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Purifying method of waste brine in glyphosate production

A refining method and waste brine technology, applied in the field of chemical treatment, can solve the problem of high TOC content in brine, and achieve high economic and social benefits

Active Publication Date: 2014-11-26
浙江海禹环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The Chinese invention patent with application number 200910062795.8 discloses a method for nanofiltration separation and comprehensive utilization of glyphosate mother liquor. Three-stage nanofiltration is used to separate glyphosate mother liquor, and the concentrated sodium chloride solution that passes through nanofiltration contains small Molecular organic matter is processed by photocatalytic-chemical oxidation method to prepare brine, which is used as raw material for caustic soda production. This method can realize the comprehensive utilization of glyphosate mother liquor in the treatment of glyphosate wastewater, but the final brine has a high TOC content and needs further treatment Used as raw material for caustic soda production

Method used

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Examples

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Effect test

Embodiment 1

[0026] Take 1L of the light solution obtained by membrane separation of glyphosate mother liquor by glycine method, measure its total phosphorus content 2502mg / L, TOC content 1720mg / L, total nitrogen content 475mg / L, add 1mol / L sodium hydroxide to adjust the waste brine pH value to 6, separated by nanofiltration membrane to remove part of TOC (total organic carbon), total nitrogen and total phosphorus, and the obtained permeate has a removal rate of TOC of 85%, a removal rate of total phosphorus of 92%, and a removal rate of total nitrogen of 55%. . Then adopt the Fenton oxidation method, add H in proportion 2 0 2 solution (0.98mol / L) and FeSO 4 10H 2 0 solution (Fe 2+ Concentration is 0.036mol / L), making H 2 o 2 / Fe 2+ The ratio was 0.5; 80 mg of ozone was introduced and reacted at 30° C. for 1 hour. After the reaction was completed, the total phosphorus removal rate of the salt solution was 99.8%, the total phosphorus content was 0.4 mg / L, and the TOC removal rate was...

Embodiment 2

[0028] Take 1L of the light solution obtained by membrane separation of glyphosate mother liquor by glycine method, measure its total phosphorus content 2502mg / L, TOC content 1720mg / L, total nitrogen content 475mg / L, add 1mol / L sodium hydroxide to adjust the waste brine pH value to 8, separated by nanofiltration membrane to remove part of TOC (total organic carbon), total nitrogen and total phosphorus, the obtained permeate has a removal rate of TOC of 88%, a removal rate of total phosphorus of 94%, and a removal rate of total nitrogen of 60% . Then adopt the Fenton oxidation method, add H in proportion 2 0 2 solution (0.98mol / L) and FeSO 4 10H 2 0 solution (Fe 2+ Concentration is 0.036mol / L), making H 2 o 2 / Fe 2+The ratio was 0.5; 80 mg of ozone was introduced and reacted at 30° C. for 1 hour. After the reaction was completed, the total phosphorus removal rate of the salt solution was 99.7%, the total phosphorus content was 0.45 mg / L, and the TOC removal rate was 95%....

Embodiment 3

[0030] Take 1L of the light solution obtained by membrane separation of glyphosate mother liquor by glycine method, measure its total phosphorus content 2502mg / L, TOC content 1720mg / L, total nitrogen content 475mg / L, add 1mol / L sodium hydroxide to adjust the waste brine pH value to 10, separated by nanofiltration membrane to remove part of TOC (total organic carbon), total nitrogen and total phosphorus, the obtained permeate has a removal rate of TOC of 84%, a removal rate of total phosphorus of 96%, and a removal rate of total nitrogen of 58% . Then adopt the Fenton oxidation method, add H in proportion 2 0 2 solution (0.98mol / L) and FeSO 4 10H 2 0 solution (Fe 2+ Concentration is 0.036mol / L), making H 2 o 2 / Fe 2+ The ratio is 0.5; 80 mg of ozone is introduced and reacted at 30°C for 1 hour. After the reaction, the total phosphorus removal rate of the salt solution is 99.6%, the total phosphorus content is 0.4 mg / L, and the TOC removal rate is 93%. Adsorbed by activa...

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Abstract

The invention discloses a chemical treatment method, and concretely relates to a purifying method of waste brine in a glyphosate production process. The method comprises the following steps: adjusting the total phosphorus content and TOC and total nitrogen L in the waste brine, adjusting the pH value of the waste brine to 6-10, and carrying out nanofiltration membrane separation to obtain a penetrating fluid; processing the penetrating fluid by adopting a catalytic oxidation technology to obtain a first stage salt solution, wherein the catalytic oxidation is one or a combination of more of a Fenton oxidation processes, a hydrogen peroxide active carbon oxidation process, a sodium hypochlorite active carbon oxidation process, an ozone active carbon oxidation process and a chlorine dioxide oxidation process; and adsorbing by adopting an adsorbent to obtain a second stage salt solution, wherein the adsorbent can be one or a combination of more of macro-porous adsorption resin, chelating resin, molecular sieve, silica gel and activated alumina. The method can effectively solve the problems of difficult treatment, difficult us of waste salt as a byproduct and the like, and has very high economic and social benefits.

Description

technical field [0001] The invention relates to a chemical treatment method, specifically a method for refining waste brine in the glyphosate production process, which is applied to the field of waste brine treatment of glycine glyphosate mother liquor, diglyphosate mother liquor and iminodiacetic acid mother liquor. Background technique [0002] Glyphosate wastewater is organic high-concentration heavy metal-containing wastewater discharged from the production of glyphosate powder and water in the chemical and pesticide industry. The main raw materials for glyphosate production include diethanolamine, caustic soda, deionized water, hydrochloric acid, formaldehyde, phosphorus trichloride, 30% liquid caustic soda, heavy metal catalyst, hydrogen peroxide, sodium tungstate, liquid ammonia, ferrous sulfate, etc. Glyphosate wastewater treatment is difficult, and its mother liquor is even more difficult. [0003] Glyphosate is a broad-spectrum herbicide. According to different ra...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/36
Inventor 邱晖谢柏明赵经纬丁国良汪勇方元
Owner 浙江海禹环保科技有限公司
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