Patent ID: 8431762

Claim:
A method for separating butene-1 from a mixture gas of C4 olefins/paraffins by distilling C4 olefins obtained after the separation of the C4 olefins from a mixture gas of C4 olefins/paraffins by performing displacement desorption using desorbents, in a separating apparatus of several adsorption towers loaded with adsorbents which selectively adsorb olefins, a distillation tower for the separation of olefins/desorbents and a distillation tower for the separation of paraffins/desorbents, the method comprising: adsorbing olefins by introducing the mixture gas of C4 olefins/paraffins into the adsorption towers loaded with adsorbents and discharging non-adsorbed paraffins and the desorbents retained in the adsorption tower at the desorption step to the outlet of the adsorption tower and then discharging them to the distillation towers that separates parrafins and desorbents; rinsing with C4 olefin to increase the purity of olefins by introducing a portion of high purity C4 olefins resulting from the distillation process of olefins/desorbents into the adsorption towers after the completion of the adsorption and cleaning a small amount of paraffins adsorbed together with olefins; desorbing C4 olefins by introducing desorbents into the adsorption towers after the completion of the rinsing and discharging the mixture of olefins/desorbents to the distillation towers that separate olefins and desorbents to produce high purity olefins; and distilling the produced C4 olefins to obtain the butene-1.