Process for preparing n-propanol by hydrogenation of propionaldehyde with cu-zn catalyst

Abstract

The invention provides a production technique for preparing n-propanol with the hydrogenated propionaldehyde under the Cu-Zn catalyst, which is characterized in that the propionaldehyde is hydrogenated in the gas phase under the action of the Cu-Zn catalyst to generate the crude propanol; then the light components and the heavy components are removed when the crude propanol is entering a distillation system to obtain the product of n-propanol; and the Cu-Zn catalyst mainly comprises 29.4% to 50% copper oxide and 49.4% to 70% zinc oxide by weight. The preparation method for n-propanol with the hydrogenated propionaldehyde under the Cu-Zn catalyst has the advantages of adoption of the Cu-Zn catalyst, less side reaction, large production capacity, good hydrogenation selectivity, high purity of the produced product with the content of n-propanol up to more than 99.7%, low cost and price, simple technique and easy operation.

Description

Technical field [0001] The invention relates to a new production process in the field of chemical industry that utilizes a copper-zinc catalyst to prepare n-propanol through gas phase hydrogenation of propionaldehyde. Background technique [0002] Currently, there are three methods for industrially producing n-propanol globally: one is oxo synthesis of ethylene with carbon monoxide and hydrogen to obtain propionaldehyde, and then hydrogenation to obtain n-propanol. Second, ethylene and water use metal hydrogen carbonyl compounds as catalysts to directly generate n-propanol. The third one is produced by liquid phase oxidation using propane or butane as raw material. In the first method, ethylene is oxo-synthesized with carbon monoxide and hydrogen to obtain propionaldehyde, which is then hydrogenated to obtain n-propanol. Most of the catalysts used in industry are cobalt-based catalysts and nickel-based catalysts. When using cobalt-based catalysts, the operating conditions ...

AI Technical Summary

Problems solved by technology

When cobalt-based catalysts are selected, the operating conditions are carried out under high pressure, and cobalt removal must be carried out in the cobalt removal system after the reaction. Cobalt-based catalysts are easy to deactivate and are expensive

When nickel-based catalysts are selected, the operating conditions are liquid-phase hydrogenation, which can hydrogenate aldehydes at relatively low temperatures (0-160°C), but there is a side reaction of reduction to hydrocarbons, which is difficult to control

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