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针对双塔精馏回收环己醇工艺,采用Fenske-Underwood-Gilliland-Kirkbride方程和Rad Frac模块对双塔进行简捷设计和严格模拟,保证预分离塔条件不变,利用响应面优化法(RSM)对萃取精馏塔的设计参数进行实验设计,得到最终优化的操作条件:预分离塔板数N1=28,环己醇进料流量F=440 kg/h,操作压力P1=-0.007 5 MPa,回流比R1=6.5;萃取精馏塔塔板数N2=22,操作压力P2=96.401 k Pa,回流比R2=2.49,萃取剂水质量分数为0.36。在最佳操作条件下,塔顶环己醇质量分数为95.9%,环己醇回收率为84.2%,投资成本5.34×10~6元,运行成本为2.19×10~6元,为环己醇回收工艺提供模型和数据基础。
Aiming at the double-column distillation recovery cyclohexanol process, the simple and rigorous simulation of twin towers was carried out by using Fenske-Underwood-Gilliland-Kirkbride equation and Rad Frac module to ensure that the conditions of pre-separation column were unchanged. The response surface optimization (RSM) The design parameters of the extractive distillation column were designed experimentally to obtain the final optimized operating conditions: pre-separation plate number N1 = 28, cyclohexanol feed flow F = 440 kg / h, operating pressure P1 = -0.007 5 MPa, Reflux ratio R1 = 6.5; extractive distillation tray number N2 = 22, operating pressure P2 = 96.401 kPa, reflux ratio R2 = 2.49, extractant water mass fraction of 0.36. Under the optimal operating conditions, the mass fraction of cyclohexanol in the top of the column was 95.9%, the recovery rate of cyclohexanol was 84.2%, the investment cost was 5.34 × 10 ~ 6yuan and the operating cost was 2.19 × 10-6 Yuan, Recycling process provides model and data foundation.