Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By plural serial diverse separations
Patent
1991-12-23
1993-01-05
McFarlane, Anthony
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By plural serial diverse separations
585828, C07C 700, C07C 712
Patent
active
051772957
ABSTRACT:
In the process flow scheme for chromatographically separating para-xylene from C.sub.8 isomers containing substantial amounts of C.sub.9 aromatic hydrocarbon impurities with BaX or KY zeolite adsorbent and heavy desorbents, e.g., tetralin and diethyltoluene, a bottoms stream from the extract fractionation column containing desorbent is recycled to the separation unit and a sidecut stream, containing C.sub.9 aromatic hydrocarbon impurities and a minor amount of the desorbent from the raffinate stream, is directed to the raffinate fractionation column, thereby removing C.sub.9 aromatic hydrocarbons from the desorbent before recycling the desorbent to the separation unit, and preventing C.sub.9 aromatics from building up in the desorbent input. A fractionator for the extract column bottoms stream is eliminated, lowering capital costs, and energy requirements for the raffinate column are reduced.
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Anderson Gary C.
Johnson James A.
Oroskar Anil R.
Prada Roberto E.
Zinnen Hermann A.
Hall Jack H.
McBride Thomas K.
McFarlane Anthony
Phan Nhat
Spears Jr. John F.
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