Method for synthesizing biodiesel through efficient catalysis of castor oil and ester exchange

Abstract

The invention discloses a method for synthesizing biodiesel through efficient catalysis of castor oil and ester exchange. The method comprises the following steps of adding the castor oil and hot water in a treatment tank, standing for layering, taking upper-layer grease and then carrying out centrifugal separation; adding a treating agent prepared from polyacrylamide and activated clay in the grease to treat to obtain pure castor oil; adding the pure castor oil, methyl alcohol and a catalyst in a reaction kettle to perform esterification, centrifuging, and standing for layering, wherein the upper layer is a biodiesel crude product, and the catalyst is prepared from tetra(p-carboxyphenyl)metalloporphyrin and aluminum oxide; adding the biodiesel crude product, methylethanolamine and ethyl alcohol in a rectifying tower, rectifying to perform deacidifying treatment, then adding a pour point depressant and a surface active agent, and mixing uniformly at a high speed to obtain a biodiesel product. The biodiesel prepared by the method has the advantages of low condensation point, low acid value, high flash point, good stability, light color, high purity, high cetane value, high burning efficiency, wide raw material sources, low cost and like, the industrial production is easy to achieve, and the market prospect is broad.

Description

technical field [0001] The invention belongs to the technical field of biodiesel, in particular to a method for efficiently catalyzing castor oil transesterification to synthesize biodiesel. Background technique [0002] With the rapid development of our country's economy, the massive burning of fossil fuels has caused serious impacts on the environment and people's lives. Limited fossil energy and increasingly serious environmental problems make people urgently need a sustainable green energy. Biodiesel refers to oil crops such as soybeans, rapeseed, cotton, palm, etc., wild oil plants and engineering microalgae and other aquatic vegetable oils, animal fats, and catering waste oils, etc. Renewable diesel fuel to replace petrodiesel. Biodiesel has many advantages. First of all, it has a wide range of raw materials and low price, and it is a renewable energy source; secondly, biodiesel is non-toxic, low in sulfur content, green and environmentally friendly, and is of great ...

AI Technical Summary

Problems solved by technology

Castor oil generally uses strong base or strong acid as a catalyst to prepare biodiesel. The traditional strong base and strong acid catalyzed preparation of biodiesel mostly has low catalytic efficiency, low output, deep color, easy deterioration, long reaction time, corrosion equipment, complex process, and reaction. Disadvantages such as high temperature, high energy consumption, easy to cause secondary pollution and by-product loss, and high cost

[0004] Although most of the properties of biodiesel can meet the fuel requirements, its poor low temperature fluidity is still a key factor that seriously restricts the use and promotion of biodiesel.

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