Process for purifying thioctic acid in water
US7547792B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Mar 21, 2006 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | Mar 21, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D339/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for purifying thioctic acid in water comprising the following steps: a) dissolving the thioctic acid in an aqueous alkaline solution or alternatively dissolving a thioctic acid salt, if necessary adjusting the pH to alkaline values, b) acidifying the solution from step (a) with an acid chosen from the class consisting of sulfuric acid, phosphoric acid, methanesulfonic acid to a pH between 5.4 and 5.8. c) isolating the thioctic acid precipitated in step (b) by conventional methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.