(525e) Vapor-Liquid Phase Behavior of Reactive System of Isoamylene with Methanol to TAME

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

Yonghong Li^1,2
, 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).