Separation of alkenes with organic and inorganic composite membranes
Abstract
In this study the separation of two alkenes, ethene and butene, which have similar
physical properties, was attempted for industrial gas purification. Using both inorganic (ceramic
and zeolite NaA) and polymeric (Teflon AF 2400) coated ceramic membranes, a mixture of 70 %
ethene and 30 % butene was separated. Both membranes showed promising single gas
permeation, where the best inorganic ideal selectivity (α = 9), was obtained for the NaA coated
ceramic membrane. The Teflon AF 2400 coated ceramic membrane had an ideal selectivity of 31.
For the binary mixture, the NaA coated ceramic membrane was however not able to separate the
mixture satisfactorily, probably due to intercrystalline boundary diffusion. The Teflon coated
membrane yielded a selectivity o 4 with a permeate permeance of 1.98×10-3 mol.s-1.m-2.bar-1
URI
http://hdl.handle.net/10394/16510http://www.icheme.org/communities/countries/south_africa/sajche/2013/separation-of-alkenes-with-organic-and-inorganic-composite-membranes.aspx