Method for separating toluene-ethylene glycol mixture by continuous azeotropic distillation

Abstract

The invention provides a method for separating a toluene-ethylene glycol mixture by continuous azeotropic distillation, and belongs to the field of separation of toluene-ethylene glycol azeotropic mixtures. The energy consumption and investment are reduced when the product quality is improved. a continuous operation mode can be selected under the condition of a relatively large production scale; the product quality can be stabilized; the benefits can be improved; the labor cost can be reduced; water is adopted as an entrainer in innovation of the entrainer; in product quality, high-purity toluene and ethylene glycol products can be obtained by the method; and the discharged wastewater can reach the discharge standard at one time.

Description

technical field [0001] The invention relates to the field of separation of toluene-ethylene glycol mixtures, in particular to a continuous azeotropic distillation separation method of toluene-ethylene glycol mixtures. Background technique [0002] Both toluene and ethylene glycol are commonly used solvents or raw materials in the chemical and pharmaceutical fields, and they are used in huge quantities. Toluene is widely used as a solvent and high-octane gasoline additive, and is also an important raw material for organic chemical industry, but compared with benzene and xylene obtained from coal and petroleum at the same time, the current production is relatively surplus, so a considerable amount of toluene is used for degassing Alkyl benzene or disproportionation to xylene; a series of intermediates derived from toluene are widely used in the production of fine chemicals such as dyes, medicines, pesticides, explosives, auxiliaries, spices, etc., and are also used in the synt...

AI Technical Summary

Problems solved by technology

The main problem of this invention is: firstly, the patent specification does not mention the compensation of the entrainer. Due to the long continuous operation period, part of the entrainer will be lost with the extraction of the product, resulting in a continuous decrease in the content of the entrainer in the system. As a result, the quality of the product is difficult to ensure stability; moreover, the process follows the traditional reflux method, resulting in an increase in energy consumption; in addition, the process does not mention whether the discharge of the entrainer recovery tower bottom water meets the discharge standard

[0005] At present, there are no relevant publications or reports on the separation of toluene-ethylene glycol azeotropic mixture

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