Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1988-11-16
1990-02-20
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562582, 562593, C07C 5142
Patent
active
049028294
ABSTRACT:
A process for the separation of one or more hydroxy paraffinic dicarboxylic acids from a feed mixture comprising said acid(s), and one or more olefinic dicarboxylic acids which process employs an adsorbent comprising a non-zeolitic, hydrophobic, crystalline silica molecular sieve material, to selectively reject the hydroxy paraffinic dicarboxylic acid(s) to a raffinate stream for the ultimate recovery of a purified quantity of such acid(s). The olefinic dicarboxylic acid(s) are thereafter removed from the adsorbent by contacting the adsorbent with a desorbent material and said acid(s) is (are) recovered to an extract stream. In a preferred embodiment the process uses a silicalite adsorbent, aqueous acetone desorbent and a simulated moving-bed countercurrent flow system utilizing therein a pre-pulse technique.
REFERENCES:
patent: 2985589 (1961-05-01), Broughton et al.
patent: 3371112 (1968-02-01), Winstrom et al.
patent: 3391187 (1968-07-01), Cullen, Jr. et al.
patent: 3983170 (1976-09-01), Sumikawa et al.
patent: 4772749 (1988-09-01), Karrenbauer
Clarke Vera C.
Hall Jack H.
Lone Werren B.
McBride Thomas K.
Spears Jr. John F.
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