Abstract :The energy is one of capital stocks in our developing modern life .Our country is extremely in lack of the oil resource.Hence, it is essentially strategic sense to research and develop the sustainable fuel instead of the crude oil, which could guarantee our country's energy security with development of the national economy healthily. Biodiesel , one kind of a biomas energy , has been used widely around the world since its good ignition character and renewable, environment friendly and so on.
As standard of our living environment is much better than before , the output of used dining oil also increases than ever,which is influenceing not only the city's environment seriously, but also the river we lived with. At present,it is a wise idea that we can reuse the cooking oil to save the energy and prevent environment fron being polluted.
The current method of producing biodiesel mainly chemical synthesis method .However, this method is easy to produce side effects, and will have disadvantages such as industrial wastewater pollution to the environment. In this article, the synthesis of biodiesel through the transesterification of waste oil as raw material catalyzed by phosphotungstic acid is carried out. Single factor experiments to determine the level of the orthogonal test, the winners of various single-factor optimum conditions to obtain the best level orthogonal experiments. Then the orthogonal experiment of reaction time, reaction temperature, catalyst and methanol to oil ratio on the conversion of raw materials affected, the optimum condition is reaction time 3 h, phosphotungstic acid accounted for 8wt% of waste oil , a molar ratio of 10 in methanol (methanol and fuel oil ratio of molar) .
Keyword:biodiesel; transesterification; waste cooking oil; substitute fuel; phosphotungstic acid
