275290 Triflic Acid Catalyzed Continuous Alkylation of Isobutane and Butene with Ionic Liquids As a Promoter

Thursday, November 1, 2012: 5:15 PM
320 (Convention Center )
Haifang Li and Guoying Zhao, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China

                                                                     Triflic acid catalyzed continuous alkylation of isobutane and butene with ionic liquids as a promoter

Haifang Liab, Guoying Zhaoa*, Huiting Liua, Fangfang Liub,Suojiang Zhanga

a State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquid Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

b College of Chemical and Pharmacetical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China

*Corresponding author:   gyzhao@home.ipe.ac.cn

Abstract

The alkylation of isobutane with C3-C5 olefin is an important refinery process, which form a highly branched C8 paraffins mixture with high research octane number (RON) and free of sulphur and aromatics. An improved process for the continuous alkylation of isobutene and butene in the presence of the acidic ionic liquid catalysts which could be effectively tuned physical-chemical properties of the catalytic systems containing the acidity, solubility, density, viscosity, interfacial properties and so on were reported in this study. The acidic ionic liquids catalysts have been prepared from the quaternary ammonium-based ionic liquids with varied anion (such as BF4-, PF6- SbF6- or NTf2-) and triflic acid. In addition, several additives, including metal triflates, trifluoroethanol, PPh3 and so on, were used further to improve the catalytic performances. High-quality alkylate with up to 90% C8selectivity and 98 RON value were achieved with the optimized catalyst and operation condition. ICP-Mass, refractometer and UV spectroscopy were used to study the changing trends of the catalytic composition and catalytic performance as well as alkylate quality in the continuous process.

References:

[1] Tang SW, Scurto AM, Subramaniam B. Improved 1-butene/isobutane alkylation with acidic ionic liquids and tunable acid/ionic liquid mixtures. Journal of Catalysis. 2009; 268: 243-250

[2] Bui TLT, Korth W, Aschauer S, Jess A. Alkylation of isobutane with 2-butene using ionic liquids as catalyst. Green Chemistry. 2009; 11:1961-1967

[3] Camper D, Becker C, Koval C, Noble R. Low pressure hydrocarbon solubility in room temperature ionic liquids containing imidazolium rings interpreted using regular solution theory. Industrial & Engineering Chemistry Research. 2005; 44: 1928-1933

Acknowledgements

We would like to thank the financial support from the Beijing Municipal Natural Science Foundation (grand No. 2122052) and Key Program of National Natural Science Foundation of China (grant No. 21036007).


Extended Abstract: File Uploaded
See more of this Session: Liquid Phase Reaction Engineering
See more of this Group/Topical: Catalysis and Reaction Engineering Division