Low temperature purification of naphthalene dicarboxylic acids
AssigneeBP Corporation North America Inc.
InventorBruce I. Rosen
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Abstract
A process for purifying a naphthalenic carboxylic acid comprising contacting at a temperature below about 575° F. a mixture comprising an impure naphthalenic carboxylic acid and a solvent in the presence of hydrogen gas with a noble metal on carbon catalyst. The process results in reduced amounts of organic impurities in the purified acid when compared to other purification processes.
Claims20
A process for purifying a naphthalenic carboxylic acid comprising contacting an impure naphthalenic acid and a purification solvent in the presence of hydrogen with a catalyst comprising a Group VIII noble metal at a purification temperature of from about 520 to 575° F.
Dependencies are inferred from the claim text.