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Final polycondensation reactor for preparing polycarbonate(PC)

A technology of polycarbonate and final polycondensation, which is applied in the field of polycarbonate, can solve the problems of unstable vacuum degree, difficult control of material residence time, and easy occurrence of side reactions, so as to prevent overheating side reactions, improve reaction effects, and prevent side effects. The effect of the reaction

Active Publication Date: 2019-09-27
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

[0007] The invention provides a final polycondensation reactor for preparing polycarbonate, which solves the problems that the material residence time is not easy to control, side reactions are easy to occur, and the vacuum degree is unstable in the existing polycarbonate final polycondensation process

Method used

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  • Final polycondensation reactor for preparing polycarbonate(PC)
  • Final polycondensation reactor for preparing polycarbonate(PC)
  • Final polycondensation reactor for preparing polycarbonate(PC)

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a final polycondensation reactor for preparing polycarbonate includes a horizontal cylindrical shell 1, a feed port 3, a discharge port 4 and a vacuum port 5, and the horizontal cylindrical shell 1 is provided with a drive shaft 2. A low-viscosity zone 10, a medium-viscosity zone 11 and a high-viscosity zone 12 are arranged in the horizontal cylinder 1 from the feed port 3 to the discharge port 4, and the drive shaft 2 is equipped with a disc paddle 6 , net-frame paddle 8 and screw ring-type paddle 9, described disc paddle 6 is positioned at low-viscosity zone 10, is provided with dividing plate 7 between disc paddle 6, enhances mass transfer; Net-frame paddle The blade 8 is located in the medium-viscosity zone 11 , and the spiral ribbon ring paddle 9 is located in the high-viscosity zone 12 .

[0033] The radial section of the horizontal cylinder 1 can be circular or approximately elliptical. When the section is circular, the drive shaft 2 i...

Embodiment 2

[0041] Such as Figure 4As shown, a final polycondensation reactor for preparing polycarbonate, the horizontal cylindrical barrel 1 is also provided with a vacuum sealing device, the vacuum sealing device is arranged at the vacuum port 5, including the horizontal cylindrical barrel 1 The fixed seat I1-1 on the outer wall and the fixed seat II1-2 on the inner wall, the fixed seat I1-1 is provided with a vacuum elbow 1-3, the vacuum elbow 1-3 is set through the vacuum port 5, and the vacuum elbow A vacuum sealing head 1-4 is provided outside the tube 1-3, a support cover 1-5 is provided outside the vacuum sealing head 1-4, a vent hole 1-6 is provided on the support cover 1-5, and a vent hole 1-6 is provided on the vent hole 1-6. There are vacuum hoods 1-7.

[0042] The fixing seat I1-1 of the present invention is placed outside the horizontal cylinder body 1, the fixing seat II1-2 and the vacuum sealing head 1-4 are placed inside the horizontal cylinder body 1, and the elbow mo...

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Abstract

The invention provides a final polycondensation reactor for preparing polycarbonate. The reactor includes a horizontal cylindrical body, a feeding port, a discharging port and a vacuum port; a driving shaft is arranged inside the horizontal cylindrical body, a feeding port, a discharging port and a vacuum port, a low viscosity area, a medium viscosity area and a high viscosity area are arranged inside the horizontal cylindrical body from the feeding port to the discharging port in sequence, disc blades, screen frame blades and spiral belt ring blades are installed on the driving shaft, the disc blades are lower than the low viscosity area, the screen frame blades are located in the medium viscosity area, and the spiral belt ring blades are located in the high viscosity area. According to the final polycondensation reactor for preparing polycarbonate, by arranging different types of blades, the reactor adapts to the change of material properties of different areas, which is beneficial to improving the reaction effect; the spiral belt ring blades of the high viscosity area can change the stay time of high viscosity PC, side effects are prevented, and the product quality is improved. The novel reactor is provided with the combined blades, an axial membrane and a radial membrane with a certain angle can be formed, certain driving force can be applied to the high viscosity PC at the end of the cylindrical body, the stay time can be effectively controlled, and a superheated side reaction is prevented.

Description

technical field [0001] The invention relates to the field of polycarbonate, in particular to a final polycondensation reactor for preparing polycarbonate. Background technique [0002] Transesterification polycarbonate, also known as melt polycarbonate, uses bisphenol and diphenyl carbonate to melt and polycondense for transesterification, and continuously discharges phenol under high temperature and reduced pressure conditions to increase the degree of reaction 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] The preparation process of transesterification polycarbonate includes esterification process and polycondensation process. In the current published related patents, the final polycondensation reactor is mostly a horizontal disc reactor with high liquid holding capacity. The structure includes horizontal cylinder, cylinder The bod...

Claims

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Application Information

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IPC IPC(8): B01J19/20C08G64/30C08G64/20
CPCB01J19/20C08G64/205C08G64/307
Inventor 徐菲何宏艳张振才张延强方文娟张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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