The present invention relates to polymer membranes for separating olefins
from paraffins which have the similar molecular size and close boiling
point. More particularly, it relates to a silver salt-containing
facilitated transport membrane for olefin separation, and also a method
for producing the same. An object of the present invention is to provide a
silver salt-containing facilitated transport membrane for olefin
separation having improved stability, and also a method for preparing the
same, which exhibits no deterioration in membrane performance even when
operated for an extended period of time. The facilitated transport
membrane for olefin/paraffin separation of the present invention comprises
a polymer, a silver salt, and a phthalate compound represented by the
following formula (1)
##STR1##
wherein R denotes an alkyl group of 2 to 8 carbon atoms or a phenyl group.
