Technique for separating cyclohexanol in production process of cyclohexanone by adopting cyclohexene method

Abstract

The invention relates to a technique for separating cyclohexanol in a production process of cyclohexanone by adopting a cyclohexene method. The technique for separating the cyclohexanol in the production process of the cyclohexanone by adopting the cyclohexene method is mainly characterized in that two separation towers are adopted for replacing the existing single-tower separation technology, a two-effect parallel connection rectifying process is adopted, two rectifying towers adopt different operating pressures, and latent heat discharged during overhead gas phase condensation of a rectifying tower with a high operating pressure is taken as a heat source of a reboiler of a rectifying tower with a low operating pressure by utilizing pressure difference and temperature difference between the two rectifying towers. By adopting the technique provided by the invention, heat load, required by a cyclohexanol separation system, of the reboiler at the bottom of each tower is reduced by 30% compared with single-tower separation, and the heat load of a condenser at the top of each tower is reduced by 15% compared with the single-tower separation.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a process for separating cyclohexanol in the production process of cyclohexanone produced by cyclohexene method, in particular to a process for separating cyclohexene hydration reactants and cyclohexene refining tower by means of two-effect rectification. The technological method of cyclohexene, cyclohexanol and other components in cyclohexene from coming. Background technique [0002] At present, the production process of cyclohexanone mainly includes cyclohexane oxidation method and cyclohexene hydration method. The cyclohexane oxidation process is the mainstream process at home and abroad, but the yield of the cyclohexane method is only 75%-80%, and there are many by-product wastes and high safety requirements; the cyclohexene method has high comprehensive yield and low hydrogen consumption : 99.5% of benzene can be converted into products, namely cyclohexanone and cy...

AI Technical Summary

Problems solved by technology

Although these transformations have saved steam and cooling water to a certain extent, due to the large evaporation of the cyclohexanol separation tower and the large energy consumption, although the heat of the DMAC in the relevant processes has been fully utilized in the process, a large amount of medium-pressure Steam, such as the 100,000 tons / year cyclohexanol cyclohexanone device cyclohexanol separation tower required medium-pressure steam volume of 10 tons / hour, so the separation process of cyclohexanol is studied and a new separation process is developed. Reducing steam consumption is of great significance

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