Separation of hydroxy paraffinic dicarboxylic acids from...

Details Separation of hydroxy paraffinic dicarboxylic acids from... Separation of hydroxy paraffinic dicarboxylic acids from...

C - Chemistry, Metallurgy

07

C

260/533.1

C07C 51/47 (2006.01) C07C 59/245 (2006.01)

Patent

CA 2009927

"SEPARATION OF HYDROXY PARAFFINIC DICARBOXYLIC ACIDS FROM OLEFINIC DICARBOXYLIC ACIDS" ABSTRACT One or more hydroxy paraffinic dicarboxylic acids from a feed mixture comprising said acid(s) are separated, and one or more olefinic dicarboxylic acids which process employs an adsorbent comprising a hydrophobic, crystalline silica molecular sieve material, to selectively adsorb the olefinic dicarboxylic acids and to 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 resulting 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 prepulse technique.

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