| 摘要 |
ADSORPTIVE SEPARATION OF PARA-XYLENE USING DIETHYLTOLUENE DESORBENT Para-xylene is separated from other C8 isomers and/or C9 aromatics by contacting the para-xylene-containing feed mixture with an X or Y zeolite adsorbent having Group IA or IIA cations, e.g., barium and/or potassium at exchangeable cationic sites. The para-xylene is selectively adsorbed onto the adsorbent. The feed is then removed from the adsorbent and the para-xylene recovered from the resulting rich adsorbent by desorption with diethyltoluene. The C9's and the other xylene isomers are typically recovered in the desorbent-containing raffinate and can be separated from this desorbent by fractionation of the raffinate and the desorbent recycled to the process. |
