环己酮装置废碱液分离技术的工业应用

为解决环己烷氧化法制备环己酮中氧化液废碱的分离问题，提出了将重力沉降技术、旋流分离技术和聚结分离技术依次串联组合的梯度分离技术，同时采用较为先进的两段逆流碱洗工艺，实现水的循环利用。该技术在巴陵石油化工有限责任公司80kt/a环己酮生产装置上的应用结果表明，当一级碱洗分离器进口Na+含量在2.92%～3.20%，经过碱洗分离系统处理后，聚结器出口有机相中Na+的质量浓度由改造前的6 mg/L以上降低为3mg/L以下，聚结器出口有机相中水含量由改造前的0.1%~0.2%降低为0.05%左右。环己酮生产工艺中烷蒸馏塔工作周期由改造前的平均2个月延长至9个月以上，实现整套装置长周期稳定运转。同时，降低了生产成本，减少了环境污染。

COMMERCIAL APPLICATION OF THE SEPARATION TECHNOLOGY FOR WASTE LYE OF CYCLOHEXANONE PRODUCTION UNIT

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.