METHOD OF AUTOCATALYTIC ETHRIFICATION OF FATTY ACIDS Russian patent published in 2015 - IPC C11C3/02 C11C3/10 C10L1/02 C11C3/06 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method of separating micronutrients from distillate of deodoriser, containing free fatty acids. method includes the following stages: (i) processing deodoriser distillate at etherification stage with glycerol, with said etherification stage being autocatalytic, obtaining initial material in form of acylglycerides and discharge of glycerol excess and formed water; (ii) transfer of initial material in form of acylglycerides, in which water content constitutes less than 1500 ppm, and content of free fatty acid constitutes less than 3 wt %, to stage of re-etherification and processing initial material in form of acylglycerides with methane with obtaining non-purified biodiesel product; and (iii) purification of non-purified biodiesel product at distillation stage, and separation of non-purified biodiesel product into three fractions: 1) methyl ethers of fatty acids, 2) enriched with micronutrients tocopherol-containing product and 3) light hydrocarbons, with deodoriser distillate before supply to etherification stage being (i) preliminarily heated to temperature in the interval from approximately 50 to approximately 90°C.

EFFECT: method solves problems of tocopherol and sterol loss and makes it possible to purify micronutrients to a higher degree.

14 cl, 3 dwg, 8 ex, 1 tbl