Preparation method of a catalyst for preparing neopentyl glycol by liquid-phase hydrogenation of hydroxypivalaldehyde

Abstract

The invention relates to a preparation method of a catalyst for hydroxypivalaldehyde liquid phase hydrogenation preparation of neopentylene glycol. The catalyst comprises 20-65wt% of copper oxide, 15-50wt% of alumina, 2-25wt% of zinc oxide, 0.1-5wt% of tin oxide, 0.5-25wt% of alkaline earth oxide and 0-20wt% of titanium oxide and / or zirconia. The compounds containing copper, aluminum, zinc, tin and alkaline earth metal are mixed to form a mixture aqueous solution according to a certain ratio, the solution and an alkaline precipitant are added into a nanometer oxide-containing dispersion liquid in parallel, the mixture undergoes a precipitation reaction, the reaction product is aged and filtered, and the filter residues are washed, dried, roasted and compressed to form a molded catalyst. The catalyst prepared by the method has high activity and good selectivity in hydroxypivalaldehyde liquid phase hydrogenation preparation of neopentylene glycol, can promote 1115 ester conversion, can effectively improve liquid-repellency, and has high catalyst intensity and good stability.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of a catalyst for preparing neopentyl glycol by liquid-phase hydrogenation of hydroxypivalaldehyde. Background technique [0002] Neopentyl glycol (NPG) is an important chemical intermediate, mainly used in the production of powder coatings, polyester resins, plasticizers, lubricating oil additives, water-soluble alkyd resins, etc., widely used in automobiles, textiles, medicine , coatings and petroleum and other fields; it can also be used for the selective separation of aromatics and cycloalkanes, and has a broad market prospect. [0003] At present, there are two methods for industrially producing neopentyl glycol: sodium formate method and catalytic hydrogenation method. The sodium formate method is that the hydroxypivalaldehyde (HPA) generated by formaldehyde and isobutyraldehyde undergoes a cross-Connizzaro reaction with formaldehyde unde...

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Problems solved by technology

The catalyst disclosed in CN102728370A is composed of copper-zinc-aluminum-titanium-zirconium-hafnium-rhenium, which has high conversion rate and selectivity, but the strength and mechanical stability of the catalyst are not mentioned in the patent

CN102302937A discloses a copper-zinc-aluminum-manganese catalyst used to catalyze the hydrogenation of HPA to prepare NPG. The catalyst has high activity and good stability. At the same time, it also has good hydrogenation ability for hydroxypivalate hydroxypivalate and can tolerate a small amount of Acetal reaction catalysts such as triethylamine, the strength and loading of the catalyst after the reaction are not mentioned in the patent

[0006] In the prior art, the copper-based catalysts used for hydrogenation reactions need to go through the process of storage, filling, heating reduction, reaction, etc. from preparation to use, and are affected by various internal or external forces. When they are used in liquid phase reactions , but also due to liquid immersion, swelling and other reasons, the actual use strength of the catalyst will be greatly reduced, resulting in the catalyst being easily broken and pulverized in the liquid phase hydrogenation system, causing reactor blockage, threatening the stable operation of industrial devices, and affecting the life of the catalyst

[0007] In the prior art, the conventional copper-based catalyst prepared by the precipitation method has poor liquid resistance, and the catalyst is easily broken and pulverized during operation in the reactor, which will greatly affect the stable operation of the device

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