Polymerization catalyst system and method for preparing highly reactive polyisobutylene

A technology for polymerization catalyst and polyisobutene, applied in the field of preparing high-reactivity polyisobutene, can solve problems such as expensive process

Active Publication Date: 2022-01-25
INDIAN OIL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are critical polymerization low temperature below -30°C and highly purified feedstock which makes the process more expensive

Method used

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  • Polymerization catalyst system and method for preparing highly reactive polyisobutylene
  • Polymerization catalyst system and method for preparing highly reactive polyisobutylene
  • Polymerization catalyst system and method for preparing highly reactive polyisobutylene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Polymerization was carried out at -10°C under a nitrogen atmosphere in a jacketed reactor equipped with a condenser. In a typical example of the experiment, 800 mL of hexane was placed in the reactor at 0°C. 200 mL of IB (4M) was condensed and added to the polymerization reactor containing hexane. Then, by adding 0.01M AlCl 3 Ether complexes (where [AlCl 3 ]=0.01M, [i-Pr 2 O]=0.005M and [Bu 2 O] = 0.005M) was added to the reactor at 0°C and polymerization started under stirring conditions. After a polymerization time of 1 hour, the polymerization was terminated by adding methanol. A polymerization yield of 98% was observed. The product has a Mn, NMR = 1500 Daltons and an exo-olefin content of 78%.

[0095] Polymerization yields were determined gravimetrically. The distribution and molecular weight (Mn, NMR) of the different olefin end groups were determined by 1HNMR.

Embodiment 2

[0097] Polymerization was carried out at -10°C under a nitrogen atmosphere in a jacketed reactor equipped with a condenser. In a typical example of the experiment, 800 mL of hexane was placed in the reactor at 0°C. 200 mL of IB (4M) was condensed and added to the polymerization reactor containing hexane. Then, by adding 0.01M prepared Lewis acid·i-Pr 2 O complexes (where [AlCl 3 ]=0.005M, [EADC]=0.005M and [i-Pr 2 O] = 0.01M) was added to the reactor at 0°C and polymerization started under stirring conditions. After a polymerization time of 1 hour, the polymerization was terminated by adding NaOH solution. A polymerization yield of 98% was observed. The product has a Mn, NMR = 1500 Daltons and an exo-olefin content of 80%.

[0098] Table 1: Polymerization of IB using [Lewis acid · Lewis base] = 0.005 to 0.01 M in dry hexane at 0°C, where [Lewis acid] / [Lewis base] = 0.5 to 1.0

[0099]

[0100] a Determined by gravimetric analysis based on [IB] (Macromolecules, 201...

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Abstract

The present invention provides a method for preparing highly reactive polyisobutylene by liquid phase polymerization of isobutylene or a feedstock containing isobutylene, wherein at least 70 mol% of the polymer chains in the polyisobutylene have external olefin end groups. Further, the present invention provides a catalyst composition for polymerization, the catalyst composition comprising a Lewis acid complexed with at least two Lewis bases selected from the group consisting of sterically hindered ethers and linear dialkyl ethers; or the catalyst composition comprises a Lewis base complexed with at least two Lewis acids selected from aluminum halide mixtures. The present invention also provides that a catalyst comprising a mixture of a Lewis acid and a Lewis base or a mixture of a Lewis base and a Lewis acid shows a synergistic effect, thereby obtaining a high yield of polyisobutene with high isobutene conversion and high external olefin content, and maintaining a desired molecular weight range of 250 Daltons to 10000 Daltons.

Description

technical field [0001] The present invention relates to a polymerization catalyst system for the liquid phase polymerization of isobutene or isobutene-containing feedstocks for the preparation of polyisobutenes in which at least 70 mol % of the polymer chains in the polyisobutene have external olefin end groups. Furthermore, the invention relates to a process for the preparation of highly reactive polyisobutenes by liquid phase polymerization. Background technique [0002] Catalyst systems for the cationic polymerization of isobutylene (IB) or feedstocks containing IB (e.g., raffinate 1) are of high commercial value, and these catalyst systems produce highly reactive polyisobutylene (highly reactive polyisobutylene, HR PIB) having a Mn (number average molecular weight) in the range of 500 Daltons to 5000 Daltons and specifically at least 70 mole % reactive vinylidene groups at the ends. The primary use of HR PIBs discussed herein is as a precursor material for the preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/10C08F110/10C08F4/14C08F4/52
CPCC08F10/10C08F110/10C08F4/14C08F4/52C08F2/06C08F2500/02C08F2500/29C08F210/10C08F4/022C08F2/01C08F2/38
Inventor 拉贾塞卡·托塔古尔米特·辛格拉什米·拉尼苏吉特·蒙代尔古普雷特·辛格·卡普尔桑卡拉·斯里·文卡塔·拉玛库玛
Owner INDIAN OIL CORPORATION
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