Technique for preparing cyclohexane by benzene hydrogenation using hydrogen produced by oxygen enrichment natural gas steam reforming method

Abstract

The invention relates to a technique method for using hydrogen obtained from rich oxygen in a natural gas steam reforming method to prepare cyclohexane with benzene hydrogenation, in particular to be used in the raw material hydrogen which is needed in the cyclohexane production technique. The rich oxygen produced in a rich oxygen device and the reforming gas obtained from a natural gas steam reforming method in a primary reformer are reacted in a secondary reformer; and then the steps of medium and low change, decarburization and methanation to prepare hydrogen with high hydrogen content which is used for producing cyclohexane, thereby reducing the hydrogenation exhaust emissions. The devices for realizing the treatment method comprises a rich oxygen production device, a rich oxygen condensing machine, rich oxygen content controlling system, natural gas steam primary reformer, a secondary reformer, a middle and low furnace, a decarbuation device, a methanation furnace and a benzene hydrogenation furnace. The invention has the advantages of replacing air with rich oxygen, reducing the content of nitrogen in the hydrogen production process and the tail gas discharging amount in the benzene hydrogenation process, increasing the hydrogen content in the hydrogen production process; the hydrogen is used in the benzene hydrogenation process, thereby achieving the purpose of energy saving, discharge reduction and environmental protection.

Description

technical field [0001] The invention relates to a process method for hydrogenation of benzene to cyclohexane by using hydrogen enriched in natural gas steam reforming. It is especially suitable for raw material hydrogen for the production of cyclohexane from benzene hydrogenation in the cyclohexanone production industry. technical background [0002] At present, in the cyclohexanone production industry, there are many sources of hydrogen in the production process of hydrogenation of benzene to cyclohexane and reoxidation of cyclohexane to cyclohexanone. The steam reforming of natural gas and the production of hydrogen by two-stage air oxidation are the traditional ones. One of the methods. Nitrogen in the air does not participate in the reaction as an inert gas in the entire production process. Heating, cooling, and finally venting during the production process consume a lot of energy and cause air pollution, which increases the capacity of the equipment and increases the c...

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Problems solved by technology

Nitrogen in the air does not participate in the reaction as an inert gas in the entire production process. Heating, cooling, and finally venting during the production process consume a lot of energy and cause air pollution, which increases the capacity of the equipment and increases the cost investment.

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