摘要
Abstract
As the rapid development of biodiesel industry,the output of its by-product glycerol has increased sharply.High purity of glycerol has a great demand for food industry,domestic industry and pharmaceutical industry.This need a refine process to purify glycerol as a by-product of biodiesel.Usually,biodiesel after transesterification process can be centrifuged or settled to obtain unrefined glycerol.It consists of glycerol and the other impurities, such as the catalyst, coloring matters,salts,soaps,fatty acid.Moreover,glycerol has a larger viscosity and a higher boiling point, and it is also a heat-sensitive matter.All those made it difficult to separate and purify glycerol.In this paper,we give a brief introduction of a variety of glycerol purification process that has been reported in the literature, including flocculation, ethanol recrystallization, Sodium oxalate complex, ion exchange,membrane separation, reduced pressure distillation or molecular distillation, biosorption, reaction complex,and so on.Integrating one purification process with two or more processes will be a efficient proj ect for purifying glycerol from biodiesel.关键词
生物柴油/甘油/提纯Key words
biodiesel/glycerol/purification分类
化学化工
