Distillation and purification method of o-nitroethylbenzene

Abstract

The invention provides a distillation and purification method of o-nitroethylbenzene. In the method, used and polluted o-nitroethylbenzene serving as a solvent is infiltrated into a distillation kettle, and a double-effect evaporator is utilized to carry out distillation and purification. The method comprises the following steps: heating a material liquid in the tube of a heater until the boiling point of the material liquid is reached, and vaporizing partial water so as to generate the autonomous circulation of the material liquid; heating and concentrating the material liquid in the heating tube, wherein the vaporization temperature of the material liquid can be controlled at 155 DEG C+ / -5 DEG C, and the vapor pressure of the material liquid is controlled at 6-8kg PMa; and when the content of the moisture in the o-nitroethylbenzene is less than 0.2g / L, starting to continuously discharge and simultaneously continuously feed, so as to form continuous vacuum concentration operation. The distilled o-nitroethylbenzene is faint yellow and hardly contains moisture and impurities; and condensate water is reused as bottom water, residue materials after distillation are reused as raw materials to continuously react, thereby achieving zero emission in the production process.

Description

Technical field: [0001] The present invention belongs to a chemical process method, and especially designs a distillation purification method of o-nitroethylbenzene. Specifically, it utilizes distillation and multi-effect evaporation, and realizes the purification of o-nitroethylbenzene through the self-circulating evaporation of feed liquid. The invention discloses a process system for closed and continuous purification of benzene, which belongs to the field of refining and purification of chemical products. Background technique: [0002] Due to its own stability, o-nitroethylbenzene is often used as a solvent in organic synthesis and dye production, and the annual consumption in the world is quite considerable. However, because o-nitroethylbenzene itself does not participate in the reaction, it is recycled in the chemical production process, so it must be purified after each process is used, so as not to affect its subsequent reaction due to the existence of impurities and...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and provide a kind of distillation purification method for o-nitroethylbenzene, using the refining method, the obtained o-nitroethylbenzene has high yield and high purity , so that the materials and water are completely separated, which can not only solve the problem of a large amount of wastewater generated in the washing of o-nitroethylbenzene, and the problem of volatilization caused by too high washing temperature, but also the materials and water in the o-nitroethylbenzene Recycle and make full use of, truly achieve zero emissions, and have high economic and social benefits

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