System and method for recovering alcohol ketone by using thermal energy of wastewater

Abstract

The invention discloses a system and a method for recovering alcohol ketone by using thermal energy of waste water. The column top inlet of an extraction column communicates with a water inlet pipeline of process condensed water containing ketone alcohol; the column top outlet of the extraction column communicates with the middle inlet of an alkyl distillation column; the material outlet of the alkyl distillation column communicates with the column reactor inlet of the extraction column; the column top outlet of a wastewater stripping column communicates with the thermal medium inlet of a wastewater condenser; the thermal medium outlet of the wastewater condenser communicates with an alcohol ketone collection device; the column reactor outlet of the wastewater stripping column communicates with the thermal medium inlet of a wastewater heat exchanger; the thermal medium outlet of the wastewater heat exchanger communicates with the thermal medium inlet of a wastewater cooler; the cold medium inlet of the wastewater heat exchanger communicates with the column kettle outlet of the extraction column; the cold medium outlet of the wastewater heat exchanger communicates with the column top inlet of the wastewater stripping column; the thermal medium outlet of the wastewater cooler communicates with a wastewater conveying pipeline.

Description

technical field [0001] The invention belongs to the technical field of cyclohexanone refining, and in particular relates to a system and method for recovering alcohol and ketone by using waste water heat energy. [0002] technical background [0003] The process condensate produced in the refining process of cyclohexanone contains organic substances such as alcohol and ketone. The alcohol and ketone recovery unit uses the extractant cyclohexane to extract and recover the organic substances such as alcohol and ketone in the water seal tank of the refining unit. The cyclohexane is recycled, and the After extraction, the process condensate containing a small amount of alcohol and ketone organic matter is stripped by the waste water stripping tower, and the organic matter is recovered to the system, and the qualified high-temperature waste water is cooled to a qualified temperature and sent out to the device for harmless treatment. [0004] However, the existing alcohol and keton...

AI Technical Summary

Problems solved by technology

[0004] However, the existing alcohol and ketone recovery unit is difficult to recover the alcohol and ketone and other organic substances in the process condensate more thoroughly, and the wastewater discharged from the waste water stripping tower still contains organic substances such as alcohol and ketone, which increases the cost of wastewater treatment. And caused a waste of resources such as alcohol and ketone

At the same time, the temperature of the wastewater discharged from the waste water stripping tower is relatively high, and it needs to be cooled to 50-55°C before it can be discharged into the sewage treatment system. The cooling heat of the wastewater requires a large amount of cooling circulating water, which also causes a waste of energy.

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