Method of treating hexane diacid preparation waste liquid

Abstract

This invention provides a treatment method for waste liquid from adipic acid production with simple process, good effect and low cost. Said method comprises: (1) adding waste liquid from adipic acid production and the extraction agent of ethyl acetate with the same volume as the waste liquid in an extraction equipment, vibrating and extracting, and standing to stratify the water and organic item, and flowing out the water and the remained extract containing three acids (adipic acid, glutaric acid and succinic acid), (2) repeating above steps to extract, (3) distilling the three acids-bearing extract no longer to be treated, evaporating the extraction agent of ethyl acetate, recycling, cooling the remainder and molding to obtain the three acids, and (3) adding alkaline substance to the water no longer to be treated, adjusting its pH within a range of 7-8, and discharging or taking it as liquid fertilizer. The approach is an advanced and mature technology with low energy consumption and no pollution. The three acid obtained have good quality and high efficiency.

Description

technical field [0001] The invention relates to a method for processing industrial waste liquid, in particular, relates to a method for processing adipic acid production waste liquid. Background technique [0002] At present, the large-scale enterprises producing adipic acid in my country mainly include Liaoyang Petrochemical Group and Pingdingshan Shenma Group 66 Salt Company. The treatment methods of adipic acid production waste liquid produced by these two enterprises are basically the same: Put the waste liquid into an acid-resistant reaction kettle, heat it with steam to evaporate the water and dilute nitric acid in the production waste liquid; then add lime to neutralize the condensed water of water vapor and nitric acid, adjust the pH value to 7-8, Finally, discharge; in addition, add the waste adipic acid without water into the high-temperature reactor to pass heat conduction oil, and continue heating. When the temperature reaches 160 ° C ~ 180 ° C, the contained nitri...

AI Technical Summary

Problems solved by technology

[0004] 1. In this process, NO 2 The absorption effect is affected by factors such as changes in the concentration of lye, changes in gas flow rate, and changes in gas temperature. These factors are likely to cause NO 2 A large amount of gas is discharged, polluting the air;

[0005] 2. This process needs to evaporate about 80% of the water in the adipic acid waste liquid, so the energy consumption is relatively high;

[0006] 3. The process requires a high temperature of 160°C to 180°C to decompose and produce NO 2 Gas, at high temperature, part of succinic acid, glutaric acid and adipic acid sublimate and run away, and part of triacids (adipic acid, glutaric acid and succinic acid) decompose, high energy consumption, easy loss, and easy coking of the product. The product is dark in color and poor in quality

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