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Method and automatic control system for producing polyisobutylene by continuous polymerization

An automatic control system and polyisobutylene technology, applied in the field of continuous polymerization of isobutene to produce polyisobutene, and continuous polymerization to produce polyisobutene, can solve problems such as unfavorable production stability, changes in production line process conditions, and production efficiency decline, and achieve convenient and efficient production process control. Accurate, avoid vaporization loss, more controllable pressure effect

Active Publication Date: 2016-06-15
SHANDONG HONGRUI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the invention patent of CN1412210A, the inventor provides a preparation method of low molecular weight and high activity polyisobutylene, wherein the residence time of the material in the kettle is 20 minutes to 5 hours, the pressure is 0.1-1MPa, and the tubular reaction is adopted Therefore, changing the reaction time can only be done by changing the feed and discharge flow rates, and the pressure cannot be automatically controlled
In the invention patent of CN101792502A, the inventor provides a polymerization method and device for medium molecular weight polyisobutylene. The feed port of the reactor is at the bottom, and the outlet is at the top. The reactor is full during production, so the reaction time is changed. Only by changing the feed and discharge flow of raw materials, the pressure cannot be automatically controlled due to the full operation of the kettle during the production process
The problem in the above invention is that when adjusting the reaction time, the flow rate of the production line materials must be adjusted, which will lead to changes in the process conditions of the entire production line, and easily cause fluctuations in product quality. The flow of materials will cause a decrease in production efficiency. Since the pressure cannot be controlled, it is not conducive to the safe and stable operation of production.
In this method, adjusting the catalyst flow rate or the flow rate of the C4 hydrocarbon feed mixture is likely to cause fluctuations in the entire production line process, which is not conducive to the stability of production. The inventor also explained that the total pressure is not constant, so this method cannot control the gas phase part of the reactor. The inventor does not provide the control method of the liquid level of the polymerization reactor

Method used

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  • Method and automatic control system for producing polyisobutylene by continuous polymerization

Examples

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Effect test

Embodiment 1

[0060] The method for producing polyisobutene by continuous polymerization and the automatic control system of the present invention are used to produce polyisobutene.

[0061] The raw material used comes from concentrated mixed C4 after catalytic cracking in an oil refinery, wherein the content of isobutene is 47% (weight ratio, the same below), the content of diolefins is less than 0.05%, and an aluminum trichloride system catalyst is used.

[0062] The flow rate of raw material mixed carbon four is 1840kg / h, along pipeline 4 raw material feeding pipelines, add continuously from the upper part of the reactor, the addition amount of aluminum trichloride in the corresponding catalyst is 0.50% of the isobutene addition in the raw material mixed carbon four, trichloro The flow rate of aluminum trichloride in the aluminum system catalyst is 4.32kg / h, which is continuously added from the upper part of the reactor along the catalyst feed pipe of pipeline 5, fully mixed under the act...

Embodiment 2

[0072] Repeat the method for producing polyisobutene by continuous polymerization described in Example 1 and the automatic control system to produce polyisobutene, the difference is that the liquid level setting value is 60%, and the residence time is 50min. The polyisobutene number average produced by this embodiment The molecular weight is 1295, the molecular weight distribution is 2.13, and the conversion rate of isobutylene is 96%.

Embodiment 3

[0074] Repeat the method for continuous polymerization described in Example 1 to produce polyisobutene and the automatic control system to produce polyisobutene, the difference is that the raw material is the mixture of pure isobutene and normal hexane obtained from MTBE catalytic cracking, and the mass proportion is 1:2, The amount of aluminum trichloride added in the catalyst is 0.15% of the amount of isobutylene added in the raw material, the flow rate of aluminum trichloride in the aluminum trichloride system catalyst is 0.92kg / h, the reaction temperature is -25°C, and the liquid level is 50% , the residence time is 42min, and the temperature of the condenser is -35°C. The polyisobutylene produced in this example has a viscosity-average molecular weight of 55,000, a molecular weight distribution of 2.87, and a conversion rate of isobutylene of 92%.

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Abstract

The invention discloses a method and an automatic control system for carrying out continuous polymerization production of polyisobutene and belongs to the field of production process control. The method comprises the following steps: continuously adding reaction raw materials and a catalyst into a reactor according to a specified proportion to carry out polymerization reaction, continuously discharging reaction products from the bottom of the reactor, wherein the automatic control system for carrying out continuous polymerization production of polyisobutene is used for automatically controlling the liquid level and the pressure of the reactor; presetting the liquid level and the set pressure value of the reactor according to the actual production, carrying out real-time measurement on the liquid level and the pressure of the reactor by virtue of the automatic control system, comparing measured values with preset values, calculating and outputting a control signal so as to control the liquid level and the pressure of the reactor within a control range of the set values to realize the continuous and automatic production of polyisobutene.

Description

technical field [0001] The invention relates to a method and an automatic control system for producing polyisobutene by continuous polymerization, belonging to the field of production process control, and in particular to a method for producing polyisobutene by continuous polymerization of isobutene and an automatic control system. Background technique [0002] At present, using pure isobutene, hydrocarbon mixture of isobutene or mixed C4 containing isobutene as raw material, using Lewis acid as catalyst, such as aluminum trichloride or boron trifluoride, cationic polymerization at a certain temperature for continuous production of polyisobutene technology It is well known that the molecular weight of polyisobutylene with practical value is several hundred to hundreds of thousands, or even more than one million. In the process of continuous production of polyisobutylene, parameters including reactor temperature, liquid level, pressure, etc. are important process parameters. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/10C08F2/00C08F2/01G05D27/02
CPCY02P20/10
Inventor 张毅鸿杨明哲宋毅光刘爱平李长振
Owner SHANDONG HONGRUI NEW MATERIAL TECH
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