A novel acetylenylation catalyst for synthesizing 1,4-butynediol and its preparation method

Abstract

The invention specifically relates to a novel ethynylation catalyst for synthesizing 1,4-butynediol and a preparation method of the novel ethynylation catalyst. The ethynylation catalyst is of a homogeneous cupric silicate structure and is doped with trace Bi2O3 and MgO, particle size distribution is as follows: particles with particle size smaller than or equal to 12 mu m account for 10%, particles with particle size of 12-35 mu m account for 80%, and particles with particle size larger than or equal to 35 mu m account for 10%; tamping stacking density of the ethynylation catalyst is 2.2-2.5kg / L. The preparation method of the catalyst mainly comprises steps as follows: soluble salt solutions of Cu, Bi and Mg and an aqueous solution of silicon source substances are dropwise added to an aqueous nitric acid solution under the stirring condition and subjected to a reaction, and a product is filtered and washed; precipitates are subjected to beating again, obtained slurry is subjected tohydro-thermal treatment and is filtered, dried and calcined, and the catalyst is prepared. The catalyst has the characteristics of being high in activity, selectivity and good in wear resistance, copper ion loss is low, generation of catalytic reaction polymers can be inhibited, the catalyst and the product are easy to separate, and the service life is remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of synthesis of 1,4-butynediol, and in particular relates to a novel acetylenization catalyst for synthesizing 1,4-butynediol and a preparation method thereof. Background technique [0002] The catalysts used to produce 1,4-butynediol by the alkyne aldehyde method are mainly copper-bismuth catalysts, and copper-bismuth catalysts mainly include supported and unsupported catalysts. [0003] For CuO-Bi 2 o 3 The research on supported catalysts mainly focuses on the screening of supports. For example, US2232867, US4002694, US3920759, US3294849, etc. disclose their respective supported copper-based catalysts. Due to the existence of the carrier, this kind of catalyst can increase the dispersion degree of the active component and the wear resistance of the catalyst. But since the carrier is made of SiO 2 、Al 2 o 3 etc., there is a strong interaction between the active component Cu and the support, which make...

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Problems solved by technology

[0007] In order to solve the shortcomings of existing catalysts used in the synthesis of 1,4-butynediol, which have the disadvantages of copper ion loss and easy formation of polymers on the surface of the catalyst, the present invention provides a novel acetylenization catalyst for synthesizing 1,4-butynediol and Its preparation method, the acetylenization catalyst has the characteristics of high activity, high selectivity, good wear resistance, less loss of copper ions, can inhibit the formation of catalytic reaction polymer, and easy separation of catalyst and product

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