Utilization of High Value-added Products Based on Crude Glycerol from Biodiesel Process

10% crude glycerol will be produced during the production of biodiesel. Therefore, in the industrialization progress of biodiesel, the effective utilization of crude glycerol becomes a major issue all over the world. The glycerol can be transformed into many products with highly added value, such as 1,3-propanediol, epichlorohydrin, lactic acid, polyhydroxyalkanoate, hydrogen, dihydroxyacetone and propylene glycerol, all of which show good market prospect. The processes of 1,3-propanediol fermentation and chemical epichlorohydrin production are being applied in a large scale, whereas other processes are still in the stage of laboratory research. Here we will present the technique and development status about the recycle of crude glycerol.