A chromatographic process able to separate para-xylene frpm C.sub.8 isomers and C.sub.9 aromatics. In the process, the para-xylene-containing feed mixture is contacted 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...http://www.google.com.au/patents/US5057643?utm_source=gb-gplus-sharePatent US5057643 - Zeolitic para-xylene separation with tetralin derivatives as heavy desorbent
