Preparation method of polyisobutene with low molecular weight and high activity

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

Active Publication Date: 2013-11-06
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] Embodiment 1, the polymerized monomer adopts the concentrated mixed C4 from the catalytic cracking of the refinery, the isobutylene content is 90%, and the diene content is less than 0.05%, and the mixed C4 is continuously added at a speed of 500L / h by a 40L polymerization reactor with stirring , the speed of the stirrer is 150-200r / min; the catalyst A is continuously added at the speed of 150ml / h at the entrance of the polymerization reactor, and the catalyst B is continuously added at the speed of 100ml / h at the other entrance of the polymerization reactor, 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, and catalyst B is both boron trifluoride isopropanol complex, boron trifluoride and isopropanol Propanol molar ratio is 0.1:1.

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

Embodiment 2

[0025] Embodiment 2, the same polymerization device as in Example 1, the catalyst adopts a single catalyst A, which is added by the import of the polymerization device, the addition is constant, the polymerization conditions and the polymer post-treatment method are constant, and the raw material adopts the enrichment from the catalytic cracking of the refinery Mixed C4, isobutene content 90%, diene content ≤ 0.05%. The number-average molecular weight of the product obtained in the embodiment 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] Embodiment 3, the same as the polymerization device of embodiment 1, add A+B mixed catalyst continuously at the speed of 250ml / h at the entrance of the polymerization reactor, the polymerization conditions and the post-treatment mode of the polymer are unchanged, and the raw material adopts catalytic cracking from the refinery Concentrated mixed C4, isobutene content 78%, diene content ≤ 0.05%. The number average molecular weight of the product obtained in the embodiment 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 a polymer, in particular to a method for preparing low molecular weight and high activity polyisobutylene. Background technique [0002] The number-average molecular weight of low-molecular-weight polyisobutene is generally 500-5000, and the molecular chain terminal double bond (α-terminal double bond) of ordinary low-molecular-weight polyisobutene is generally about 10% molar content, while low-molecular-weight high-activity polyisobutene is generally The α-terminal double bond molar content is above 70%, even as high as 80%. [0003] Low-molecular-weight high-activity polyisobutene is mainly used in the synthesis of ashless detergent and dispersant. This ashless dispersant is used in lubricating oil and fuel oil, which can prevent carbon deposition, improve the performance of oil products, benefit the efficiency of the engine and be environmentally friendly. In the process of synthesizing such additive...

Claims

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Application Information

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Patent Type & Authority Patents(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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