Method for preparing rosin methyl ester and compound biodiesel raw material through pine oleoresin

Abstract

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.

Description

technical field [0001] The invention relates to the technical fields of deep processing of forest products and renewable energy, and relates to a method for preparing rosin methyl ester and compound biodiesel raw materials from rosin. Background technique [0002] Biodiesel is a liquid fuel made from various oils and low-carbon alcohols through esterification or transesterification. It is a high-quality substitute for petrochemical diesel and a typical "green energy" . With the increasing oil crisis worldwide and in view of the pressure on resources and the environment, people have begun to seek new technologies for preparing fuels that do not use petroleum as a raw material. Among them, vegetable oil was once the main raw material for preparing biodiesel. Research. Patent announcements CN1313568 and CN1570029 disclose the process and method of using natural vegetable oils to prepare biodiesel. However, because the price of natural oils is generally 10-20% higher than that...

AI Technical Summary

Problems solved by technology

This method has created a unique way of producing fuel oil from rosin, a biomass, and has made beneficial contributions to society. However, this method is to obtain rosin and turpentine products by distillation and separation of rosin, and then use rosin as a raw material for decarboxylation of rosin resin acid. Obtain abietane and carbon dioxide, the price of rosin used is higher than that of rosin, and the decarboxylation of rosin resin acid into carbon dioxide not only causes the atomic loss of raw material rosin, but also generates carbon dioxide, a greenhouse gas, and the reaction of this method requires the addition of a catalyst, and the reaction time is long , product separation is difficult, serious environmental pollution