Dimethyl maleate hydrogenation reaction catalyst as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of chemical products, and particularly relates to a dimethyl maleate hydrogenation reaction catalyst as well as a preparation method and an application thereof. The catalyst comprises the following elements in percentage by mole: 30 to 40 percent of Cu, 20 to 30 percent of Mn, 10 to 20 percent of Al, 10 to 20 percent of Zn, 0 to 5 percent of Ag and 0 to 5 percent of Ru. The Al element, the Ag element and the Ru element are added into the catalyst, so that dispersion and modification of active components in the catalyst are realized, the total selectivity of BDO and gamma-butyrolactone can reach 93%, the cost can be effectively reduced, and the catalyst is green and environment-friendly. According to the present invention, with the catalyst, the 1, 4-butanediol and / or gamma-butyrolactone can be prepared with high selectivity by changing the reaction conditions during the 1, 4-butanediol preparation process through the dimethyl maleate hydrogenation reaction catalyst; the preparation method of the catalyst is simple and low in cost, and the prepared catalyst is environmentally friendly and has long service life.

Description

technical field [0001] The invention belongs to the technical field of chemical products, and in particular relates to a dimethyl maleate hydrogenation reaction catalyst and its preparation method and application. The hydrogenation reaction catalyst has high selectivity and can be used to synthesize BDO or gamma - Butyrolactone. Background technique [0002] 1,4-Butanediol, also known as BDO, has many downstream derivatives. It is not only widely used in the production of solvents, medicines, cosmetics, plasticizers, curing agents, pesticides, etc., but also can be used to prepare tetrahydrofuran, poly Chemical preparations such as butanediol phthalate, γ-butyrolactone, and N-methylpyrrolidone are important chemical raw materials. [0003] At present, the synthesis methods of 1,4-butanediol mainly include: alkyne aldehyde method (Reppe method), maleic anhydride (maleic anhydride) method, propylene method, butadiene method, etc. The maleic anhydride synthesis route is to hy...

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Problems solved by technology

[0007] As another example, the patent CN1356168A discloses a catalyst for gas-phase hydrogenation of dimethyl maleate to produce 1,4-butanediol for co-production of tetrahydrofuran. By selecting copper, manganese, aluminum, and nickel as the main elements of the catalyst, In the reaction of catalyzing the preparation of 1,4-butanediol, the selectivity to 1,4-butanediol is up to more than 80%, but since THF is co-produced in this method, the Diol selectivity is not high

[0008] In summary, it can be seen that in the existing dialkyl maleate gas-phase hydrogenation catalytic process, three main products of BDO, gamma-butyrolactone and tetrahydrofuran are mostly produced simultaneously, but, due to the dialkyl maleate Among the products of gas-phase hydrogenation catalytic reaction, the economic value of BDO and γ-butyrolactone is high, and the value of the by-product tetrahydrofuran is not high. Therefore, such a gas-phase hydrogenation catalytic process is not only poor in selectivity, but also easy to produce Too much by-product tetrahydrofuran, resulting in wasted capacity

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