2 no 3 solution the ion exchanged membrane was then thermally treated in nitrogen at 300 u00b0 c with a heating rate and cooling rate of 1 u00b0 c min for eight hours the thermally treated membrane was subjected to uv irradiation upon ag ion modification thermal treatment and uv irradiation this zeolite composite membrane gave separation performance with propylene selectivity as high as 123 7 separation performance of the ets 10 membrane is set forth in fig3 and 4 in fig3 which represents the separation performance of the ets 10 membrane without metal doping the propylene propane selectivity is about 4 5 triangle dot and propylene permeance is about 0 34 u00d7 10 u2212 8 mol m 2 u00b7 s u00b7 pa square dot in fig4 which represents the separation performance of the metal doped ets 10 membrane the propylene propane selectivity is about 120 triangle dot and propylene permeance is about 0 85 u00d7 10 u2212 8 mol m 2 u00b7 s u00b7 pa square dot fig5 is a schematic representation of a zeolite membrane based device or apparatus useful for olefin paraffin separation according to the invention a device such as a cartridge 2 has a cylindrical body 4 closed with closed ends 6 and 8 closed end 6 has an inlet 12 for receipt of olefin paraffin feed mixture 14 and closed end 8 has an outlet 16 for retentate 20 that is olefin depleted mixture cylindrical body 4 has at least one outlet 22 for permeate 24 that is olefin enriched mixture cylindrical body 4 comprises zeolite membrane material preferably arranged in cylindrical porous structures 28 of alumina covered with a metal doped.