Method for making a carbon molecular sieve membrane, process for separating a gas molecule from a gas feed, and carbon molecular sieve membrane and module

摘要

The invention is an improved method of making a carbon molecular sieve (cms) membrane in which a precursor polymer is pyrolyzed to form a carbon molecular sieve membrane which is then exposed to a conditioning atmosphere consisting of a target permeated gas molecule. such as ethylene when the membrane is to be separated from a light hydrocarbon gas stream. exposure to ethylene desirably occurs prior to the combination of substantially changing (e.g., within 5 days) cms permeability and selectivity of cooling of the pyrolysis temperature. cms membranes have shown an improved combination of selectivity and permeability as well as stability, and are useful for separating gases into gaseous streams such as natural gas methane, air oxygen and ethylene or propylene from light hydrocarbon streams.