The invention discloses a method for preparing a low temperature
epoxy fatty acid branched-chain
alcohol ester improver for
biodiesel and application thereof. The method comprises the steps of taking natural oil and branched-chain
alcohol as raw materials to react in the presence of a catalyst, and carrying out distilling, standing and layering on the product to obtain supernatant
fatty acid branched-chain
alcohol ester; and then mixing the
fatty acid branched-chain alcohol ester with
formic acid, adding an epoxidation catalyst, reacting while dropwise adding
hydrogen peroxide, and carrying out standing, layering, neutralizing and
dewatering on the product to obtain
epoxy fatty acid branched-chain alcohol ester. The invention develops an
epoxy fatty acid branched-chain alcohol ester improver aiming at the characteristics of
biodiesel. The method has the following beneficial effects: by branching bonds of
fatty acid ester and introducing a polar group onto the interior
double bond structure of the
fatty acid ester, the improver can be easily mixed with the
biodiesel to form uniform solution, thus being beneficial to blocking further growth of
solid crystals; and after different oil-based biodiesels and the improver are mixed, the low temperature fluidity of the biodiesels can be obviously improved, the
condensation point and cold filter point can be reduced by 5-15 DEG C, the calorific value can be improved, and the
viscosity can be reduced.