摘要
针对目前精细化工领域丁酮溶剂精制回收利用问题,本文提出了以环己烷为共沸剂的非均相间歇共沸精馏分离丁酮-水共沸混合物的方法。首先,对该非均相间歇共沸精馏进行了工艺模拟计算,模拟结果显示:常压下丁酮-水-环己烷三元体系形成三元最低共沸物,可以在正常操作条件下获得高纯精制丁酮,根据模拟结果得出了最优化操作参数,并依照该参数进行了丁酮-水-环己烷三元体系的非均相间歇共沸精馏实验,实验结果表明:粗丁酮溶剂中只需加入少量环己烷,经过脱水,脱共沸剂两个工艺步骤,就可以得到含量大于99.7wt%的高纯精制丁酮,且脱除的共沸剂因只含有溶剂丁酮可以循环使用,并且与模拟计算结果非常吻合。该方案可应用于工业生产,且能耗成本较目前通用工艺更低,对于目前的丁酮回收设计具有指导意义。
Aiming at the recovery and utilization of butanone solvent in fine chemical industry,a method of separating 2-butanone-water azeotropic mixture by heterogeneous batch azeotropic distillation with cyclohexane as azeotropic agent was proposed.Process simulation of the heterogeneous batch azeotropic distillation was firstly carried out,whose results showed that the lowest azeotrope was formed in the ternary system of 2-butanone-water-cyclohexane at atmospheric pressure;High purity purified butanone can be obtained under normal operating conditions.Simultaneously,According to the simulation results,the optimal operating parameters are obtained.then,the heterogeneous batch azeotropic distillation experiment of 2-butanone-water-cyclohexane ternary system was carried out.The experimental results showed that when only a small amount of cyclohexane was added to the crude 2-butanone solvent,through dehydration and azeotropic agent removal,high purity refined 2-butanone with a content of more than 99.7 wt%could be obtained.Further more,the azeotropic agent could be recycled because it contained only solvent 2-butanone.The experimental results are in good agreement with those of the simulation results.The scheme can be applied to industrial production,and the energy consumption cost is lower than the current general process,which has guiding significance for the current butanone recovery design.
作者
李芳盛
王许云
齐云国
LI Fang-sheng;WANG Xu-yun;QI Yun-guo(Qingdao University of Science and Technology,Gaomi 261500,China;Weifang Vocational College,Weifang 262737,China)
出处
《化学工程师》
CAS
2020年第5期25-29,共5页
Chemical Engineer
关键词
丁酮
环己烷
非均相
间歇共沸精馏
2-butanone
cyclohexane
heterogeneous
batch azeotropic distillation
