Esterified weak acid catalyst for synthesizing 2,2,4-trimethylpentanediol diisobutyrate

Abstract

The invention discloses an esterified weak acid catalyst for synthesizing 2,2,4-trimethyl-1,3-pentanediol diisobutyrate and a preparation method thereof. The weakly acidic solid catalyst is prepared by compounding modified attapulgite and ammonium vanadate. The method disclosed by the invention is simple in catalyst preparation process and low in cost, the catalyst has the advantages of being highin activity and selectivity, easily recyclable, reusable and the like, the defects that the equipment corrosion is serious and the amount of product impurities is large when concentrated sulfuric acid and super-strong solid acid are used as the catalyst, lots of waste liquor is produced, the environment is polluted and the like are overcome, and the industrial prospects are excellent.

Description

technical field [0001] The invention relates to the technical field of industrial catalysts, in particular to a 2,2,4-trimethyl-1,3-pentanediol diisobutyrate esterification catalyst and a preparation method thereof. technical background [0002] Organic esters are widely used in organic synthesis industries such as solvents, plasticizers, resins, coatings, 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. As human beings have higher and higher requirements on the environment, traditional liquid acid catalysts are gradually replaced by environmentally friendly catalysts due to their shortcomings such as easy corrosion of equipment, large amounts of industrial wastewater, and serious damage to the environment. [0003] Hino and others ...

AI Technical Summary

Problems solved by technology

However, the solid superacid is strong in acidity, has the disadvantages of corrosion to equipment and many by-products of esterification reaction, and its application is difficult to industrialize.

As described in CN 1759933A, the solid acid catalyst prepared by methods such as macroporous finished silica gel through hole expansion, precipitation, and neutralization is used for esterification with poor activity and selectivity, and the preparation process is complicated.

CN 101703940 A describes the preparation of a kind of SO by hydrothermal method 4 2- / TiO 2 -SiO 2 Solid acid, using organic titanium ester and organic silicone grease as raw materials, difficult subsequent treatment, and the conversion rate and selectivity of the esterification reaction are not high

Catalyst preparation costs are high, so it is difficult to industrialize

CN 102259008 A describes the preparation of a solid acid catalyst by a solventless dry grinding method, which uses grinding zirconia and ammonium sulfate. The method for preparing a solid acid catalyst is simple, but the solid acid has poor dispersibility, poor stability, uneven dispersion and poor effect of esterification reaction

[0004] In order to solve the above problems, the present invention adopts modified attapulgite composite vanadium material to prepare weakly acidic solid catalyst to solve the conversion rate and selectivity of the esterification reaction of dodecyl alcohol ester and isobutyric acid

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