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Method and system for adjusting temperature in polymerizer and application of method and system

A technology for regulating polymerization and internal temperature, applied in chemical instruments and methods, chemical/physical/physical-chemical stationary reactors, chemical/physical/physical-chemical processes, etc. Explosion risk and other problems, to achieve the effect of stable temperature, good product performance and good repeatability

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It can be seen from the existing published patents that for the process of acrylonitrile polymerization to prepare polyacrylonitrile, the patent reports mainly focus on the polymerization process, and there is little information on how to adjust the temperature control water in the polymerization tank to achieve precise control of the polymerization temperature. Reported, and the reported patent adopts the control method of controlling the temperature of the temperature-controlled water temperature by the temperature of the polymerization kettle, which has a serious hysteresis of temperature regulation, which can easily lead to excessively high polymerization reaction temperature, causing temperature control failure and the risk of implosion

Method used

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  • Method and system for adjusting temperature in polymerizer and application of method and system

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Comparison scheme
Effect test

Embodiment 1

[0096] After resetting the instruments, each reaction material is added to the polymerization kettle 1 one by one, and the initiator is finally added to the polymerization kettle; the temperature regulating valve TV1 and the temperature regulating valve TV2 are opened according to the set opening degree through the temperature control module 7, so that the polymerization kettle The temperature of the internal material is stabilized to the first set temperature (specified initial temperature T1); the temperature control valve TV1 is adjusted according to the set opening degree through the temperature control module 7, the flow control valve FV3 is opened, and the polymerization kettle 1 is turned on within the set time n The temperature in the kettle rises steadily to the second set temperature (designated temperature T2); the opening degree of the temperature regulating valve TV2 is adjusted by the temperature control module 7 so that the temperature of the material in the kettl...

Embodiment 2

[0103] In this embodiment, the set value of the temperature regulating valve TV1 is 35m 3 / h and temperature regulating valve TV2 set value is 10m 3 / h, the setting value of regulating valve FV3 is 25m 3 / h; the temperature of the normal temperature water stream F1 and the normal temperature water stream F2 is 30°C, and the temperature of the hot water stream F3 is 80°C. The heating process curve adopts a uniform heating curve.

[0104] The specified initial temperature T1 = 30°C, the initial opening of the TV1 valve is 90%, and the flow rate is 31.5m 3 / h; The initial opening of the TV2 valve is 40%, and the flow rate is 4m 3 / h; the initial opening of FV3 valve is 0%, and the flow rate is 0m 3 / h.

[0105] The specified temperature T2=59℃, the opening of TV1 valve is gradually adjusted from 80% to 20%, and the flow rate is changed from 31.5m 3 / h is gradually adjusted to 7m 3 / h; TV2 valve opening remains unchanged at 40%, and the flow rate is 4m 3 / h; FV3 valve open...

Embodiment 3

[0109] In this embodiment, the set value of the temperature regulating valve TV1 is 30m 3 / h and temperature regulating valve TV2 set value is 10m 3 / h, the setting value of regulating valve FV3 is 40m 3 / h; the temperature of the normal temperature water flow F1 and the normal temperature water flow F2 is 25°C, and the temperature of the hot water flow F3 is 80°C. The heating process curve adopts a uniform heating curve.

[0110] The specified initial temperature T1 = 25°C, the initial opening of the TV1 valve is 70%, and the flow rate is 21m 3 / h; the initial opening of TV2 valve is 60%, and the flow rate is 6m 3 / h; the initial opening of FV3 valve is 0%, and the flow rate is 0m 3 / h.

[0111] The designated temperature T2=59℃, the opening of TV1 valve is gradually adjusted from 70% to 20%, and the flow rate is changed from 21m 3 / h is gradually adjusted to 6m 3 / h; TV2 valve opening remains unchanged at 60%, and the flow rate is 6m 3 / h; FV3 valve opening gradually...

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Abstract

The invention discloses a method and system for adjusting the temperature in a polymerization kettle, and the method comprises the following steps: introducing a normal-temperature water flow F1, a normal-temperature water flow F2 and a hot water flow F3 as polymerization kettle temperature control water to adjust the temperature in the kettle, and firstly, reaching the initial temperature through the normal-temperature water flow F1 and / or the normal-temperature water flow F2; the temperature is increased by adjusting the flow of the normal-temperature water flow F1, the flow of the hot water flow F3 and the flow of the optional normal-temperature water flow 2, and the temperature is maintained by adjusting the flow of the normal-temperature water flow F2. The method and the system can be used in the acrylonitrile polymerization production process, and have the advantages of sensitive temperature control, stable temperature control in the polymerization reaction process of each batch, stable acrylonitrile conversion rate, stable molecular weight distribution index of the polyacrylonitrile product, good repeatability in the reaction process and good product performance.

Description

technical field [0001] The invention relates to the temperature control of a polymerization kettle, in particular to a method and system for adjusting the temperature in a polymerization kettle and its application, in particular to an acrylonitrile polymerization kettle. Background technique [0002] Carbon fiber is a reinforced and functional new fiber material with high specific strength and high specific modulus. It is a high-tech product developed rapidly in the 1960s. It has a series of comprehensive functions such as low density, heat resistance, chemical corrosion resistance, friction resistance, thermal shock resistance, electrical conductivity, heat conduction, radiation resistance, good damping, shock absorption, and noise reduction. As a fiber, it also has softness and It can be woven and woven, and it is particularly prominent in its two characteristics of high specific strength and high specific modulus. The specific modulus of the resin-based composite materia...

Claims

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Application Information

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IPC IPC(8): B01J19/00B01J19/18C08F20/44C08F2/01
CPCB01J19/0013B01J19/0066B01J19/0053B01J19/18C08F20/44C08F2/01B01J2219/00094
Inventor 胡帅毕丰雷
Owner CHINA PETROLEUM & CHEM CORP