Regeneration of molecular sieve, used for separating lower alkanes from alkenes, involves stripping with superheated nitrogen stream to remove hydrocarbon oligomers and other compounds

摘要

Regeneration of molecular sieve (I) used for separating 3-6 carbon (C) alkanes from 3-6 C alkenes, to remove longer chain oligomeric hydrocarbons and/or compounds containing oxygen, nitrogen and sulfur, involves passing a stream of nitrogen (N2) as inert stripping gas at 200-280 deg C through a (I)-filled column, so that the volume ratio of total N2 (at 1013 mbar and 25 deg C) to (I) is (1000-20000):1.