Method for extracting n-butyric acid, valeric acid and hexoic acid from lyechange as by-product of cyclohexanone production

Abstract

The invention relates to a method for extracting n-butyric acid, valeric acid and hexoic acid from lyechange as a by-product of cyclohexanone production. The method comprises the following steps: carrying out preprocessing on a sodium sulfate aqueous solution; preprocessing the evaporated mother liquor; conveying slurry in a concentration jar for concentration; washing the concentrated salt with a small amount of water; discharging the water for washing and the crystallization water into a delamination jar of the sodium sulfate aqueous solution through an outlet of the concentration jar; discharging the concentrated salt into a centrifugal machine for centrifugal dehydration from the concentration jar; self-flowing water dehydrated from the centrifugal machine into the delamination jar of the sodium sulfate aqueous solution through high order difference; re-separating organic matters in the crystallization water and the water dehydrated from the centrifugal machine; carrying out warming and reduced pressure distillation on saponifiedoil by using an enamelstill, a stainless steel kettle or a film evaporator; adding a reasonable amount of lower alcohol into the tail oil obtained by distilling monobasic acid; and carrying out esterification reaction on the tail oil and conversing the remained organic acid into esters.

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...

AI Technical Summary

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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