Methods for recovery of acids

Details Methods for recovery of acids Methods for recovery of acids

1993-12-01

1995-07-18

Cintins, Marianne M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfonic acids or salts thereof

562 89, 562 90, 562 91, 562 88, C07C14324

Patent

active

054343011

ABSTRACT:
A process for recovering sulfuric acid from a mixture containing sulfuric acid and organic sulfonation products is provided. The process comprises contacting a mixture comprised of sulfuric acid and (i) a naphthalene-based material selected from the group consisting of naphthalenesulfonic acids, lower-alkyl substituted naphthalenesulfonic acids, and mixtures of two or more of such materials, or (ii) an aromatic-based carbonyl condensate (preferably a material selected from the group consisting of formaldehyde condensates of naphthalenesulfonic acids, formaldehyde condensates of lower-alkyl substituted naphthalenesulfonic acids, and mixtures of two or more of such materials), with a basic anion exchange resin in essentially the sulfate form (and preferably in the form of essentially non-porous particles) to provide a raffinate liquid phase enriched with respect to said mixture in said naphthalene-based material and depleted with respect to said mixture in sulfuric acid. The raffinate liquid phase is removed from contact with the resin. The resin is then contacted with an aqueous liquid at an essentially neutral pH to form an extract liquid phase consisting essentially of sulfuric acid and removing said extract liquid phase is removed from contact with the resin.

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