Phychemical properties and preparation of bio-diesel with five categories of woody plant seeds oil.

Five categories of wild plants (Styrax tonkinesis,Pistaciachinensis bunge,Symplocos paniculata,Sapium sebiferum,Comus wilsoniana)were picked out to extract respectively their lipids and their phy-chemical constants,compositions and contents of fatty acid were determined.Then the lipids were treated with Ester-exchange reaction to prepare bio-diesel.The results showed that the oil yields of seeds were,Styrax tonkinesis:53.6%,Symplocos paniculata:33.0%,Sapium sebiferum:20.0%,Pistaciachinensis bunge:22.0%,Comus wilsoniana:28.6%;the oils mainly included Palmitc acid,Stearic acid,Oleic acid,Linoleic acid and Linolenic acid,which mostly contained 16 carbon and 18 carbon fatty acid and the content of unsaturated fatty acids was up to 90%;the phy-chemical properties,compositions and contents of fatty acid of the oils were consistent with the bio-diesel standards.The five categories of wild plant oils were used to prepare bio-diesel,the conversional rate was 95%,the performance of the converted oil is close to that of diesel oil No.0.