CN114736319B - Apparatus system and method for purifying polymer from polymeric emulsion - Google Patents
Apparatus system and method for purifying polymer from polymeric emulsion Download PDFInfo
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- CN114736319B CN114736319B CN202110020369.9A CN202110020369A CN114736319B CN 114736319 B CN114736319 B CN 114736319B CN 202110020369 A CN202110020369 A CN 202110020369A CN 114736319 B CN114736319 B CN 114736319B
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- 239000000839 emulsion Substances 0.000 title claims abstract description 55
- 229920000642 polymer Polymers 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005406 washing Methods 0.000 claims abstract description 55
- 230000015271 coagulation Effects 0.000 claims abstract description 45
- 238000005345 coagulation Methods 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000003860 storage Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 239000002033 PVDF binder Substances 0.000 claims description 23
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 23
- 238000006116 polymerization reaction Methods 0.000 claims description 21
- 239000012752 auxiliary agent Substances 0.000 claims description 12
- 238000004806 packaging method and process Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001112 coagulating effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 abstract description 12
- 230000003749 cleanliness Effects 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000379 polymerizing effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 13
- 238000003756 stirring Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 4
- 238000010924 continuous production Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011883 electrode binding agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/14—Treatment of polymer emulsions
- C08F6/16—Purification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The present invention provides an apparatus system and method for purifying a polymer from a polymeric emulsion. The device system comprises an emulsion storage tank, a coagulation barrel, a washing tank, a centrifugal machine, a dryer and a vibrating fluidized bed which are sequentially communicated; the emulsion storage tank is used for caching and polymerizing emulsion; the coagulation barrel is provided with a feed inlet and a discharge outlet which are higher than the feed inlet, and a stirrer is arranged in the coagulation barrel; the washing tank is provided with two feeding holes which are respectively used for feeding washing liquid and feeding materials flowing out of the coagulation barrel, and an upper discharging hole and a lower discharging hole which are respectively used for discharging the washed materials and discharging washing waste liquid. The device system provided by the invention is adopted to purify the polymer, manual intervention is not needed in the whole process, the pollution of the manual operation to the product is avoided, and the cleanliness of the polymer is improved; and the purification process is continuous, and compared with a batch purification method, the production efficiency is higher.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a device system and a method for purifying a polymer from a polymerization emulsion.
Background
Polyvinylidene fluoride resin (PVDF) is a new material developed in the 70 th century with excellent comprehensive properties. PVDF has excellent corrosion resistance, weather resistance, electrical insulation and piezoelectricity, good thermal stability and excellent high-temperature processability, and is widely applied to various fields.
PVDF is one of the best materials for pumps, valves, piping, plumbing fittings, tanks and heat exchangers for petrochemical plant fluid handling systems as a whole or lining because of its good chemical resistance, processability, and fatigue and creep resistance. PVDF has good chemical stability and electrical insulation property, so that the manufactured equipment can meet TOCS and flame-retardant requirements, is widely applied to storage and transportation of high-purity products in the semiconductor industry, and has quite excellent application in anticorrosive paint. In the field of coatings, PVDF is widely used in power stations, airports, highways, high-rise buildings, chemical container corrosion inhibitors and other places due to its excellent color retention and self-cleaning (dust resistance). The PVDF building membrane material has very wide application in the field of emerging building materials which are rapidly developed; among them, the fields of environmental protection, photovoltaic, automobile, electronics, medical treatment, etc. become one of the fastest growing markets for PVDF demand.
The PVDF with high cleanliness is an indispensable key material in the advanced national defense and military industry such as missiles, satellites and the like, and has huge space requirements in the fields such as the military industry, emerging civilian use and the like, for example, the PVDF thermoelectric film and the piezoelectric film are applied to earphones, electronic musical instruments, vibration measuring and damping instruments, alarm systems, sonar and nondestructive detection, and are also applied to cardiac pacemakers, respiratory monitors and the like in the medical field. In lithium batteries, PVDF is primarily used as the positive and negative electrode binder and separator.
The conventional PVDF production process includes polymerization, coagulation, press washing and drying, which has the following problems in terms of ensuring cleanliness:
1. the intermittent condensation mode is adopted, demulsification is not thorough, and more materials are entrained in the mother liquor; the condensed materials float on the water surface and are discharged manually through the top, and the materials are polluted by manual intervention in the process;
2. the condensed materials are pumped to a plate-and-frame filter press for filter pressing, dehydration and washing, and in the process, the filter cloth is repeatedly used, so that the cleanliness is difficult to ensure, and products can be polluted; the plate-and-frame filter press needs manual intervention, and products are easy to pollute; directly flushing a filter cake in a plate-and-frame filter press, washing is incomplete, and an auxiliary agent added in the polymerization reaction is difficult to remove cleanly;
3. the materials after filter pressing and washing are manually added into a flash dryer, and the products are easy to be polluted secondarily in the feeding and discharging processes; the retention time of the materials in the flash dryer is short, and the auxiliary agent is difficult to volatilize.
Moreover, the traditional PVDF production process is a batch process, and the production efficiency is low. Other polymers produced by batch processes and having high requirements for cleanliness also face the above-mentioned problems in production.
Therefore, there is a need in the art to develop a new process for purifying polymers to reduce the artificial contamination during the purification process while improving the production efficiency.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide an apparatus system and method for purifying a polymer from a polymeric emulsion. The method provided by the invention does not need manual intervention in the whole process, avoids the pollution of the manual work to the product, and improves the cleanliness of the polymer; and the purification process is continuous, and compared with a batch purification method, the production efficiency is higher.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an apparatus system for purifying a polymer from a polymeric emulsion, the apparatus system comprising an emulsion storage tank, a coagulation tank, a wash tank, a centrifuge, a dryer and a vibrating fluidized bed in sequential communication;
the emulsion storage tank is used for buffering the polymerization emulsion flowing out of the polymerization reaction kettle;
the coagulation barrel is provided with a feed inlet and a discharge outlet which are higher than the feed inlet, and a stirrer is arranged in the coagulation barrel and used for demulsifying and coagulating the polymerized emulsion;
the washing tank is provided with two feeding holes which are respectively used for feeding washing liquid, feeding materials flowing out of the coagulation barrel, and an upper discharging hole and a lower discharging hole; the upper discharge hole of the washing tank is connected with the centrifugal machine and used for discharging washed materials, and the lower discharge hole of the washing tank is used for discharging washing waste liquid.
In the device system provided by the invention, the emulsion storage tank is connected with the polymerization reaction kettle and is used for caching the polymerization emulsion flowing out of the polymerization reaction kettle, so that the subsequent purification process can be continuously carried out; the coagulation barrel with a lower feed inlet and an upper discharge outlet is adopted, so that the demulsification degree of the polymerized emulsion is gradually increased from bottom to top under the shearing action of the high-strength stirring blade, and the emulsion is completely demulsified near the upper discharge outlet and continuously flows out from the upper discharge outlet; the washing tank is used for primarily cleaning materials, and the polymer is generally less in density than washing liquid (generally water), so that the polymer can flow out from an upper discharge hole of the washing tank; the centrifuge is adopted to replace the traditional plate-and-frame filter press, so that the pollution to products caused by manual intervention and repeated use of filter cloth is avoided; the vibrating fluidized bed is used for auxiliary agent desorption, can fully volatilize residual auxiliary agent in the polymer, and improves the cleanliness of the polymer along with the tail gas brought out of the system.
The device system provided by the invention is adopted to purify the polymer, so that impurities such as auxiliary agents in the polymer can be sufficiently removed, manual intervention is not needed in the whole process, the pollution of manpower to products is avoided, and the cleanliness of the polymer is improved; the purification process is a continuous production mode, and compared with the existing intermittent purification method, the production efficiency is higher, the productivity is higher, and the product quality is more uniform.
In some embodiments of the invention, the aspect ratio of the coagulation bucket is greater than or equal to 6:1; for example, it may be 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, 10:1, 10.5:1, 11:1, 13:1, 15:1, 18:1, or 20:1, etc.
In the present invention, the aspect ratio of the coagulation bucket refers to the aspect ratio of the cavity inside the coagulation bucket. The existing batch coagulation method adopts a coagulation barrel for feeding and discharging from a top cover, and the length-diameter ratio of the coagulation barrel is generally 1.2-1.5:1. The coagulation barrel adopted by the invention has larger length-diameter ratio, is fed from the lower feed port and discharged from the upper discharge port, is beneficial to gradually demulsifying the polymerization emulsion under the action of stirring and shearing in the process of flowing from bottom to top, completely demulsifies near the upper discharge port and continuously flows out from the upper discharge port.
In some embodiments of the invention, the inlet of the coagulation bucket is located at the bottom and the outlet is located at the top.
In some embodiments of the invention, the agitator has a plurality of layers of blades, the rotational axis of the agitator being parallel to the axial direction of the coagulation bucket.
In some embodiments of the invention, a metering pump and a regulating valve are also arranged on the pipeline between the emulsion storage tank and the coagulation barrel, and are used for controlling the flow rate of the polymerized emulsion.
In some embodiments of the invention, the wash tank has a higher feed inlet for the wash liquid than the feed inlet for the material exiting the coagulation bucket.
The polymer is generally less dense than the wash liquor (typically water) and will naturally float up in the wash tank. Through the upper portion of the washing tank into which the washing liquid is fed, the lower portion of the washing tank is fed with the material flowing out of the coagulation barrel, the washing liquid and the material can be ensured to be fully contacted, and the washing is more fully performed.
In some embodiments of the invention, the centrifuge is a horizontal screw centrifuge.
The horizontal spiral centrifuge is adopted, and the materials after the solvent is removed by centrifugation can directly enter the dryer under the action of gravity, so that the manual intervention and the pollution of filter cloth to products are avoided.
In some embodiments of the invention, the dryer is a flash dryer or a spray dryer, preferably a spray dryer.
In some embodiments of the invention, the apparatus system further comprises an automatic packaging machine coupled to the vibrating fluidized bed for packaging the purified polymer.
In a second aspect, the present invention provides a process for purifying a polymer from a polymeric emulsion using the apparatus system of the first aspect.
In some embodiments of the invention, the method comprises:
adopting the device system of the first aspect, enabling the polymerization emulsion flowing out of the polymerization reaction kettle to enter an emulsion storage tank for caching;
the polymerization emulsion flowing out of the emulsion storage tank enters from a feed inlet below the coagulation barrel, is completely demulsified at a discharge outlet above the polymerization emulsion storage tank under the action of a stirrer, and continuously flows out;
the material flowing out of the coagulation barrel enters a washing tank, meanwhile, washing liquid is introduced into the washing tank for washing, washing waste liquid is discharged from a lower discharge port of the washing tank, and the washed material flows out from an upper discharge port of the washing tank;
the washed material enters a centrifugal machine to remove the solvent;
the materials after the solvent removal enter a dryer for drying;
and (5) allowing the dried material to enter a vibrating fluidized bed for auxiliary agent desorption to obtain the polymer.
In some embodiments of the invention, the temperature in the vibrating fluidized bed is 160-200 ℃ (for example, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 195 ℃ or 200 ℃ and the like), and the residence time of the material in the vibrating fluidized bed is more than or equal to 10min (for example, 10min, 11min, 12min, 15min, 18min, 20min, 25min, 30min, 35min, 40min, 45min, 50min, 55min or 60min and the like).
In the invention, the vibrating fluidized bed is used for fully volatilizing the residual auxiliary agent in the polymer, so that the cleanliness of the polymer is improved. The temperature and residence time in the vibrating fluidized bed can be selected by the person skilled in the art according to the actual need, as long as sufficient volatilization of the residual auxiliary agent in the polymer is ensured. Generally, the temperature can be selected to be 160-200℃and the residence time not less than 10 minutes.
In some embodiments of the invention, the method further comprises: and cooling the polymer discharged by the vibrating fluidized bed, and then, feeding the cooled polymer into an automatic packaging machine for packaging.
Compared with the prior art, the invention has the following beneficial effects:
the device system provided by the invention is adopted to purify the polymer, so that impurities such as auxiliary agents in the polymer can be sufficiently removed, manual intervention is not needed in the whole process, the pollution of manpower to products is avoided, and the cleanliness of the polymer is improved; the purification process is a continuous production mode, and compared with the existing intermittent purification method, the production efficiency is higher, the productivity is higher, and the product quality is more uniform.
Drawings
FIG. 1 is a schematic diagram of an apparatus system for purifying a polymer from a polymeric emulsion according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings. It should be apparent to those skilled in the art that the detailed description is merely provided to aid in understanding the invention and should not be taken as limiting the invention in any way.
Example 1
The embodiment provides a device system for purifying polymer from polymerization emulsion, which has the structure shown in figure 1 and comprises an emulsion storage tank, a coagulation barrel, a washing tank, a horizontal spiral centrifuge, a spray dryer and a vibrating fluidized bed which are communicated in sequence;
the emulsion storage tank is used for buffering the polymerization emulsion flowing out of the polymerization reaction kettle;
the device comprises a coagulation barrel, a stirring device and a stirring device, wherein the coagulation barrel is provided with a feed inlet and a discharge outlet, the discharge outlet is higher than the feed inlet, the stirring device is used for demulsification and coagulation of the polymer emulsion and is provided with a plurality of layers of blades, and a rotating shaft of the stirring device is parallel to the axial direction of the coagulation barrel;
the washing tank is provided with an upper feeding hole and a lower feeding hole which are respectively used for feeding washing liquid, feeding materials flowing out of the coagulation barrel and an upper discharging hole and a lower discharging hole; the upper discharge hole of the washing tank is connected with the horizontal spiral centrifugal machine and used for discharging washed materials, and the lower discharge hole of the washing tank is used for discharging washing waste liquid;
wherein, the diameter of the coagulation barrel is 600mm, and the height is 5000mm.
Example 2
This example provides a system of apparatus for purifying polymer from a polymeric emulsion, differing from example 1 in that metering pumps and regulating valves are also provided in the piping between the emulsion reservoir and the coagulation drum for controlling the flow of the polymeric emulsion.
Example 3
This example provides an apparatus system for purifying a polymer from a polymeric emulsion, differing from example 2 in that the apparatus system further comprises an automatic packaging machine coupled to the vibrating fluidized bed for packaging the purified polymer.
Example 4
The embodiment provides a method for purifying PVDF from PVDF polymerization emulsion, comprising the following steps:
using the device system described in example 2, the PVDF polymerized emulsion flowing from the polymerization reactor was buffered in an emulsion tank;
PVDF polymerized emulsion flowing out of the emulsion storage tank enters from a feed inlet below the coagulation barrel, is completely demulsified at a discharge outlet above the emulsion storage tank under the action of a stirrer, and continuously flows out;
the material flowing out of the coagulation barrel enters a washing tank, high-purity water is introduced into the washing tank for washing, washing waste liquid is discharged from a lower discharge port of the washing tank, and the washed material flows out from an upper discharge port of the washing tank;
the washed material enters a horizontal spiral centrifuge for dehydration;
the dehydrated material enters a spray dryer under the action of gravity and is dried at 100 ℃;
and (3) allowing the dried material to enter a vibrating fluidized bed for auxiliary agent desorption, controlling the temperature of the vibrating fluidized bed to be 165 ℃ and the material residence time to be 15min, so as to obtain PVDF.
The device system provided by the invention is adopted to purify the polymer, so that impurities such as auxiliary agents in the polymer can be sufficiently removed, manual intervention is avoided in the whole process, the pollution of manual work to products is avoided, and the cleanliness of the polymer is improved; the purification process is a continuous production mode, and compared with the existing intermittent purification method, the production efficiency is higher, the productivity is higher, and the product quality is more uniform.
While the invention has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for purifying PVDF from PVDF polymeric emulsion is characterized in that a device system for purifying polymer from the polymeric emulsion is adopted, and the device system comprises an emulsion storage tank, a coagulation barrel, a washing tank, a centrifuge, a dryer and a vibrating fluidized bed which are communicated in sequence;
the emulsion storage tank is used for buffering the polymerization emulsion flowing out of the polymerization reaction kettle;
the coagulation barrel is provided with a feed inlet and a discharge outlet which are higher than the feed inlet, and a stirrer is arranged in the coagulation barrel and used for demulsifying and coagulating the polymerized emulsion; the length-diameter ratio of the coagulation barrel is 6:1 to 20:1, the feed inlet of the coagulation barrel is positioned at the bottom, and the discharge outlet is positioned at the top;
the washing tank is provided with two feeding holes which are respectively used for feeding washing liquid, feeding materials flowing out of the coagulation barrel, and an upper discharging hole and a lower discharging hole; the upper discharge hole of the washing tank is connected with the centrifugal machine and used for discharging washed materials, the lower discharge hole of the washing tank is used for discharging washing waste liquid, and the centrifugal machine is a horizontal spiral centrifugal machine;
the method comprises the following steps: PVDF polymerized emulsion flowing out of the polymerization reaction kettle enters an emulsion storage tank for caching;
PVDF polymerized emulsion flowing out of the emulsion storage tank enters from a feed inlet below the coagulation barrel, is completely demulsified at a discharge outlet above the emulsion storage tank under the action of a stirrer, and continuously flows out;
the material flowing out of the coagulation barrel enters a washing tank, meanwhile, washing liquid is introduced into the washing tank for washing, washing waste liquid is discharged from a lower discharge port of the washing tank, and the washed material flows out from an upper discharge port of the washing tank;
the washed material enters a centrifugal machine to remove the solvent;
the materials after the solvent removal enter a dryer for drying;
and (3) allowing the dried material to enter a vibrating fluidized bed for auxiliary agent desorption to obtain the PVDF polymer, wherein the temperature in the vibrating fluidized bed is 160-200 ℃, and the residence time of the material in the vibrating fluidized bed is more than or equal to 10min.
2. The method of claim 1, wherein the agitator has a plurality of layers of blades, and a rotation axis of the agitator is parallel to an axial direction of the coagulation bucket.
3. The method of claim 1, wherein a metering pump and a regulating valve are further provided on the pipe between the emulsion reservoir and the coagulation tank for controlling the flow rate of the polymerized emulsion.
4. A method according to any one of claims 1-3, characterized in that the feed opening of the washing tank for feeding washing liquid is higher than the feed opening for feeding material flowing out of the coagulation bucket.
5. A method according to any one of claims 1-3, wherein the dryer is a flash dryer or a spray dryer.
6. The method of claim 5, wherein the dryer is a spray dryer.
7. A method according to any one of claims 1-3, wherein the apparatus system further comprises an automatic packaging machine connected to the vibrating fluid bed for packaging the purified polymer.
8. The method according to claim 1, wherein the method further comprises: and cooling the polymer discharged by the vibrating fluidized bed, and then, feeding the cooled polymer into an automatic packaging machine for packaging.
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