Abstract: The invention is a liquid membrane process for separating a gaseous stream into a permeate stream of gases having predominantly lower equilibrium K values and a stream of gases having predominantly higher equilibrum K values, wherein the feed stream and the liquid membrane are operated at a temperature and pressure near a dew point of the feed stream in the two phase liquid/gas region of the phase envelope so that condensate from the feed stream will supply the liquid for the liquid membrane. The liquid membrane process is especially useful to separate hydrocarbon gases, such as a natural gas feed stream containing a large concentration of methane.