CYCLOHEXANE PRODUCTION METHOD Russian patent published in 2019 - IPC C07C5/10 C07C13/18 

FIELD: chemistry.

SUBSTANCE: invention relates to the cyclohexane from benzene producing method, comprising the benzene three-stage sequential hydrogenation in the hydrogenation reactors at elevated temperature and pressure in the presence of hydrogenation catalyst and the hydrogen-containing gas, hydrogenate from the gas subsequent separation after the third stage of hydrogenation with the cyclohexane fraction release and its partial recycling to the hydrogenation first stage. Invention is characterized by the fact that part of the selected cyclohexane fraction is directed for mixing with benzene in the mass ratio of 4–10:1, C₆ hydrocarbons with benzene content of not more than 20 wt. % resultant mixture is supplied for the hydrogenation first stage, and for the hydrogenation the second and third stages hydrogenates are directed only after the hydrogenation first and second stages, respectively, at that, the C₆ hydrocarbons mixture or the hydrogenate after the hydrogenation first or second stages and the hydrogen-containing gas are directed to the respective hydrogenation reactors bottom part, hydrogenation first and second stages are carried out at a temperature of the reactor bottom part of not more than 30 °C and top part of not more than 180 °C, and the hydrogenation third stage is carried out at a temperature of the reactor bottom and top parts of not more than 180 °C.

EFFECT: development of the cyclohexane production more simple and cost effective method.

3 cl, 1 dwg, 2 tbl, 2 ex