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 for preparing n-propanol by gas-phase hydrogenation of propionaldehyde using a copper-zinc catalyst in the field of chemical industry. Background technique [0002] At present, there are three methods for industrially producing n-propanol in the world: one is oxo-synthesis of ethylene, carbon monoxide and hydrogen to obtain propionaldehyde, and then hydrogenation to obtain n-propanol. The second is that ethylene and water use metal hydrocarbonyl compounds as catalysts to directly generate n-propanol. The third is to use propane or butane as raw material, and it is obtained by liquid phase oxidation. In the first method, ethylene, carbon monoxide and hydrogen are carbonylated to obtain propionaldehyde, and then hydrogenated to obtain n-propanol. Most of the catalysts used in industry are cobalt-based catalysts and nickel-based catalysts. When cobalt-based catalysts are selected, the operating condition...

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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