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Process for continuous production of polycarbonate by transesterification method

A polycarbonate and transesterification technology, which is used in the production of polycarbonate by transesterification and the continuous production of polycarbonate by transesterification. , Unstable transportation of viscous materials, etc.

Active Publication Date: 2012-07-11
CHINA BLUESTAR CHENGRAND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The present invention aims to solve the poor heat and mass transfer effect of the high-temperature viscous melt in the vacuum state in the polycondensation process of the continuous production of polycarbonate in the prior art, and the by-products, low-molecular substances, and viscous materials cannot be quickly eliminated. To solve the problem of unstable transportation and low quality of polycarbonate products, a process for continuous production of polycarbonate by transesterification is provided

Method used

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  • Process for continuous production of polycarbonate by transesterification method
  • Process for continuous production of polycarbonate by transesterification method
  • Process for continuous production of polycarbonate by transesterification method

Examples

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Embodiment 1

[0083] A process for the continuous production of polycarbonate by transesterification, comprising carrying out transesterification reaction in transesterification reactor 103, polycondensation reaction in polycondensation reactor 104 and Finishing reaction is carried out in the screw reactor 105 to produce polycarbonate, wherein the transport of materials adopts a delivery pump 108, which is characterized in that at least one of the polycondensation reactors 104 is a horizontal propulsion reactor with the following structure: comprising a shell Body 201, motor 202, stirring shaft 203, feed port 204, discharge port 205 and vacuum port 206, the feed port 204 is set on the upper part of the front end of the housing 201, and the discharge port 205 is set behind the bottom of the housing 201 end, the vacuum port 206 is set on the upper side of the housing 201, the stirring shaft 203 runs through the housing 201, the end of the stirring shaft 203 extending out of the housing 201 is ...

Embodiment 2

[0085] According to attached figure 2 , 3 The polycondensation reactor:

[0086] The polycondensation reactor 104 is a horizontal propulsion reactor, including a housing 201, a motor 202, a stirring shaft 203, a feed port 204, a discharge port 205 and a vacuum port 206, and the feed port 204 is arranged at the front end of the housing 201 In the upper part, the discharge port 205 is arranged at the bottom rear end of the housing 201, the vacuum port 206 is arranged at the upper part of the side of the housing 201, the stirring shaft 203 runs through the housing 201, and one end of the stirring shaft 203 extending out of the housing 201 is connected to the motor 202 , there are at least three groups of helical blades 207 distributed on the stirring shaft 203 inside the housing 201, at least one set of scraper blades 208 fixed on the inner wall of the housing 201 is arranged between each two groups of helical blades 207, and the scraper blades 208 and The helical blades 207 e...

Embodiment 3

[0097] According to attached figure 2 , 3 The polycondensation reactor:

[0098] The polycondensation reactor 104 is a horizontal propulsion reactor, including a housing 201, a motor 202, a stirring shaft 203, a feed port 204, a discharge port 205 and a vacuum port 206, and the feed port 204 is arranged at the front end of the housing 201 In the upper part, the discharge port 205 is arranged at the bottom rear end of the housing 201, the vacuum port 206 is arranged at the upper part of the side of the housing 201, the stirring shaft 203 runs through the housing 201, and one end of the stirring shaft 203 extending out of the housing 201 is connected to the motor 202 , there are at least three groups of helical blades 207 distributed on the stirring shaft 203 inside the housing 201, at least one set of scraper blades 208 fixed on the inner wall of the housing 201 is arranged between each two groups of helical blades 207, and the scraper blades 208 and The helical blades 207 e...

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Abstract

The invention provides a process for continuous production of polycarbonate by a transesterification method, belonging to the field of chemical industry. In the process, a routine production method is improved, aromatic dihydroxy compound and aromatic carbonic acid diester are used as raw materials, and the polycarbonate product is prepared by transesterification reaction, polycondensation reaction and after polycondensation reaction, wherein a polycondensation reaction device is provided with three groups of helical blades which are distributed on a stirring shaft inside a shell, at least one group of scratching blades fixed on the inner wall of the shell are arranged between every two groups of helical blades, and the scratching blades are meshed with the helical blades. According to the invention, transesterification reaction and polycondensation reaction are continuously carried out in a high-temperature and high-vacuum system, and polycarbonate with high molecular weight is prepared; and the process parameters are improved and optimized and equipment provided by the invention is matched, thus an optimal effect is achieved.

Description

technical field [0001] The invention relates to a process for producing polycarbonate by transesterification, in particular to a process for continuously producing polycarbonate by transesterification, which belongs to the field of chemical industry. Background technique [0002] At present, the industrial production methods of polycarbonate in the world include phosgenation and transesterification. The phosgenation is the interfacial polycondensation of dihydroxy compounds and phosgene. ) polycondensation. [0003] A representative example of the transesterification method includes: reacting dihydric phenol and carbonic acid diester with a special catalyst at a certain temperature and pressure (vacuum), distilling off the formed monohydric phenol to form a prepolymer; The resulting prepolymer is heated to a temperature of 290°C or higher while distilling off the formed monohydric phenol to obtain a high molecular weight polycarbonate. [0004] The bulk polymerization meth...

Claims

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Application Information

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IPC IPC(8): C08G64/30
Inventor 周楠杨晓勇沈佶蔡盛全宋升徐亭原华张昕
Owner CHINA BLUESTAR CHENGRAND CO LTD
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