Process for post-treatment of acephate and method for recovering waste water resources

An acephate, resource recovery technology, applied in chemical instruments and methods, extraction water/sewage treatment, neutralized water/sewage treatment, etc. problem, to achieve the effect of reducing ammonia nitrogen emissions

Inactive Publication Date: 2010-06-16
浙江嘉化集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this type of treatment process are: a. high energy consumption; b. the treatment process is not friendly to the environment and emits a large odor; c. the obtained ammonium sulfate content is not high and contains many organic impurit

Method used

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  • Process for post-treatment of acephate and method for recovering waste water resources
  • Process for post-treatment of acephate and method for recovering waste water resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Neutralization: In the enamel reactor with stirring, add 2200kg of water, start stirring, drop into 450kg of anhydrous sodium carbonate solid, stir for 30min to dissolve, pour into the metering tank, add 1000kg of acylation mother liquor in the enamel reactor (take From our company's acephate synthesis process), turn on the cold ice water, start to add sodium carbonate solution dropwise to the enamel reaction kettle, keep the temperature below 30°C, measure the pH value after the dropwise addition, and the pH value is 7.5.

[0023] b. Extraction: Add 1800L of dichloromethane to the above-mentioned neutralization solution, stir for 10 minutes, stand still and separate layers, and the lower layer is desolvated and crystallized to obtain acephate, and the solvent is recovered and applied mechanically to obtain 3497 kg of the upper layer, which contains sodium acetate. Wastewater, sodium acetate content is 19.5%.

[0024] C, hydrolysis: open the reflux condenser, the abo...

Embodiment 2

[0028] a. Neutralization: Add 2200kg of water to the enamel reaction kettle with stirring, start stirring, put in 710kg of sodium bicarbonate solid, stir for 30min to dissolve, put it into the metering tank, add 1000kg of acylation mother liquor to the enamel reaction kettle, start the cooling Ice water, start to add sodium carbonate solution dropwise to the enamel reaction kettle, keep the temperature below 30°C, measure the pH value after the dropwise addition, PH=7.

[0029] b. Extraction: Add 1800L of chloroform to the above-mentioned neutralization solution, stir for 10 minutes, static layering, the lower layer solution is desolvated and crystallized to obtain acephate, the solvent recovery is applied mechanically, and the upper layer solution is 3462kg, which is waste water containing sodium acetate. The sodium acetate content is 19.9%.

[0030] C, hydrolysis: open reflux condenser, the above-mentioned waste water containing sodium acetate is warmed up to 70 ℃, dropwise ...

Embodiment 3

[0034] a. Neutralization: Add 1500kg of water into the enamel reaction kettle with stirring, start stirring, put in 1200kg of sodium carbonate decahydrate solid, stir for 30 minutes to dissolve, put it into the metering tank, add 1000kg of acylation mother liquor into the enamel reaction kettle, and start Cold ice water, start to add sodium carbonate solution dropwise to the enamel reaction kettle, keep the temperature below 30°C, measure the pH value after the dropwise addition, PH=6.5.

[0035] b. Extraction: Add 1800 L of dichloroethane to the above neutralization solution, stir for 10 minutes, and let the layers stand still. The lower layer is desolvated and crystallized to obtain acephate, and the solvent is recovered and applied mechanically to obtain 3537 kg of the upper layer, which is acetic acid-containing Sodium wastewater, sodium acetate content is 19.4%.

[0036] C, hydrolysis: open the reflux condenser, the above-mentioned waste water containing sodium acetate is...

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Abstract

The invention provides a process for post-treatment of acephate and a method for recovering waste water resources. The process comprises the following steps of: a, using sodium-containing weak alkali to neutralize acidylated mother liquor; b, adding a solvent into the mother liquor for extraction, separation and recovery of acephate; c, adding alkali into the sodium acetate-containing waste water obtained by the step b to hydrolyze organic matters remained in the waste water into low-boiling point organic matters or salts; d, condensing the hydrolyzed waste water, wherein in the condensing process, the low-boiling point organic impurities are distilled out along with water, and the salts and other impurities which are generated by hydrolysis are separated by crystallization; and filtering condensed solution to obtain the solution of sodium acetate, which is more pure; and e, performing cooling crystallization and centrifugal separation of the solution of sodium acetate to obtain sodium acetate trihydrate crystals. The method has the advantages that: the emission of ammonia nitrogen is reduced from the source, and the acephate is effectively separated and recovered; the solution of sodium acetate is purified by means of hydrolysis and condensation, the crystal content of sodium acetate trihydrate is as high as 58 to 60 percent and meets the industrial grade requirement, so that the method can be widely applied in industries of weaving, dyeing, dyes and the like.

Description

Technical field: [0001] The invention relates to a chemical production wastewater treatment process, an acephate post-treatment process and a waste water resource recovery treatment method. Background technique [0002] At present, the post-treatment process of domestic acephate production generally adopts the method of neutralizing the acetylation reaction liquid (hereinafter referred to as "acylation mother liquor") in the synthesis process of acephate in ammonia water, and neutralizes the acetic acid in the acylation mother liquor. After that, acephate is extracted and separated with a solvent. Then the remaining waste water is treated, and the method of waste water treatment has the following two kinds: [0003] One is the acid treatment recovery method. For example, such as Chinese patent application No. 200610147619.0 "Wastewater Treatment Method for Acephate Production by Ammonia Neutralization Method", No. 200710052210.5 "Acephate Pesticide Wastewater Treatment and...

Claims

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Application Information

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IPC IPC(8): C07F9/24C07C53/10C07C51/42C02F9/04C02F1/66C02F1/26
Inventor 徐文梅周幼红钱柯伟纪宝琳吴忠
Owner 浙江嘉化集团股份有限公司
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