Method for extracting ethyl acetic acid, pentanoic acid and hexanoic acid from byproduct waste alkali liquid discharged during production of cyclohexanone

Abstract

The invention relates to a method for extracting ethyl acetic acid, pentanoic acid and hexanoic acid from byproduct waste alkali liquid discharged during production of cyclohexanone. The method comprises the following steps of: 1) adding waste water produced during extraction of organic acid into waste alkali liquid and neutralizing free alkali in the waste alkali liquid by using organic acid and inorganic acid in the waste water; 2) adjusting the pH of the waste alkali liquid to be between 7 and 9.0 and evaporating; 3) conveying high-concentration waste alkali liquid obtained after evaporation into a specific neutralizing reactor for a neutralization reaction; 4) conveying the neutralized mother liquor into a concentrating tank for concentrating, and making water dehydrated from a centrifugal machine and water overflowing from the concentrating tank flow into a waste water receiving tank under the action of height difference; 5) adding an appropriate amount of low carbon alcohol into tail oil produced by distillation of monobasic acid, and performing an esterification reaction on the tail oil so as to convert residual organic acid into ester; and 6) heating, decompressing, distilling, separating water in saponified oil, organic acid and high-boiling-point substances in the saponified oil, and separating the ethyl acetic acid, the pentanoic acid and the hexanoic acid in the separated organic acid by a rectification process.

Description

technical field [0001] The present invention relates to a kind of waste lye produced by neutralizing the organic acid in the oxidation liquid and the organic acid ester in the saponification oxidation liquid with NaOH aqueous solution in the production process of preparing cyclohexanone by the oxidation of cyclohexane, and A method for extracting n-butyric acid, n-valeric acid and n-hexanoic acid from waste lye. Background technique [0002] In the prior art, waste lye is incinerated in order to solve the environmental pollution problem in the production process of cyclohexanone, and this method only solves the pollution problem in the production process of pimelinketone, while the organic waste in the waste lye The acid is not recovered, which wastes resources. Among them, the fuel of the incineration method mainly depends on fuel oil. my country is an oil-poor country, and more than 80% of fuel oil is imported, which belongs to the country's strategic reserve materials. It...

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Problems solved by technology

[0002] In the prior art, waste lye is incinerated in order to solve the environmental pollution problem in the production process of cyclohexanone, and this method only solves the pollution problem in the production process of pimelinketone, while the organic waste in the waste lye The acid is not recycled, which wastes resources. Among them, the fuel of the incineration method mainly depends on fuel oil. my country is an oil-poor country, and more than 80% of fuel oil is imported, which is a national strategic reserve material.

Its two, incineration method investment cost is big, and same type device incineration investment is three times of the present invention

Third, the operation cost of the incineration method is high, and the high-priced fuel oil incineration waste lye increases the production and operation cost of cyclohexanone. Fourth, the dust generated by the incineration method during the incineration process, CO 2 , NO x Harmful gases such as pollute the atmosphere and increase greenhouse gas emissions

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