Zeolitic para-xylene separation with diethyltoluene heavy desorbent
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United States of America Patent
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Sep 5, 1989
Grant Date -
N/A
app pub date -
May 23, 1988
filing date -
May 23, 1988
priority date (Note) -
Expired
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Abstract
A chromatographic process able to separate para-xylene from 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 is selectively adsorbed onto the adsorbent. The feed is then removed from the adsorbent and the para-xylene recovered by desorption with diethyltoluene. The C.sub.9 's and the other xylene isomers in the raffinate, can be separated from this heavy desorbent by fractionation of the raffinate and the desorbent recycled to the process.
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