The present invention relates to the technical fields of
forest product deepening and
processing, and
renewable energy resources, and a method for preparing
rosin methyl ester and a compound
biodiesel raw material through pine
oleoresin. The method comprises: mixing the pine
oleoresin and
turpentine oil according to a
mass ratio of the pine
oleoresin to the
turpentine oil of 1:0.4-1.2; heating, melting and filtering; adding the resulting filtrate and
methanol to an
autoclave according to the
mass ratio of the filtrate to the
methanol of 1:0.05-0.5, introducing 0-4 MPa of CO2 to the
autoclave, wherein the CO2 is adopted as a cosolven to carry out a reaction under a supercritical state or a subcritical state; carrying out standing and demixing for the product after completing the reaction, wherein the upper layer is an
alcohol phase, and is subjected to atmospheric
distillation to recover the
methanol, the lower layer is an
oil phase, is subjected to atmospheric
distillation to recover the methanol, and then is subjected to a CO2 circulating gas introducing method or a super heating steam method to carry out
vacuum distillation and separation to obtain the
rosin methyl ester and the compound
biodiesel raw material. The method provided by the present invention has advantages of simple production process,
environmentally friendly property, no requirement of the catalysts, improvement of the
economic feasibility of the
biodiesel preparing through the pine oleoresin, and the like.