method for producing a carbon molecular sieve membrane, process for separating a gas molecule from a feed gas, and carbon molecular sieve module

摘要

It is an improved method of producing a carbon molecular sieve membrane (CMS) in which a polyimide precursor polymer is pyrolyzed to form a carbon molecular sieve membrane by heating said oven. polyimide precursor polymer at a final pyrolysis temperature of 600 ° c to 700 ° c at a pyrolysis heating rate of 3 to 7 ° c / min from 400 ° c to the final pyrolysis temperature, with the Final pyrolysis temperature is retained for a maximum pyrolysis time of 60 minutes in a non-oxidizing atmosphere. In a particular embodiment, the rate of cooling of the pyrolysis temperature is accelerated by methods to remove heat. CMS membranes have shown an improved combination of selectivity and permeability and are particularly suited for separating gases into gas streams such as natural gas methane, air oxygen and ethylene or propylene from light hydrocarbon streams.