Hydrogenation catalyst and preparation method and application thereof

Abstract

The invention discloses a catalyst for preparing trimethylolpropane through hydrogenation of 2,2-dimethylolbutyraldehyde and a preparation method of the catalyst. The catalyst comprises 35 to 70 wt% of copper oxide, 5 to 25 wt% of zinc oxide, 5 to 35 wt% of aluminum oxide, 10 to 30 wt% of silicon dioxide, 0.5 to 5 wt% of alkaline earth metal oxide, 0.05 to 1.0 wt% of palladium oxide, 0.01 to 1.0 wt% of iridium oxide and 0.01 to 1.0 wt% of tin oxide. When the catalyst is used for preparing trimethylolpropane by a hydrogenation method, the catalyst not only has good activity and selectivity, butalso has strong formate conversion capability and high mechanical stability.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a hydrogenation catalyst and its preparation method and application, in particular to a catalyst for preparing trimethylolpropane by hydrogenation of 2,2-dimethylolbutyraldehyde and the preparation method thereof. Background technique [0002] Trimethylolpropane (TMP for short), also known as trimethylolpropane and 2,2-dimethylolbutanol, is mainly used in the synthesis of high-grade alkyd resins and polyurethane coatings, and can also be used in the synthesis of plasticizers, aviation lubricants, Surfactants, wetting agents, textile auxiliaries, printing inks and a variety of fine chemicals, etc., have broad market prospects. [0003] At present, there are two main methods for preparing trimethylolpropane: disproportionation method and catalytic hydrogenation method. The disproportionation method is that 2,2-dimethylolbutyraldehyde (DMB) generated from formaldehyde and n-butyral...

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Problems solved by technology

[0010] CN1260193C discloses a method for decomposing ammonium formate in a reaction mixture containing polyhydric alcohols. The hydrogenation liquid decomposes ammonium formate by heating up in another reactor under the action of a catalyst such as Co / Cu / Ni. The reaction temperature is as high as 180° C., increasing Reduced equipment investment and operating costs

[0013] At present, when the catalyst prepared by the prior art is used for the hydrogenation of 2,2-dimethylolbutyraldehyde to prepare trimethylolpropane, there is insufficient hydrogenation ability of 2,2-dimethylolbutyraldehyde, 2,2 -Dimethylolbutyraldehyde is easy to decompose on the catalyst, resulting in poor selectivity, poor formate conversion ability of the catalyst, resulting in low product quality, and easy pulverization of the catalyst, etc.

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