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US 5,312,935 AGranted
Purification of fluorinated carboxylic acids
AssigneeHoechst Aktiengesellschaft
InventorsLudwig Mayer, Gernot Lohr
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Abstract
Fluorinated carboxylic acids which do not have the required purity for use as emulsifier in the polymerization of fluorinated monomers can, if necessary after prior de-watering, be treated with oxidants, whereupon the isolation of the pure product is carried out by crystallisation or, preferably, by distillation.
Claims17
A process for the purification of an impure perfluorinated carboxylic acid, which process comprises:
- oxidizing the impurities in a reaction mixture comprising a water content of less than about 9% by weight, impure perfluorinated carboxylic acid and an oxidant, thereby purifying said acid, and isolating the resulting purifies perfluorinated carboxylic acid.
Dependencies are inferred from the claim text.