Catalyst for synthesizing ethylene glycol by oxalate hydrogenation, and preparation method and application method of catalyst

Abstract

The invention provides a catalyst for synthesizing ethylene glycol by oxalate hydrogenation, and a preparation method and an application method of the catalyst. The preparation method comprises the steps of taking copper nitrate and copper acetate as copper sources, taking alkaline silica gel as a silicon source, and taking urea and ammonia water as a precipitant; adding a multi-hydroxyl organic matter; and preparing a Cu / SiO2 catalyst with a deposition-precipitation method. According to the method, the dimension and dispersity of copper species are adjusted and controlled by adding the multi-hydroxyl organic matter in the preparation process, and the aggregation of the copper species is inhibited by utilizing carbon deposition, so that the problem of easy sintering of the copper species at a high temperature is better solved. The application method for applying the catalyst to the synthesis of ethylene glycol by oxalate hydrogenation comprises the steps of firstly enabling the organic matter on the catalyst to form the carbon deposition at a relatively high temperature in an inert atmosphere; secondly switching inert gas to hydrogen in a cooling process after carbon deposition formation; and finally when the temperature is reduced to a reaction temperature, performing subsequent hydrogenation synthesis. The method has the characteristics that the catalyst does not need to be pre-roasted before use, and hydrogen pre-reduction does not need to be carried out for a long time, so that the preparation and use costs of the catalyst can be reduced.

Description

technical field [0001] The invention relates to the preparation of a catalyst for synthesizing ethylene glycol through the hydrogenation of lower oxalate. In particular, it relates to a preparation method of a catalyst for hydrogenation of dimethyl oxalate to synthesize ethylene glycol. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material, which can be used in the production of polyester fibers, plastics, rubber, antifreeze, unsaturated polyester resins, lubricants and explosives, and has a wide range of uses. At present, the main method of industrial synthesis of ethylene glycol is the traditional petroleum route, that is, the oxidation of ethylene to ethylene oxide (EO), and then the hydration of ethylene oxide to ethylene glycol. Syngas hydrogenation of oxalate to ethylene glycol is an emerging route for the synthesis of bulk chemicals by non-petroleum routes. Glycols, especially synthesis gas hydrogenation of oxalate to ethyl...

AI Technical Summary

Problems solved by technology

However, in practical applications, too high hydrogen-ester ratio also requires high performance of the circulating compressor, which will greatly increase the production cost.

[0005] At present, the research on the modification of additives has achieved certain results, and indeed the performance of catalyst hydrogenation has been greatly improved, but no breakthrough has been achieved.

Images