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Preparation method of polyisobutene with low molecular weight and high activity

A polyisobutene and high activity technology is applied in the field of preparation of low-molecular and high-activity polyisobutene, which can solve the problems of difficult control of polyisobutene molecular weight, reduced polymerization selectivity, uneven concentration diffusion, etc., and achieves good product quality stability, High conversion rate, easy control of activity and stable effect

Active Publication Date: 2012-07-25
SHANDONG HONGRUI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas-phase boron trifluoride and liquid-phase complexing agent added to the reaction system can only form catalysts after diffusion reaction. Because their concentration in the reaction system is not uniformly diffused, it is easy to form a local catalyst concentration that is too high, resulting in a polymerization reaction. The selectivity is reduced, and the molecular weight of polyisobutylene is not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1. The polymerized monomer adopts concentrated mixed C4 after catalytic cracking from an oil refinery, with an isobutylene content of 90% and a diene content of less than 0.05%. The mixed C4 is continuously fed into a 40L polymerization reactor with stirring at a speed of 500L / h The speed of the agitator is 150~200r / min; the catalyst A is continuously added at the inlet of the polymerization reactor at a rate of 150ml / h, and the catalyst B is continuously added at the other inlet of the polymerization reactor at a rate of 100ml / h, and then at -20 The polymerization reaction is carried out at ~30°C and 0.6~1.5Mpa for 15~18 minutes. Catalyst A is boron trifluoride isopropanol complex, the molar ratio of boron trifluoride to isopropanol is 0.5:1, catalyst B is the same boron trifluoride isopropanol complex, boron trifluoride and isopropanol The molar ratio of propanol is 0.1:1.

[0024] The polymer material is continuously extracted from the outlet of the polymerizat...

Embodiment 2

[0025] Example 2. The same polymerization device as in Example 1. The catalyst adopts a single catalyst A, which is added from the inlet of the polymerization device, the addition amount remains unchanged, the polymerization conditions and polymer post-processing methods remain unchanged, and the raw materials are concentrated from the catalytic cracking of the refinery. Mixed with C4, 90% isobutylene content, and diene content ≤0.05%. The number average molecular weight of the products obtained in the examples is 1200-1350, the molecular weight distribution is ≤2.0, the average conversion rate is 80%, and the α-terminal double bond content is 60%.

Embodiment 3

[0026] Example 3, the same polymerization device as in Example 1, the A+B mixed catalyst was continuously added at the inlet of the polymerization reactor at a rate of 250ml / h, the polymerization conditions and polymer post-treatment methods were unchanged, and the raw materials were from the refinery catalytic cracking Concentrated mixed C4, isobutylene content 78%, diene content ≤ 0.05%. The number average molecular weight of the products obtained in the examples is 1250-1350, the molecular weight distribution is ≤2.0, the average conversion rate is 80%, and the α-terminal double bond content is 70%.

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Abstract

The invention discloses a preparation method of polyisobutene with low molecular weight and high activity. The method comprises the following steps of: continuously adding a raw material with isobutylene content of 40-90wt% into a polymer reactor, and simultaneously adding a catalyst A and a catalyst B from the two inlets of the polymer reactor to perform polymerization reaction; terminating the obtained polymer material by a terminator; performing tertiary countercurrent washing and then removing the unreacted C4 component by a climbing-film evaporator; further removing the unreacted C4 component in a falling-film evaporator; and finally removing low polymer through vacuum distillation to obtain high-activity polyisobutene with number-average molecular weight of 500-5,000, wherein the content of alpha-terminal double bonds is greater than or equal to 80% by mole, the maximum isobutylene conversion rate can reach 85%, and the molecular weight distribution is narrow. The method disclosed by the invention is simple and reasonable in polymerization technology; and due to the mode of continuously adding catalysts at different positions, the reaction conditions are relatively mild, the polymerization occurrence possibility is low, the reaction conditions are easy to control, and the quality stability is good.

Description

Technical field [0001] The invention relates to a method for preparing polymers, in particular to a method for preparing low-molecular high-activity polyisobutylene. Background technique [0002] The number average molecular weight of low-molecular-weight polyisobutylene is generally 500-5000, while ordinary low-molecular-weight polyisobutylene has a molecular chain terminal double bond (α-terminal double bond) with a molar content of about 10%. The molar content of α-terminal double bonds is above 70%, even as high as 80%. [0003] Low-molecular-weight and high-activity polyisobutylene is mainly used to synthesize ashless detergent dispersants. This ashless dispersant is used in lubricating oil and fuel oil to prevent carbon deposits, improve oil performance, and benefit the engine's efficiency and environmental protection. In the process of synthesizing this type of additives, ordinary low-molecular-weight polyisobutylene has very low reactivity due to its low terminal double bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/10C08F110/10C08F4/14
Inventor 张毅鸿杨明哲孔庆苓
Owner SHANDONG HONGRUI NEW MATERIAL TECH
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