Method for preparing anhydrous formaldehyde by dehydrogenation of absolute methanol

Abstract

The patent of the invention belongs to the technical field of chemical industry, and specifically relates to the preparation and application of a catalyst for preparing anhydrous formaldehyde by direct dehydrogenation of anhydrous methanol. The catalyst uses one or both of copper and zinc oxide as the active ingredient, the corresponding metal salt as the precursor, sodium carbonate, etc. as the precipitating agent, and the sample is prepared by the deposition precipitation method, and then filtered, washed, dried and The catalyst is finally prepared by roasting and other processes. The catalyst prepared by the method shows high activity, selectivity and stability in the process of catalyzing the dehydrogenation of anhydrous methanol to produce anhydrous formaldehyde. At a temperature of 400-600°C, nitrogen is used as a carrier gas, the feed ratio of methanol is in the range of 1-40 vol%, the conversion rate of methanol is 10-90%, and the selectivity of formaldehyde is as high as 60-99%. The preparation process of the catalyst is simple, the cost is low, the catalytic effect is good and the stability is high, and the catalyst has potential industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to the preparation and application of a catalyst for preparing anhydrous formaldehyde by direct dehydrogenation of anhydrous methanol. Background technique [0002] As the simplest aldehyde, formaldehyde is an important organic chemical raw material, widely used in organic synthesis, synthetic materials, coatings and other industries to produce pentaerythritol, paraformaldehyde, phenolic resin, urea-formaldehyde resin, amino resin, etc. . In recent years, with the continuous expansion of people's demand for engineering plastics, dyes and urotropine drugs with excellent performance, the demand for anhydrous formaldehyde has also increased significantly. However, at present, industrially, formaldehyde is mainly prepared by oxidation of methanol, and the obtained formaldehyde contains a large amount of water. In addition, formaldehyde and water easily form azeot...

AI Technical Summary

Problems solved by technology

There are low selectivity of formaldehyde in the above route, poor stability of the catalyst, high reaction temperature and problems such as the use of precious metals