Patent ID: 7518024
Filing Date: 2009-04-14
Classification: C07C

Abstract:
1. A process for preparing 1-butene from 1-butane, which comprises the steps A) provision of an n-butane-containing feed gas stream a; B) introducing of the n-butane-containing feed gas stream a into at least one dehydrogenation zone and nonoxidative catalytic dehydrogenation of n-butane to give a product gas stream b comprising n-butane, 1-butene, 2-butene, butadiene, low-boiling secondary constituents, hydrogen and possibly water vapor; C) removing hydrogen, the low-boiling secondary constituents and optionally water vapor to give a C D) introducing the C E) separating of the stream d by distillation into a desired product stream e1 consisting essentially of 1-butene and a recycle stream e2 consisting essentially of 2-butene and n-butane and recirculation of the recycle stream e2 consisting essentially of 2-butene and n-butane to the dehydrogenation zone, wherein the stream e1 contains at least 90% by volume of 1-butene, and the stream e2 contains 10-80% by volume of 2-butene, 20-90% by volume of n-butane and 0-5% by volume of 1-butene.