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Recycling method for inorganic salt in wastewater of phenoxy carboxylic acid weed killer

A technology of phenoxycarboxylic acids and a treatment method, which is applied in the field of resource treatment of inorganic salts in industrial waste water, can solve problems such as poor treatment, destruction, environmental pollution, etc., achieve outstanding environmental protection and social benefits, and reduce environmental pollution , the effect of improving the purity

Active Publication Date: 2014-04-30
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the invention is simple, and realizes high-purity recovery of inorganic salts in salt-containing industrial wastewater, especially high-salt industrial wastewater, and the obtained inorganic salts can be reused, avoiding resource waste and environmental damage, and solving high The treatment of salt industry wastewater is difficult, but this method still has certain shortcomings, that is, in the process of inorganic salt purification, toxic gases (such as dioxins, etc.) will be produced during the high-temperature carbonization process. These toxic gases are not well treated and discharged into environmental pollution in the air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 2,4-D production wastewater, evaporate the wastewater through MVR to obtain industrial salt, take 1000Kg of industrial salt obtained, detect 90% sodium chloride content, 9.03% moisture, and 0.95% TOC, and put it into the tubular pyrolysis reaction In the furnace, under the isolation of oxygen, it is thermally cracked at 380°C for 10 minutes. The organic gas produced is passed into the combustion device and stays at 1000°C for 2 seconds. High-temperature carbonization for 15 minutes to obtain high-purity salt with a sodium chloride content of 99.94% and a TOC content of 0.003%. Discharge after quenching to below 200°C.

[0032] Take 300Kg of the high-purity salt obtained in the above steps, and make 1000L brine. The obtained brine is used as brine for ion membrane electrolysis, and caustic soda, chlorine and hydrogen are produced through electrolysis, which can be reused in production.

Embodiment 2

[0034] Take 2,4-D production wastewater, and evaporate the wastewater through three-effects to obtain industrial salt. Take 1000Kg of the industrial salt obtained, and detect that the potassium chloride content is 92.2%, the water content is 6.74%, and the TOC is 1.04%. Put it into the rotary furnace for pyrolysis In the reactor, under the isolation of oxygen, it is thermally cracked at 400°C for 8 minutes, and the organic gas produced is passed into the combustion device, and stays at 1000°C for 3 seconds, and the remaining solid is thrown into the rotary kiln. After carbonization for 30 minutes, high-purity salt can be obtained. The content of sodium chloride is 99.96%, and the content of TOC is 0.003%. Discharge after reaching below 200°C.

[0035] Get 305Kg of high-purity salt obtained in the above steps, and make 1000L brine, and the obtained brine is used as brine for ion-exchange membrane electrolysis, and caustic soda, chlorine and hydrogen are produced by electrolysis...

Embodiment 3

[0037] Take the 2-methyl-4-chlorine production wastewater, and evaporate the wastewater through MVR to obtain industrial salt. Take 1000Kg of the obtained industrial salt, detect 91.6% sodium chloride content, 7.3% moisture, and 1.06% TOC, and put it into the bubbling fluidized bed for reaction In the incinerator, under the isolation of oxygen, thermal cracking at 450°C for 15 minutes, the organic gas produced is passed into the secondary combustion chamber, and stays at 1100°C for 2s, and the remaining solids are thrown into the fluidized bed incinerator and ventilated under air. , carbonized at 750°C for 10 minutes to obtain high-purity salt with a sodium chloride content of 99.90 and a TOC content of 0.002%. The gas produced by carbonization is also passed into the second combustion chamber and fully combusted at high temperature together with the thermally cracked organic gas , the exhaust gas generated is rapidly cooled to below 200°C and then discharged.

[0038] Take 31...

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Abstract

The invention discloses a recycling method for inorganic salt in wastewater of a phenoxy carboxylic acid weed killer. The method comprises steps of evaporating and concentrating wastewater so as to obtain solid salt; thermal cracking organic substances in the solid salt into organic gas; allowing the organic gas obtained in thermal cracking to enter a burning device to be fully burned, shock cooling the obtained offgas and discharging; carbonizing the thermal cracked solid salt at a high temperature so as to be further purified to obtain high purity solid salt, and allowing the gas generated in carbonization to enter the burning device to be fully burned. The method has simple steps, is mature, and is applicable to industrial production. By adopting the method, the purity of the inorganic salt is improved, secondary waste difficult to process is not generated, the wastewater is recycled, the problem of treatment of high salt wastewater of the phenoxy carboxylic acid weed killer is effectively solved, and the method has prominent environment protection and social benefits.

Description

technical field [0001] The invention relates to a method for resourceful treatment of inorganic salts in industrial wastewater, in particular to a method for resourceful treatment of inorganic salts in phenoxycarboxylic acid herbicide wastewater. technical background [0002] In the production process of many organic or inorganic chemical products, a large amount of saline wastewater is often produced due to the process requirements, in which the sodium chloride content is higher than 1%, many are more than 10%, and some even reach more than 20%, which is high. The current mature treatment process for salty wastewater and high-salt wastewater is mostly evaporation, which will produce a large amount of by-product waste salt (NaCl). The sodium chloride content of this salt is more than 70%, and it contains a large amount of organic or inorganic impurities. It cannot be directly used as industrial raw material salt, let alone for food or medical use. Most manufacturers pile it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C01D3/04
Inventor 孙国庆李志清凌晓光侯永生姚红霞邹宗加
Owner SHANDONG WEIFANG RAINBOW CHEM
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