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US 5,969,162 AGranted
Process for purifying phthalide
AssigneeBASF SE
InventorsWolfgang Reif, Klemens Massonne, Horst Neuhauser
Life of this patent
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Abstract
The disclosure is a process for purifying phthalide contaminated by carboxylic acids and/or their derivatives, which comprises adding polyethylene glycol and/or polypropylene glycol to the phthalide to be purified and then performing a fractional distillation.
Claims10
A process for purifying phthalide contaminated by carboxylic acids, carboxylic anhydrides and/or carboxylic esters, which comprises adding polyethylene glycol and/or polypropylene glycol to the phthalide to be purified and then performing a fractional distillation.
Dependencies are inferred from the claim text.