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Polyisobutylene prepared with low diluent content reaction medium

A technology for polyisobutylene, diluent components, used in chemical instruments and methods, chemical/physical processes, chemical recycling, etc.

Active Publication Date: 2014-09-24
TPC GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Prior art systems are characterized by diluent levels in the reaction mixture of 10% by weight or more, typically 50% by weight diluent or more, require solvent recovery and / or involve high solvent costs

Method used

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  • Polyisobutylene prepared with low diluent content reaction medium
  • Polyisobutylene prepared with low diluent content reaction medium
  • Polyisobutylene prepared with low diluent content reaction medium

Examples

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Embodiment

[0066] exist image 3 The operation of the process of the invention using a double pass loop reactor is illustrated and described in . exist image 3 A reactor system 10 is schematically shown in , comprising a double pass loop reactor 12, a circulation pump 14 driven by a motor 16 with a variable speed drive 18, a feed and circulation loop indicated at 20 and a Products are exported.

[0067] The reactor 12 includes a feed chamber 24 , a plurality of tubes for upward flow indicated at 26 , a plurality of tubes for downward flow indicated at 28 , and an upper plenum 30 and a receiving chamber 32 for the recycle material. Reactor 12 is of conventional design and known in the art as a 1-2 shell and tube heat exchanger (1 shell, 2 tube passes). The reactor is suitably fitted with 1164 tubes with an outer diameter of 0.375" and a wall thickness of 0.035". The tubes are surrounded by shells indicated at 34, 36 and are used to circulate the chilled cooling liquid since the polym...

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Abstract

A method of making a polyisobutylene polymer in a recirculating loop reactor with one or more reaction tubes in contact with a heat transfer medium includes: (a) providing a feed mixture consisting essentially of polymerizable monomer and catalyst to a residual reactor stream at a feed rate to form a reaction mixture, the reaction mixture containing less than 5% by weight diluent components; (b) recirculating the reaction mixture in the one or more reaction tubes of the loop reactor at a recirculation rate greater than the feed rate utilizing a recirculating pump operating at a pressure differential, delta P, corresponding to a recirculating flow; (c) polymerizing the reaction mixture in the one or more tubes of the loop reactor to convert the feed mixture to polyisobutylene polymer while cooling the one or more tubes of the loop reactor with the heat transfer medium; and (e) withdrawing polyisobutylene polymer from the loop reactor.

Description

[0001] Cross References to Related Applications [0002] This application is based on US Provisional Application 61 / 551,576 filed on October 26, 2011 with the same title. Priority is hereby claimed from provisional application 61 / 551,576, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to the preparation of polyisobutene by cationic polymerization in a reaction medium with a low diluent content, characterized by high speed and increased circulation rate in a loop reactor operated with a relatively high pressure drop across the circulation pump and turbulence. Background technique [0004] Methods of cationic polymerizing olefins are known in the art. US Patent 6,858,690 to Webb et al. discloses a process for making butyl rubber in which processing efficiency, including heat transfer, is improved through the use of tertiary halogen initiators. See also, US Patent No. 3,932,371 to Powers, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/01C08F10/10B01J8/00
CPCC08F110/10Y02P20/582C08F2500/03C08F2500/17C08F2/00C08F2/01C08F4/14
Inventor S.K.沙伊克
Owner TPC GROUP