关键词: 环己酮, 碱洗, 分离, 工业规模

Abstract: In order to solve the waste lye separation problem of preparing cyclohexanone from cyclohexane, a gradient separation technique based on gravity sedimentation, hydrocyclone and coalescence techniques in series was proposed. Besides, a two stage countercurrent process of alkali wash was applied for the recycling water. This technology was adopted in the 80Kt/a cyclohexanone production unit of Baling Petrochemical Company successfully. The commercial application results showed that when the Na+ content of the 1st stage alkali wash separator inlet was in the range of 2.92%~3.20%, after treatment in the organic phase the contents of Na+ and water dropped form more than 6 mg/L (prior revamping) to less than 3 mg/L, and from 0.1%~0.2% (prior revamping) to 0.05%, respectively. The running length of alkane distillation column was prolonged from average 2 months to more than 9 months. Furthermore, the production cost was reduced, as well as less pollution.

Key words: cyclohexanone, caustic washing, separation, full scale