263375 Vapor-Liquid Phase Behavior of Reactive System of Isoamylene with Methanol to TAME

Wednesday, October 31, 2012: 1:46 PM
412 (Convention Center )
Yonghong Li, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China

Vapor-Liquid Phase Behavior of Reactive System of Isoamylene with Methanol to TAME

Yonghong Li1,2 , Chuanzhuang Feng1 and Jilian Dong1

(1) Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering, Tianjin University, Tianjin 300072, P. R. China

(2) National Engineering Research Center for Distillation Technology, Tianjin University, Tianjin 300072, P. R. China

 

Abstract

Etherification of isoamylene with methanol over cation-exchange resin catalysts to produce tert-amyl methyl ether (TAME) is the major chemical reaction for etherification of light gasoline which is expected to upgrade light gasoline by raising octane number. The etherification is reversible and exothermic so that it is beneficial to carry out the etherification in a catalytic distillation column. In this process, vapor¨Cliquid phase equilibrium (VLPE) is coupled with reaction which results in complex phase behavior.

In this paper, experiments of VLPE of quaternary mixtures, including methanol, TAME and two isoamylenes (2M1B and 2M2B), were performed in a novel circulation equilibrium cell packed with resin catalyst of D005II. The vapor-liquid phase behaviors coupled with the reaction were investigated at temperature of 338.15K, 348.15K and 358.15K. The reaction equilibrium constants at different temperatures were calculated using experimental data of phase equilibrium and reaction equilibrium equations, The activity-coefficient-models, including Wilson, NRTL and UNIQUAC, as well as the Soave-Redlich-Kwong equation of state were used to correlate the experimental data respectively. The correlation results showed that a good consistency between the experimental data and the Wilson model. This study provides with important thermodynamic information for the process design of etherification catalytic distillation of light gasoline.

Acknowledgments

We acknowledge gratefully the financial support of the Program of China Universities' Innovative Research Terms (No. IRT0936) and the financial support of CNPC (No.09020109).

 


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See more of this Session: Thermophysical Properties and Phase Behavior IV
See more of this Group/Topical: Engineering Sciences and Fundamentals