CONTINUOUS PROCESS FOR THE PRODUCTION OF PURIFIED CYCLOHEXANONE Russian patent published in 2018 - IPC C07C45/53 C07C45/80 C07C49/403 

FIELD: chemistry.

SUBSTANCE: present invention relates to a continuous process for the production of purified cyclohexanone, which is an intermediate product for the production of nylon-6. Method includes the following steps: I. oxidation of cyclohexane in a liquid phase with an oxygen containing gas forming cyclohexyl hydroperoxide, cyclohexanone, cyclohexanol, esters of cyclohexanol and carboxylic acids; II. decomposition of the cyclohexyl hydroperoxide produced in step I in the presence of an aqueous alkaline solution resulting in an organic phase comprising cyclohexane, cyclohexanone and cyclohexanol and an aqueous phase; III.separation of the organic phase and the aqueous phase produced in step II; IV. removal of cyclohexane from the organic phase obtained in step III, resulting in a residue comprising cyclohexanone, cyclohexanol and alkali metal salts; V. removal of alkali metal salts by washing the residue obtained in step IV with water; VI. removal of components with a boiling point lower than that of cyclohexanone from the residue obtained in step V, resulting in a residue comprising cyclohexanone and cyclohexanol; VII. recovery of cyclohexanone from the residue obtained in step VI, resulting in a residue comprising cyclohexanol; Residue obtained in step IV is not washed with an aqueous alkaline solution before use in step VI.

EFFECT: proposed process according to the invention makes it possible to obtain cyclohexanone containing less than 1 % by weight impurities.

17 cl, 1 dwg, 5 ex