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Extracting agent and method for treating thiamethoxam production wastewater by using extracting agent

A technology of extractant and thiamethoxam, which is applied in the field of extractant and its use in the treatment of thiamethoxam production wastewater, can solve the problems of affecting wastewater treatment efficiency, increasing wastewater treatment costs, damage, etc., to avoid inorganic salts from clogging equipment, and improve Wastewater treatment efficiency, effect of reducing wastewater treatment cost

Active Publication Date: 2019-07-30
河北德瑞化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems such as the waste water treatment process produced in the existing thiamethoxam synthesis process, the waste water treatment equipment is easily blocked and damaged, which affects the waste water treatment efficiency, reduces the purity of DMF recovery, and increases the cost of waste water treatment. The present invention provides an extraction Agent and its method for treating thiamethoxam production wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An extractant consisting of chloroform and o-sec-butylphenol in a mass ratio of 3:1.

[0023] Utilize this extraction agent to process the method for thiamethoxam production waste water, comprise the following steps:

[0024] Step 1. Add 1 ton of thiamethoxam production wastewater (containing chlorinating agent, DMF, tar polymer and trace organic solvent) into the reaction kettle, add 0.5 ton of extractant at the same time, stir at 800r / min for 20min, and let stand for 30min to separate layers , separating the upper water phase and the lower oil phase;

[0025] Step 2, sending the separated water phase into a three-effect evaporator for water and salt separation, and separating to obtain water and potassium chloride;

[0026] Step 3: Heat the separated oil phase to 83°C, distill to separate chloroform and a small amount of organic solvent; then heat to 153°C, distill and separate DMF; continue heating to 227°C to distill and separate o-sec-butylphenol. The recovered a...

Embodiment 2

[0029] An extractant consisting of chloroform and o-sec-butylphenol in a mass ratio of 5:1.

[0030] Utilize this extraction agent to process the method for thiamethoxam production waste water, comprise the following steps:

[0031] Step 1. Add 1 ton of thiamethoxam production wastewater (containing chlorinating agent, DMF, tar polymer and trace organic solvent) into the reaction kettle, add 0.8 tons of extractant at the same time, stir at 700r / min for 15min, and let stand for 30min to separate layers , separating the upper water phase and the lower oil phase;

[0032] Step 2, sending the separated water phase into a three-effect evaporator for water and salt separation, and separating to obtain water and potassium chloride;

[0033] Step 3. Heat the separated oil phase to 84°C, distill to separate chloroform and a small amount of organic solvent; then heat to 154°C, distill and separate DMF; continue heating to 228°C to distill and separate o-sec-butylphenol. The recovered ...

Embodiment 3

[0036] An extractant consisting of chloroform and o-sec-butylphenol in a mass ratio of 7:3.

[0037] Utilize this extraction agent to process the method for thiamethoxam production waste water, comprise the following steps:

[0038] Step 1. Add 1 ton of thiamethoxam production wastewater (containing chlorinating agent, DMF, tar polymer and trace organic solvent) into the reaction kettle, add 0.5 ton of extractant at the same time, stir at 600r / min for 20min, and let stand for 30min to separate layers , separating the upper water phase and the lower oil phase;

[0039] Step 2, sending the separated water phase into a three-effect evaporator for water and salt separation, and separating to obtain water and potassium chloride;

[0040] Step 3: Heat the separated oil phase to 85°C, distill to separate chloroform and a small amount of organic solvent; then heat to 155°C, distill and separate DMF; continue heating to 230°C to distill and separate o-sec-butylphenol. The recovered a...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to an extracting agent and a method for treating thiamethoxam production wastewater by using the extracting agent. The extracting agent is prepared from chloroform and o-sec-butylphenol, wherein the mass ratio of the chloroform to the o-sec-butylphenol is (5-7):(1-3). The extracting agent and the wastewater treatment method have the advantages that a tar polymer can be completely separated from the wastewater, and extract liquid is distilled and separated, so that high-purity DMF is obtained, the extracting agent separated by distillation can be recycled, and the situation that inorganic salt clogs equipment during wastewater treatment is also avoided, so that the wastewater treatment efficiency is improved, the operation is simple, the cost is low, the environment is protected, the efficiency is high, and the extracting agent can be popularized and used.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an extractant and a method for treating wastewater produced by thiamethoxam using the extractant. Background technique [0002] Thiamethoxam is a second-generation neonicotinoid insecticide with a new structure, high efficiency and low toxicity, chemical name: 3-(2-chloro-1,3-thiazol-5-ylmethyl)-5-methyl- 1,3,5-Oxadiazin-4-ylidene (nitro)amine, whose mechanism of action is similar to that of imidacloprid, can selectively inhibit nicotinic acid acetylcholinesterase receptors in the insect central nervous system, thereby blocking insect central nervous system The normal conduction of the insecticide causes paralysis and death of pests. It not only has contact killing, stomach poisoning, and systemic activity, but also has better safety, wider insecticidal spectrum, fast action speed, and long-lasting effect. Better alternatives to organophosphate, carbamate, organochl...

Claims

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Application Information

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IPC IPC(8): B01D11/00C02F1/26C02F101/34C02F101/36C02F101/38C02F103/36
CPCB01D11/00C02F1/26C02F2101/34C02F2101/36C02F2101/38C02F2103/36
Inventor 柳海营史三冬薛晨辉
Owner 河北德瑞化工有限公司
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