Methods for recovery of acids
US5434301A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1993 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Dec 1, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/92
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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 ac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.