Technology for comprehensively treating heavy oil produced in hydration-method cyclohexanone production process

Abstract

The invention provides a technology for comprehensively treating heavy oil produced in a hydration-method cyclohexanone production process. The technology comprises the following steps: conveying a byproduct heavy oil of a hydration-method cyclohexanone device into the middle part of a primary separation tower; separating by a tower kettle of the primary separation tower to obtain a component witha boiling point greater than that of phenol and conveying the component into a middle component tower; separating at a tower top of the primary separation tower to obtain the phenol and a light component with the boiling point smaller than that of the phenol; conveying the phenol and the light component into the middle part of a co-boiling rectifying tower; obtaining a mixture of cyclohexanone and cyclohexanol at the tower top of the co-boiling rectifying tower, and conveying the mixture into the middle part of a cyclohexanone tower; separating by the tower kettle to obtain a highest-boiling-point azeotrope formed by the phenol and an azeotrope agent; conveying the highest-boiling-point azeotrope into the middle part of a phenol recycling tower; separating at the tower top of the cyclohexanone tower to obtain cyclohexanone and extracting the cyclohexanone; separating by the tower kettle to obtain the cyclohexanol and extracting the cyclohexanol as a product. According to the technology provided by the invention, cyclohexanone, cyclohexanol, phenol and dipolyketone products are obtained respectively by carrying out comprehensive recycling and utilization on the heavy oil; meanwhile, byproducts including chemical light oil and dreg oil are produced, the utilization rate of the byproduct heavy oil is improved, the operation cost of the device is reduced and the environment pollution is reduced.

Description

technical field [0001] The invention belongs to the field of chemical separation, and in particular relates to a process for comprehensively treating heavy oil produced in the process of producing cyclohexanone through hydration. Background technique [0002] The production route of adipic acid and caprolactam based on cyclohexene hydration method is the mainstream process in industrial production at present. In the refining process of cyclohexanone, in order to separate and obtain cyclohexanone and cyclohexanol with satisfactory purity, some light oil and heavy oil will be produced. Among them, light oil mainly contains n-pentane, n-hexane, methylcyclopentane, methylcyclopentene, benzene, cyclohexene, cyclohexane, methylcyclohexane, cyclohexanol and cyclohexanone, etc. Among them, the content of benzene, cyclohexane, cyclohexanone and cyclohexanol is relatively high, which can be recycled by simple rectification. At present, there are many research examples of light oil r...

AI Technical Summary

Problems solved by technology

The heavy oil mainly contains cyclohexanone, cyclohexanol, phenol, 1-cyclohexenyl cyclohexene, cyclohexyl ether, 2-cyclohexylidene cyclohexanone, 2-(1-cyclohexenyl) Cyclohexanone and 4-cyclohexylphenol, etc., are difficult to separate and recover due to their complex components and large molecular weight. At present, they are mostly burned in the device, and some companies sell them as by-product fuel oil, and the price is relatively low. Contains toxic and harmful substances, causing more secondary hazards and polluting the environment. Strictly speaking, direct sales are not allowed

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