Method for preparing methyl oleate from vegetable oil under catalysis of silicon dioxide-supported heteropolyacid

Abstract

The invention discloses a method for preparing methyl oleate from vegetable oil under catalysis of silicon dioxide-supported heteropolyacid, which belongs to the technical field of fine chemical synthesis. In the invention, silicon dioxide is used as a solid phase carrier to support phosphotungstic acid to catalyze the reaction of the vegetable oil and methanol, and soybean oil, palm oil, colleseed oil, peanut oil, cottonseed oil and other vegetable oil are used as raw materials to be reacted with methanol to form methyl oleate. Compared with the conventional method using strong acid, strong alkali and the like as a catalyst, the reaction can be performed under normal pressure, acid-resistance and alkali-resistance equipment are not needed, the reaction conditions are mild, waste water, waste liquid and waste gas pollutants are not emitted, the silicon dioxide-supported heteropolyacid catalyst can be recycled and reused, and the method meets energy-conservation and environment-protection requirements.

Description

technical field [0001] The present invention relates to a new catalyst for transesterification reaction, in particular to a novel method for preparing methyl oleate through transesterification technology using silicon dioxide solid-carried phosphotungstic heteropolyacid as a catalyst and soybean oil and other vegetable oils as raw materials. method. Background technique [0002] The industrial preparation of methyl oleate generally uses oleic acid and methanol as raw materials, and liquid acid is used as a catalyst to obtain it through esterification reaction. In the reaction, not only strong acid catalysts such as sulfuric acid and sulfamic acid are needed, but the reaction temperature is high and the reaction time is high. There are many by-products, and corrosion-resistant equipment is required. After the reaction is completed, it is necessary to use strong alkali to neutralize the acid in the product, and to use dehydration and desalination equipment to post-process the ...

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Problems solved by technology

[0003] Methyl oleate can also be used as biodiesel in industry, so the demand has gradually increased in recent years. Using soybean oil and other vegetable oils as raw materials to prepare methyl oleate is the main means of producing biodiesel in the industry at present, that is, using Oleic acid and triolein in vegetable oil react with methanol under the action of acid, alkali and other catalysts to obtain fatty acid methyl ester and glycerin. Although this reaction has high catalytic efficiency, it still needs to use strong acid or strong base as the catalyst. Catalyst, after the reaction is completed, complex post-treatment processes such as neutralization, water removal, and desalination are required, so the process is relatively complicated, the energy consumption is high, the amount of methanol is large, the color of the product is dark, there are many impurities, and the catalyst is separated from the product Difficult, with a large amount of waste water, waste liquid, waste gas and other three wastes discharged, the pollution to the environment is great