混合溶媒异丙醇-乙二醇二甲醚精馏分离研究  

Study on distillation separation of isopropanol-ethylene glycol dimethyl ether mixture

作　　者：黄嘉琳 许松林[1] 杨义龙 Huang Jialin;Xu Songlin;Yang Yilong(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;Anhui Biochem United Pharmaceutical Co.Ltd.,Hefei Anhui 236604,China)

机构地区：[1]天津大学化工学院,天津300350 [2]安徽贝克联合制药股份有限公司,安徽合肥236604

出　　处：《石油化工》2020年第8期773-778,共6页Petrochemical Technology

基　　金：国家重点研发计划项目(2016YFF0203802)。

摘　　要：采用NRTL热力学模型对异丙醇(IPA)-乙二醇二甲醚(DMEN)二元体系进行研究,以加压精馏为回收该溶媒的分离手段,考察了IPA-DMEN体系分离的操作压力和气液平衡关系及相对挥发度,建立了实际精馏装置,并与实际分离结果进行对比。实验结果表明,IPA-DMEN体系适宜的操作压力为5.07×10^5 Pa,加压可使体系的相对挥发度明显提高,建立的实际精馏装置塔顶产品中IPA的含量为98.0%(w)以上,塔底产品中DMEN的含量为99.5%(w),满足企业溶媒的循环使用要求,NRTL、Wilson和UNIQUAC模型得到的分离结果与实际生产装置的分离结果非常接近,而UNIFAC模型得到的分离结果与生产装置的分离结果相差较大,进一步表明采用NRTL热力学模型模拟具有合理性。The NRTL thermodynamic model was selected to study the isopropanol(IPA)-ethylene glycol dimethyl ether(DMEN)binary system,and the pressurized distillation was determined as the separation method to recover the mixture.The operating pressure,vapor-liquid equilibrium relationship and relative volatility of the IPA-DMEN system were investigated,and the actual distillation column was established,then the calculated results with the actual separation results were compared.The result shows that the appropriate operating pressure of the IPA-DMEN system is 5.07×10^5 Pa.The relative volatility of the system could be increased obviously by increasing pressure.In the real distillation device,IPA in the top product is above 98.0%(w)and DMEN in the bottom product is above 99.5%(w),which met the demand of enterprise of recycling of solvent.The results obtained by NRTL,Wilson and UNIQUAC models are very close to the separation results of the actual production equipment,but the results obtained by UNIFAC model are greatly different from the separation results of the actual production equipment.It shows that the NRTL thermodynamic model is reasonable.

关 键 词：异丙醇 乙二醇二甲醚 热力学模型 气液平衡 加压精馏 

分 类 号：TQ028.3[化学工程]