Process for producing cyclohexanone by performing incomplete hydrogenation

The invention discloses a process for producing cyclohexanone by performing incomplete hydrogenation. The production process comprises the following steps of: feeding benzene and hydrogen serving as raw materials into a reactor 1 in the volume ratio 1.17:1-1.19:1 in sequence, and reacting at the temperature 100-180 DEG C and under the pressure 3-10 MPa under the action of a ruthenium catalyst; when the residual hydrogen is less than 3-5 percent, making reaction intermediate materials naturally flow from the bottom outlet of the reactor 1 to the bottom inlet of a reactor 2, and continually reacting at the hydrogen feeding amount 3,600-3,800 m /h at the temperature 100-180 DEG C and under the pressure 3-10 MPa; and when the reaction benzene transformation ratio is up to 50-60 percent, lowering the temperature to the normal temperature, lowering the pressure to the normal pressure, introducing reaction materials into a membrane separator of which the separating accuracy is 0.1-5 mum for separating to obtain a cyclohexanone intermediate product, hydrating and catalyzing cyclohexanone to generate a cyclohexanol intermediate product, and dehydrogenating cyclohexanol to generate cyclohexanone. According to the production process, a catalyst precipitating process is eliminated, and the use of a precipitating block and a precipitating groove is avoided; compared with a precipitating groove process, the process has the advantages: millions of equipment investment can be reduced, and a large quantity of technology introduction expenses can be saved; and the production process has wide development and application prospects.