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US 4,019,965 AGranted
Separation of phenol, cyclohexanone, and cyclohexylbenzene containing mixtures employing dialkyl and dicycloalkyl phthalates
AssigneePhillips Petroleum Company
InventorGeorge B. Fozzard
Life of this patent
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Abstract
Phenol, cyclohexanone, and cyclohexylbenzene containing mixtures are extractively distilled to provide overhead of cyclohexylbenzene and cyclohexanone and a kettle product substantially free of cyclohexylbenzene by employing a dialkyl and/or a dicycloalkyl phthalate. Co-agents or modifiers, e.g., sulfolane, polyalkylene glycols, etc., are advantageously used in some instances.
Claims4
An extractive distillation of a mixture containing phenol and cyclohexanone, which mixture may contain cyclohexylbenzene which comprises employing as a solvent at least one of dialkyl and a dicycloalkyl phthalate.
Dependencies are inferred from the claim text.