CN103640108B - A kind of method of dry polycarbonate - Google Patents
A kind of method of dry polycarbonate Download PDFInfo
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- CN103640108B CN103640108B CN201310678415.XA CN201310678415A CN103640108B CN 103640108 B CN103640108 B CN 103640108B CN 201310678415 A CN201310678415 A CN 201310678415A CN 103640108 B CN103640108 B CN 103640108B
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Abstract
A kind of method that the present invention relates to dry polycarbonate, it is characterised in that comprise the steps: a, first pass through blade dryer dichloromethane solvent in Merlon powder is removed and reclaims；B, with fluidized bed dryer, Merlon powder carried out depth drying again, use cycling hot nitrogen as fluidized bed drying medium.Use two-stage drying process that Merlon powder is dried process, while reaching drying effect, efficiently solve the recovery problem of dichloromethane solvent in Merlon powder dry run, it is to avoid the accident potential that Merlon drying system dust is inflammable and explosive.Improve the security of Merlon drying system.
Description
Technical field
The invention belongs to chemical field, a kind of method being specifically related to dry polycarbonate.
Background technology
Polycarbonate plastic has the performances such as excellent transparency, impact resistance, resisting heat distortion, good weatherability, has the most become one of kind with fastest developing speed in engineering plastics.Polycarbonate plastic be machined with injection, extrude, mold, the method such as blowing.Feed moisture content is required extremely strict by polycarbonate plastic process, and when being dried bad to polycarbonate starting material, in raw material, micro-moisture at high temperature adds trade union and makes polycarbonate article produce gonorrhoea color and luster, filamentary silver and bubble, has a strong impact on the serviceability of goods.
The Merlon powder that technique produces at present contains the compositions such as Merlon, moisture content, dichloromethane, dichloromethane remains in Merlon, at high temperature can decompose generation HCl, hydrochloric acid is generated in the presence of having moisture, following apparatus pipeline can be produced heavy corrosion, Merlon powder there is also the danger of dust explosion in the presence of air and dichloromethane in dry run in addition.These characteristics determines to select Merlon drying mode to have certain particularity, and drying mode needs to take into account desolvation and dry moisture two aspect characteristic.
In industrial production, the major way of dry polycarbonate has spray drying+rake to be dried combining form, centrifugation+roller drying combining form etc..The problems such as spray drying+rake is dried combination and there is equipment investment costly, and equipment structure is complicated, operational stability is poor.It is high to there is centrifuge apparatus investment cost in centrifugation+cylinder combination, problem difficult in maintenance, and the dry materials that drum dryer exists for product water content requirement is high is inefficient, drying time the problem such as length.Therefore these more traditional drying modes are all not applied for modernizing the needs of lean product.
Summary of the invention
It is an object of the invention to avoid the defect of prior art, it is provided that a kind of method of dry polycarbonate.
For achieving the above object, the technical scheme that the present invention takes is: a kind of method of dry polycarbonate, it is characterised in that comprise the steps:
A, first pass through blade dryer dichloromethane solvent in Merlon powder is removed and reclaims；Avoid dichloromethane solvent pyrolytic to generate hydrochloric acid, thus reduce and equipment installation is corroded, following apparatus and pipeline are effectively protected；
B, with fluidized bed dryer, Merlon powder is carried out depth drying again, use cycling hot nitrogen as fluidized bed drying medium, can effectively solve the problem that Merlon dust hidden peril of explosion in dry run, recycling nitrogen can effectively reduce energy consumption simultaneously, cost-effective.
Concrete technology is as follows；
One-level is dried: the Merlon wet mash that previous operation generates enters blade dryer (1) through star feeder, it is passed through Low pressure steam in blade dryer (1) hollow paddle blade and apparatus casing chuck, Merlon wet mash is dried in blade dryer (1), dichloromethane solvent in Merlon powder and surface water are delivered to solvent scrubber (6) by air-introduced machine (5) after being vaporized and carry out wet dedusting, cooling, and the dichloromethane after cooling enters condenser for solvent (7) condensation Posterior circle and uses;
Secondary drying: the Merlon powder being dried through one-level enters fluidized bed dryer (2) through star-shaped feeder, the separated rear nitrogen circulation scrubbing tower (3) that enters of powder in fluidized bed dryer (2) exhaust carries out wet dedusting, cooling, through air blast (4) laggard fluidized bed drier (2) of pressurizeing, PC powder is carried out depth drying after nitrogen dehumidifying, it is dried to require discharging after water content, thus completes the dry run to Merlon powder.
Tail gas in dry run, through dedusting, cooling, removes the water in nitrogen and dust, and washing is isolated dust and entered powder recovery system.
Drier preferred horizontal boiling bed, is provided with the dividing plate of interior heat(ing) coil in ebullated bed, improve the efficiency of heating surface；Ebullated bed fluidized plate area ensures that material has enough time of staying.
The invention has the beneficial effects as follows:
(1) use two-stage drying process that Merlon powder is dried process, while reaching drying effect, efficiently solve the recovery problem of dichloromethane solvent in Merlon powder dry run, it is to avoid the accident potential that Merlon drying system dust is inflammable and explosive.Improve the security of Merlon drying system.
(2) present invention uses blade dryer and fluidized bed dryer combination, and blade dryer has that the time of staying is short, heat transfer coefficient is high, energy consumption is low, few feature carried secretly by powder, uses overheated steam to be conducive to dichloromethane solvent to reclaim as heat carrier；Fluidized bed dryer has a time of staying and can control, is applicable to the heat sensitive materials such as dry polycarbonate.Equipment uses the most multistage gathering dust to dust, meets the requirement of environmental protection.
(3) nitrogen system uses " separating cooling washing pressurized, heated " close circulation technology, it is achieved that the low moisture content of circulating nitrogen gas, low temperature, reduces the consumption of nitrogen, improves drying efficiency, reduce production cost.
Accompanying drawing explanation
Fig. 1 is present invention process schematic flow sheet；
In figure: 1 blade dryer；2 fluidized bed dryers；3 nitrogen circulation scrubbing towers；4 air blasts；5 air-introduced machines；6 solvent scrubber；7 condensers for solvent.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
Embodiment 1:
Previous operation generates the Merlon powder of 500kg/h, comprises a certain amount of moisture and solvent in powder.Merlon wet mash enters blade dryer 1 through star-shaped feeder, it is passed through 0.1 ~ 0.6Mpa steam in the hollow paddle blade of blade dryer 1 and apparatus casing chuck, dried through blade dryer 1, in Merlon powder, water content is 1 ~ 10%, dichloromethane content 100 ~ 1000ppm.Powder enters fluidized bed dryer 2 through star-shaped feeder.The dichloromethane solvent being vaporized is delivered to solvent scrubber 6 by air-introduced machine 5 after dedusting and carries out wet dedusting, cooling, and the dichloromethane after cooling enters condenser 7 and condenses Posterior circle use.Enter the Merlon powder of fluidized bed dryer 2, make final water content control at below 1000ppm through strong mass-and heat-transfer process, now dichloromethane content 10 ~ 100ppm, enter subsequent processing through discharge gate.The powder carried in one-level blade dryer and the exhaust of secondary streams bed returns in respective drier respectively through after dedusting laggard row gas solid separation.The dividing plate of carrying vapour chuck is set in secondary streams bed, in chuck, is passed through 0.1 ~ 0.6Mpa steam.Discharge gas after bag-type dust enters nitrogen circulation scrubbing tower 3 and carries out wet dedusting, simultaneously to discharge gas cooling.Being heated to 150 ~ 200 DEG C through air blast pressurization, heater after dehumidifying enter secondary streams bed dryers 2 wet mash carries out depth drying, dry tail gas reenters washing, pressurizes, heats link, completes nitrogen circulation use.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (3)
1. the method for a dry polycarbonate, it is characterised in that comprise the steps:
A, first pass through blade dryer dichloromethane solvent in Merlon powder is removed and reclaims；
B, with fluidized bed dryer, Merlon powder carried out depth drying again, use cycling hot nitrogen as fluidized bed drying medium；
Concrete technology is as follows:
One-level is dried: the Merlon wet mash that previous operation generates enters blade dryer (1) through star feeder, the steam of 0.1-0.6Mpa it is passed through in blade dryer (1) hollow paddle blade and apparatus casing chuck, Merlon wet mash is dried in blade dryer (1), dichloromethane solvent in Merlon powder and surface water are delivered to solvent scrubber (6) by air-introduced machine (5) after being vaporized and carry out wet dedusting, cooling, and the dichloromethane after cooling enters condenser for solvent (7) condensation Posterior circle and uses;
Secondary drying: the Merlon powder being dried through one-level enters fluidized bed dryer (2) through star-shaped feeder, the separated rear nitrogen circulation scrubbing tower (3) that enters of powder in fluidized bed dryer (2) exhaust carries out wet dedusting, cooling, through air blast (4) laggard fluidized bed drier (2) of pressurizeing, PC powder is carried out depth drying after nitrogen dehumidifying, it is dried to require discharging after water content, thus completes the dry run to Merlon powder.
The method of a kind of dry polycarbonate the most as claimed in claim 1, it is characterised in that the tail gas in dry run, through dedusting, cooling, removes the water in nitrogen and dust, and washing is isolated dust and entered powder recovery system.
The method of a kind of dry polycarbonate the most as claimed in claim 1, it is characterised in that described fluidized bed dryer (2) preferably horizontal boiling bed, is provided with the dividing plate of interior heat(ing) coil, improves the efficiency of heating surface in ebullated bed；Ebullated bed fluidized plate area ensures that material has enough time of staying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310678415.XA CN103640108B (en) | 2013-12-14 | 2013-12-14 | A kind of method of dry polycarbonate |
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| CN201310678415.XA CN103640108B (en) | 2013-12-14 | 2013-12-14 | A kind of method of dry polycarbonate |
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| CN103640108A CN103640108A (en) | 2014-03-19 |
| CN103640108B true CN103640108B (en) | 2016-08-17 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102111605B1 (en) * | 2016-12-26 | 2020-05-15 | 주식회사 엘지화학 | Method for treating solvent included in waste water |
| CN107062803A (en) * | 2017-03-09 | 2017-08-18 | 福建省环境工程有限公司 | A kind of device for drying carbon black |
| CN108180700B (en) * | 2017-12-22 | 2019-11-22 | 西安近代化学研究所 | A kind of drying means of easy distillation organic solid powder |
| CN108286886A (en) * | 2018-03-28 | 2018-07-17 | 梧州黄埔化工药业有限公司 | A kind of method and apparatus of oxalic acid drying |
| 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 |
| CN115200318B (en) * | 2021-04-14 | 2024-01-26 | 济南中昌干燥设备有限公司 | High-humidity material drying method |
| CN114644776B (en) * | 2022-04-29 | 2023-09-01 | 聊城鲁西聚碳酸酯有限公司 | System and method for recycling polycarbonate powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881550A (en) * | 2010-06-30 | 2010-11-10 | 国家粮食局科学研究院 | Low-temperature high-efficiency fluidization combined drying process and equipment thereof |
| CN102620526A (en) * | 2012-03-16 | 2012-08-01 | 甘肃银光聚银化工有限公司 | Method for drying poly carbonate (PC) |
| CN102645085A (en) * | 2012-02-24 | 2012-08-22 | 青岛科技大学 | Method for continuously drying polycarbonate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881550A (en) * | 2010-06-30 | 2010-11-10 | 国家粮食局科学研究院 | Low-temperature high-efficiency fluidization combined drying process and equipment thereof |
| CN102645085A (en) * | 2012-02-24 | 2012-08-22 | 青岛科技大学 | Method for continuously drying polycarbonate |
| CN102620526A (en) * | 2012-03-16 | 2012-08-01 | 甘肃银光聚银化工有限公司 | Method for drying poly carbonate (PC) |
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