BIOFUEL OBTAINING METHOD Russian patent published in 2012 - IPC C10L5/42 C11C3/10 

FIELD: oil and gas industry.

SUBSTANCE: method involves preparation of raw material, stage-by-stage treatment and obtaining of fuel. Preparation of raw material is performed by means of refining. Treatment is performed at three stages. At the first stage fish oil is mixed with absolute ethanol or methanol in ratio of 1:2-1:5. At the second stage concentrated sulphuric acid in quantity of 2-10% is added to the obtained mixture and ester interchange reaction is performed at temperature of not more than 40°C during 20-60 min. At the third stage the mixture temperature is brought to boiling temperature and kept at this temperature during 60-480 min with separation into glycerin and mixture of ethyl or methyl ethers of fatty acids. Then, mixture is neutralised with alkali liquor, washed with water and settled. After that, impurities are removed by centrifuging so that fuel is obtained, which is then dehydrated and cleaned.

EFFECT: improving physical and chemical properties.

3 cl, 1 tbl, 5 ex