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Method for drying poly carbonate (PC)

A polycarbonate, drying technology, applied in the direction of drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of complex equipment structure, long drying time, low drying efficiency, etc., and achieve controllable residence time and avoid Inflammable and explosive, avoiding the effect of accident hazards

Inactive Publication Date: 2012-08-01
甘肃银光聚银化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dichloromethane solvent remains in polycarbonate, which will decompose at high temperature to generate hydrochloric acid, which will severely corrode pipeline equipment
The spray drying + fluidized bed combination method has problems such as high equipment investment costs, complex equipment structure, and poor operational stability.
Centrifugal separation + paddle combination method has the problems of high investment cost of centrifuge equipment and difficult maintenance. The paddle dryer has low drying efficiency for materials with high water content requirements, requires multiple equipment to be used in series, and has long drying time.
Therefore, these more traditional drying methods are not suitable for the needs of modern fine production

Method used

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  • Method for drying poly carbonate (PC)
  • Method for drying poly carbonate (PC)

Examples

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Effect test

Embodiment 1

[0021] Example 1: see figure 1

[0022] A method for drying polycarbonate, which is characterized in that polycarbonate powder is dried by a combination of one-stage airflow drying and two-stage fluidized bed drying, and the specific steps are as follows:

[0023] a. The dichloromethane solvent in the polycarbonate powder is removed and recovered by primary air drying: the polycarbonate wet powder generated by the steam precipitation method, that is, the PC powder, is passed through the star feeder 1 and fed The tee 2 enters the air dryer 3, and the residence time is 2.5~4.5S; at the same time, the superheated steam of 0.5~1.0Mpa is sent into the air dryer 3, and the solid-gas mass ratio of the PC powder to the superheated steam is 1~ 10. Control the temperature of the airflow dryer 3 at 100-130°C. After the PC wet powder is fluidized and dried by water vapor in the airflow dryer 3, it is sent to the primary cyclone separator 4 to complete the primary airflow drying. At this ...

Embodiment 2

[0031] Example 2, see figure 1 :

[0032]The previous process uses steam spraying method to generate 128kg / h of PC powder, which contains 25.6kg / h of moisture and 6.4kg / h of organic solvent, and enters the airflow drying through star feeder 1 and feeding tee 2 3, the residence time is 2.5 ~ 4.5S; at the same time, 0.5 ~ 1.0Mpa superheated steam is sent to the air dryer 3, the solid-gas mass ratio of PC powder to superheated steam is 1 ~ 10, and the air flow dryer is controlled. 3. The temperature is 100-130°C. After the PC wet powder is fluidized and dried by water vapor in the airflow dryer 3, it is transported to the first-stage cyclone separator 4 to complete the first-stage airflow drying. At this time, the water content in the PC powder 5-10%, the methylene chloride solvent content is 10-50ppm; the dichloromethane solvent in the PC powder is vaporized and then enters the solvent recovery system after being treated by the first-stage bag filter 5; the powder enters the se...

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PUM

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Abstract

The invention relates to a method for drying polycarbonate (PC), which is characterized in that PC powder is subjected to drying treatment by adopting a one-stage pneumatic drying and two-stage fluid bed drying combined way, and overhot vapor is used as the drying medium in the one-stage drying process; and hot nitrogen gas is used as the drying medium in the fluid bed drying process, the nitrogen gas is recycled through processes such as washing, cooling, dehumidifying, pressurizing, heating and the like, and the PC powder in washing water is recycled. The water content of a product dried in the three-stage draying combined way can meet the later processing requirement, accident potentials such as dust explosion and the like caused in the drying process of the PC powder can be effectively solved, and the quality of the product can be improved.

Description

technical field [0001] The invention relates to a production method of polycarbonate, which belongs to the field of chemical industry, in particular to a drying process in the production method of polycarbonate. Background technique [0002] Polycarbonate resin (referred to as PC) prepared by interfacial polycondensation of bisphenol A and phosgene is an engineering plastic with excellent comprehensive properties, with high transparency, excellent impact strength, heat resistance, cold resistance, and dimensional stability It is widely used in various applications such as automotive parts, optical parts, etc. due to its electrical insulation properties. The production process of polycarbonate is mainly composed of reaction synthesis, washing and separation, concentration gas analysis, drying and granulation. In the polycarbonate production process, the drying process is an important operation unit, and the drying effect directly affects the product quality. PC wet powder p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/06F26B3/08
Inventor 马瑞进孔令启李晓明岳金彩强光明谈明传
Owner 甘肃银光聚银化工有限公司
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