In the petrochemical industry, the hydrogenation process is not only used for hydrocracking, but also widely used for hydrorefining to remove impurities such as oxygen, sulfur, and nitrogen in the oil, and to saturate all olefins and aromatics. Saturation to improve the quality of oil products. In the coal chemical industry, it is used in coal hydroliquefaction to produce liquid fuels. In the organic chemical industry, it is used to prepare various organic products, such as carbon monoxide hydrogenation to methanol, benzene hydrogenation to cyclohexane, phenol hydrogenation to cyclohexanol, aldehyde hydrogenation to alcohol, naphthalene hydrogenation to tetralin and Decahydronaphthalene (used as a solvent), nitrobenzene hydrogenation reduction to make aniline, etc. In addition, the hydrogenation process is also used as a refining method in the chemical industry to remove a small amount of harmful and difficult to separate impurities contained in organic raw materials or products. For example, when ethylene is refined, the impurity acetylene is hydrogenated to form ethylene; when propylene is refined The impurity propyne and propadiene are hydrogenated to form propylene; and the reaction of carbon monoxide hydrogenation to methane is used to remove a small amount of carbon monoxide in hydrogen.

Hydrogenation reactors are generally divided into two categories: one is used for the liquid phase hydrogenation process of high-boiling liquid or solid (solids need to be dissolved in a solvent or heated and melted) raw materials, such as the hydrogenation of fats and oils, and the hydrogenation of heavy oils. Cracking etc. Liquid-phase hydrogenation is usually carried out under pressure, and the process can be batch or continuous. Intermittent liquid phase hydrogenation often uses an autoclave with a stirring device or a bubbling reactor. The continuous liquid-phase hydrogenation can adopt a trickle bed reactor or a tubular reactor with three-phase continuous flow of gas, liquid and solid. Another type of reactor is used for continuous gas phase hydrogenation processes, such as atmospheric gas phase hydrogenation of benzene to produce cyclohexane, high pressure gas phase hydrogenation of carbon monoxide to synthesize methanol, etc. The type of reactor can be tubular or tower type.

This design is a tubular hydrogenation reactor, which belongs to an isothermal bed reactor. The catalyst is packed in the reactor tube, and the outer layer of the tube is a heat-conducting medium, which is used to raise or lower the temperature of the reactor to remove the heat of reaction. Tubular reactors are widely used in petrochemical industries, not only for hydrogenation, but also for oxidation, dehydrogenation and various catalytic reactions.

The hydrogenation reactor in this design is mainly used in the reaction process of benzene hydrogenation to cyclohexane.

Reactor structure diagram

Control room DCS operation interface

Main Specifications

It can be seen from the following data that the hydrogenation reactor part of this design process package has excellent reaction effect, the total conversion rate is greater than 99.95%, and the product selectivity is greater than 99.99%.

Industrial application performance

100,000 tons/year of benzene hydrogenation to cyclohexane in Shandong Liancheng