CN104910401B - A kind of system and method being separated polycarbonate and solvent - Google Patents
A kind of system and method being separated polycarbonate and solvent Download PDFInfo
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- CN104910401B CN104910401B CN201510185356.1A CN201510185356A CN104910401B CN 104910401 B CN104910401 B CN 104910401B CN 201510185356 A CN201510185356 A CN 201510185356A CN 104910401 B CN104910401 B CN 104910401B
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Abstract
The present invention relates to a kind of system and method being separated polycarbonate and solvent, the dichloromethane solution of polycarbonate and superheated vapour are respectively along the axis direction of mixing nozzle and the mixing zone mixing entering mixing nozzle perpendicular to the axis direction of mixing nozzle, the wall that mixed material enters distiller condenses into polycarbonate drop, polycarbonate drop forms polycarbonate sheet under gravity, and polycarbonate sheet is blown in polycarbonate sheet and solvent initial gross separation system carries out the initial gross separation with dichloromethane solvent; Then, polycarbonate sheet enters in steam stripped tower and thoroughly removes residual dichloromethane solvent.There are mixing tank and coagulation pipe in the present invention, make polycarbonate form thin slice, convenient transport and storage; Steam stripped tower in the present invention uses steam stripped, environmental protection; In the present invention polycarbonate through in flakes and with the initial gross separation of solvent after only experienced by one-level stripping, stripping step is simple, energy-saving and cost-reducing.
Description
Technical field
The present invention is specifically related to a kind of system and method being separated polycarbonate and solvent.
Background technology
Polycarbonate dichloromethane solution, many employing toluene strippings, toluene contacts except desolventizing in a counter-current configuration in stripping tower with solution; This technique generally will through three grades of strippings, and strength of solution is concentrated into 30% by the first step, and strength of solution is concentrated into 80% by the second stage, and residue methylene dichloride and toluene are discharged at forcing machine; This process characteristic is: stripping step is tediously long, and energy consumption is high, and forcing machine exhaust loads is large; Use toluene stripping, there is the risk of environmental pollution; And storage is not easily carried in the existence of polycarbonate powder, and there is the risk of dust explosion.
Summary of the invention
The object of the invention is the deficiency for overcoming toluene steam stripping technique in prior art, provide a kind of system and method being separated polycarbonate and solvent, the present invention utilizes superheated vapour to be separated with methylene dichloride polycarbonate.
For achieving the above object, the present invention adopts following technical proposals:
A kind of system being separated polycarbonate and solvent, comprise solution storage device, polycarbonate system in blocks, polycarbonate sheet and solvent initial gross separation system, steam stripped tower, polycarbonate sheet storing unit and exhaust treatment system, wherein, described solution storage device, polycarbonate system in blocks, polycarbonate sheet are connected successively with solvent initial gross separation system and steam stripped tower, and described polycarbonate sheet storing unit is all connected with steam stripped tower with exhaust treatment system.
Preferably, described polycarbonate system in blocks comprises mixing nozzle for making the dichloromethane solution of polycarbonate mix with superheated vapour and for making polycarbonate condense distiller in blocks, described mixing nozzle and distiller are interconnected, wherein, described mixing nozzle is connected with solution storage device by fresh feed pump, and described distiller is connected with polycarbonate sheet dehumidification system.
Preferably, described polycarbonate sheet and solvent initial gross separation system comprise interconnective drying tube and cyclonic separator, and wherein, drying tube is connected with described distiller, and cyclonic separator is connected with described steam stripped tower.
Preferably, described exhaust treatment system comprises interconnective condenser and phase separator, and wherein, condenser is connected with described steam stripped tower.
A kind of method being separated polycarbonate and solvent, comprise the steps: the dichloromethane solution of polycarbonate and superheated vapour respectively along the axis direction of mixing nozzle and the mixing zone mixing entering mixing nozzle perpendicular to the axis direction of mixing nozzle, the wall that mixed material enters distiller condenses into polycarbonate drop, polycarbonate drop forms polycarbonate sheet under gravity, polycarbonate sheet is blown in polycarbonate sheet and solvent initial gross separation system carries out the initial gross separation with dichloromethane solvent, then, polycarbonate sheet enters in steam stripped tower and thoroughly removes residual dichloromethane solvent.
Preferably, the dichloromethane solution of described polycarbonate and the mass ratio of superheated vapour are 2:1.
Preferably, the temperature of described superheated vapour is 120 DEG C, and pressure is 1.2MPa.
Preferably, described polycarbonate sheet is removed methylene dichloride and is remained in steam stripped tower, makes the content of methylene dichloride in polycarbonate sheet be less than 1ppm.
Preferably, the pressure of steam stripped tower low pressure steam is 0.3MPa.
Preferably, described low-pressure steam enters at the bottom of the tower of steam stripped tower.
Advantageous Effects of the present invention is:
1, there are mixing tank and coagulation pipe in the present invention, make polycarbonate form thin slice, convenient transport and storage, and eliminate the risk of dust explosion;
2, the steam stripped tower in the present invention uses steam stripped, environmental protection;
3, in the present invention polycarbonate through in flakes and with the initial gross separation of dichloromethane solvent after only experienced by one-level stripping, vapour
Put forward step simple, energy-saving and cost-reducing.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Wherein, 1, solution storage device, 2, fresh feed pump, 3, mixing nozzle, 4, distiller, 5, drying tube, 6, cyclonic separator, 7, steam stripped tower, 8, polycarbonate sheet storing unit, 9, condenser, 10, phase separator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, a kind of system being separated polycarbonate and solvent, comprise solution storage device 1, polycarbonate system in blocks, polycarbonate sheet and solvent initial gross separation system, steam stripped tower 7, polycarbonate sheet storing unit 8 and exhaust treatment system, wherein, described solution storage device 1, polycarbonate system in blocks, polycarbonate sheet are connected successively with solvent initial gross separation system and steam stripped tower 7, and described polycarbonate sheet storing unit 8 is all connected with steam stripped tower 7 with exhaust treatment system.
Polycarbonate system in blocks comprises the mixing nozzle 3 for making the dichloromethane solution of polycarbonate mix with superheated vapour and the distiller 4 for making polycarbonate condense in blocks, wherein, described mixing nozzle 3 and distiller 4 are interconnected, described mixing nozzle 3 is connected with solution storage device 1 by fresh feed pump 2, and described distiller 4 is connected with polycarbonate sheet dehumidification system.
Polycarbonate sheet and solvent initial gross separation system comprise interconnective drying tube 5 and cyclonic separator 6, and wherein, drying tube 5 is connected with described distiller 4, and cyclonic separator 6 is connected with described steam stripped tower 7.
Described exhaust treatment system comprises interconnective condenser 9 and phase separator 10, and wherein, condenser 9 is connected with described steam stripped tower 7.
A kind of method being separated polycarbonate and solvent, comprise the steps: the dichloromethane solution of polycarbonate and superheated vapour respectively along the axis direction of mixing nozzle 3 and the mixing zone mixing entering mixing nozzle 3 perpendicular to the axis direction of mixing nozzle 3, mixed material enters in distiller 4 and condenses into polycarbonate drop, polycarbonate drop forms polycarbonate sheet under gravity, polycarbonate sheet is blown in polycarbonate sheet and solvent initial gross separation system carries out initial gross separation with dichloromethane solvent, then, polycarbonate sheet enters in steam stripped tower 7 and thoroughly removes residual methylene dichloride.
Wherein, the dichloromethane solution of polycarbonate and the mass ratio of superheated vapour are 2:1, and polycarbonate sheet is removed methylene dichloride and remained in steam stripped tower 7, and make the content of methylene dichloride be less than 1ppm, low-pressure steam enters at the bottom of the tower of steam stripped tower 7.
Methylene dichloride in steam stripped tower 7 is separated through phase separator 10 with the mixed tail gas of steam, recycle.
Described polycarbonate sheet enters polycarbonate sheet storing unit 8 and stores after steam stripped tower 7 stripping.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but the restriction not to invention protection domain; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still in protection scope of the present invention.
Claims (7)
1. one kind is separated the system of polycarbonate and solvent, it is characterized in that: comprise solution storage device, polycarbonate system in blocks, polycarbonate sheet and solvent initial gross separation system, steam stripped tower, polycarbonate sheet storing unit and exhaust treatment system, wherein, described solution storage device, polycarbonate system in blocks, polycarbonate sheet are connected successively with solvent initial gross separation system and steam stripped tower, and described polycarbonate sheet storing unit is all connected with steam stripped tower with exhaust treatment system;
Described polycarbonate system in blocks comprises mixing nozzle for making the dichloromethane solution of polycarbonate mix with superheated vapour and for making polycarbonate condense distiller in blocks, described mixing nozzle and distiller are interconnected, wherein, described mixing nozzle is connected with solution storage device by fresh feed pump, and described distiller is connected with solvent initial gross separation system with described polycarbonate sheet;
Described polycarbonate sheet and solvent initial gross separation system comprise interconnective drying tube and cyclonic separator, and wherein, drying tube is connected with described distiller, and cyclonic separator is connected with described steam stripped tower;
Described exhaust treatment system comprises interconnective condenser and phase separator, and wherein, condenser is connected with described steam stripped tower.
2. one kind is separated the method for polycarbonate and solvent, comprise the steps: the dichloromethane solution of polycarbonate and superheated vapour respectively along the axis direction of mixing nozzle and the mixing zone mixing entering mixing nozzle perpendicular to the axis direction of mixing nozzle, the wall that mixed material enters distiller condenses into polycarbonate drop, polycarbonate drop forms polycarbonate sheet under gravity, and polycarbonate sheet is blown in polycarbonate sheet and solvent initial gross separation system carries out the initial gross separation with dichloromethane solvent; Then, polycarbonate sheet enters in steam stripped tower and thoroughly removes residual dichloromethane solvent.
3. method according to claim 2, is characterized in that: the dichloromethane solution of described polycarbonate and the mass ratio of superheated vapour are 2:1.
4. method according to claim 3, is characterized in that: the temperature of described superheated vapour is 120 DEG C, and pressure is 1.2MPa.
5. method according to claim 2, is characterized in that: described polycarbonate sheet is removed methylene dichloride and remained in steam stripped tower, makes the content of methylene dichloride in polycarbonate sheet be less than 1ppm.
6. method according to claim 5, is characterized in that: the pressure of steam stripped tower low pressure steam is 0.3MPa.
7. method according to claim 6, is characterized in that: described low-pressure steam enters at the bottom of the tower of steam stripped tower.
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| CN201510185356.1A CN104910401B (en) | 2015-04-17 | 2015-04-17 | A kind of system and method being separated polycarbonate and solvent |
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| CN201510185356.1A CN104910401B (en) | 2015-04-17 | 2015-04-17 | A kind of system and method being separated polycarbonate and solvent |
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| CN104910401A CN104910401A (en) | 2015-09-16 |
| CN104910401B true CN104910401B (en) | 2016-04-06 |
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| CN112595033B (en) * | 2020-12-10 | 2022-11-08 | 万华化学集团股份有限公司 | Preparation method of polycarbonate powder with stable color |
| CN114262431B (en) * | 2021-11-29 | 2023-05-23 | 聊城鲁西聚碳酸酯有限公司 | Water-saving and consumption-reducing method in polycarbonate production process |
| CN114712885A (en) * | 2022-06-08 | 2022-07-08 | 沧州大化股份有限公司 | Polycarbonate solution processing apparatus and polycarbonate waste recycling dichloromethane device |
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| DE19849004A1 (en) * | 1998-10-24 | 2000-04-27 | Bayer Ag | High purity polycarbonate is produced using coalescer with hydrophilic packing to separate wash liquid from organic product solution after first washing step |
| JP2005330188A (en) * | 2004-05-18 | 2005-12-02 | Tsukishima Kikai Co Ltd | Method for producing bisphenol a and apparatus for production |
| CN101928387B (en) * | 2009-06-24 | 2012-05-30 | 中国海洋石油总公司 | Aliphatic polycarbonate washing coagulation devolatilization method and specific device thereof |
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Inventor after: Sun Caihong Inventor after: Zhang Jincheng Inventor after: Zhang Wen Inventor after: Zhang Liangfang Inventor after: Dong Baotian Inventor after: Niu Jun Inventor before: Zhang Jincheng Inventor before: Zhang Wen Inventor before: Zhang Liangfang Inventor before: Dong Baotian Inventor before: Niu Jun |