| 主权项 |
1. A process for the separation of a desired normal paraffin from a feed mixture comprising at least the desired normal paraffin and a non-normal paraffin comprising:
passing a feed stream comprising the feed mixture through a first bed of adsorbent comprising a shape selective adsorbent and located in an adsorbent chamber which contains a plurality of compartmentalized beds of the adsorbent separated by transfer points for streams used in the process, which adsorbent selectively retains the desired normal paraffin, passing a desorbent stream into the adsorbent chamber; withdrawing an extract stream comprising the desorbent and the desired normal paraffin from the adsorbent chamber; withdrawing a raffinate stream comprising the desorbent and the non-normal paraffin from the adsorbent chamber; periodically incrementing the transfer points in the adsorbent chamber of the feed, desorbent, extract and raffinate streams to simulate countercurrent movement of the beds of adsorbent and the feed stream; separating the desired normal paraffin from the desorbent in an extract column having a separation section comprising a rectifying section and a stripping section; separating the non-normal paraffin from the desorbent in a raffinate column having a separation section comprising a rectifying section and a stripping section; passing the desorbent through a column drying section to remove water from the desorbent, the column drying section comprising a plurality of drying trays, the column drying section positioned above the rectifying section in the raffinate column, the extract column, or both; and recovering the desired normal paraffin withdrawing an overhead vapor stream comprising about 50 wt. % the desorbent from the raffinate column, the extract column, or both. |
