PRODUCTION OF HIGH PURITY OF BUTENE-1 FROM C4 OLEFINS/PARAFFINS MIXED GAS

摘要

A method for separating butene-1 from a mixture gas comprising a C4 olefin and a paraffin, and its apparatus are provided to reduce the loss of butene-1 in case of the removing isobutane and to lower the concentration of n-butane. A method for separating butene-1 from a mixture gas comprising C4 olefins and paraffins comprises the steps of: introducing a mixture gas comprising C4 olefins and paraffins into an adsorption tower to adsorb olefins to separate paraffins; introducing the some part of the obtained C4 olefins of high purity to wash out the adsorbed paraffins of small quantity for improving the purity of olefins; introducing a desorber to desorb C4 olefins; and distilling C4 olefins to obtain butene-1, wherein the absorption, washing and desorption are carried out continuously and repeatedly at three adsorption towers and the three adsorption towers carry out the different processes at the identical point.