Preparation method of solid acid esterification catalyst

Abstract

The invention provides a preparation method of a solid acid esterification catalyst, relating to a catalyst. The preparation method has the following beneficial effects: the activity of a solid acid catalyst can be remarkably improved, and especially, the catalytic activity of the catalyst reaches or approaches liquid acid level when the catalyst is used for catalyzing esterification reaction of higher fatty acid. The preparation method comprises the following steps: simultaneously dropwise adding zirconium salt solution used as a raw material and ammonia water serving as a precipitator and stirring the two substances to ensure the pH value to be 8-10 to generate zirconium hydroxide precipitate; aging and then drying the zirconium hydroxide precipitate; soaking the dried zirconium hydroxide in sulfuric acid solution to obtain a solid acid esterification catalyst precursor; and drying and then calcining the solid acid esterification catalyst precursor to obtain the SO4<2-> / ZrO2 solid acid esterification catalyst. By using the preparation method, the following defects are overcome: the esterification reaction catalysts in the prior art pollute environment, have high cost and low catalyst activity and can not participate in the esterification reaction of the higher fatty acid.

Description

technical field [0001] The invention relates to a catalyst, in particular to a preparation method of a solid esterification catalyst. Background technique [0002] Organic esters are widely used in organic synthesis industries such as solvents, plasticizers, resins, coatings, flavors and fragrances, cosmetics, medicines, and surfactants. Esterification is an important part of chemical production, an important way to synthesize raw materials and intermediates, and the main source of many daily and production supplies. The esterification reaction generally uses an acid catalyst. With the development of society, human beings have higher and higher requirements for the environment. Traditional liquid acid catalysts are easy to corrode equipment, produce a large amount of industrial wastewater, and easily cause damage to the environment. Therefore, they are gradually being replaced by environmentally friendly solid acid catalysts. replaced. [0003] In 1979, Makoto Hino and Ka...

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Problems solved by technology

If the pH value is too low, it will affect the activity of the catalyst, or even basically no acidity, and it will not be able to catalyze the esterification reaction

The classic precipitation and impregnation method to prepare SO 4 2- / ZrO 2 In the case of solid acid, the method of adding concentrated ammonia water to the zirconium salt solution is generally adopted. During the precipitation process, a gradient change in pH value will occur, making the resulting precipitation uneven, and ultimately resulting in low catalytic activity of the solid acid.

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