WO2011108420A1 - 塔型固液向流接触装置、固体粒子の洗浄装置、及び、方法 - Google Patents
塔型固液向流接触装置、固体粒子の洗浄装置、及び、方法 Download PDFInfo
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- WO2011108420A1 WO2011108420A1 PCT/JP2011/053994 JP2011053994W WO2011108420A1 WO 2011108420 A1 WO2011108420 A1 WO 2011108420A1 JP 2011053994 W JP2011053994 W JP 2011053994W WO 2011108420 A1 WO2011108420 A1 WO 2011108420A1
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- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/87—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis the receptacle being divided into superimposed compartments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
- B01J8/38—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
- B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/10—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by stirrers or by rotary drums or rotary receptacles or endless belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/12—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by gravity in a downward flow
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G75/02—Polythioethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
- C08L81/06—Polysulfones; Polyethersulfones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0418—Geometrical information
- B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00796—Details of the reactor or of the particulate material
- B01J2208/00823—Mixing elements
- B01J2208/00831—Stationary elements
- B01J2208/0084—Stationary elements inside the bed, e.g. baffles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00796—Details of the reactor or of the particulate material
- B01J2208/00823—Mixing elements
- B01J2208/00858—Moving elements
- B01J2208/00867—Moving elements inside the bed, e.g. rotary mixer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G2650/28—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type
- C08G2650/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group
- C08G2650/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group containing ketone groups, e.g. polyarylethylketones, PEEK or PEK
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
Definitions
- the present invention relates to a tower-type solid-liquid countercurrent contact device for countercurrently contacting solid particles and a liquid. More specifically, the present invention, in a tower-type solid-liquid countercurrent contact device in which a plurality of stirring chambers are arranged, suppresses a short path of solid particles and suppresses the retention of solid particles near the wall of the stirring chamber. Furthermore, the present invention relates to a tower-type solid-liquid countercurrent contact device that can improve the contact efficiency between the solid particles and the liquid by suppressing the backflow of the solid particles into the stirring chamber connected upward.
- the column-type solid-liquid countercurrent contact apparatus of the present invention can continuously and solidly flow a solid particle flow and a liquid flow for a sufficient time. It can be used for unit operations mainly in the chemical industry, such as extraction, impregnation, chemical reaction, and dissolution. Therefore, the present invention relates to a cleaning apparatus for bringing a solid particle such as polymer particles such as polyarylene sulfide (PAS) produced by polymerization into countercurrent contact with a cleaning liquid, and a polymer manufacturing apparatus.
- a cleaning apparatus for bringing a solid particle such as polymer particles such as polyarylene sulfide (PAS) produced by polymerization into countercurrent contact with a cleaning liquid, and a polymer manufacturing apparatus.
- PAS polyarylene sulfide
- solid-liquid contact devices are used to perform operations such as washing, purification, extraction, impregnation, chemical reaction, and dissolution by bringing a solid and a liquid into contact with each other.
- the solid-liquid contact device is also referred to as a tower-type solid-liquid counter-current contact device (“vertical solid-liquid counter-current contact device”) that continuously counter-contacts solid particles and liquid as an upward flow and a downward flow. )It has been known.
- the tower-type solid-liquid countercurrent contact device has an advantage that a large amount of processing is possible compared to other solid-liquid contact devices because the contact efficiency and processing capacity between solid particles and liquid are high.
- Patent Document 1 a raw material and a solvent are separated using a multistage extraction apparatus having an extraction apparatus main body, a partition between stages, a partition stirring blade, and a partition stirring shaft. Counterflow contact is disclosed.
- International Publication No. 2005/33058 Patent Document 2; corresponding to US Patent Application Publication No. 2007/0015935 and European Patent Application Publication No. 1669343 uses a tower having a plurality of stirring blades in the vertical direction. A process for the production of terephthalic acid with a flow contact operation is described.
- Patent Document 3 corresponding to US Patent Application Publication No. 2006/0254622 and European Patent Application Publication No. 1669140
- solid particles are supplied from the upper part of a vertical washing tank.
- a continuous cleaning method and apparatus for solid particles is described in which a high-concentration zone of solid particles is formed in a cleaning tank, and the mixture is agitated with a plurality of stirring blades and brought into countercurrent contact with the upward flow of the cleaning liquid.
- JP-T-2008-513186 (Patent Document 4; corresponding to International Publication No. 2006/030588) includes a plurality of stirring chambers that are partitioned from each other by a partition plate having a communication port and connected in the vertical direction.
- Each stirring chamber is provided with a radial discharge type stirring blade and one or more baffles fixed to the inner side wall, and a vertical solid-liquid countercurrent contact device provided with a solid inlet and a liquid inlet at the upper and lower parts.
- a vertical solid-liquid countercurrent contact device provided with a solid inlet and a liquid inlet at the upper and lower parts.
- the contact interface between the solid particles and the liquid is quickly updated by stirring with the stirring blade, and a plurality of partitioned chambers are provided. Are arranged in a vertical direction through a communication port, and each compartment is provided with a stirring blade, so that the solid particles after the contact treatment are settled by gravity into the next compartment which is continuously provided. It is moved and contact processing with a new liquid flowing from below is repeated.
- the contact efficiency between the solid particles and the liquid has not been sufficient. That is, in the compartment (hereinafter referred to as “stirring chamber”) provided with a stirring blade, the renewal speed of the contact interface between the solid particles and the liquid becomes uneven or after the contact treatment in the stirring chamber. Back-mixing occurs when the solid particles are not new liquid and contact with the liquid that has already been contacted with the solid particles, or the moving time of the solid particles from one stirring chamber to the stirring chamber connected below In some cases, the solid particles after the contact treatment in the stirring chamber pass through the communication port accompanying the upward flow of the liquid and flow back to the stirring chamber connected upward. There was also.
- the stirring blades used in the solid-liquid countercurrent contact device include flat paddle blades, inclined paddle blades, V-type paddle blades, fiddler blades, pull margin blades and other paddle blades, turbine blades, fan turbine blades and other turbine blades, marine Propeller wings such as propeller wings are known.
- paddle blades and turbine blades tend to generate a flow in the radial direction of the blades mainly due to the centrifugal action of the blade rotation, while propeller blades tend to generate a flow in the axial direction due to thrust in the rotational axis direction.
- the direction of the flow to be generated can be adjusted to some extent by changing the shape of the blade and the mounting angle.
- the stirring blade provided in the stirring chamber of the tower-type solid-liquid countercurrent contact device it is required that solid particles stay in the stirring chamber for a predetermined time to be in solid-liquid contact. If a propeller blade that generates a flow mainly in the axial direction is used as the stirring blade, the solid particles supplied from above are discharged from the stirring chamber in a relatively short time by the flow sent downward in the axial direction. The tendency to end up is strong. On the other hand, when a paddle blade or a turbine blade is used, solid particles can be retained in the stirring chamber for a relatively long time by a flow that rotates in the stirring chamber.
- the solid particles that are brought into solid-liquid contact in the stirring chamber gradually settle down due to the action of gravity, pass through the communication port, and are discharged into the stirring chamber provided below.
- the residence time of the solid particles in the stirring chamber can be adjusted by adjusting the shape, attachment angle, rotation speed, and the like of the paddle blade and the turbine blade.
- paddle blades and turbine blades are preferably used as the stirring blades provided in the stirring chamber of the tower-type solid-liquid countercurrent contact device, and among them, a substantially flat blade plate is projected radially on the rotating shaft.
- the paddle wings that are installed in a wide range are widely used because of their simple structure and low production and maintenance costs.
- the inventors of the present invention have made extensive studies on the occurrence mechanism of the above-mentioned disadvantageous phenomenon that occurs when the paddle blade is adopted as a stirring blade provided in a stirring chamber of a tower-type solid-liquid countercurrent contact device. As a result, the solid particles in the vicinity of the rotating shaft with the paddle blades fixed are discharged from the stirring chamber without receiving solid-liquid countercurrent contact for a sufficient time in the stirring chamber. I found the cause.
- a paddle blade is a stirring blade formed by projecting two to eight substantially flat blades at regular intervals radially on a rotating shaft. By rotating the rotating shaft in liquid, the paddle blade is mainly used in the radial direction. Causing the liquid to flow.
- almost all of the flat paddle blades in which flat blade blades are mounted so as to protrude in parallel with the axial direction of the rotating shaft have a radial flow.
- the ratio of the generated radial flow and the axial flow varies depending on the tilt angle, and in the fouler blade, the ratio of the axial flow increases. That is, the paddle blade can adjust the ratio of the radial flow and the axial flow generated in the stirring chamber by changing the shape, size, attachment angle, and the like of the blade plate.
- a liquid flow mainly in the radial direction is generated in the stirring chamber, so that the solid particles are not discharged from the stirring chamber in a short time, and the solid particles and the liquid are not discharged from the stirring chamber. It is possible to make contact while renewing the contact interface while staying at the point.
- the solid particles continue to settle gradually, pass through the communication port, and are discharged into the stirring chamber provided below.
- the solid particles gradually flow from the top to the bottom, while the liquid gradually flows from the bottom to the top, and solid-liquid countercurrent contact is performed.
- the rotation angular velocity of the blades increases in proportion to the distance from the rotation shaft.
- the rotational angular velocity of the substantially flat blade plate is small, the liquid flow in the radial direction and the circumferential direction is also reduced, and the movement of the solid particles in the radial direction and the circumferential direction is also reduced.
- the influence of the flow generated by the baffle provided on the inner wall surface of the tower main body and stirring up and down is small.
- the solid particles near the rotation axis are gradually settled by gravity in the stirring chamber with little influence from radial and circumferential liquid flow or liquid flow that is stirred up and down. To do.
- the solid particles near the rotating shaft pass through the communication port in the axial direction of the rotating shaft in a relatively short time without receiving solid-liquid countercurrent contact for a sufficient time in the stirring chamber. Therefore, it tends to be discharged into a stirring chamber connected downward.
- the solid-liquid countercurrent contact is again performed for a sufficient time in the stirring chamber.
- the present inventors generate a short path (S in FIG. 3) in which the solid-liquid countercurrent contact device receives almost no solid-liquid countercurrent contact and is discharged from the device. I found out.
- the present invention is a tower-type solid-liquid countercurrent contact device having a tower top, a tower main body, and a tower bottom, which are partitioned from each other by the respective annular partition plates having a communication port in the center, in the vertical direction.
- the column-type solid-liquid countercurrent contact device having a structure in which at least one baffle extending in the direction is disposed, a part of the solid particles does not receive sufficient solid-liquid countercurrent contact in the stirring chamber, and the stirring chamber Effectively prevents the occurrence of short paths that are discharged from the tower-type solid-liquid countercurrent contact device in a short time and promotes solid-liquid countercurrent contact by stirring, while the solid particles move upward Suppresses backflow into the connected stirring chamber,
- the present inventors have determined that in the tower-type solid-liquid countercurrent contact device, the tower body is partitioned from each other by the respective annular partition plates having a communication port in the center, and vertically.
- a paddle blade having a specific blade diameter and blade width is arranged in a plurality of continuous stirring chambers, and at least a part of a communication port located below the paddle blade is adjacent to the paddle blade.
- a tower-type solid-liquid countercurrent contact device for countercurrent-contacting solid particles having a tower top part, a tower body part, and a tower bottom part with a liquid, and communicated with the tower body part in the center.
- a plurality of stirring chambers that are partitioned from each other by an annular partition plate having a mouth and that are connected in the vertical direction are fixed to a common rotating shaft that passes through the communication port of each annular partition plate.
- a paddle wing with the following equations (1) and (2) Formula (1): (paddle blade diameter) / (stirring chamber diameter) ⁇ 0.65 Formula (2): (blade width of paddle blade) / (diameter of stirring chamber) ⁇ 0.10 And at least one baffle extending in the vertical direction along the inner wall surface of the tower body, and at least one of the communication ports located below the paddle blade A disk having a size covering the portion is adjacent to the paddle blade, and is attached to the rotating shaft or the paddle blade so that there is no gap between the outer periphery of the rotating shaft and the disk.
- a tower-type solid-liquid countercurrent contact device is provided.
- a solid particle inlet for supplying solid particles or a slurry containing solid particles to the top of the column; (b) above the solid particle inlet at the top of the column; A liquid outlet for discharging liquid; (c) a liquid inlet for supplying liquid for contact with the solid particles to the bottom of the tower; (d) the solid below the liquid inlet at the bottom of the tower.
- the tower-type solid-liquid countercurrent contact device wherein the paddle blade is a flat paddle blade.
- the tower-type solid-liquid countercurrent contact device as described above, wherein the paddle blade is disposed in the lower half region of each stirring chamber.
- the ratio of the horizontal area of the communication port of each annular partition plate to the horizontal sectional area of each stirring chamber is in the range of 4 to 25%.
- a countercurrent contact device is provided.
- the tower-type solid-liquid countercurrent contact device wherein the communication port is circular.
- the diameter of the circular disk is larger than the diameter of the rotating shaft and is in a range of 0.3 to 1.2 times the diameter of the communication port of each annular partition plate.
- the tower-type solid-liquid countercurrent contact device wherein the ratio H / D between the height H and the inner diameter D of each stirring chamber is in the range of 0.2 to 3.0. Provided.
- the above-described tower type solid-liquid countercurrent contact device wherein the solid particles are PAS particles.
- a cleaning device for solid particles particularly PAS particles, provided with the above-described tower-type solid-liquid countercurrent contact device.
- a PAS manufacturing apparatus provided with the above-described tower-type solid-liquid countercurrent contact device.
- a solid-liquid countercurrent contact method using the tower-type solid-liquid countercurrent contact device particularly a solid-liquid countercurrent contact method of PAS particles, and a PAS production method.
- the tower-type solid-liquid countercurrent contact device of the present invention can suppress a short path of solid particles mainly having a large particle size in the vicinity of the stirring shaft, and can increase the contact time between the solid particles and the liquid.
- the retention of solid particles in the vicinity of the wall of the stirring chamber is suppressed, the effective volume of the stirring chamber is ensured, and further the mixing of the solid particles in the vertical direction is suppressed, so that the solid particles enter and leave the stirring chamber.
- the frequency can be reduced.
- the tower-type solid-liquid countercurrent contact device and the solid-liquid countercurrent contact method of the present invention have the effect of improving the contact efficiency of the solid particles with the liquid.
- the tower-type solid-liquid countercurrent contact apparatus and the solid-liquid countercurrent contact method of the present invention have high contact efficiency between the solid particles and the liquid, and the washing, purification, extraction, impregnation, chemical reaction, dissolution of the solid particles.
- the effect is that it can be efficiently used for unit operations mainly in the chemical industry.
- high cleaning efficiency can be obtained, so that there is an effect that it can be effectively used for cleaning solid particles such as PAS particles and for producing PAS.
- FIG. 2 is a cross-sectional view taken along the line II of the tower-type solid-liquid countercurrent contact device of FIG.
- FIG. 4 is a cross-sectional view taken along the line II-II of the tower-type solid-liquid countercurrent contact device of FIG. 3.
- the tower-type solid-liquid countercurrent contact apparatus of the present invention comprises a tower top part 1, a tower body part 2, and a tower bottom part 3.
- a plurality of stirring chambers are partitioned from each other by an annular partition plate 4 having a communication port 41 in the center, and arranged in a vertical direction.
- the number of the stirring chambers can be appropriately selected according to the inner diameter and height of the column main body, and can be changed in the range of 2 to 100, preferably 3 to 50, particularly preferably 4 to 20, and is divided into five stirring chambers 21 to 25 in the example of FIG.
- Each stirring chamber is substantially cylindrical, and the ratio H / D between the height H and the inner diameter D of the stirring chamber is usually 0.1 to 4.0, preferably 0.2 to 3.0. Particularly preferred is 0.3 to 2.0.
- each paddle blade and at least one baffle extending in the vertical direction along the inner wall surface of the tower main body 2 are disposed, and each paddle blade is connected to each annular partition plate 4. It is fixed to the stirring shaft 8 which is a common rotating shaft that penetrates the communication port 41.
- the communication port 41 of the annular partition plate 4 is not limited in its shape and size as long as the upper and lower stirring chambers can be communicated with each other. However, if the communication port has corners, solid particles are formed at the corners. It is preferable to have a circular shape because it may accumulate or the flow of solid particles or liquid may be disturbed.
- the ratio of the horizontal area of the communication port to the horizontal sectional area of the stirring chamber is 1 to 36%, preferably 4 to 25%. Therefore, when the communication port is circular, the ratio of the diameter of the communication port to the diameter of the annular partition plate (same as the inner diameter D of the stirring chamber) is usually 0.1 to 0.6, preferably Is 0.2 to 0.5.
- each communication port 41 Since the adjacent agitation chambers are connected by an opening having a horizontal area obtained by subtracting the horizontal cross-sectional area of the agitation shaft 8 from the horizontal area of the communication port 41, the horizontal area of the communication port 41 is These are selected in consideration of the horizontal sectional area of the stirring shaft 8.
- the shape and horizontal area of each communication port 41 may all be the same, but they may be different. For example, the horizontal area of the communication port may be gradually decreased from the top to the bottom.
- paddle wing examples include a flat paddle wing, a V-type paddle wing, a fiddler wing, an inclined paddle wing, a pull margin wing, and the like.
- the flat paddle blade 5 is taken as an example.
- Part of the paddle blades disposed in each stirring chamber may be paddle blades other than the flat paddle blades, but it is preferable to use all of them as flat paddle blades 5 because stirring efficiency can be improved.
- the number of blades of the paddle blade is usually 2 to 6, and 4 is particularly preferable because the balance is good.
- the blade diameter d of the paddle blade needs to satisfy (paddle blade diameter d) / (stirring chamber diameter D) ⁇ 0.65, preferably d / D ⁇ 0.70, more preferably d / When D ⁇ 0.73, the contact efficiency increases.
- the upper limit of d / D is not particularly limited, but is usually 0.90 or less, preferably 0.85 or less, particularly preferably 0.80 or less. If d / D is too small, solid particles stay in the vicinity of the wall of the stirring chamber, the effective volume of the stirring chamber decreases, and the efficiency of the solid-liquid countercurrent contact deteriorates.
- the blade diameter of the paddle blade is represented by the sum of the length of the two paddle blades and the outer diameter of the stirring shaft.
- the blade width h of the paddle blade needs to satisfy (paddle blade width h) / (stirring chamber diameter D) ⁇ 0.10, preferably h / D ⁇ 0.08, more preferably h / D ⁇ 0.06.
- the lower limit of h / D is not particularly limited, but is usually 0.01 or more, preferably 0.012 or more, particularly preferably 0.015 or more in order to maintain the strength of the paddle blade.
- turbine blades and propeller blades are also known as stirring blades disposed in the stirring chamber.
- the propeller blades generate an axial liquid flow and the turbine blades have a high shearing effect, none of them can make a solid-liquid countercurrent contact sufficiently in the stirring chamber. Is not preferred.
- Each paddle blade 5 disposed in each stirring chamber is disposed above the communication port of each annular partition plate so that solid-liquid countercurrent contact is sufficiently performed in the stirring chamber.
- it is preferably arranged in the lower half region of the stirring chamber.
- baffle 7 disposed in each stirring chamber is a plate-like member extending in the vertical direction along the inner wall surface of the tower main body. Due to the presence of the baffle 7, only the flow in the radial direction and the circumferential direction is performed with respect to the liquid. In addition, since a flow that can be stirred up and down can be generated, the sedimentation of the solid particles is alleviated, and by arranging the baffle, the solid particles and the liquid are allowed to rotate the paddle blade 5. At the same time, it is possible to prevent the renewal of the contact interface from being disturbed together.
- Two to eight baffles 7 arranged in each stirring chamber may be arranged at equal intervals in the circumferential direction. In the illustrated example, four baffles 7 are arranged.
- the vertical height, the protruding height in the radial direction, and the mounting position of the baffle 7 are the height H and inner diameter D of each stirring chamber, the shape and size of the paddle blade, the supply speed of the solid (slurry), and the liquid It can be determined according to the supply speed or the like.
- the baffle 7 disposed in each stirring chamber is unevenly distributed on the lower side of each stirring chamber in order to sufficiently perform solid-liquid countercurrent contact in each stirring chamber, that is, in the lower half region of each stirring chamber. It is preferable to be disposed at a position where it enters, and the distance from the annular partition plate may be zero by directly attaching to the annular partition plate.
- the stirring shaft 8 that is a rotating shaft for fixing each paddle blade 5 is a common rotating shaft that passes through the tower top 1 and the tower main body 2 and also passes through the communication ports 41 of the annular partition plates 4. As described above, adjacent stirring chambers are connected by an opening having a horizontal area obtained by subtracting the horizontal cross-sectional area of the stirring shaft 8 from the horizontal area of the communication port 41. Needless to say, the diameter of the stirring shaft 8 is smaller than the communication port 41. However, if the diameter is too small, the strength of the stirring shaft 8 itself decreases and the horizontal area of the opening increases. There is a possibility that a short pass of solid particles occurs without sufficient solid-liquid contact in the stirring chamber. Therefore, the diameter of the stirring shaft 8 may be 5 to 35%, preferably 10 to 30%, particularly preferably 12 to 25% of the diameter of the communication port 41.
- a paddle blade 5 is attached and fixed to each stirring chamber 8 of the tower body 2 on the stirring shaft 8 which is a rotating shaft.
- the stirring shaft 8 may end in the tower body 2 but preferably extends into the tower bottom 3 in order to increase the stirring efficiency of the tower-type solid-liquid countercurrent contact device as a whole.
- the tip of the stirring shaft 8 is located in the tower bottom 3, it is preferable to attach a stirring blade to the tip of the stirring shaft 8. It is preferable to attach a stirring blade to the tip, because the solid-liquid contact similar to that in each stirring chamber is performed in the tower bottom 3 and the countercurrent contact efficiency of the tower-type solid-liquid countercurrent contact device is increased.
- the stirring shaft 8 which is a rotating shaft is rotationally driven by a motor provided above the tower top of the solid-liquid countercurrent contact device.
- the number of rotations of the stirring shaft can be determined as appropriate as long as the solid particles and the liquid can sufficiently come into contact with each other in the respective stirring chambers, but the stirring power (Pv) per unit volume is 0.1 to 35 W / m 3 , preferably 0.3 to 20 W / m 3 , more preferably 0.5 to 10 W / m 3, and the corresponding rotation speed is a so-called low speed rotation region of about 5 to 100 rpm.
- 8 to 60 rpm, more preferably 9 to 50 rpm, and particularly preferably 10 to 40 rpm can be employed.
- a disk 6 having a size covering at least a part of the communication port 41 located adjacent to the paddle blade 5 and below the paddle blade 5 is provided on the rotating shaft. It is attached to the rotary shaft or the paddle blade so that there is no gap between the outer periphery and the disk 6.
- the disk 6 may be disposed adjacent to the paddle blade 5, or the disk 6 may not be disposed for some paddle blades.
- a disk 6 is arranged for the majority of the wings 5.
- the disk 6 is sized to cover at least a part of the communication port 41 located below the paddle blade 5, and around the stirring shaft 8, which is a rotating shaft, between the outer periphery of the stirring shaft 8 and the disk 6. It is of a shape that can be attached and fixed to the stirring shaft 8 or the paddle blade 5 so that there is no gap between them.
- the disc 6 is usually circular or elliptical and is preferably circular so as not to cause solid particle deposition or induce unexpected flow of solid particles.
- Each disk is generally a solid plate-like shape as a whole, but the portion far from the center may be mesh-shaped.
- All the disks may be solid plate-like circles, but some of the disks may be elliptical, and the part of the disks far from the center may be mesh-shaped.
- the disk 6 is attached and fixed to the stirring shaft 8 or the paddle blade 5 adjacent to the paddle blade 5 so that there is no gap between the outer periphery of the stirring shaft 8 and the disk 6.
- a disk is formed by assembling a fan-shaped part obtained by dividing a doughnut-shaped disk having a gap having the same diameter as the stirring shaft 8 in the center into two to four in the circumferential direction around the stirring shaft 8, You may attach and fix to the stirring shaft 8 or the paddle blade 5 so that there is no space between the outer periphery of the stirring shaft 8 and the disk 6.
- Each disk 6 may be mounted adjacent to only one of the upper and lower sides of each paddle wing 5 or may be mounted adjacent to both the upper and lower sides.
- each disk 6 only needs to be adjacent to the paddle wing 5 and may be attached in direct contact with the paddle wing 5 or may be attached above or below the paddle wing 5 at a slight interval. Also good.
- the disk 6 may be attached to the stirring shaft 8 or the paddle blade 5 by directly attaching and fixing the disk 6 to the stirring shaft 8 or the paddle blade 5 with a bolt or the like.
- various shapes of attachment jigs can be used.
- the disc 6 can be made of metal such as stainless steel or hard resin.
- the disc 6 can be made of hard resin such as acrylic resin or polycarbonate resin.
- the size of the disk 6 may be any size as long as it has a larger diameter than the stirring shaft 8 and covers at least a part of the communication port 41 located below each paddle blade 5.
- the diameter of the disk 6 is larger than the diameter of the stirring shaft 8 and is usually 0.2 to 1.5 times the diameter of the communication port of each annular partition plate.
- a ratio within the range preferably a ratio within the range of 0.3 to 1.2 times may be used. If the diameter of the disk 6 is too small, solid particles that are very close to the stirring shaft 8 are prevented from being discharged in the axial direction of the stirring shaft 8 into the stirring chamber connected downward via the communication port 41. Therefore, the occurrence of a short path of solid particles cannot be reduced.
- the major axis and the minor axis may be selected so that the horizontal cross-sectional area ratio is the same as when the disk 6 is circular.
- the thickness of the disk 6 is not limited as long as the disk 6 is not easily deformed along with the rotation of the stirring shaft 8. However, when the disk 6 is made of a hard resin such as an acrylic resin or a polycarbonate resin, it is usually 0.5. In the case of being made of metal, the thickness is usually 0.2 to 2.5 mm, preferably 0.5 to 2.2 mm.
- the column top 1 has a solid particle inlet 91 and a liquid outlet 94 above the solid particle inlet 91, and the column bottom 3 has a liquid inlet 92 and a liquid outlet 92 below the liquid inlet 92.
- An outlet 93 is provided.
- the tower top 1 is connected to the tower body 2 as necessary so that the solid (slurry) introduced from the solid particle inlet 91 is not easily subjected to axial back-mixing by the liquid flow discharged from the liquid outlet 94. It has a horizontal cross-sectional area enlarged by about 1 to 4 times as compared with it, and is connected to the tower body 2 through a tapered portion.
- a stirring blade on the stirring shaft 8
- the solid (slurry) introduced from the solid particle inlet 91 flows into the stirring chamber 21 provided below the solid particle inlet 91.
- a propeller blade or the like that mainly generates an axial flow may be disposed.
- the shape of the tower bottom 3 may be a substantially cylindrical shape, but may be a shape whose diameter gradually decreases in a tapered shape toward the processed product outlet 93.
- the tip of the stirring shaft 8 may or may not protrude from the tower bottom 3. Further, when the tip of the stirring shaft 8 is at the bottom of the tower, it is not necessary to arrange the stirring blade at the tip of the stirring shaft 8, but it is preferable to arrange the stirring blade.
- Solid-liquid countercurrent contact treatment In the apparatus having such a configuration, the solid (slurry) introduced from the solid particle inlet 91 to the tower top 1 is introduced into the first stirring chamber 21 without undergoing substantial back-mixing.
- the solid (slurry) moves in the radial direction and the circumferential direction along with the radial liquid flow generated by the rotation of the paddle blade 5 disposed in the stirring chamber 21, and the baffle 7 fixed to the inner wall of the stirring chamber 21.
- the flow mainly composed of solid (slurry) forms a circulating flow on the upper and lower sides of the paddle blade 5 to thereby enter the stirring chamber. Since the liquid stays for a predetermined time, solid-liquid contact between the solid (slurry) and the liquid introduced from the liquid inlet 92 is effectively achieved in the stirring chamber 21.
- the same solid-liquid contact process is repeated in the stirring chambers 23 to 25, and by repeating such an efficient solid-liquid contact process, the solid-liquid contact efficiency of the tower-type solid-liquid countercurrent contact apparatus as a whole is high. Is achieved.
- the tower-type solid-liquid countercurrent contact device of the present invention utilizes the density difference between the solid and the liquid as described above, it is necessary that there is a difference in the density between the solid and the liquid in the stirring tank (chamber). is there.
- the solid-liquid density ratio that is, [solid density] / [liquid density] is 1.03 to 20.0, preferably 1.05 to 10.0, and more preferably 1.07 to 5. 0.0.
- the solid-liquid density ratio is smaller than 1.03, the solid-liquid separation is poor, and when the solid-liquid density ratio exceeds 20.0, the solid-liquid contact efficiency is lowered.
- the solid (slurry) that has been subjected to the solid-liquid contact in the tower main body 2 is then brought into contact with the liquid introduced from the liquid inlet 92 by the rotation of the stirring blade 81 in the tower bottom 3 as desired. Then, it is discharged from the treated product outlet 93 as a solid (slurry).
- the liquid introduced from the liquid inlet 92 is brought into contact with the solid (slurry) introduced from the solid particle inlet 91 with solid solid-liquid contact at the tower bottom 3 and stirring at the tower body 2. After being subjected to liquid contact and gentle solid-liquid contact at the top 1, the liquid is discharged from the liquid outlet 94 at the top 1.
- the flow of liquid and the flow of solid particles in each of the stirring chambers 21 to 25 can be observed and confirmed from the outside. It may be.
- solid (slurry) is introduced from a solid particle inlet 91 and liquid is introduced from a liquid inlet 92 to perform solid-liquid contact in the apparatus.
- Specific examples include washing, purification, extraction, impregnation, reaction, dissolution.
- the tower-type solid-liquid countercurrent contact device of the present invention there is use as a cleaning device for cleaning PAS particles separated and recovered from a PAS slurry or for cleaning PAS particles for subsequent purification.
- JP-A-61-255933 discloses a method for treating a polymer slurry containing PAS particles obtained in the polymerization step.
- this treatment method (1) PAS particles, crystallized alkali chloride-containing slurry containing PAS particles, by-produced crystals and dissolved alkali chloride, and arylene sulfide oligomer are screened by sieving a polymerization slurry whose liquid component is mainly N-methylpyrrolidone.
- the tower-type solid-liquid countercurrent contact device of the present invention can be used as a PAS production device.
- the PPS slurry used in the examples and comparative examples is obtained by separating PPS particles from the reaction solution containing the PPS polymer after the polymerization reaction, and then washing the recovered PPS particles with acetone to re-slurry them with an aqueous medium. It was prepared.
- the tower-type solid-liquid countercurrent contact device has a total height of 1325 mm, and comprises a tower top part 1 having an inner diameter of 700 mm, a tower main body part 2 made of an acrylic resin plate having an inner diameter of 310 mm and the inside of which can be seen through, and a tower bottom part 3.
- the tower body 2 is divided into five stirring chambers 21-25.
- An annular partition plate 4 having a communication port 41 having an inner diameter of 140 mm was provided between the stirring chambers.
- a total of four baffles 7 having a lateral width of 15.5 mm and a height of 39 mm were fixed to the annular partition plate 4 so as to extend in the height direction at four locations on the inner wall of each stirring chamber at 90 ° intervals.
- a stirring shaft 8 having an outer diameter of 20 mm is provided through the communication port of the annular partition plate of each stirring chamber, and is rotated by a motor placed on the upper surface of the tower top.
- each stirring chamber as a paddle blade, four flat paddle blades 5 having dimensions of a stirring blade diameter (total of the length of two paddle blades and the outer diameter of the stirring shaft) of 232.5 mm and a blade width of 15.5 mm are provided.
- a stirring blade diameter total of the length of two paddle blades and the outer diameter of the stirring shaft
- a blade width 15.5 mm.
- a circular disk 6 made of SUS340 having an outer diameter of 93 mm and a thickness of 2 mm was fixed to the stirring shaft 8 via an attachment jig (not shown) so as to contact the upper surface of each flat paddle blade 5.
- the tower top 1 is provided with a solid particle inlet 91 on the lower side and a liquid outlet 94 on the upper side.
- the lower part of the tower top part 1 has a taper-like diameter gradually decreasing so as to be connected to the upper part of the tower body part.
- a paddle blade (no number) having a stirring blade diameter of 232.5 mm is fixed to the stirring top 8 at the tower top 1.
- the tower top 1 may not have a stirring blade. .
- a liquid inlet 92 and a processed product outlet 93 are provided in the tower bottom 3.
- the processed product outlet 93 is provided at the bottom, and the lower portion of the tower bottom 3 is gradually tapered toward the processed product outlet 93 in a tapered shape.
- this tower-type countercurrent contact device is a device having a total of six countercurrent contact stages including the five stirring chambers and the bottom of the tower body.
- the stirring shaft 8 was rotated at a stirring rotational speed of 15 rpm using the tower-type countercurrent contact device, the stirring power was 0.7 W / m 3 .
- the PPS slurry was supplied from the solid particle inlet 91 at a rate of 550 kg / h, and the ion exchange water was supplied from the liquid inlet 92 at a rate of 600 kg / h.
- the composition of the PPS slurry was 20% by mass of PPS particles (dry basis) having an average particle diameter of 520 ⁇ m, 64% by mass of ion-exchanged water, and 16% by mass of acetone.
- the improved blades provided in each stirring chamber that is, the flat paddle blade 5 to which the disk 6 is attached, and the four baffles 7 cause the PPS slurry and water to be mixed while being stirred in each stirring chamber.
- the PPS particles inside and water contacted each other, and the cleaning process proceeded, while PPS particles having a density higher than that of water (density 1.35) gradually settled and sequentially passed through the stirring chamber.
- the drained liquid was discharged from the liquid outlet 94 at 650 kg / h, and the washed slurry was discharged from the treated object outlet 93 at 500 kg / h. No PPS particles were found in the drainage. Therefore, the cleaning bath ratio determined by the ratio of the cleaning liquid to the PPS particles in the slurry was 1.91.
- the acetone concentration (exit acetone concentration) in the washed slurry liquid phase was 3.36% by mass, and the washing efficiency was 30%.
- the target product is acetone.
- Table 1 shows the results of the examples using the improved wings.
- the tower-type countercurrent contact device shown in FIGS. 3 and 4 was used to perform the cleaning treatment in the same manner as in the example.
- the apparatus shown in FIGS. 3 and 4 is the same as the apparatus shown in FIG. 1 except that a conventional impeller, that is, a flat paddle impeller 5 not provided with a disk 6 is provided as an impeller provided in each stirring chamber. The same.
- the stirring power and the cleaning efficiency were measured at 22 rpm, 30 rpm, and 40 rpm, respectively.
- Table 1 shows the results of a comparative example using conventional blades.
- the PPS particles in the vicinity of the stirring shaft are very rarely discharged as a short path, and stay in each stirring chamber for a relatively long time. As a result of sufficient contact between the PPS particles and the cleaning liquid, it is assumed that the cleaning efficiency is improved.
- the PPS particles in the vicinity of the stirring shaft settle without being sufficiently contacted with the cleaning liquid, so that the lower stirring is performed from a certain stirring chamber. By repeating the transfer to the chamber, PPS particles were discharged from the tower-type solid-liquid countercurrent contact device, and a short pass with insufficient cleaning treatment was generated.
- the tower-type solid-liquid countercurrent contact device of the present invention suppresses the generation, retention, and backflow of short paths of solid particles, and can achieve high processing efficiency with a small stirring power.
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Abstract
Description
式(1): (パドル翼の翼径)/(攪拌室の径)≧0.65
式(2): (パドル翼の翼幅)/(攪拌室の径)≦0.10
を満足する該パドル翼;及び塔本体部の内壁面に沿って垂直方向に延びる少なくとも1つのバッフル;が配置された構造を有し、かつ、該パドル翼の下方に位置する連通口の少なくとも一部を覆う大きさの円盤が、該パドル翼に隣接し、該回転軸の外周と円盤との間に空隙がないように、該回転軸または該パドル翼に取り付けられていることを特徴とする塔型固液向流接触装置が提供される。
塔頂部1と塔底部3との間にある塔本体部2には、複数の攪拌室が、中央に連通口41を有する環状仕切板4により互いに区画されて、垂直方向に連設されて配置されている。攪拌室の数は、塔本体部の内径や高さに応じて適宜選定することができ、必要な理論固液接触段数に応じて、2~100の範囲で変更可能であり、好ましくは3~50、特に好ましくは4~20であり、図1の例では5つの攪拌室21~25に分割されている。各攪拌室は実質的に円筒状であって、攪拌室の高さHと内径Dとの比H/Dは、通常0.1~4.0であり、好ましくは0.2~3.0、特に好ましくは0.3~2.0である。固液密度比、すなわち、[固体の密度]/[液体の密度]が大きい場合は、H/Dを大きくすることが好ましく、また、固液密度比が小さい場合は、H/Dを小さくすることができるので、塔型固液向流接触装置全体の高さを低くすることが可能となる。
環状仕切板4の連通口41は、上下の攪拌室を連通させることができるものであれば、その形状や大きさは限定されないが、連通口に角部があると、該角部に固体粒子が堆積したり、固体粒子または液体の流れが乱れることがあるので、円形であることが好ましい。攪拌室の水平方向の断面積に対する連通口の水平方向の面積の比率は、1~36%、好ましくは4~25%である。したがって、連通口が円形である場合は、該環状仕切板の径(攪拌室の内径Dと同じである)に対する該連通口の径の比は、通常0.1~0.6であり、好ましくは0.2~0.5である。連通口が大きすぎると、各攪拌室内での固液向流接触が十分行われないままに、固体粒子が直下の攪拌室に排出されてしまうので、この繰り返しにより、塔型固液向流接触装置における固液向流接触が不十分となる。他方、連通口が小さすぎると、各攪拌室内での固液向流接触が十分行われた固体粒子が、直下の攪拌室にいつまでも排出されず、新しい液体との接触が行われない結果、塔型固液向流接触装置における固液向流接触が不十分となるとともに、処理時間が極端に長くなり処理効率が低下する。隣接する攪拌室は、連通口41の水平方向の面積から攪拌軸8の水平方向の断面積を差し引いた水平方向の面積の開口部によって連設されるので、連通口41の水平方向の面積は、攪拌軸8の水平方向の断面積を考慮して選定される。各連通口41の形状及び水平方向の面積は、すべて同一でもよいが、異なるものとしてもよく、例えば、連通口の水平方向の面積を、上方から下方に向かって、漸減してもよい。
パドル翼としては、平パドル翼、V型パドル翼、ファウドラー翼、傾斜パドル翼、プルマージン翼等が挙げられるが、特に、実質的に半径方向の液の流れのみを生じる平パドル翼が好ましいので、以下の説明は、平パドル翼5を例にとって行うこととする。その他のパドル翼を採用する場合は、主に半径方向の液流を生じさせることが必要であり、顕著な軸方向の液流を生じさせない形状の翼とする必要がある。各攪拌室に配置されるパドル翼としては、一部を平パドル翼以外のパドル翼としてもよいが、すべてを平パドル翼5とすることが、攪拌効率を高めることができるので好ましい。パドル翼の羽根板の枚数は、通常2枚~6枚であり、4枚が、バランスがよいので、特に好ましい。
各攪拌室に配置されるバッフル7は、塔本体部の内壁面に沿って垂直方向に延びる板状の部材であり、バッフル7の存在により、液体に対して、半径方向や周方向の流れだけでなく、上下にも攪拌されるような流れを生じさせることができるので、固体粒子の沈降が緩和され、また、バッフルを配置することにより、固体粒子と液体とが、パドル翼5の回転に伴って、共回りして接触界面の更新が妨げられるのを防ぐこともできる。各攪拌室に配置されるバッフル7は、円周方向に均等間隔に2~8枚配置すればよく、図示した例では、4枚配置されている。バッフル7の垂直方向の高さ、半径方向の突出高さ、及び取り付け位置は、各攪拌室の高さH及び内径D、パドル翼の形状及び大きさ、固体(スラリー)の供給速度及び液体の供給速度等に応じて定めることができる。各攪拌室に配置するバッフル7は、各攪拌室内において固液向流接触を十分に行わせるために、各攪拌室の下側に偏在する形態で、すなわち、各攪拌室の下半分の領域内に入る位置に配置されていることが好ましく、環状仕切板に直付けして、環状仕切板との間隔がゼロでもよい。
各パドル翼5を固定する回転軸である攪拌軸8は、塔頂部1及び塔本体部2を貫通するとともに、各環状仕切板4の各連通口41を貫通する共通の回転軸である。先に述べたように、隣接する攪拌室は、連通口41の水平方向の面積から攪拌軸8の水平方向の断面積を差し引いた水平方向の面積の開口部によって連設されている。攪拌軸8の径は、連通口41より小さいことはいうまでもないが、径が小さすぎると、攪拌軸8自体の強度が小さくなるとともに、前記開口部の水平方向の面積が大きくなる結果、攪拌室内での十分な固液接触が行われないまま、固体粒子のショートパスが起きるおそれがある。したがって、攪拌軸8の径は、連通口41の径の5~35%、好ましくは10~30%、特に好ましくは12~25%の範囲の大きさとすればよい。
本発明の塔型固液向流接触装置は、パドル翼5に隣接して、該パドル翼5の下方に位置する連通口41の少なくとも一部を覆う大きさの円盤6が、該回転軸の外周と円盤6との間に空隙がないように、該回転軸または該パドル翼に取り付けられているものである。各攪拌室に配置されるパドル翼のすべてについて、パドル翼5に隣接して円盤6を配置してもよいし、一部のパドル翼について、円盤6を配置しなくてもよいが、少なくともパドル翼5の過半について円盤6を配置する。
塔頂部1には、固体粒子入口91、及び、該固体粒子入口91よりも上方に、液体出口94が、塔底部3には液体入口92、及び、該液体入口92よりも下方に、処理物出口93が設けられている。
このような構成の装置において、固体粒子入口91から塔頂部1に導入された固体(スラリー)は、本質的な逆混合を受けることなく、第1の攪拌室21に導入される。固体(スラリー)は、攪拌室21に配置されたパドル翼5の回転で生じる半径方向の液流に随伴して半径方向及び周方向に移動するとともに、攪拌室21の内壁に固着されたバッフル7の作用により分割されてパドル翼5取付位置の上側及び下側に移動し、固体(スラリー)を主とする流れは、該パドル翼5の上下側において循環流を形成することにより、攪拌室内に所定時間滞留するので、攪拌室21内において、固体(スラリー)と液体入口92から導入された液体との固液接触が効果的に達成される。
図1及び図2に示す構成の塔型固液向流接触装置を用いて、ポリフェニレンスルフィド(PPS)粒子を含有する水性スラリー(PPSスラリー)の洗浄処理を行った。
C1=C0*(1-ε)(n-1)
から、算出した。
(式中、C0は、装置入口におけるスラリー中の目的物の濃度、C1は、装置出口におけるスラリー中の目的物の濃度、nは、攪拌室の段数である。本実施例及び比較例においては、目的物はアセトンである。)
図1及び図2の塔型向流接触装置に代えて、図3及び図4に示す塔型向流接触装置を用いて、実施例と同様に洗浄処理を行った。図3及び図4の装置は、各攪拌室内に設けた攪拌翼として、従来翼、すなわち、円盤6が設けられていない平パドル翼5を備えるものとしたことを除いて、図1の装置と同じである。また、攪拌回転数は、実施例とほぼ同じ攪拌動力を得るために、22rpm、30rpm及び40rpmとして、それぞれ攪拌動力及び洗浄効率を測定した。
2 塔本体部
21~25 攪拌室
3 塔底部
4 環状仕切板
41 連通口
5 平パドル翼
6 円盤
7 バッフル
8 攪拌軸
81 平パドル翼
91 固体粒子入口
92 液体入口
93 処理物出口
94 液体出口
S ショートパス
Claims (16)
- 塔頂部、塔本体部及び塔底部を有する固体粒子と液体とを向流接触させる塔型固液向流接触装置であって、
該塔本体部に、中央に連通口を有する各環状仕切板により互いに区画されて垂直方向に連設された複数個の攪拌室を備え、
各攪拌室内に、
各環状仕切板の連通口を貫通する共通の回転軸に固定されたパドル翼であって、
以下の式(1)及び(2)
式(1): (パドル翼の翼径)/(攪拌室の径)≧0.65
式(2): (パドル翼の翼幅)/(攪拌室の径)≦0.10
を満足する該パドル翼;及び
塔本体部の内壁面に沿って垂直方向に延びる少なくとも1つのバッフル;
が配置された構造を有し、かつ、
該パドル翼の下方に位置する連通口の少なくとも一部を覆う大きさの円盤が、該パドル翼に隣接し、該回転軸の外周と円盤との間に空隙がないように、該回転軸または該パドル翼に取り付けられていることを特徴とする塔型固液向流接触装置。 - (a)該塔頂部に、固体粒子または固体粒子を含有するスラリーを供給するための固体粒子入口;
(b)該塔頂部の該固体粒子入口よりも上方に、液体を排出するための液体出口;
(c)該塔底部に、該固体粒子との接触用液体を供給するための液体入口;
(d)該塔底部の該液体入口よりも下方に、該固体粒子を該接触用液体と接触処理した後の処理物を取り出すための処理物出口;
が配置された構造を有する請求項1記載の塔型固液向流接触装置。 - 該パドル翼が、平パドル翼である請求項1記載の塔型固液向流接触装置。
- 該パドル翼が、各攪拌室内の下半分の領域内に配置されている請求項1記載の塔型固液向流接触装置。
- 該各攪拌室の水平方向の断面積に対する各環状仕切板の連通口の水平方向の面積の比率が4~25%の範囲内である請求項1記載の塔型固液向流接触装置。
- 該連通口が、円形である請求項1記載の塔型固液向流接触装置。
- 該円盤が円形であり、その直径が、該回転軸の直径よりも大きく、かつ、各環状仕切板の連通口の直径に対して0.3~1.2倍の範囲内の比率を有するものである請求項6記載の塔型固液向流接触装置。
- 各攪拌室の高さHと内径Dとの比H/Dが、0.2~3.0の範囲内である請求項1の塔型固液向流接触装置。
- 固体粒子がポリアリーレンスルフィド粒子である請求項1記載の塔型固液向流接触装置。
- 請求項1記載の塔型固液向流接触装置を備える固体粒子の洗浄装置。
- 請求項1記載の塔型固液向流接触装置を備えるポリアリーレンスルフィドの製造装置。
- 請求項1記載の塔型固液向流接触装置を用いる固体粒子の固液向流接触方法。
- 請求項10記載の洗浄装置を用いる固体粒子の洗浄方法。
- 請求項1記載の塔型固液向流接触装置を用いるポリアリーレンスルフィド粒子の固液向流接触方法。
- 請求項1記載の塔型固液向流接触装置を用いるポリアリーレンスルフィドの製造方法。
- 請求項10記載の洗浄装置を用いるポリアリーレンスルフィド粒子の洗浄方法。
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