用氟化钾水溶液从制药废液中回收异丙醇的工艺研究

Study on the Technology of Recovering Isopropanol with Aqueous Potassium Fluaide

采用普通精馏与加盐分相技术回收异丙醇。测定了异丙醇-水-氟化钾体系在恒温(40℃)时的液-液相平衡数据,并用Pitzer理论和Wilson方程对液-液相平衡数据进行了理论计算。结果表明:计算值与实验值符合良好;采用氟化钾水溶液回收异丙醇,当60.0％氟化钾浓溶液与50％异丙醇-50％水的物料的质量比为2.0时,有机相中异丙醇的纯度可达95.62％(质量百分数),水相中氟化钾稀溶液经蒸发回收后循环使用不影响分离性能。采用以上技术从制药废液中回收异丙醇,每年可获经济效益342万元。

Recovering isopropanol by simple distillation and phase separation with salt has been studied. The liquid-liquid equilibrium data of isopropanol-water-KF system were measured at 40℃. The calculated results of the liquid-liquid equilibrium data were carried out by using Pitzer theory and Wilson equation. The results showed that the calculated and experimental results were in good agreement. The separation of iso-propanol-water system using aqueous potassium fluoride has also been studied, the purity of isopropanol (as mass fraction) in organic phase could reach 95.62% when the mass ratio of high concentration of potassium fluoride in aqueous (potassium fluoride/water=60/ 40)to separated material (isopropanol/water=50/50)was 2.0. The lower concentration of potassium fluoride in aqueous phase could be recovered by evaporation and the recovered potassium fluoride solution could be recyled. The separation efficiency of isopropanol-wa-ter system was not decreased. Isopropanol valued as 3420 thousand yuan could be recovered from waste pharmaceutical liquor with above technology, which provide a new method to recover isopropanol from waste pharmaceutical liquor in pharmacy industry.