Method for treating high-concentration organic process wastewater generated in production of 2-chloro-6-fluorobenzaldehyde

Abstract

The invention discloses a method for treating high-concentration organic process wastewater generated in the production of 2-chloro-6-fluorobenzaldehyde. The method comprises the following steps: adding quicklime and flocculant into the wastewater and then regulating with acid; allowing the wastewater regulated with acid to pass through an adsorption tower filled with a nonpolar macroporous absorption resin I; respectively obtaining a primary saturated absorption resin and a primary eluent; performing desorption regeneration to the primary saturated absorption resin with a solvent I to obtaina solution after primary desorption; regulating the primary eluent with acid, and allowing the eluent regulated with acid to pass through an adsorption tower filled with a nonpolar macroporous absorption resin II; respectively obtaining a secondary saturated absorption resin and a secondary eluent; performing desorption regeneration to the secondary saturated absorption resin with a solvent II toobtain a solution after secondary desorption; and finally respectively recovering, purifying and separating the solution after primary desorption and the solution after second desorption to obtain 3-chloro-2-methylphenol, 2-chloro-6-fluorobenzaldehyde and 2-chloro-6-fluorobenzoicacid. The method can realize the organic combination of wastewater treatment and resource recovery.

Description

technical field [0001] The invention relates to the field of organic fine chemical waste water treatment, in particular to a method for treating high-concentration fluorine-containing aromatic hydrocarbon organic waste water produced in the production process of 2-chloro-6-fluorobenzaldehyde and resource reuse. Background technique [0002] 2-Chloro-6-fluorochlorobenzyl, 2-chloro-6-fluorobenzaldehyde and 2-chloro-6-fluorobenzoic acid are important organic chemical raw materials and key intermediates, mostly used in the synthesis of medicines, dyes and agricultural chemicals , mainly synthesized by diazo, chlorination and hydrolysis routes. During the process, organic wastewater with strong acidity, high salt content, complex composition and high chemical oxygen consumption will be produced, the main components of which are fluorine-containing aromatic hydrocarbons and phenolic substances. Phenols and fluorine are protoplasmic poisons, which are easy to combine with protopla...

AI Technical Summary

Problems solved by technology

[0007] 1. Wastewater contains a large amount of inorganic salts, high concentrations of acid and fluoride ions, which will reduce the respiration rate of microorganisms, thereby affecting the degradation efficiency of organic pollutants in the treatment system

[0008] 2. Wastewater contains a large amount of phenols such as 3-chloro-2-methylphenol, 2-chloro-6-fluorobenzaldehyde and 2-chloro-6-fluorobenzoic acid, and fluorine-containing aromatic hydrocarbons have poor biodegradability, even if After biodegradation, the fluoride ions released by it are cytotoxic, which will affect the growth of microorganisms, and also cause the discharge of fluoride ions to exceed the standard

[0009] 3. The material resources in the wastewater cannot be recycled

[0010] 4. The unorganized discharge of irritating volatile organic compounds in the process of wastewater treatment destroys environmental quality and affects human health

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