CN114644776B - System and method for recycling polycarbonate powder - Google Patents
System and method for recycling polycarbonate powder Download PDFInfo
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- CN114644776B CN114644776B CN202210467100.XA CN202210467100A CN114644776B CN 114644776 B CN114644776 B CN 114644776B CN 202210467100 A CN202210467100 A CN 202210467100A CN 114644776 B CN114644776 B CN 114644776B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The application belongs to the field of polycarbonate preparation, and relates to a system and a method for recycling polycarbonate powder, wherein the system comprises the following steps: the device comprises a powder recovery device, a devolatilization tower, a condensing system, a phase separator, a powder mixing tank, a powder recovery pump and a polymer buffer tank which are connected in sequence. The outlet of the phase separator is connected with the powder mixing tank; the outlet of the powder mixing tank is connected with the polymer buffer tank. The system is adopted to recycle the polycarbonate powder, and the polycarbonate powder is recycled to prepare the polycarbonate sheet by taking part in the water washing centrifugation and devolatilization drying process again, so that the polycarbonate powder is produced and the powder recycling rate reaches 98 percent. Therefore, the powder disposal problem is effectively solved, the investment of manpower and material resources is reduced, the material waste is reduced, and the production cost is well reduced.
Description
Technical Field
The application belongs to the technical field of polycarbonate preparation, and particularly relates to a system and a method for recycling polycarbonate powder.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the application and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The polycarbonate has better impact strength, light transmittance and electrical insulation, is widely applied to the fields of electronic appliances, medical equipment, food packaging, automobile manufacturing, aerospace, rail transit and the like, and has the highest dosage increase speed in five engineering plastics. The production process flow of the polycarbonate mainly comprises the procedures of reaction synthesis, water washing centrifugation, devolatilization drying, extrusion granulation and the like. However, more polycarbonate powder is produced during the devolatilization and drying process of polycarbonate, and the produced polycarbonate powder cannot be used for subsequent extrusion granulation. At present, more manpower and material resources are required for disposing the polycarbonate powder, so that the recycling of the polycarbonate powder is realized, and the method has important application value.
Through dissolving polycarbonate powder in dichloromethane and preparing the mixed solution, utilize the stirring to improve the dissolution effect, carry out washing centrifugation again to the polycarbonate solution that mixes, take off the drying process of volatilizing, prepare the polycarbonate powder into the thin slice material to effectively solved the powder and handled the problem, reduced manpower, material resources input, reduced the material extravagant simultaneously, reduced manufacturing cost well.
Disclosure of Invention
In order to solve the problems, the application provides a system and a method for recycling polycarbonate powder.
In order to achieve the technical purpose, the application adopts the following technical scheme:
in a first aspect of the present application, there is provided a system for recycling polycarbonate powder comprising: the device comprises a powder recovery device, a devolatilization tower, a condensing system, a phase separator, a powder mixing tank, a powder recovery pump and a polymer buffer tank; the material outlet at the top of the devolatilization tower is sequentially connected with a condensing system, a phase separator, a powder mixing tank, a powder recovery pump and a polymer buffer tank, the material outlet at the bottom of the devolatilization tower is sequentially connected with a primary fluidized bed, a secondary fluidized bed and a ridge drying tower, the primary fluidized bed is sequentially connected with a primary cyclone separator and a powder recovery device, and the secondary fluidized bed is sequentially connected with a secondary cyclone separator and the powder recovery device.
In some embodiments, the powder recovery device is coupled to a powder mixing tank.
In some embodiments, the powder mix tank is connected to a polymer surge tank, a phase separator, respectively.
In some embodiments, a powder feed port is arranged below the powder recovery device, and a powder feed port hand valve is arranged on the powder feed port.
In some embodiments, a dichloromethane recovery pump and a dichloromethane recovery pump outlet valve are arranged between the powder mixing tank and the phase separator.
In some embodiments, both parallel lines of powder mix tank outlet are connected to the polymer buffer tank inlet line.
In some embodiments, a primary cyclone discharge valve is disposed on the primary cyclone outlet conduit.
In some embodiments, a secondary cyclone discharge valve is disposed on the secondary cyclone outlet conduit.
In a second aspect of the present application, there is provided a method for recycling polycarbonate powder, comprising:
opening outlet valves of the primary cyclone separator and the secondary cyclone separator at intervals, collecting polycarbonate powder by using a powder recovery device, and transferring the powder recovery device to a powder mixing tank after sufficient quantity is collected;
adding powder into a powder mixing tank, starting a dichloromethane recovery pump, opening an outlet valve and a regulating valve of the dichloromethane recovery pump, adding dichloromethane separated from a phase separator according to a proportion, and opening a stirrer to prepare uniform mixed solution;
and (3) conveying the mixed solution in the powder mixing tank to a polymer buffer tank, and preparing the polycarbonate sheet through a water washing centrifugation and devolatilization drying process.
In some embodiments, the powder is mixed with methylene chloride at a mass ratio of 10-13%.
The application has the beneficial effects that:
(1) The system is adopted to recycle the polycarbonate powder, the procedures of water washing, centrifugation and devolatilization drying are carried out again, the polycarbonate sheet is recycled and prepared, and the powder recycling rate reaches 98%. The system realizes the production of polycarbonate powder, thereby effectively solving the problem of powder disposal, reducing the investment of manpower and material resources, reducing the material waste and well reducing the production cost.
(2) The device has the advantages of simple structure, convenient operation, low cost, universality and easy mass production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic diagram of a polycarbonate powder recycling system in an embodiment of the application;
wherein, 1, a powder recovery device, 2, a powder feeding port, 3, a powder feeding port hand valve, 4, a powder mixing tank, 5, a powder mixed liquid recovery pump inlet valve, 6, a powder mixed liquid recovery pump, 7, a powder mixed liquid recovery pump reflux valve, 8, a powder mixed liquid recovery pump outlet valve, 9, a polycarbonate polymer solution regulating valve, 10, a polymer buffer tank, 11, a devolatilization tower, 12, a condensing system, 13, a phase separator, 14, a dichloromethane recovery pump, 15, an outlet valve of the dichloromethane recovery pump, 16, a dichloromethane regulating valve, 17, a hot nitrogen regulating valve, 18, a primary fluidized bed, 19, a primary cyclone, 20, a primary cyclone discharging valve, 21, a hot nitrogen regulating valve, 22, a secondary fluidized bed, 23, a secondary cyclone, 24, a secondary cyclone discharging valve, 25 and a ridge drying tower.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
The first aspect of the application provides a system for recycling polycarbonate powder, comprising: the device comprises a powder recovery device, a devolatilization tower, a condensing system, a phase separator, a powder mixing tank, a powder recovery pump and a polymer buffer tank which are connected in sequence.
The powder recovery device is used for collecting the polycarbonate powder separated by the primary cyclone separator and the secondary cyclone separator, collecting enough powder and then transferring the powder to a feed inlet of the powder mixing tank.
The devolatilization tower is used for drying the polycarbonate sheet, dichloromethane and water on the surface of the sheet are evaporated to form mixed gas, the mixed gas enters the condensing system to form condensate, and the phase separator is used for separating condensate condensed by the condensing system.
The polymer buffer tank is used for storing a polymer solution synthesized in the polycarbonate synthesis process and a powder mixed solution.
In some embodiments, the powder recovery device is connected to the primary cyclone, the secondary cyclone outlet line for collecting the polycarbonate powder.
In some embodiments, the powder mixing tank is provided with a feed port, and a hand valve is arranged between the powder mixing tank and the feed port.
In some embodiments, the powder mixing tank is connected to a powder mix recovery pump, and a valve is provided on the pipe. The outlet of the powder mixed liquid recovery pump is connected with a first branch pipeline and a second branch pipeline, the tail end of the first branch pipeline is communicated with the upper end of the powder mixed tank, and the tail end of the second branch pipeline is connected with the polymer buffer tank.
Further, a reflux valve is arranged on the first branch pipeline, and a hand valve for feeding the polymer buffer tank is arranged on the second branch pipeline.
The first branch pipeline is communicated with the upper end of the powder mixing tank, after the powder mixed liquid recycling pump acts, the reflux valve is opened, and the purpose of opening the reflux valve is to prevent the pump from being blocked, so that the pump is damaged.
In some embodiments, the dichloromethane recovery pump outlet is connected with the powder mixing tank, and a pump outlet hand valve and a regulating valve are arranged on the pipeline.
The second aspect of the application provides a method for recycling polycarbonate powder, comprising the following steps:
opening outlet valves of the first-stage cyclone separator and the second-stage cyclone separator, collecting polycarbonate powder by using the powder recovery device, and transferring the powder recovery device to a powder mixing tank after sufficient quantity is collected.
And opening a hand valve of a feeding port, adding the mixture into a powder mixing tank, adding dichloromethane separated by a phase separator according to a proportion, and opening a stirrer of the powder mixing tank to prepare powder mixed liquid. After stirring for a period of time, the mixed solution is taken from the powder mixing tank to analyze chemical indexes and physical states, and whether the recovery standard is reached is determined.
And (3) conveying the mixed solution in the powder mixing tank to a polymer buffer tank, and preparing the polycarbonate sheet through a water washing centrifugation and devolatilization drying process.
In some embodiments, the molecular weight of the sample analysis powder is in the range of 47100-49000, and powder recovery may be performed to prepare a mixed liquor.
In some embodiments, after stirring in the powder mixing tank for 1 hour, detecting the dispersity of the mixed solution between 2 and 3, the yellow index is less than or equal to 0.75, starting the powder recovery pump, and controlling the flow rate to reach 0.5m 3 /h。
In some embodiments, the four-stage heavy phase molecular weight, dispersity, and polycarbonate flake yellow index change are tracked after the powder mix tank mix is delivered to the polymer buffer tank.
The application will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Example 1
(1) And opening a first-stage cyclone separator discharging valve 20 and a second-stage cyclone separator discharging valve 24, collecting polycarbonate powder by using a powder recovery device, taking the powder to analyze the molecular weight after the powder is collected, sampling, recording the molecular weight of the four-stage heavy phase analysis in the water washing and centrifuging process, and determining that the powder can be recovered according to the fact that the molecular weight of the powder is the same as the molecular weight of the four-stage heavy phase. And transferring the powder recovery device to a powder mixing tank top platform.
(2) The bottom hand valve 3 of the feed opening 2 is opened, and powder is added into the powder mixing tank 4. The methylene chloride recovery pump 14 was started, and the methylene chloride separated by the phase separator 13 was added in proportion by opening the methylene chloride pump outlet hand valve 15 and the methylene chloride regulating valve 16. Starting a powder mixing tank stirrer to prepare powder mixed liquid, and sampling and analyzing the dispersity and the polycarbonate concentration of the mixed liquid after uniform stirring.
(3) The front hand valve 5 of the powder mixed solution recovery pump is opened, the powder mixed solution recovery pump 6 is started, the reflux regulating valve 7 of the powder mixed solution recovery pump is opened, the outlet hand valve 8 of the powder mixed solution pump is opened, and the polymer solution regulating valve 9 of the polycarbonate synthesis process is opened, so that the powder mixed solution and the polymer solution are mixed in the polymer buffer tank 10.
(4) After the powder mixed solution is added into the polymer buffer tank 10, the molecular weight and the yellow index of the quaternary heavy phase in the water washing and centrifuging process are tracked and sampled, and the change of the yellow index of the flake of the roof ridge drying tower is tracked.
(5) And observing and recording the back pressure change condition of the coil pipe in the devolatilization drying process.
The powder is taken to analyze the molecular weight of the powder after the powder is collected to the amount, and the powder quality reaches 200Kg.
The molecular weight of the powder is in the range of 47100-49000 by sampling analysis. Sampling and analyzing the heavy phase molecular weight, the dispersity and the yellow index of the four-stage centrifugal machine, wherein the heavy phase molecular weight is in the range of 47500-50000, the dispersity is between 2 and 3, and the yellow index is less than 0.75. According to the molecular weight of the powder is similar to that of the quaternary heavy phase, the powder can be recovered, and the recovery utilization rate of the polycarbonate powder can reach 98%.
When a powder mixing tank stirrer is started to prepare powder mixed solution, after stirring for 1 hour, sampling and analyzing that the dispersity of the mixed solution is between 2 and 3 and the concentration of the polycarbonate polymer is between 10.3 and 12.5 percent. Sampling and recording that the yellow index of the roof drying tower flake is less than or equal to 0.75.
Starting the powder recovery pump, and controlling the flow to be 0.5m 3 /h。
After the powder mixed solution is added into the polymer buffer tank, the molecular weight and the yellow index of the quaternary heavy phase in the water washing and centrifuging process are tracked and detected, and the change of the yellow index of the flake of the roof drying tower is tracked without obvious change.
And the back pressure change condition of the devolatilization unit coil pipe is tracked and observed, and the back pressure change condition does not have obvious change.
Example 2
A system for recycling polycarbonate powder comprising: a powder recovery device 1, a devolatilization tower 11, a condensing system 12, a phase separator 13, a powder mixing tank 4, a powder recovery pump and a polymer buffer tank 10; the top of the devolatilization tower 11 is sequentially connected with the condensing system 12, the phase separator 13, the powder mixing tank 4, the powder recovery pump and the polymer buffer tank 10, the bottom of the devolatilization tower 11 is sequentially connected with the primary fluidized bed 18, the secondary fluidized bed 22 and the ridge drying tower 25, the primary fluidized bed 18 is sequentially connected with the primary cyclone separator 19 and the powder recovery device 1, and the secondary fluidized bed 22 is sequentially connected with the secondary cyclone separator 23 and the powder recovery device 1.
In some embodiments, the powder recovery device 1 is connected to a powder mixing tank 4.
In some embodiments, the powder mixing tank 4 is connected to a polymer buffer tank 10, a phase separator 13, respectively.
In some embodiments, a powder feeding port 2 is arranged below the powder recycling device 1, and a powder feeding port hand valve 3 is arranged on the powder feeding port 2.
In some embodiments, a dichloromethane recovery pump 14 and a dichloromethane recovery pump outlet valve 15 are provided between the powder mixing tank 4 and the phase separator 13.
In some embodiments, both parallel lines at the outlet of the powder mix tank 4 are connected to the inlet line of the polymer buffer tank 10.
In some embodiments, a primary cyclone discharge valve 20 is disposed on the outlet pipe of the primary cyclone 19.
In some embodiments, a secondary cyclone discharge valve 24 is disposed on the secondary cyclone 23 outlet conduit.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present application, and the present application is not limited to the above-mentioned embodiments, but may be modified or substituted for some of them by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. A system for recycling polycarbonate powder, comprising: the device comprises a powder recovery device, a devolatilization tower, a condensing system, a phase separator, a powder mixing tank, a powder recovery pump and a polymer buffer tank; the material outlet at the top of the devolatilization tower is sequentially connected with a condensing system, a phase separator, a powder mixing tank, a powder recovery pump and a polymer buffer tank, the material outlet at the bottom of the devolatilization tower is sequentially connected with a primary fluidized bed, a secondary fluidized bed and a ridge drying tower, the primary fluidized bed is sequentially connected with a primary cyclone separator and a powder recovery device, and the secondary fluidized bed is sequentially connected with a secondary cyclone separator and a powder recovery device;
a dichloromethane recovery pump and an outlet valve of the dichloromethane recovery pump are arranged between the powder mixing tank and the phase separator.
2. The polycarbonate powder recycling system of claim 1, wherein the powder recycling device is connected to a powder mixing tank.
3. The polycarbonate powder recycling system of claim 2, wherein the powder mixing tank is connected to a polymer buffer tank and a phase separator, respectively.
4. The polycarbonate powder recycling system of claim 2, wherein a powder feed port is arranged below the powder recycling device, and a powder feed port hand valve is arranged on the powder feed port.
5. The polycarbonate powder recycling system of claim 2, wherein both parallel lines of the powder mixing tank outlet are connected to the polymer buffer tank inlet line.
6. The polycarbonate powder recycling system of claim 2, wherein the primary cyclone outlet pipe is provided with a primary cyclone discharge valve.
7. The polycarbonate powder recycling system of claim 2, wherein the secondary cyclone outlet pipe is provided with a secondary cyclone discharge valve.
8. A method of recycling polycarbonate powder based on a system for recycling polycarbonate powder as defined in claim 1, comprising:
opening outlet valves of the primary cyclone separator and the secondary cyclone separator at intervals, collecting polycarbonate powder by using a powder recovery device, and transferring the powder recovery device to a powder mixing tank after sufficient quantity is collected;
adding powder into a powder mixing tank, starting a dichloromethane recovery pump, opening an outlet valve and a regulating valve of the dichloromethane recovery pump, adding dichloromethane separated from a phase separator according to a proportion, and opening a stirrer to prepare uniform mixed solution;
and (3) conveying the mixed solution in the powder mixing tank to a polymer buffer tank, and preparing the polycarbonate sheet through a water washing centrifugation and devolatilization drying process.
9. The method for recycling polycarbonate powder according to claim 8, wherein the powder is mixed with methylene chloride in a mass ratio of 10 to 13%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210467100.XA CN114644776B (en) | 2022-04-29 | 2022-04-29 | System and method for recycling polycarbonate powder |
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| CN202210467100.XA CN114644776B (en) | 2022-04-29 | 2022-04-29 | System and method for recycling polycarbonate powder |
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| CN114644776B true CN114644776B (en) | 2023-09-01 |
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