Journal of Chemical Engineering & Process Technology
Open Access
ISSN: 2157-7048
+44-20-4587-4809
ISSN: 2157-7048
+44-20-4587-4809
Seyed Mojtaba Mirfendereski
Shahid Beheshti University, Iran
Posters & Accepted Abstracts: J Chem Eng Process Technol
In this paper, high permeable zeolite W membranes were synthesized for separation of CO2 from CH4. The effects of synthesis parameters (temperature, time and coating repetition) on permeability and selectivity of synthesized membranes were investigated. Experiments were carried out at three levels of synthesis temperature: 165, 185 and 200�?°C; synthesis time: 6, 12 and 18 h and two levels of coating: 1 and 2 layers. The CO2 and CH4 permeabilities versus synthesis temperature first decreased with increasing synthesis temperature from 165�?°C up to 185�?°C, then increased with further increasing the values of synthesis temperature. These permeabilities decreased with increasing synthesis time from 6 h up to 12 h and continued decreasing up to 18 h. In the case of CO2/ CH4 selectivity, reverse trends were observed. This behavior was attributed to the dual effect of increasing synthesis temperature and time on membrane permeability and selectivity. Repetition of zeolite layer coating strongly increased membrane selectivity and decreased permeability for CO2/CH4 mixture. Zeolite layers were thickened and larger crystals were formed at higher synthesis temperatures and times. Formation of larger crystals accelerated the rate of zeolite layer integration, which was responsible for gas separation, in one hand and reduced the density of deposited zeolite layer on the support, due to void increase, on the other hand. Gas permeances through the membranes were in the range of 10-8 to 10-7 (mol/m2 s Pa) which showed high permeable zeolite membranes were synthesized. In terms of maximizing the CO2/CH4 selectivity (=20.1), medium synthesis temperature with high synthesis time (185�?°C and 18 h) and two layer coating were selected. High permeable zeolite W membranes with moderate selectivity were successfully synthesized in this work. Hence, it can be used for the separation of CO2 from CH4 in commercial applications.