METHOD OF OBTAINING BIODIESEL FUEL Russian patent published in 2015 - IPC C10L1/02 B82B1/00 C11C3/10 C07C67/02 C07C67/56 

FIELD: chemistry.

SUBSTANCE: method of obtaining biodiesel fuel includes preparation of vegetable oil with heating to temperature 80°C, carrying out alkaline ethanolysis by means of potassium hydroxide with obtaining ether-glycerol mixture, which is separated with obtaining two fractions of glycerol and mixture of ethers, mixture of ethers is subjected to filtration, sorption purification and dehydration, obtained biodiesel fuel is stored. Filtration, sorption purification and dehydration are performed in two stages, at the first stage mixture of ethers is placed into centrifuge, rotated at angular velocity 0.5-0.7 rev/min for 0.5-0.6 hour, with mixture being separated into light and heavy fractions, heavy fraction is drained, at the second stage light fraction is placed into another centrifuge, charge, consisting in wt % of carbon nanomaterial "Taunit" - 1-1.5% and natural bentonite material - the remaining part, is added into it with volume ratio 1:10, centrifuge is rotated at angular velocity 1.1-1.3 rev/min for 1.0-1.2 hour, with removal of heavy fraction remains.

EFFECT: application of two-stage filtration of mixture of ethers with charge makes it possible to increase quality of biodiesel fuel, output, prolong resource of engine operation with reduction of harmful emissions into atmosphere and economical consumption of fuel resources.

1 ex