Method of purifying caprolactam
A method of simultaneously purifying crude caprolactams obtained from the Beckmann rearrangement of cyclohexanone oxime in oleum and the gas-phase rearrangement of cyclohexanone oxime in the presence of catalysts. The improvement consists in that the crude caprolactam obtained from the catalytic gas...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
12.04.1977
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Subjects | |
Online Access | Get full text |
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Summary: | A method of simultaneously purifying crude caprolactams obtained from the Beckmann rearrangement of cyclohexanone oxime in oleum and the gas-phase rearrangement of cyclohexanone oxime in the presence of catalysts. The improvement consists in that the crude caprolactam obtained from the catalytic gas-phase rearrangement is added to the acid rearrangement mixture derived from the Beckmann rearrangement in oleum and the mixture is maintained at temperatures of from 100 DEG to 200 DEG C with thorough mixing, whereupon it is neutralized and worked up. Advantageously, the content of lactam in the catalytic gas-phase rearrangement is from 5 to 30% of the content of lactam in the acid rearrangement mixture obtained from the Beckmann rearrangement. |
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Bibliography: | Application Number: US19750603444 |