Method for refining caprolactam
The invention provides a method for refining caprolactam. The method comprises the following steps: providing a caprolactam-containing benzene solution to be refined; evaporating the caprolactam-containing benzene solution under normal pressure to remove benzene, thus obtaining molten crude caprolac...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The invention provides a method for refining caprolactam. The method comprises the following steps: providing a caprolactam-containing benzene solution to be refined; evaporating the caprolactam-containing benzene solution under normal pressure to remove benzene, thus obtaining molten crude caprolactam; adding a solvent to the molten crude caprolactam, hot filtering after the molten crude caprolactam is completely dissolved, thus obtaining a filtrate; and crystallizing the filtrate at 15-60 DEG C and separating centrifugally to obtain refined caprolactam. The method for refining caprolactam is simple in process flow and moreover the water consumption of the process is reduced greatly. |
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