精馏法与渗透汽化膜分离法在甲醇脱水提纯过程中的能耗比较

Comparation of energy consumption by distillation and pervaporation method in the process of methanol dehydration and purification

在生物柴油生产中，酸值（KOH）为100-150mg／g的地沟油等高酸价油脂预处理后剩余甲醇含有3％～5％的水。对于含水4％的甲醇，实验室合成的亲水性渗透汽化膜渗透通量为3．280kg／（h·m2），分离系数为88．9。文章以小试合成的渗透汽化膜为基础，做了处理量为250kg／h的甲醇精馏和渗透汽化提纯的能耗计算，渗透汽化膜分离法能耗是精馏法的27％。

After the pretreatment of high acid value oils such as trench oil with an acid value about KOH 100-150 mg/g for biodiesel production,the water content of the methanol is about 3%- 5%. The hydrophilic membrane synthesised in our laboratory can separate the water content of 4% methanol solution, which permeate flux is 3.280 kg/（h＇m2）and separation coefficient is 88.9. Based on this membrane pervaporation activity,the energy consumption of 250 kg/h methanol distillation and pervaporation are calculated. The results showed that energy consumption of the pervaporation process is 27% of the distillation process.