Combinatorial Methodology on Zeolite Membrane Development for Organic Chemical Process Intensification
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0894-LL03-08.1
Combinatorial Methodology on Zeolite Membrane Development for Organic Chemical Process Intensification
Tomoya Inoue, Yasuhisa Hasegawa, Takako Nagase, Yoshimichi Kiyozumi, Satoshi Hamakawa, and Fujio Mizukami Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Sendai, Miyagi 983-8551, Japan
ABSTRACT Combinatorial methodology for zeolite membrane development is discussed. Zeolite membrane is now attracting attentions as an energy-saving separation apparatus via pervaporation and/or vapor permeation, but sometimes it suffers performance (flux and/or separation factor) deterioration due to lack of chemical stability. We separate the development scheme into three steps – i) zeolite selection via chemical affinity and stability evaluation in powder applying combinatorial methodology, ii) membrane preparation for thus selected zeolite species, and iii) their evaluation in parallel manner. We have successfully developed hydrophilic zeolite membranes with tolerance against acidic environment. Thus developed zeolite membranes were successfully applied esterification reaction from a stoichiometric mixture of a carboxylic acid and an alcohol by assisting equilibrium shift via direct pervaporation from crude reaction solution.
INTRODUCTION Separation via zeolite membrane permeation has been attracting attentions recently, and one of the successful examples is commercialization of alcohol dehydration plant[1, 2]. But zeolite consisting this membrane is sodium substituted LTA type (NaA zeolite), which is readily erode during separation by pervaporation or vapor permeation due to lack of acid-tolerance. Once hydrophilic zeolite membrane with acid-tolerant character is prepared, we can apply the membrane for various kinds of applications – dehydration from process solution in wafer rinsing solution, biomass refinary as well as chemical process intensification [1, 3, 4].
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High throughput experimentation (HTE) based on combinatorial technology has been recognized as powerful methodology for material discovery including new zeolites [5]. If we try to develop zeolite membranes for chemical process intensification, we have to propose appropriate type of zeolite membrane within limited schedule in the case of process development for fine chemicals [6]. We are now trying to establish high throughput experimentation scheme for zeolite membrane development in order to meet the requirement.
Experimental Details HTE scheme for zeolite membrane development
Structural Selection Chemical Affinity Selection (Comparison of water adsorption and that of ethanol)
Zeolite screening By powder
Chemical Stability Selection (XRD deterioration check during HCl solution immersion)
Zeolite membrane Preparation By Secondary growth
Membrane Evaluation by Reaction solution Evaluation by Esterification
Figure 1.
Zeolite Membrane Screening
Scheme for developing zeolite membrane was described in Fig. 1. Briefly, we start from the selection of zeolite fro
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