采用分离集成技术从碳十芳烃中提取均四甲苯

采用萃取精馏和连续多级结晶相结合的分离集成技术从C_(10)芳烃中提取均四甲苯。选择甘油为萃取剂,考察实际塔板数、回流比、萃取剂与原料液的体积比(溶剂比)、进料量、结晶温度、结晶时间、抽滤时间等因素对分离均四甲苯的影响。萃取精馏条件:实际塔板数为106块、原料进料位置为第75块塔板、萃取剂进料位置为第5块塔板、溶剂比为1.0、回流比为4、原料进料量为2 mL/min,在此条件下,萃取塔顶馏分中均四甲苯的质量分数为42.7%,收率达到98.4%。连续多级结晶条件:结晶温度-6℃、结晶时间5 h、抽滤时间20 min,在此条件下,可将均四甲苯质量分数从42.7%提纯到99.18%,收率为90.95%。

Separation of Durene from C_(10) Aromatics by Integrated Separation Technologies

Separation of durene from C_(10) aromatics was carried out by integrated separation technologies of combining extractive distillation with multistage crystallization. Glycerol was selected as extractant. Effects of actual plate number, reflux ratio, volume ratio of extractant to feedstock (solvent ratio), feedstock flow rate, crystallization temperature, crystallization time and filtration time on separation of durene were investigated. Under optimal extractive distillation conditions: actual plate number 106 plate, feedstock position 75th plate, extractant feeding posion 5th plate, solvent ratio 1.0, reflux ratio 4 and feedstock flow rate 2 mL/min, mass fraction of durene in overhead and yield of durene can reach 42.7% and 98.4%, respectively. Under optimal multistage crystallization conditions: crystallization temperature -6 ℃, crystallization time 5 h and filtration time 20 min, mass fraction of durene crystal can reach farther from 42.7 % to 99.18 % and yield of durene is 90.95 %. The overall yield of the integrated separation technologies (by combining extraction distillation with multistage crystallization) is 89.49 %.