Method for efficiently and environmentally friendly preparing dibutyl itaconate on basis of heterogeneous catalysis

Abstract

The invention discloses a method for efficiently preparing dibutyl itaconate on the basis of heterogeneous catalysis. Particularly, an efficient solid acid catalyst is adopted, itaconic acid and n-butanol are catalyzed heterogeneously to react without a water-carrying agent to generate the dibutyl itaconate under the conditions that the reaction temperature is 100-140 DEG C and the reaction time is 2-5 hours; and the solid acid catalyst hydrogenated macroporous strong acid type cation exchange resin. Compared with a traditional proton acid catalysis method, the method has the characteristics that 1, the catalytic efficiency is high, the reaction time is short, and the energy consumption is low; 2, heterogeneous catalysis is carried out, a reaction product and a catalyst are easily separated, and aftertreatment is simple; 3, esterification reaction are gentle, and side reactions are less; and 4, after the catalyst is separated, the repeated utilization rate of the catalyst is high.

Description

technical field [0001] The invention relates to the field of organic synthesis, and furthermore, relates to a method for preparing di-n-butyl itaconate in an efficient and environment-friendly way based on heterogeneous catalysis. Background technique [0002] With the depletion of petrochemical resources, bio-based products have attracted more and more attention. As an important chemical raw material in modern industrial production, itaconic acid is favored because it can be obtained from biomass resources through biological fermentation, and its molecular structure contains unsaturated double bonds and active carboxyl groups. At present, domestic enterprises producing itaconic acid mainly include Qingdao Langyatai Group and Zhejiang Guoguang Biochemical Co., Ltd. Among them, Langyatai Group is the largest domestic production enterprise with an annual output of 30,000 tons. [0003] As the product of itaconate esterification reaction, itaconate is an important intermediate...

AI Technical Summary

Problems solved by technology

[0004] Itaconic acid di-n-butyl ester is usually obtained by the esterification reaction of itaconic acid and n-butanol under concentrated sulfuric acid as a catalyst, but due to the strong oxidation of concentrated sulfuric acid, there are many by-products of the reaction, And then cause the obtained product to have dark color and low purity. In addition, the concentrated sulfuric acid corrodes the equipment seriously, produces waste water, and pollutes the environment.

And in the existing process of preparing di-n-butyl itaconate, water-carrying agents such as benzene, toluene, xylene and cyclohexane will be added to promote the removal of water produced in the reaction process, thereby accelerating the forward reaction. To improve the conversion rate, but the commonly used water-carrying agents are toxic chemicals, which pollute the environment, and after post-treatment, some of them remain in the product, affecting the color and performance of the product