインに配設したストレーナーの洗浄回数は333回/年であった。なお、8000時間の稼働におけるアクリル酸のロスの総量は約2トンであった。
実施例2における固形不溶物含有液の送液ラインに配設したストレーナーを、容量50L、水平投影面積0.07m2の重力沈降槽に替えて、上澄み液を蒸留塔に返送するように調整した。前記重力沈降槽は2日に1回の頻度で第2精製アクリル酸含有液の入れ替えを行った。
このような状態で運転を続け年間8000時間稼働した。その間、湿式サイクロンの詰まり等は起こらず、洗浄は不要であった。また、重力沈降槽を導入したことにより重力沈降槽の洗浄も不要であった。なお、8000時間の稼働におけるアクリル酸のロスの総量は約1.8トンであった。
実施例2において、固形不溶物含有液の排出量を湿式サイクロンの下部排出口のバルブ開度を調節して300kg/hから90kg/hに変更した以外は実施例1と同様の設備および条件にて運転を行った。その結果、運転開始から約2000、4000、6000時間後(計3回)に、湿式サイクロン下部出口部に重合物による詰まりを確認した。この重合物による詰まりを解消するために、ラインをバイパスに切り替え、湿式サイクロン下部出口部の洗浄を実施した後、再度ラインを元に戻した。8000時間の稼働におけるアクリル酸のロスの総量は約4.8トンであった。
湿式サイクロンの代わりに40メッシュのストレーナーを設置したこと以外は実施例1と同様の設備を用いて運転を行い、年間8000時間稼働させたところ、該ストレーナーの洗浄回数は1024回/年であった。8000時間の稼働におけるアクリル酸のロスの総量は約25トンであった。
3 出入り部
4 ホッパ部
5 排出部
6 上部排出口
8 下部排出口
9 バルブ
21 蒸留塔
22 低沸点不純物の取出口
23 還流液導入口
24 還流液導入管
25 処理液供給口
26 缶出口
27 循環口
28 送液用ポンプ
29 湿式サイクロン
30 固液分離手段
31 リボイラー
32 凝縮器
Claims (8)
- 易重合性物質の精製方法であって、
粗易重合性物質含有液を蒸留塔に導入し、
前記蒸留塔の回収部から抜き出される缶出液を湿式サイクロンに導入して、第1精製易重合性物質含有液と固形不溶物含有液とに分離する第1分離工程を含むことを特徴とする易重合性物質の精製方法。 - 湿式サイクロンでは粒径450μm以上の固形不溶物を分離し、
粒径450μm以上の固形不溶物の除去率が90%以上である請求項1に記載の易重合性物質の精製方法。 - 湿式サイクロンに導入する際の缶出液の速度が0.1m・s-1以上2.0m・s-1以下である請求項1または2に記載の易重合性物質の精製方法。
- 湿式サイクロンに導入される缶出液の温度が70℃より高く120℃未満である請求項1~3のいずれか1項に記載の易重合性物質の精製方法。
- 固形不溶物含有液の流量が、単位時間あたり、缶出液の10%以下である請求項1~4のいずれか1項に記載の易重合性物質の精製方法。
- 前記固形不溶物含有液中に存在する固形不溶物の少なくとも一部を分離して第2精製易重合性物質含有液を得る第2分離工程を含む請求項1~5のいずれか1項に記載の易重合性物質の精製方法。
- 前記第2精製易重合性物質含有液を、前記蒸留塔に導入する循環工程を含む請求項6に記載の易重合性物質の精製方法。
- 前記易重合性物質が、アクリル酸、メタクリル酸、アクリル酸エステル、またはメタクリル酸エステルである請求項1~7のいずれか1項に記載の易重合性物質の精製方法。
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EP (1) | EP3228612B1 (ja) |
JP (1) | JP6259533B2 (ja) |
CN (1) | CN107001229B (ja) |
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JP2001129388A (ja) * | 1999-11-08 | 2001-05-15 | Nippon Shokubai Co Ltd | 塔式処理方法および装置 |
JP2003103105A (ja) * | 2001-09-28 | 2003-04-08 | Sumitomo Chem Co Ltd | 易重合性物質の蒸留方法およびこれに使用する蒸留装置 |
JP2003103161A (ja) * | 2001-09-28 | 2003-04-08 | Nippon Shokubai Co Ltd | 低熱伝導性材料が付設されている精製装置 |
JP2003164701A (ja) * | 2001-11-30 | 2003-06-10 | Mitsubishi Chemicals Corp | 重合性化合物の精製用蒸留塔の底部構造及びこれを使用した重合性化合物の製造方法 |
JP2007217403A (ja) * | 2006-01-20 | 2007-08-30 | Nippon Shokubai Co Ltd | アクリル酸の精製方法および製造方法 |
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JP2013203712A (ja) * | 2012-03-29 | 2013-10-07 | Mitsubishi Chemicals Corp | (メタ)アクリル酸又は(メタ)アクリル酸エステルの製造方法 |
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JP4593725B2 (ja) * | 2000-04-14 | 2010-12-08 | 株式会社日本触媒 | 易重合性物質の製造方法および精製塔 |
JP4673958B2 (ja) * | 2000-06-19 | 2011-04-20 | 株式会社日本触媒 | 固形物除去装置 |
DE102004034316B4 (de) * | 2004-07-15 | 2015-07-16 | Evonik Degussa Gmbh | Ein Verfahren zur Herstellung von (Meth)Acrylsäure |
DE602007005288D1 (de) * | 2006-01-20 | 2010-04-29 | Nippon Catalytic Chem Ind | Verfahren zur Reinigung von Acrylsäure |
-
2015
- 2015-11-20 SG SG11201704540YA patent/SG11201704540YA/en unknown
- 2015-11-20 US US15/532,723 patent/US20170354900A1/en not_active Abandoned
- 2015-11-20 CN CN201580065423.4A patent/CN107001229B/zh active Active
- 2015-11-20 EP EP15864552.3A patent/EP3228612B1/en active Active
- 2015-11-20 JP JP2016562383A patent/JP6259533B2/ja active Active
- 2015-11-20 WO PCT/JP2015/082681 patent/WO2016088578A1/ja active Application Filing
- 2015-11-25 TW TW104139084A patent/TWI652258B/zh active
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JP2001129388A (ja) * | 1999-11-08 | 2001-05-15 | Nippon Shokubai Co Ltd | 塔式処理方法および装置 |
JP2003103105A (ja) * | 2001-09-28 | 2003-04-08 | Sumitomo Chem Co Ltd | 易重合性物質の蒸留方法およびこれに使用する蒸留装置 |
JP2003103161A (ja) * | 2001-09-28 | 2003-04-08 | Nippon Shokubai Co Ltd | 低熱伝導性材料が付設されている精製装置 |
JP2003164701A (ja) * | 2001-11-30 | 2003-06-10 | Mitsubishi Chemicals Corp | 重合性化合物の精製用蒸留塔の底部構造及びこれを使用した重合性化合物の製造方法 |
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Publication number | Publication date |
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US20170354900A1 (en) | 2017-12-14 |
TWI652258B (zh) | 2019-03-01 |
EP3228612A1 (en) | 2017-10-11 |
CN107001229A (zh) | 2017-08-01 |
TW201634436A (zh) | 2016-10-01 |
EP3228612B1 (en) | 2019-07-03 |
JP6259533B2 (ja) | 2018-01-10 |
JPWO2016088578A1 (ja) | 2017-07-06 |
SG11201704540YA (en) | 2017-07-28 |
EP3228612A4 (en) | 2018-05-23 |
CN107001229B (zh) | 2019-11-05 |
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