Method for treating waster water produced by production of acephate with ammonia neutralization process

Acephate and treatment method technology, applied in water/sewage treatment, heating water/sewage treatment, water/sewage multi-stage treatment, etc., can solve environmental disputes with strong irritating odor, high biological toxicity, and perfect treatment of discharged wastewater and other issues, to achieve the effect of reducing wastewater treatment costs, reducing treatment costs, good economic and social benefits

Inactive Publication Date: 2008-06-25
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acephate manufacturers entrust environmental protection companies to incinerate high-concentration organic wastewater or discharge it after a large amount of dilution at a high cost. Due to the strong irritating odor and high biological toxicity of this phosphorus-containing pesticide, it is impossible to achieve perfect treatment of discharged wastewater Manufacturers are often caught in environmental disputes with surrounding residents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] ① Take 250ml of waste water (Zhejiang Jiaxing Chemical Co., Ltd., pH=7.0, density ρ=1.2869g / ml), and slowly add concentrated H 2 SO 4 (18.4mol / l) 28ml until the pH is 5, and the reaction temperature is controlled below 50°C.

[0033] ②Cool to room temperature (25°C) and wait for the white crystals to completely precipitate, then filter under reduced pressure to obtain (NH 4 ) 2 SO 4 White crystals, the mass is 50.12g.

[0034] ③ Distill the filtrate under reduced pressure with a rotary evaporator, heat at 60°C, completely distill out the acetic acid, condense and collect the fractions to obtain crude acetic acid distillates (volume V=153ml, pH=2-3).

[0035] ④The distillation raffinate was cooled to room temperature (25°C), and a small amount of white crystals were still completely precipitated, which was obtained by suction filtration under reduced pressure (NH 4 ) 2 SO 4 White crystals (mass is 14.42g), combined with the above crystals, weighed dry (NH 4 ) 2 ...

Embodiment 2

[0044] ①Take 175ml of waste water, concentrate it by distillation under reduced pressure with a rotary evaporator, and heat at 60°C to obtain 70ml of distillate and 95ml of concentrate.

[0045] ②Continue feeding 35.87ml of ammonia gas into the distillate, and after reaching saturation, it can be reused for the neutralization reaction in ammonia water in the acephate production process.

[0046] ③ Slowly add concentrated H to the concentrated solution under stirring 2 SO 4 (18.4mol / l) 12ml (0.2208mol) until the pH is 4, and the reaction temperature is controlled below 50°C.

[0047] ④ Suction filtration after cooling to room temperature completely, obtain the white crystal (NH 4 ) 2 SO 4 , the quality is 45.96g, and the recovery rate can reach 161%. The recovery rate is more than 100%, which is due to the concentration of waste water, making (NH 4 ) 2 SO 4 The separation of crystals is difficult, and the (NH 4 ) 2 SO 4 There are pesticide residues and a lot of water...

Embodiment 3

[0051] ①Take 175ml of waste water, concentrate it by distillation under reduced pressure with a rotary evaporator, and heat at 60°C to obtain 45ml of distillate and 123ml of concentrate.

[0052] ②Continue to feed 23ml of ammonia gas into the distillate until it reaches saturation, and then reuse it for the neutralization reaction in ammonia water in the acephate production process.

[0053] ③ Slowly add concentrated H to the concentrated solution under stirring 2 SO 4 (18.4mol / l) 12ml (0.2208mol) to pH 4, reflux with condensation and control the reaction temperature below 50°C.

[0054] ④ Suction filtration after cooling to room temperature completely, obtain white crystal (NH 4 ) 2 SO 4 , the quality is 29.15g, and the recovery rate can reach 100%.

[0055] ⑤ The filtrate is distilled under reduced pressure with a rotary evaporator to obtain 22 ml of crude acetic acid, and use 0.1mol L -1 NaOH standard solution was used to titrate acetic acid, and the measured molar co...

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PUM

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Abstract

The invention discloses a method for treating wastewater produced by using an ammonia neutralization method to manufacture acephate, which comprises the following steps: (1) sulphuric acid is added into the wastewater which is produced by using the ammonia neutralization method to manufacture the acephate to pH less than or equal to 5; reaction temperature is controlled below 50 DEG C; white crystal is separated; (2) by carrying out solid-liquid separation of the reaction product in the step (1), solid-phase white ammonium sulfate crystal is obtained; (3) by distilling liquid-phase reaction product left by the step (2), acetate solution is separated; (4) raffinate obtained from the step (3) is returned to the original system of compounding and extracting acephate, or is carried out burning treatment.The treatment method of the invention can greatly reduce cost for treating the wastewater of manufacturing the acephate and simultaneously realize efficient recycle and reuse by recycling the acetate in a way of industrial acetic acid with a recycling rate of 50 percent; and recycling ammonium in a way of ammonium sulfate chemical fertilizer with a recycling rate of 95 percent.

Description

technical field [0001] The invention relates to a method for effectively treating waste water produced by acephate production, in particular to a method for treating waste water produced by neutralization with ammonia water, so that the ammonium acetate in the waste water can be completely recovered, and then the remaining pesticides can be recovered After separation, the residues and intermediates re-participate in the synthesis and extraction of acephate or incinerate. Background technique [0002] Acephate (acephate), the chemical name is O, S-dimethyl-N-acetylphosphoramidothiolate (O, S-dimethyl-N-acetylphosphoramidothiolate), commonly known as acephate, is the acetyl of methamidophos chemical derivatives. It not only has the superior efficacy of methamidophos, but also is an environmentally friendly, high-efficiency, low-toxicity, low-residue broad-spectrum organophosphorus insecticide. Three new post-treatment processes are used in the production of acephate: extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/58C02F1/04C01C1/24C07C53/08
Inventor 王敏姚思德马红娟
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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