阴极电泳乳液脱除溶剂中甲基异丁基酮的精制工艺模拟

对阴极电泳乳液脱除液中典型溶剂一甲基异丁基酮、丁酮和水的剩余曲线及共沸组成进行分析,提出了精馏-倾析联用工艺分离该混合溶剂的流程。应用流程模拟软件Aspen Plus进行模拟和灵敏度分析,确定了精馏塔的最佳塔板数、原料进料位置、回流比及液-液倾析器参数,得到质量分数大于99.5%的MIBK产品,且回收率超过95%,实现了阴极电泳乳液脱除液中甲基异丁基酮的高效回收。通过对分离系统各塔冷凝器和再沸器热负荷的计算,得到了处理量为6000 kg/h阴极电泳乳液脱除液分离系统所需要提供的冷却水量约56.25t/h,需要提供的中压饱和蒸汽(1.9 MPa)约为1.9I t/h。研究结果可为生产装置的设计和能耗的控制提供重要参考。

Process simulation of refinement of methyl isobutyl ketone from the solvents taken out of the cathodic electrophoretic emulsion

A distillation-decantation combined process for separation of ordinary solvents—methyl isobutyl ketone(MIBK),butanone-2 and water from cathodic electrophoretic emulsion was proposed through analyzing the residue curve map of the solvents.The separation process was simulated by the process simulation software of Aspen Plus.The column parameters such as the number of stages,feed stage,reflux ratio were optimized by simulation and sensitivity analysis.The simulation results showed that the final MIBK product with the purity higher than 99.5%could be obtained and the one-way recovery rate could exceed 95%under given parameters of each device.MIBK was effectively recovered from the solvents taken out of the cathodic electrophoretic emulsion.The results also showed that the treatment of 6000 kg/h solvents needs cooling water of 56.25 t/h and mid-pressure(1.9 MPa) steam 1.91 t/h by the calculation of the thermal load.The results obtained can give guidance to the design of column and the control of energy consumption in actual production.