Partial dehydration of cyclohexanone oxime
AssigneeBASF SE
InventorsKurt Kahr, Hanns Pohl, Guenther Rapp, Peter Lauz
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Abstract
The application relates to a process for partial dehydration of cyclohexanone oxime by treatment with an aqueous solution of an inorganic salt, the crude cyclohexanone oxime being extracted at above its melting point countercurrently in an extraction column with a concentrated solution of ammonium or/and hydroxylammonium salt. The salt solution may be used again after concentration. This may be effected by simple evaporation.
Claims6
A process for partial dehydration of cyclohexanone oxime by treatment with an aqueous solution of an inorganic salt wherein crude cyclohexanone oxime is extrated countercurrently at a temperature of from 65.degree. C to the boiling temperature of the two-phase mixture in an extraction column with a concentrated solution of a salt selected from the group consisting of ammonium sulfate, hydroxylammonium sulfate, ammonium chloride, ammonium phosphate, and mixtures of ammonium sulfate and hydroxylammonium sulfate, and the salt solution is separated from the partly dehydrated cyclohexanone oxime, concentrated again by evaporation and returned for dehydration of the oxime.
Dependencies are inferred from the claim text.