Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (7): 771-776.DOI: 10.11944/j.issn.1000-0518.2015.07.140397

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Product Analysis and Reaction Mechanism of High-Pressure Synthesis of Sulfurized Isobutylene by One-Step Method

LI Fei, JIANG Heng, ZHAO Shanlin*, LI Ping   

  1. School of Chemistry and Materials Science,Liaoning Shihua University,Fushun,Liaoning 113001,China
  • Received:2014-11-18 Accepted:2015-03-25 Published:2015-06-30 Online:2015-06-30
  • Contact: Shanlin ZHAO
  • Supported by:
    Supported by the National Natural Science Foundation of China (No.21171083)

Abstract:

Sulfurized isobutylene was prepared from sulfur and isobutylene via high pressure one-step method at 160~190 ℃ with n-octylamine as catalyst. GC, FT-IR and 1H NMR analyses of the final products show that it contains chain-like and cyclic polysulfides, chain-like polysulfides are main products, accompanied with the byproducts 4-methyl-3H-1,2-dithiole-3-thione (MDTT), tert-butyl mercaptan, and a small amount of exhaust gas such as H2S. The formation of MDTT and H2S is the result of the hydrogen abstraction reaction from isobutylene catalyzed by alkali in the sulfurization process. H2S then reacts with isobutylene by Markovnikov addition to the formation of tert-butyl mercaptan which is converted to linear polysulfides by reaction with sulfur.

 

Key words: sulfurized isobutylene, methyl-3H-dithiole-thione, chain-like tert-butyl polysulfides, reaction mechanism

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