Optimization of technological conditions in synthesis biodiesel from waste oil with supercritical methanol;

Taking waste oil as raw material of biodiesel was in accordance with the situation of our country.

With waste edible oil as raw material to produce biodiesel,free fatty acid has to be removed before used,it will be impractical because the process is complex and the cost is high.

Comprehensive utilization of waste grease

The development status,the production process,the main process parameters and the quality standards of the biodiesel are introduced and suggestions on the development of biodiesel produced by recycling waste grease are also given in the paper.

As a result, It forecasts that, two conversion technological process including bio-diesel made by waste grease especially from grease trap waste and wild oil-rich tree nuts to make bio-diesel will be the two main technologies, and which w.

Separation of unsaturated fatty acid methyl esters from waste oils biodiesel using urea adduction fractionation;

Polymerization of waste oils fatty acid methyl esters to prepare dimer acid methyl esters

The resources and status of utilizing and property of waste oils are expounded.

Exploiting geothermal energy from the abandoned well;