Preparing DDR type zeolite membrane composite for gas separation

Know as a refining method of a natural gas is a method using a separation membrane.Application of organic mambranes is limited by their low thermal and chemical stablility. Recenthly the molecular-sieve inorganic membrane has been studied extensively.DDR type zeolites are regarded as good candidates to be utilized for this purpose.This membrane has an industrially acceptable thi ckness and is formed on a substrate.This membrane separates at least one type of a gas mixture including identified gases specially 2 CO and 4 CH .For increasing mechanical strength of this membrane, a method for preparing DDR membrane composite,is described.