Caprolactam refining method and system

• Main Authors: HAO SHUNLI, SHI YONGQING, ZHAO MING, CHEN XIBO, LI BIN, LU TAO, CHENG SHIBIAO, DU LIN, XU ZHIQI
• Format: Patent
• Language: Chinese; English
• Published: 02.07.2024
• Subjects: CHEMISTRY; HETEROCYCLIC COMPOUNDS; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a caprolactam refining method and system. According to the caprolactam refining method disclosed by the invention, the amide oil is directly subjected to aqueous solution evaporative crystallization under specific conditions, and after caprolactam crystals are separated, the caprolactam crystals are further rectified to obtain the caprolactam. The caprolactam refining method provided by the invention can directly refine caprolactam from amide oil, has the advantages of short flow and low energy consumption, and can prepare a caprolactam product with high yield, high quality and high value. Moreover, according to the caprolactam refining method disclosed by the invention, the energy consumption can be further reduced by recycling the steam. 本发明公开一种己内酰胺精制方法及系统。本发明的己内酰胺精制方法在特定条件下直接对酰胺油进行水溶液蒸发结晶，分离己内酰胺晶体后，进一步对其进行精馏得到己内酰胺。本发明的己内酰胺精制方法可以从酰胺油中直接精制己内酰胺，其流程短、能耗低，能够制得高收率、高品质、高价值的己内酰胺产品。并且，本发明的己内酰胺精制方法可以通过对蒸汽循环利用，实现能耗的进一步降低。