A kind of synthetic dibutyl carbonate catalyst and its preparation method and application

Abstract

The invention provides a synthetic dibutyl carbonate catalyst, and a preparation method and an application thereof, belonging to the technical field of catalyst preparation. The synthetic dibutyl carbonate catalyst comprises components of ZnO, NiO, alkaline earth metal oxide, alkali metal oxide and a carrier with a weight ratio of 100: (3-60): (0.1-40): (0.1-10): (2-50). The preparation method for the synthetic dibutyl carbonate catalyst comprises the following steps: 1) filter cake preparation; 2) catalyst slurry preparation; and 3) catalyst molding. The synthetic dibutyl carbonate catalyst provided by the invention has high catalytic activity, long service life and high mechanical strength; the preparation method for the synthetic dibutyl carbonate catalyst is simple, convenient and practicable, and is applicable to large-scale industrial production; and the synthetic dibutyl carbonate catalyst is applicable to a reaction of n-butyl alcohol and urea for preparation of dibutyl carbonate.

Description

technical field [0001] The invention relates to a catalyst for synthesizing dibutyl carbonate, a preparation method and an application thereof, and belongs to the technical field of catalyst preparation. Background technique [0002] Dibutyl carbonate is a long carbon chain organic synthesis intermediate, which can be used to synthesize diphenyl carbonate, and then synthesize polycarbonate. It can also be used as a matrix material for lubricating oil, used in metal degreasing, leather treatment and other industries , a lot of uses. The synthesis methods of dibutyl carbonate mainly include phosgene method, urea alcoholysis method, oxidative carbonylation method and transesterification method. The phosgene method has disadvantages such as highly toxic raw materials, long operation period, and serious equipment corrosion by by-products, and is being phased out gradually. The oxidative carbonylation method generally uses palladium and other noble metals and their compounds as ...

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Problems solved by technology

However, the applicant has found that the existing urea alcoholysis method needs a higher butanol and urea molar ratio.

[0004] CN102093221A discloses a method for synthesizing dibutyl carbonate, using butyl carbamate and n-butanol as raw materials, using MgO as a catalyst, CO2 as a reaction accelerator and ammonia absorbent, and the conversion rate of butyl carbamate reaches 99% , but there is a problem that the price of the raw material butyl carbamate is higher than that of the product dimethyl carbonate

Deng Youquan et al. (CN102557948A, CN102464588A) adopted a reaction separation system consisting of a tank reactor and a gas storage-condensation-carbamate amine trap, and adopted a two-stage heating method to control the reaction temperature to obtain a higher yield of dibutyl carbonate. But still there is complex technology and need higher butanol, the problem of urea mol ratio, generate 1mol dibutyl carbonate needs 2mol n-butanol and 1mol urea according to stoichiometric coefficient reaction, actual n-butanol is far excessive, the excess n-butanol Adding to increase the energy consumption of the system will also increase the load of the separation system