Method for producing cyclohexanone by using coked benzene

Abstract

The method for producing cyclohexanone by using coked benzene is implemented according to the following steps: A. hydrogenation of the coked benzene to prepare cyclohexene; B. extraction and rectification; C. hydratization of the cyclohexene to prepare cyclohexanol; D. separation and extraction of the cyclohexanol; E. dehydrogenation of the cyclohexanol to prepare the cyclohexanone; and F. refining of alcohol and ketone. The method has the advantages that 1. as the coked benzene, the product of the coal chemical industry, is used as the raw material, the method has resource advantage and cost advantage and saves 15-20 percent of resource and cost when compared with a cyclohexane method; 2. the method has high comprehensive yield rate and low hydrogen consumption, almost 99 percent of the coked benzene is converted into usable products, namely the cyclohexanone and the cyclohexane, the ratio between the cyclohexanone and the cyclohexane is 1:0.25, and the hydrogen consumption is reduced by two thirds; 3. the method is environment friendly; a small amount of waste gas and waste liquid is generated, and the investment in waste disposal is small, therefore the method is a clean production technology; and 4. the method is safer; the hydrogenation reaction and the hydratization reaction are both carried out in liquid, conditions are mild, and the method is safer when compared with a traditional oxidation technology, prevents the corrosion and the byproduct blockage and has high operation stability.

Description

technical field [0001] The invention relates to a method for producing cyclohexanone by using coking benzene as a raw material, and belongs to the technical field of coal chemical synthesis. Background technique [0002] At present, the production of cyclohexanone at home and abroad mainly contains the following two routes: (1) phenol method - use nickel as a catalyst to obtain cyclohexanol by hydrogenation of phenol, and then use zinc as a catalyst to obtain cyclohexanone through dehydrogenation. (2) Cyclohexane oxidation method - hydrogenation of petroleum benzene and hydrogen in the presence of a nickel catalyst to produce cyclohexane, cyclohexane and air oxidation reaction to produce cyclohexanone and cyclohexanol, and cyclohexanone products are obtained by separation , cyclohexanol is dehydrogenated (zinc, calcium or zinc-copper catalyst) to generate cyclohexanone product. The cyclohexane oxidation process is the mainstream process at home and abroad, and all domestic ...

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Problems solved by technology

The cyclohexane oxidation process is the mainstream process at home and abroad. All domestic manufacturers adopt this process, but there are problems such as low yield (only 75-80%), many by-products, large discharge of three wastes, and high safety requirements.

(3) The current technology at home and abroad is to produce cyclohexanone with petroleum benzene as raw material, and the economic form of my country's poor oil and rich coal makes the raw material source and production cost of cyclohexanone have problems to varying degrees

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