METHOD OF RECYCLING GLYCERINE-CONTAINING BY-PRODUCT OF PRODUCING BIODIESEL FUEL Russian patent published in 2013 - IPC C07C67/03 C07C69/30 C08K5/103 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of recycling a glycerine-containing by-product of producing biodiesel fuel from renewable plant material containing more than 70% glycerine. The present task is solved by that, after distilling residual methanol, the glycerine-containing product is esterified by 3-10 fold molar excess of C4-C6 monobasic carboxylic acids in the presence of 0.5-1.5 wt % acid catalyst, at temperature of 90-120°C, using azeotrope-forming agents for 8-10 hours, which are needed to obtain triglycerides of C4-C6 carboxylic acids with output of 90%, which, after vacuum distillation, are a quality end product - plasticiser for PVC compositions. The obtained product is transparent, has no smell and has hazard class 4.

EFFECT: obtained product matches domestic and foreign plasticiser samples used in producing linoleum on basic characteristics.

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