Process and apparatus for continuously producing aromatic polycarbonate

A technology of polycarbonate and manufacturing methods, applied in chemical instruments and methods, chemical/physical/physical chemical processes, chemical/physical/physical chemical fixed reactors, etc., can solve problems such as switching losses and reduce quality degradation , the effect of reducing the switching loss

Active Publication Date: 2009-06-03
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in the case of producing aromatic polycarbonate by the above-mentioned melting method, it is usually produced by using a production device in which two or more reactors are connected in series under reduced pressure, so if the molar ratio of the starting materials is changed and other reaction conditions, a changeover loss (changeover loss) will occur before the target aromatic polycarbonate is obtained

Method used

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  • Process and apparatus for continuously producing aromatic polycarbonate
  • Process and apparatus for continuously producing aromatic polycarbonate
  • Process and apparatus for continuously producing aromatic polycarbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0162] As shown in FIG. 1 , an aromatic polycarbonate was produced by an aromatic polycarbonate production apparatus having two series of polycondensation steps as follows.

[0163] (preparation of raw material solution)

[0164] The DPC melt prepared at 120°C under a nitrogen atmosphere and the BPA powder measured under a nitrogen atmosphere were supplied to the first raw material mixing tank 2a through the DPC supply port 1a-1 and the BPA supply port 1b, respectively. Utilize the micro-motion flowmeter and the weight feeder of weight loss compensation method to measure, so that the supply rate of DPC is 87.7 kg / hour, and the supply rate of BPA is 89.8 kg / hour (DPC / BPA molar ratio is 1.040). The first raw material mixing tank 2a is set at 140°C under normal pressure nitrogen atmosphere, and the inner volume of the first raw material mixing tank 2a is 0.4m 3, and it is equipped with an anchor type stirring impeller 3a. At this time, the transesterification catalyst does not ...

Embodiment 2

[0252] An example of producing an aromatic polycarbonate through two or more series of polycondensation steps after the raw material preparation step by additionally adding diester carbonate filtered through a filter will be described.

[0253] Fig. 4 is a diagram showing an example of an aromatic polycarbonate production apparatus in which a diester carbonate filtered through a filter is supplemented after the raw material preparation process. The specifications of each machine are the same as those of the raw material preparation process, the first series and the second series in the aromatic polycarbonate production apparatus used in Example 1, and the same symbols are used.

[0254] As shown in Fig. 4, the DPC melt prepared at 120°C under a nitrogen atmosphere was passed through a SUS316L filter 1f with an absolute filtration accuracy of 0.5 μm, and then passed through the DPC supply port 1a provided in the middle of the transfer pipe for the raw material mixture. -2 Feed ...

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PUM

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Abstract

The present invention provides a process and apparatus for continuously producing aromatic polycarbonate. A process by which two or more grades of aromatic polycarbonates are produced by the melting method without causing a switching loss or quality deterioration. The process for aromatic polycarbonate production comprises: feeding a molten mixture of raw materials comprising an aromatic dihydroxy compound and / or carbonic diester produced in the absence of a transesterification catalyst to two series of polycondensation steps, each series comprising three vertical reactors and one horizontal reactor which have been serially connected; and continuously and simultaneously conducting polycondensation in the presence of a transesterification catalyst.

Description

technical field [0001] The present invention relates to a continuous production method and the like of an aromatic polycarbonate. More specifically, the present invention relates to a continuous production method and the like of an aromatic polycarbonate having two or more series of polycondensation steps. Background technique [0002] Aromatic polycarbonates have excellent mechanical properties such as impact resistance, heat resistance, transparency, etc., and are widely used in various mechanical parts, optical disks, automobile parts, and the like. [0003] As a method for producing such an aromatic polycarbonate, a method of directly reacting bisphenols such as bisphenol A with phosgene (interface method), transesterification of bisphenols such as bisphenol A and diphenyl carbonate, etc. A method (melt method) for polycondensation of diester carbonates is known. Among them, compared with the interfacial method, the melting method utilizing the transesterification react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
CPCB01J19/20B01J19/1856C08G64/307B01J2219/00083B01J2219/00094C08G64/205B01J19/1862B01J19/00C08G64/20C08G64/30
Inventor 内村竜次滨野俊之高桥和幸宫本正昭
Owner MITSUBISHI RAYON CO LTD
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