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US 7,547,792 B2Granted
Process for purifying thioctic acid in water
AssigneeLaboratorio Chimico Internazionale S.p.A.
InventorsAnnibale Salvi, Antonio Nardi, Giacomo Bruno
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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.
Claims9
Process for purifying thioctic acid comprising the following steps:
- a) dissolving the thioctic acid in an aqueous alkaline solution or alternatively dissolving a salt thereof and suitably adjusting to an alkaline pH,
- b) acidifying the solution derived 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 filtration.
Dependencies are inferred from the claim text.