Environmentally-friendly method for preparing alkane alcohol through liquid phase hydrogenation

Abstract

The invention relates to a method for preparing an alkane alcohol, particularly to an environmentally-friendly method for preparing an alkane alcohol through liquid phase hydrogenation. According to the method, a carbonyl compound and hydrogen are used as raw materials, the bed layer of a fixed bed reactor is filled with a mesoporous framework metal hybrid catalyst and a cocatalyst, a reaction product is extracted from the fixed bed reactor, and a high-purity alkane alcohol is obtained by a two-stage rectifying tower through sequential cutting. According to the invention, the method has the obvious advantages of short flow, low energy consumption, low equipment investment, stability and reliability in operation control, low emission of three wastes and the like, and avoids the problems existing in the traditional fermentation method, the reduction method, the hydration method and the oxidation synthesis method; the mesoporous framework metal hybrid catalyst prepared by the method and the cocatalyst have a synergistic effect, so that the conversion rate and the yield can be improved; and by using the two-stage rectifying tower sequential cutting method, the product purity and the yield are high by optimizing conditions, wherein the product purity is greater than or equal to 99.0%, and the single yield is greater than or equal to 95.4%.

Description

technical field [0001] The invention relates to a method for preparing alkane alcohols, in particular to a green method for preparing alkane alcohols by liquid-phase hydrogenation. Background technique [0002] Alcohols are compounds that contain hydroxyl groups bonded to carbons on the side chains of hydrocarbon groups or benzene rings in their molecules. Its functional group is -OH. Alcohols are widely used, whether in chemical industry, pesticide field or cosmetic field, their application is irreplaceable. N-propanol can be used directly as a solvent or to synthesize propyl acetate. In many cases, it can replace ethanol with a relatively low boiling point for paint solvents, printing inks, cosmetics, etc.; it can be used to produce intermediate n-propylamine for medicine and pesticides. Used in the production of feed additives, synthetic spices, etc.; n-propanol is used in the pharmaceutical industry to produce probenecid, sodium valproate, erythromycin, epilepsy, adhes...

AI Technical Summary

Problems solved by technology

However, this method cannot be produced industrially on a large scale

The reduction method commonly used in industry is to prepare alcohols by reducing carbonyl compounds or ester-based compounds with hydrogen under the action of catalysts. Most of the catalysts used in previous processes are noble metal catalysts. Increased production costs, which is not conducive to industrial production; hydration method, hydration method is divided into direct hydration method and indirect hydration method, using olefins and water as raw materials, under the action of a catalyst, alcohols are obtained through addition reaction, n-propanol synthesis process The process is as follows: 1-Propylene and water are used as raw materials, phosphoric acid-diatomaceous earth is used as a catalyst, and then neutralized with an aqueous alkali solution or an alkali-containing dilute ethanol solution. The reaction temperature is 325°C and the reaction pressure is 6.9MPa. Although the hydration method is largely It saves the cost of survival, but there are many side reactions in this method, resulting in a low yield of alcohols; there are also oxidation synthesis, condensation reaction, reduction of fat and oil, etc.

[0004] The above methods all have problems such as many side reactions and low selectivity, so it is necessary to develop a method for efficiently preparing high-purity alcohols

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