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Catalytic wet oxidation pretreatment method of glyphosate production wastewater

A technology for catalyzing wet oxidation and producing wastewater, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., and can solve the problems of high equipment investment and operating costs, high investment and operating costs, and practical application Difficulties and other problems, to achieve the effect of saving investment and operating costs, solving the problem of up-to-standard emissions, and great prospects for industrial application

Active Publication Date: 2015-07-01
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The calcium chloride precipitation method cannot effectively separate organic phosphorus compounds; the micro-electrolysis technology has complex equipment, the treatment effect cannot meet the emission requirements, and industrial scale-up application is difficult; the organic phosphorus decomposition rate of the catalytic alkaline hydrolysis technology is not high, and the COD removal rate is low
[0006] Due to the presence of membrane fouling in membrane separation technology, there is no economical and effective treatment method for the concentrated mother liquor after separation. In addition, problems such as high investment and operating costs also limit the application of membrane technology in this wastewater treatment.
[0007] Although the complex extraction technology can recover part of glyphosate technical, but the recovery phase composition is complex, the glyphosate content is low, it is difficult to use, and there is difficulty in phase separation, and it is difficult for the treated wastewater to meet the total phosphorus discharge target
[0008] Although the wet oxidation technology can realize the effective pretreatment of the wastewater, there are problems such as high reaction temperature (usually above 260°C), high reaction pressure (greater than 6MPa), high equipment investment and operating costs, and some difficulties in practical application.
[0009] In the Glyphosate Forum, "Glyphosate Production Wastewater Treatment Technology Analysis and Research" only mentioned, but did not really disclose the technology of catalytic wet oxidation treatment of glyphosate wastewater, and the COD removal rate was only 75%.

Method used

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  • Catalytic wet oxidation pretreatment method of glyphosate production wastewater
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  • Catalytic wet oxidation pretreatment method of glyphosate production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 2000mL of glyphosate production wastewater from the glycine process, adjust the pH to 9.0 with 1mol / L HC solution, add 0.2g of copper sulfate and 0.4g of zinc nitrate mixed catalyst, stir evenly, and send it into the preheater through a high-pressure metering pump, and the wastewater flow rate is 240ml / h; Adjust the air pressure of the high-pressure steel cylinder to 3MPa through the pressure reducing valve, and the quality controller controls the air flow rate of 690ml / min to mix with the waste water in the preheater, and then send it to the reactor for oxidation reaction after being heated to 230°C by an automatic temperature control electric heating device , the residence time of wastewater in the reactor is 20min, and the treated gas and water mixtures are condensed by the condenser and separated by the gas-liquid separator, and then discharged separately. The water quality analysis results before and after catalytic wet oxidation of wastewater are shown in Tabl...

Embodiment 2

[0032] Take 2000mL of IDA process glyphosate production wastewater, adjust the pH to 8.5 with 1mol / L NaOH solution, add 0.2g of copper sulfate and 0.4g of zinc nitrate, stir evenly, and send it into the preheater through a high-pressure metering pump, and the wastewater flow rate is 240ml / h; The air pressure of the high-pressure steel cylinder is adjusted to 4MPa through the pressure reducing valve, and the quality controller controls the air flow rate of 690ml / min to mix with the waste water in the preheater. After being heated to 220°C by the automatic temperature control electric heating device, it is sent to the reactor for oxidation reaction, and the waste water The residence time in the reactor is 20 minutes. The treated gas and water mixtures are condensed by the condenser and separated by the gas-liquid separator, and then discharged separately. The water quality analysis results before and after catalytic wet oxidation of wastewater are shown in Table 2.

[0033] Table...

Embodiment 3

[0037] Take 2000mL of glyphosate production wastewater from the glycine process, adjust the pH to 9.5 with 1mol / L HCL solution, add 0.4g of copper sulfate and 0.4g of zinc nitrate mixed catalyst, stir evenly, and send it into the preheater through a high-pressure metering pump, and the wastewater flow rate is 240ml / h; Adjust the air pressure of the high-pressure steel cylinder to 4MPa through the pressure reducing valve, and the quality controller controls the air flow rate of 690ml / min to mix with the waste water in the preheater, and then send it to the reactor for oxidation reaction after being heated to 210°C by automatic temperature control. The residence time in the reactor is 20 minutes. The treated gas and water mixtures are condensed by the condenser and separated by the gas-liquid separator, and then discharged separately. The water quality analysis results before and after catalytic wet oxidation of wastewater are shown in Table 3.

[0038] Table 3 Pretreatment resu...

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Abstract

The invention relates to a catalytic wet oxidation pretreatment method of glyphosate production wastewater, comprises the following steps: firstly regulating pH value to be more than 8 and less than 10, adding a multi-component homogeneous catalyst and carrying out oxidative degradation on pollutants in wastewater for 0.3-2 hours by using a continuous catalytic wet oxidation device with air as an oxidizing agent at the reaction temperature of 210-230 DEG.C and the reaction pressure of 2-4MPa, wherein the catalyst is a soluble transition metal salt mixture. By adopting the method for treating the glyphosate production wastewater, the organic phosphorus conversion rate is high, the COD (chemical oxygen demand) removal rate is high, the biodegradability of the wastewater can be improved, and the secondary pollution is avoided. The method has the advantages that the catalyst activity is high, low in cost and easy to get, reaction conditions are relatively mild, and continuous operation is easily implemented; the glyphosate production wastewater can be discharged in standard through the combined process of catalytic wet oxidation pretreatment-routine technical dephosphorization and deamination-biochemistry, and the industrialized application prospect is great.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a catalytic wet oxidation pretreatment method for glyphosate production wastewater. Background technique: [0002] Glyphosate is a high-efficiency, low-toxicity, broad-spectrum herbicide with rapid metabolism and less residue, which meets environmental protection requirements and has a long-term market prospect. With decades of popularization and application, glyphosate has become the world's largest-selling pesticide technical and the fastest-growing herbicide, accounting for 30% of the total herbicide production, surpassing the top 10 sales other than glyphosate. The sum of good active ingredient sales. [0003] At present, there are two main synthetic routes of glyphosate: glycine process and IDA process. The above two glyphosate synthesis routes both produce a large amount of high-concentration (COD>40000mg / L) wastewater, in which the total ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/74C02F9/04
Inventor 董振海李利敏姚慧强李向东
Owner 中国中化股份有限公司
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