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A continuous phenol extraction system, a polycarbonate resin production system including the same, and a production method

A polycarbonate resin and production system technology, applied in separation methods, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of not working well, increasing equipment investment, reducing equipment use efficiency, etc., and reducing cleaning The use of chemical agents, the effect of reducing heat transfer efficiency and improving production efficiency

Active Publication Date: 2021-02-02
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vacuum degree of the system in the esterification stage is relatively low, and the recovered phenol is generally continuously extracted through a conventional negative pressure pump, but the vacuum degree in the polycondensation stage is much higher, and the conventional negative pressure pump cannot work well
Phenol will solidify at 42°C, the selected pumps and pipelines need heat tracing, which is difficult for conventional negative pressure pumps
In the industry, two storage tanks are used alternately to switch from vacuum extraction to normal pressure extraction, but the equipment investment increases, the control is more complicated, and the sealing degree and vacuum degree in the reactor cannot be guaranteed during continuous extraction.
[0005] At the same time, because polycarbonate is easy to have an adhesion effect with metal, and its own viscosity is high, the material stays in the pipeline for a long time, which is easy to cause local degradation in the pipeline, and dead angle areas appear, resulting in long-term blockage in the pipeline and reducing the efficiency of equipment.

Method used

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  • A continuous phenol extraction system, a polycarbonate resin production system including the same, and a production method
  • A continuous phenol extraction system, a polycarbonate resin production system including the same, and a production method
  • A continuous phenol extraction system, a polycarbonate resin production system including the same, and a production method

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Experimental program
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Effect test

Embodiment 1

[0113] This embodiment provides a phenol continuous extraction system 300, the phenol continuous extraction system 300 is as follows figure 1 Shown includes a gas-liquid separation unit 310 and a phenol collection unit 320 in communication.

[0114] The specific structure of the gas-liquid separation device 310 is as follows: figure 2 As shown, it includes a separation device housing, the housing is provided with a feed port 312, an exhaust port 313 and a liquid discharge port 314, the liquid discharge port 314 is connected to the liquid discharge pipeline 315, and the cleaning liquid is filled in the phenol collection device 320. The outlet end of the liquid discharge pipeline 315 extends below the liquid level of the cleaning liquid, and the exhaust port 313 is externally connected with a vacuum device. A separation chamber 316 is formed inside the housing of the separation device. The diameter of the separation chamber 316 is larger than the diameter of the feed port 312 ...

Embodiment 2

[0119] The difference between this embodiment and Embodiment 1 is that the ratio of the cavity diameter of the gas-liquid separation chamber 316 to the caliber of the feed port 312 is 30:1, and other structures, positional relationships and connection methods of the device system are the same as in Embodiment 1. .

Embodiment 3

[0121] The difference between this embodiment and Embodiment 1 is that the ratio of the cavity diameter of the gas-liquid separation chamber 316 to the caliber of the feed port 312 is 50:1, and other structures, positional relationships and connection methods of the device system are the same as in Embodiment 1. .

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Abstract

The invention provides a continuous phenol extraction system, a polycarbonate resin production system including the same and a production method. The phenol continuous extraction device includes a connected gas-liquid separation device and a phenol collection device. The gas-liquid The separation device is used to adjust the flow rate of the gas-liquid mixture entering the gas-liquid separation device, and at least one baffle is longitudinally arranged in the phenol collection device. The continuous phenol extraction system provided by the invention can ensure the vacuum degree and tightness inside the polycarbonate resin production system, realize continuous extraction of by-product phenol, and effectively recycle the extracted phenol.

Description

technical field [0001] The invention belongs to the field of polycarbonate production, and relates to a continuous phenol extraction system, a polycarbonate resin production system including the same and a production method, in particular to a continuous phenol extraction system using gas-liquid separation, and a polycarbonate resin production system including the same. Carbonate resin production system and production method. Background technique [0002] Polycarbonate by transesterification method, also known as polycarbonate by melt method, uses diol compounds such as bisphenol A and isosorbide to melt polycondensate with diphenyl carbonate to carry out transesterification, and continuously discharges phenol under high temperature and reduced pressure conditions to improve Reactivity and molecular weight. The reaction raw material purity requirement is higher, the reaction speed is slower, the reactor structure is more complex, and requires a high airtightness. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D5/00B01D53/26B01D21/00C07C37/70C07C39/04C08G64/30
CPCB01D5/009B01D21/0042B01D21/0045B01D53/265C07C37/70C08G64/307C07C39/04
Inventor 徐菲张锁江杨子锋赵秋张振才周志茂张军平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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