(567b) Zeolite Membrane Reactor for High-Temperature Isobutane Dehydrogenation Reaction: Effects of Membrane Properties and Operating Conditions

Authors: 
Kim, S. J., Oklahoma State University
Dangwal, S., Oklahoma State University
Liu, R., Oklahoma State University
Zeolite Membrane Reactor for High-Temperature Isobutane Dehydrogenation Reaction:

Effects of Membrane Properties and Operating Conditions

 

Shailesh Dangwal, Ruochen Liu, Seok-Jhin Kim*

School of Chemical Engineering, Oklahoma State University,

420 Engineering North, Stillwater, OK 74078, USA

 

ABSTRACT

Isobutylene plays an instrumental role as an intermediate in many important chemical engineering processes. Its use in making gasoline oxygenates, fuel additives and butyl rubber adds up to its demand and stimulates research for new energy efficient ways for its production. Catalytic dehydrogenation of isobutane using a membrane reactor is a feasible solution not only because it helps in overcoming thermodynamic limitations by shifting the equilibrium towards isobutylene but also it substantially separates isobutylene by preferentially allowing only H2 to permeate through the membrane. In this study, dehydrogenation of isobutane in packed-bed membrane reactors operating with a Pt/Al2O3 catalyst is reported. The effects of MFI zeolite membranes on isobutane conversion, isobutylene selectivity and isobutylene yield are investigated experimentally and by simulations using a simple one-dimensional model. MFI membrane reactors allow the thermodynamic equilibrium limit of isobutane conversion to be surpassed at high temperatures. The experimental results and the model calculations demonstrate that medium-pore MFI membranes with good H2/i-C4H10 selectivity can effectively enhance isobutane conversion at high operation temperature by timely removal of H2 through the membranes. *Corresponding author: E-mail: seokjhin.kim@okstate.edu