SCI和EI收录∣中国化工学会会刊

›› 2009, Vol. 17 ›› Issue (5): 761-766.

• CATALYSIS, KINETICS AND REACTORS • Previous Articles     Next Articles

Improvement of Isomerization Process of Crude Isoamylene with Tertiary-amyl-alcohol Addition

XU Zehui1,2, XIA Ronghui1, GUO Shizhuo1, FAN Cunliang1, FANG Dingye2   

  1. 1. SINOPEC Shanghai Petrochemical Company Limited, Chemical Research Institute, Shanghai 200540, China;
    2. Department of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2008-12-02 Revised:2009-08-09 Online:2009-10-28 Published:2009-10-28

Improvement of Isomerization Process of Crude Isoamylene with Tertiary-amyl-alcohol Addition

徐泽辉1,2, 夏蓉晖1, 郭世卓1, 范存良1, 房鼎业2   

  1. 1. SINOPEC Shanghai Petrochemical Company Limited, Chemical Research Institute, Shanghai 200540, China;
    2. Department of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • 通讯作者: XU Zehui,E-mail:spcxzh@163.com

Abstract: The present work contributed to a new developed production method for enhancing the quality of isoamylene (IA) by adding a small amount of tertiary amyl alcohol (TAA) to the catalyst of strong acid cation exchange resin.TAA improved the selectivity of 2-methyl-2-butene (2M2B) at a high conversion level for the isomerization of IA.Compared with the other results from the current IA units,the conversion of 2-methyl-1-butene (2M1B),the mass ratio of 2M2B to 2M1B and the selectivity of 2M2B were increased from 0.5474,7.32 and 0.6864 to 0.72,12 and 0.95,respectively,while the dimers content in the products decreased from 4.38% to below 1.0%.Optimized conditions for IA isomerization consisted of temperature between 28 and 33℃ and system pressure of 0.5 MPa,weight hourly space velocity of 8.0 h-1 with TAA mass fraction of 0.7%-0.9% in raw material.The results in lab supported bases for the developed process in industrial application which was later proved to be successful.In addition,a possible mechanism of the isomerization process was speculated to propose a key step of water formation in the TAA-added isomerization process and a verified experiment was conducted to support this speculation.

Key words: isoamylene, 2-methyl-1-butene, 2-methyl-2-butene, isomerization process, tertiary amyl alcohol

摘要: The present work contributed to a new developed production method for enhancing the quality of isoamylene (IA) by adding a small amount of tertiary amyl alcohol (TAA) to the catalyst of strong acid cation exchange resin.TAA improved the selectivity of 2-methyl-2-butene (2M2B) at a high conversion level for the isomerization of IA.Compared with the other results from the current IA units,the conversion of 2-methyl-1-butene (2M1B),the mass ratio of 2M2B to 2M1B and the selectivity of 2M2B were increased from 0.5474,7.32 and 0.6864 to 0.72,12 and 0.95,respectively,while the dimers content in the products decreased from 4.38% to below 1.0%.Optimized conditions for IA isomerization consisted of temperature between 28 and 33℃ and system pressure of 0.5 MPa,weight hourly space velocity of 8.0 h-1 with TAA mass fraction of 0.7%-0.9% in raw material.The results in lab supported bases for the developed process in industrial application which was later proved to be successful.In addition,a possible mechanism of the isomerization process was speculated to propose a key step of water formation in the TAA-added isomerization process and a verified experiment was conducted to support this speculation.

关键词: isoamylene, 2-methyl-1-butene, 2-methyl-2-butene, isomerization process, tertiary amyl alcohol