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Process for preparing polycarbonate

A technology of polycarbonate and impingement flow reactor, which is applied in the field of preparing polycarbonate by interface phosgene method, can solve the problems of low mixing efficiency and dissipation, and can strengthen the dispersion and transfer process, improve the reaction efficiency and molecular weight distribution. narrow effect

Active Publication Date: 2010-11-03
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, this process is due to the dissipation of part of the energy input to overcome the internal frictional resistance of the static mixer filled with various mixing elements; and when the mixed liquid passes through the static mixing elements, the liquid-liquid phase interface required for the reaction is Gradually increasing, in fact, the mixing efficiency at the beginning is not high
However, there is no report on the application of impinging flow reactors to the preparation of polycarbonate

Method used

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  • Process for preparing polycarbonate
  • Process for preparing polycarbonate
  • Process for preparing polycarbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Add 206.6g of bisphenol A, 2925g of water and 146g of 50% by mass sodium hydroxide solution into premix tank A to form an aqueous phase, and in premix tank B, mix 84g of liquid phosgene with 2095g of dichloromethane to form an organic phase , the water phase and organic phase materials are respectively input into the feed pipe of the nozzle-type impact flow reactor through the pump, so that the material is sprayed through the nozzle into the central area of ​​the impact zone at a high speed, and the speed of the material entering the entrance of the impact zone is 1.7 m / s , with a residence time of 24 seconds in the impinging flow reactor. Then the reaction solution enters the reactor E, and 2.19g of phenol and 1.85g of 50% by mass sodium hydroxide aqueous solution are added to make the solution pH value 11.5. After reacting for 45 minutes, 1.03g of triethylamine and 50% by mass of sodium hydroxide aqueous solution are added, The pH of the solution was brought to 11.5 a...

Embodiment 2

[0042] Add 206.6g of bisphenol A, 2925g of water and 146g of 50% by mass sodium hydroxide solution in the premixing tank A and mix to form an aqueous phase. In the premixing tank B, 83g of liquid phosgene and 2000g of dichloromethane are mixed to form an organic phase. The water phase and organic phase materials are respectively input into the feed pipe of the nozzle-type impingement flow reactor through the pump. Under the action of pressure, the materials are injected into the center of the impact zone through the nozzle at high speed, and the material enters the impact zone at an inlet speed of 3.8 m / s. , with a residence time of 5 seconds in the impactor reactor. After the reaction, the reaction solution enters the intermediate tank C, adds 2.19g of phenol and 1.85g of 50% by mass sodium hydroxide solution to make the pH value of the solution 11.5, and enters into the feed pipe of another nozzle-type impingement flow reactor by a pump respectively, The velocity of the mate...

Embodiment 3

[0044] Add 207.4g of bisphenol A, 2925g of water and 146g of 50% by mass sodium hydroxide solution into the premixing tank A to form an aqueous phase, and in the premixing tank B, mix 84g of liquid phosgene and 2095g of dichloromethane to form an organic phase , the water phase and organic phase materials are respectively input into the feed pipe of the nozzle-type impact flow reactor through the pump, and the material is injected into the center of the impact area through the nozzle at a high speed under the pressure, and the material enters the impact area at an inlet speed of 2.1 m / seconds, with a residence time of 20 seconds in the impact reactor. Then the reaction solution enters the intermediate tank C, adds 1.46g phenol and 1.85g50 mass% sodium hydroxide solution, makes the solution pH value 11.8, and enters respectively in the feed pipe of another nozzle type impinging flow reactor by a pump, the material The inlet velocity into the impact zone is 3.2 m / s, and the res...

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Abstract

The invention provides a method for preparing polycarbonate via impinging stream reactor and interface method, comprising: (a) mixing bisphenol compound and alkali metal hydroxide water solution into aqueous phase, dissolving carbonyl chloride in an inertia solvent of polycarbonate to form organic phase, (b) feeding the aqueous phase and organic phase into an impinging stream reactor to process photochemical reaction, (c) after the impinging stream reactor, carrying out sealing reaction and coupling reaction, separating to obtain polycarbonate. The invention can improve the reaction efficiency of carbonyl chloride and phenolate, to react completely, shorten the interface photochemical reaction and the whole condensation, reduce side product and reduce energy consumption.

Description

technical field [0001] The invention relates to a method for preparing polycarbonate by an interface phosgene method, in particular to a method for preparing polycarbonate by adopting an impingement flow reactor to strengthen interface phosgenation reaction. Background technique [0002] Polycarbonate resin has excellent comprehensive properties, especially its optical properties, mechanical properties, impact resistance, heat resistance and electrical properties. As an engineering plastic, it is widely used in electrical, electronic, automotive, home appliances, construction and other applications. [0003] There are two main methods for the industrial production of polycarbonate, namely the interfacial phosgene method and the melt transesterification method. The method of interfacial phosgene production of polycarbonates is known from, for example, "Chemistry and Physics of polycarbonates", Polymer Reviews, H. Schnell, Vol. 9, John Wiley & Sons, Inc. (1964), pp. 50-51 and...

Claims

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Application Information

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IPC IPC(8): C08G64/24
Inventor 黄岐善陈斌华卫琦姚雨白年平丁建生
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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