Method for recycling cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid
The invention provides a method for recycling cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid. The method includes the following steps that cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid to be recycled is provided;...
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| Hauptverfasser: | , , , , , |
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention provides a method for recycling cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid. The method includes the following steps that cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid to be recycled is provided; a solvent is added into the cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid for dissolution, and mixed liquid is obtained; the mixed liquid is crystallized at 15-60 DEG C, and after centrifugal separation, coarse caprolactam is obtained; after coarse caprolactam is subjected to solvent removal, distillation is carried out, and caprolactam is obtained. According to the method for recycling the cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid, by dissolving the cyclohexanone-oxime vapor phase rearrangement product fractionation heavy residual liquid in the solvent and carrying out crystallization and distillation, caprolactam is obtain |
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