Patent ID: 9376354
Filing Date: 2016-06-28
CPC Classification: B01D,C07C,Y02P

Claim Text:
1. A method for separating an olefin from an olefin-containing mixed gas using at least one adsorption column and at least two distillation columns including a distillation column that separates an olefin rich stream and a desorbent and a distillation column that separates an olefin poor stream and a desorbent, the method comprising: i) adsorption step: introducing the olefin-containing mixed gas into an adsorption column packed with an olefin selective adsorbent to adsorb an olefin from the mixed gas, and discharging unadsorbed components and a desorbent retained in the adsorption column at a desorption step to the outlet of the adsorption column and then discharging them to the distillation column that separates an olefin poor stream and a desorbent; ii) rinse step: introducing a high-concentration olefin, obtained from the distillation column that separates an olefin rich stream and a desorbent, into the adsorption column, thereby removing paraffin and other gases from the adsorption, column to increase the purity of the olefin in the adsorption column; iii) desorption step: introducing the desorbent, which was separated from the distillation columns in the steps i) and ii), or another desorbent, which is introduced independently of the desorbent separated in the steps i) and ii), into the adsorption column having been subjected to the step ii), to desorb the olefin from the adsorption column so as to form an olefin/desorbent mixture, and then sending the olefin/desorbent mixture to the distillation column that separates an olefin rich stream and a desorbent, thereby producing a high-purity olefin; and before or after the step i), iv) recovery step: introducing an olefin-containing gas discharged from the rinse step into the adsorption column, thereby recovering an olefin from the olefin-containing gas.