【摘要】 用精馏-降膜结晶耦合工艺分离对二氯苯。考察了降膜结晶操作中冷却剂温度、发汗升温速率对产品的影响,结果表明,冷却剂的温度为38℃,发汗速率为0. 5℃/min,可使w(对二氯苯)≥99 7%,单程收率>58%。与使用精馏工艺相比,总能耗下降71 7%。更多还原

【Abstract】 p-Dichlorobenzene was sperated from binary system of dichlorobenzenes using distillation—falling film crystallization hybrid processes.The influence of various process parameters including the temperature of coolant and the sweating heating rate was discussed.The results showed that when the temperature of the coolant was 38 ℃ and the heating rate was 0.5 ℃/min in the sweating,the total yield of p-dichlorobenzene could reach 58% and the purity of p-dichlorobenzene was over 99.7%.The energy cost of this new process was 71.7% less than that of existing process.更多还原