شماره ركورد كنفرانس :
4518
عنوان مقاله :
Comparison of T and W zeolite membranes for separation of O2/SF6 mixtures
Author/Authors :
Hojjatollah Maghsoodloorad Research Centre for Membrane Separation processes- Faculty of Chemical Engineering- Iran University of Science and Technology, Tehran , Mojtaba Mirfendereski Research Centre for Membrane Separation processes- Faculty of Chemical Engineering- Iran University of Science and Technology, Tehran , Toraj Mohammadi Research Centre for Membrane Separation processes- Faculty of Chemical Engineering- Iran University of Science and Technology, Tehran , Afshin Pak Research Centre for Membrane Separation processes- Faculty of Chemical Engineering- Iran University of Science and Technology, Tehran
كليدواژه :
T zeolite membrane , W zeolite membrane , Gas separation , Ideal selectivity of O2/SF6 , Silicon module effect
چكيده لاتين :
Greenhouse effect is one of the most significant dilemmas in environmental aspects that cause
negative results in nature and society. SF6 is a very potent greenhouse gas. The global warming
potential of the gas is 23,900 times greater than that of CO2, and its atmospheric lifetime is about
3,000 years. Two different zeolite membranes (T (0.36 – 0.67 nm) and W (0.27 – 0.51 nm) were
synthesized and their performances were evaluated in separation of O2/SF6 mixtures. They were
selected due to their different silicon modules (SiO2/Al2O3) and their polarities. Effect of feed
pressure on separation of O2/SF6 was also investigated. The results showed that T zeolite
membrane (silicon module = 25) provides higher separation factor of O2/SF6 (50) compared with
W zeolite membrane (20.1). Also, increasing feed pressure from 3 up to 5 bar decreases separation
factor of O2/SF6 and increases O2 and SF6 permeances through both the zeolite membranes. From
the results, it was concluded that increasing pressure decreases the surface diffusion contribution
through the molecular sieve pores, and increasing the Knudsen flow and the viscous flow
contributions.
