Method for preparing catalyst for catalytic dehydrogenation of alcohol amine

Abstract

The invention relates to a method for preparing a catalyst for the catalytic dehydrogenation of alcohol amine. Based on skeletal copper, the method comprises the following processes of soakage, chemical deposition, nano-reduction of a modified metal, aging, catalytic activation, regeneration and the like; by uniformly depositing modified materials of palladium, nickel and the like on the surface of the skeletal copper, the method further prolongs the service life of the catalyst on the basis of improving the activation of the catalyst. Compared with the prior method, the catalyst prepared by the method has the characteristics of long catalyst life, high catalytic efficiency, single product, easy industrialization, and extremely good application prospect.

Description

【Technical field】 [0001] The invention relates to a catalyst for catalytic dehydrogenation of alcohol amines and a preparation technology thereof, wherein alcohol amines refer to amino alcohol compounds directly synthesized by using ethylene oxide, propylene oxide, etc., liquid ammonia, organic amines, etc. The dehydrogenation is catalyzed by the catalyst, so that the original alcohol hydroxyl group is converted into carbonyl and carboxyl compounds. 【Background technique】 [0002] Amino acid and aminoacetone series products are widely used in water treatment reagents, electroplating, dyes, and fine chemical intermediates. There are many production methods, such as the preparation of glycine by the chloroacetic acid method, the chloroacetic acid method, the hydrazine hydrate method and hydrogen cyanide. Preparation of iminoacetic acid by acid method. These methods have high cost of raw materials, or complicated process, or low yield, or pollute the environment. The industri...

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Problems solved by technology

[0006] Similarly, Spanish patent ES2022044 and Japanese patent JP83185179 also pointed out that copper, as the main body of dehydrogenation catalysis of alcohol amine compounds, has high catalytic activity, but copper catalyst is used in a large amount, is easy to deactivate, and is difficult to industrialize the technical bottleneck

[0007] U.S. Patent US4782183 introduces a catalytic dehydrogenation technology of active catalysts under anaerobic conditions. This patent provides a series of novel copper-containing catalyst synthesis technologies. The catalyst has specific selectivity and a considerable number of repeated uses; however, This technology has long-term use of this series of catalysts, and the reaction by-products-oxalic acid compounds increase significantly. These compounds are similar in properties to the target product and are difficult to separate, which increases post-processing equipment and operating costs.

[0008] U.S. Patent US6159894 provides a preparation technology of copper and zirconium co-precipitation catalyst, which utilizes the protonic and anti-aging properties of zirconium metal under alkaline conditions to stabilize the service life of the catalyst; practice shows that the anti-aging performance of the catalyst produced by this technology The catalytic activity has been significantly improved, but the specificity of product conversion is still not ideal

[0009] U.S. Patent US5292936 and U.S. Patent US5739390 invented the use of modified Raney Cu catalytic system instead of ordinary Raney Cu technology. The modified catalyst contains elements such as zirconium, zinc, vanadium, molybdenum, nickel, germanium, tin, lead, etc., and the amount of catalyst is reduced. The catalytic life has been improved to a certain extent, and the catalytic activity is not significantly reduced by repeated use of this type of catalyst; however, generally speaking, there are still technical problems such as a large amount of catalyst used and a short service life of the catalyst.

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