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

A technology of fluorobenzaldehyde and a treatment method, which is applied in the field of organic fine chemical wastewater treatment, can solve the problems of reducing the respiration rate of microorganisms, poor biodegradation performance, and influence on microbial growth, etc. The effect of reducing purification costs
CN102115274AActive Publication Date: 2011-07-06ZHEJIANG DAYANG BIOTECH GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG DAYANG BIOTECH GROUP
Publication Date
2011-07-06

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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.
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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...

Claims

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