Method for producing acetophenone through catalytic oxidation of ethylbenzene

Abstract

The invention discloses a method for producing acetophenone through catalytic oxidation of ethylbenzene. The method comprises the following steps of: (1) adding the ethylbenzene, a solvent, an initiating agent and a carbon material catalyst into a reactor, and mixing to form mixed suspension liquid; (2) raising the temperature of the mixed suspension liquid obtained in the step (1) to 50-250 DEG C, introducing sufficient oxygen or air which serve as an oxidizing agent, keeping the pressure of 0.1 to 5MPa, and reacting for 0.1 to 20 hours; (3) separating the reaction mixture obtained in the step (2), and thus obtaining a solid catalyst and a liquid phase mixture; and (4) separating the liquid phase mixture obtained in the step (3), and thus obtaining the acetophenone. By the method, the corrosion to equipment and the pollution to the environment due to the usage of acetic acid and a metal catalyst are prevented; the problems that a homogeneous catalyst is difficult to recover and is inactivated in the ethylbenzene oxidation process can be solved; and the method is high in reaction selectivity and high in activity. The catalyst used in the method is high in stability and can be recovered and reused, so that the cost is reduced, and the efficiency is improved.

Description

technical field [0001] The invention relates to a method for preparing acetophenone, in particular to a method for preparing acetophenone in one step through the catalytic oxidation of ethylbenzene, belonging to the technical field of organic synthesis applications. Background technique [0002] Acetophenone is an important organic synthesis intermediate, which is widely used in the synthesis of perfumes, drugs, esters and other organic synthesis raw materials. It is also a good solvent for cellulose ethers, cellulose esters and resins, and a plasticizer for plastics. , has broad application prospects. In the traditional production process of acetophenone, the homogeneous reaction of Friedel-Crafts alkylation is mainly used, that is, it is produced by the reaction of benzene with acetyl chloride, acetic anhydride or acetic acid under the catalysis of stoichiometric anhydrous aluminum trichloride. This method produces a large amount of toxic and corrosive waste liquid, easil...

AI Technical Summary

Problems solved by technology

This method is a homogeneous catalytic process with a high yield, but the amount of catalyst used is large, the price is expensive, and it cannot be recycled and reused

[0008] From the above, it can be seen that the recovery of supported catalysts is easy to cause the loss of active components, and the homogeneous catalytic oxidation process generally has the disadvantage that the catalyst is difficult to separate and recover.

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