System and method for producing refined cyclohexanone

Abstract

The invention discloses a system and a method for producing refined cyclohexanone. The system comprises a drying tower, a drying tower liquid-gas-phase heat exchanger, a light component tower, a lightcomponent tower gas-phase heat energy recycling machine, a ketone tower, an alcohol tower and the like. The method includes carrying out drying; removing light components; purifying cyclohexanone; purifying cyclohexanol to obtain the refined cyclohexanone. The system and the method for producing the refined cyclohexanone have the advantages that vacuumizing is creatively carried out by the aid ofmechanical vacuum pumps, accordingly, power and steam can be saved, and the sewage discharge and the circulating water usage of the system can be reduced; the quantity of equipment can be reduced, technological processes can be shortened, the investment can be lowered, a large quantity of steam can be saved, and the system is easy to operate; alcohol ketone recycling systems and steam jet vacuumizing systems in existing production technologies are replaced with mechanical vacuum pump systems of the light component tower, the ketone tower and the alcohol tower, wastewater producing links of devices are completely eradicated, water brought into the system by alcohol ketone solution can be completely recycled to be reused as technological water, accordingly, the system and the method are truly free of sewage discharge, and the refined cyclohexanone can be produced by the aid of the system and the method in a green and environment-friendly manner.

Description

technical field [0001] The invention relates to the technical field of cyclohexanone production, in particular to a production system and method for refining cyclohexanone. Background technique [0002] In the cyclohexanone production unit, due to the low conversion rate of cyclohexanone produced by cyclohexanol dehydrogenation, generally 45 to 55%, the alcohol and ketone solution after the reaction contains cyclohexanone, cyclohexanol, light components, heavy components and A small amount of water, to obtain pure cyclohexanone and cyclohexanol requires specific equipment for separation and purification, and because cyclohexanol and cyclohexanone have a high boiling point and are not easy to separate, vacuum distillation is generally used at present. The equipment is a multi-stage steam ejector system. The vacuuming system has a long process, consumes more steam and circulating water, and produces more waste water; because steam is added to the system, not only the steam con...

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Problems solved by technology

[0002] In the cyclohexanone production unit, due to the low conversion rate of cyclohexanone produced by cyclohexanol dehydrogenation, generally 45 to 55%, the alcohol and ketone solution after the reaction contains cyclohexanone, cyclohexanol, light components, heavy components and A small amount of water, to obtain pure cyclohexanone and cyclohexanol requires specific equipment for separation and purification, and because cyclohexanol and cyclohexanone have a high boiling point and are not easy to separate, vacuum distillation is generally used at present. The equipment is a multi-stage steam ejector system. The vacuuming system has a long process, consumes more steam and circulating water, and produces more waste water; because steam is added to the system, not only the steam consumption is high, but also more sewage is generated. Before the sewage is sent to the sewage treatment plant, the materials in the sewage need to be recovered. It needs to be recovered and treated by extraction, stripping and alkane distillation, and then discharged. The device is complicated, the process is long, the investment cost of equipment is high, and more steam and circulating water are consumed; On the other hand, the process steam with a higher temperature grade is directly condensed, which wastes both heat and circulating water

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