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Method for catalytic wet oxidation treatment of high concentration cymoxanil wastewater

A technology for catalytic wet oxidation and wet oxidation, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water treatment, etc. The processing effect can be guaranteed, the floor space is small, and the degree of automation is high.

Pending Publication Date: 2019-03-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The COD of cymoxanil wastewater is as high as hundreds of thousands to hundreds of thousands, with high salt content, dark color, strong odor, and poor biodegradability. Generally, conventional biological methods, Fenton methods, ozone methods, etc. are difficult to treat, and incineration The processing cost is too high

Method used

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  • Method for catalytic wet oxidation treatment of high concentration cymoxanil wastewater
  • Method for catalytic wet oxidation treatment of high concentration cymoxanil wastewater
  • Method for catalytic wet oxidation treatment of high concentration cymoxanil wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The 4t / h cymoxanil mother liquor passes twice through the first reaction tower (Φ800mm﹡10000mm) filled with 4.5t inert packing (V (zirconium dioxide): V (sponge titanium) = 4:1) for catalytic wet oxidation treatment , the reaction conditions are as follows: adjust the raw water to pH=2.0 with concentrated sulfuric acid and add 1000mg / L manganese nitrate solution (calculated as manganese ions), reaction temperature=270°C, reaction pressure=7.0MPa, LHSV=1h -1 . The water from the two CWAO reactions is distilled under the condition of a vacuum of 0.085MPa to keep the water sample slightly boiling to evaporate the condensed water, and the condensed water enters the heterogeneous catalytic wet oxidation reaction tower (the second reaction tower) (Φ800mm﹡9000mm) for treatment, in which the tower There are 4t catalysts inside (zirconium dioxide loading is 3wt.% ruthenium + 1wt.% palladium), at reaction temperature = 240°C, reaction pressure = 6.0MPa, LHSV = 1h -1 Under the co...

Embodiment 2

[0022] The 4t / h cymoxanil mother liquor passed twice through the first reaction tower (Φ800mm*10000mm) filled with 4.5t inert packing (V (zirconium dioxide): V (titanium sponge) = 4:1) for catalytic wet oxidation treatment, The reaction conditions are as follows: Use concentrated sulfuric acid to adjust the pH of the raw water to 4.0, then add a homogeneous catalyst copper sulfate solution 1000 mg / L (calculated as copper ions), reaction temperature = 200 ° C, reaction pressure = 4.0 MPa, LHSV = 1h -1 . The water from the two CWAO reactions is distilled under the condition of a vacuum of 0.085MPa to keep the water sample slightly boiling to evaporate the condensed water, and the condensed water enters the heterogeneous catalytic wet oxidation reaction tower (the second reaction tower) (Φ800mm﹡9000mm) for treatment, in which the tower Equivalent volumes of two catalysts are installed in total 4t (3wt.% ruthenium + 1wt.% palladium loaded on zirconia and 1wt.% lanthanum + 2wt.% pa...

Embodiment 3

[0028] The 4t / h cymoxanil mother liquor passed twice through the first reaction tower (Φ800mm*10000mm) filled with 4.5t inert packing (V (zirconium dioxide): V (titanium sponge) = 4:1) for catalytic wet oxidation treatment, The reaction conditions are as follows: add 1000 mg / L of homogeneous catalyst ferric nitrate (calculated as iron ions) to the raw water, reaction temperature = 250°C, reaction pressure = 7.0MPa, LHSV = 1h -1 . The water from the two CWAO reactions is distilled under the condition of a vacuum of 0.085MPa to keep the water sample slightly boiling to evaporate the condensed water, and the condensed water enters the heterogeneous catalytic wet oxidation reaction tower (the second reaction tower) (Φ800mm﹡9000mm) for treatment, in which the tower Equivalent volumes of two catalysts are housed in a total of 4t (3%wt. ruthenium+1wt.% palladium loaded on zirconia and 1wt.‰ platinum+2wt.% rhodium loaded on titania), at reaction temperature=240°C, reaction pressure=6....

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Abstract

The invention relates to a catalytic wet oxidation method for treating industrial organic wastewater, in particular to a method for treating high concentration cymoxanil wastewater. By adopting a process of treatment by a homogeneous reactor twice and connecting the homogenous reactor to a multiphase reaction tower, high concentration wastewater which is not diluted can be directly treated, so that one tower is multipurpose, the occupied area and the investment are reduced, and both economical benefit and environment benefit are improved.

Description

technical field [0001] The invention relates to a catalytic wet oxidation method for treating industrial organic waste water, especially for treating high-concentration cymoxanil waste water. Background technique [0002] Cymoxanil is a high-efficiency, low-toxic fungicide for plants. The wastewater generated from the production of cymoxanil has complex components, mainly including chloroacetic acid, acetic acid, sodium chloride, ethyl urea, cyanoacetyl ethyl urea, sodium methanesulfonate, cymoxanil, etc. The COD of cymoxanil wastewater is as high as hundreds of thousands to hundreds of thousands, with high salt content, dark color, strong odor, and poor biodegradability. Generally, conventional biological methods, Fenton methods, ozone methods, etc. are difficult to treat, and incineration The processing cost is too high. Catalytic wet oxidation treatment of cymoxanil wastewater is relatively economical and can achieve ideal treatment effect. (Experimental research on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/38
CPCC02F1/04C02F1/725C02F1/74C02F9/00C02F2101/38C02F2301/08
Inventor 孙承林王维李先如卫皇曌孙文静于杨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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