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Catalytic oxidation catalyst, preparation method thereof, and advanced treatment method of organic matters in MDI brine

A catalytic oxidation and advanced treatment technology, applied in the fields of oxidized water/sewage treatment, organic compound/hydride/coordination complex catalyst, special compound water treatment, etc. High load efficiency and load stability, the effect of improving removal efficiency

Active Publication Date: 2020-02-04
WANHUA CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a catalytic oxidation catalyst and a preparation method thereof, and an advanced treatment method for organics in MDI brine for the problem of catalyst metal loss when the catalytic oxidation method is used for advanced treatment of organic matter in MDI brine; Adding the catalytic oxidation catalyst of the present invention to MDI salt water can not only effectively improve the treatment effect of salt water, but also reduce or even avoid the loss of metal in the catalyst while ensuring the improvement of the catalytic oxidation effect

Method used

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  • Catalytic oxidation catalyst, preparation method thereof, and advanced treatment method of organic matters in MDI brine

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0085] Preparation Example 1 (preparation of 3# catalyst):

[0086] TiO 2 Sample 20g is placed in the impregnating bottle, carries out vacuum pretreatment, and the time of vacuum pretreatment is 40min, and vacuum degree is 97.0KPa (absolute pressure); 2 10.0mL of methanol solution containing EG-CholineCl-FeCl with a concentration of 0.30g / mL 3 Add 6.65mL of methanol solution of 10wt% methanol to prepare an impregnation solution with a total volume of 30mL. Then the above impregnation solution was added to the TiO 2 Vacuum impregnated bottle of carrier and mix well, TiO 2 The carrier was impregnated in an excess volume of impregnating solution. After impregnating for 60 minutes, the impregnated product was taken out and dried in an oven at 120°C for 2h, and then calcined in a muffle furnace at 300°C for 4h to obtain 3# catalyst.

[0087] In the obtained 3# catalyst, with carrier TiO 2 The weight is 1 meter, EG-CholineCl-NiCl 2 The content percentage is 10.0wt%, EG-Choline...

preparation Embodiment 2

[0088] Preparation Example 2 (preparation of 4# catalyst):

[0089] TiO 2 Sample 20g is placed in the impregnating bottle, carries out vacuum pretreatment, and the time of vacuum pretreatment is 10min, and vacuum degree is 96.0KPa (absolute pressure); 2 1.0mL methanol solution containing EG-CholineCl-FeCl with a concentration of 0.15g / mL 3 Add 1.4mL of the methanol solution of 1.4mL to the methanol aqueous solution with a methanol concentration of 10wt%, to prepare an impregnation solution with a total volume of 20mL. Then the above impregnation solution was added to the TiO 2 Vacuum impregnated bottle of carrier and mix well, TiO 2 The carrier was impregnated in an excess volume of impregnating solution. After impregnating for 240min, the impregnated product was taken out and dried in an oven at 150°C for 5h, and then calcined in a muffle furnace at 400°C for 5h to obtain 4# catalyst.

[0090] In the resulting 4# catalyst, with carrier TiO 2 The weight is 1 meter, EG-Cho...

preparation Embodiment 3

[0091] Preparation Example 3 (preparation of 5# catalyst):

[0092] TiO 2 Sample 20g is placed in the impregnating bottle, carries out vacuum pretreatment, and the time of vacuum pretreatment is 30min, and vacuum degree is 96.0KPa (absolute pressure); 2 4.0mL methanol solution containing EG-CholineCl-FeCl with a concentration of 0.15g / mL 3 Add 8.0mL of methanol solution of 10wt% methanol to prepare an impregnating solution with a total volume of 20mL. Then the above impregnation solution was added to the TiO 2 Vacuum impregnated bottle of carrier and mix well, TiO 2 The carrier was impregnated in an excess volume of impregnating solution. After impregnating for 60 minutes, the impregnated product was taken out and dried in an oven at 90°C for 3h, and then calcined in a muffle furnace at 350°C for 4h to obtain 5# catalyst.

[0093] In the resulting 5# catalyst, the carrier TiO 2 The weight is 1 meter, EG-CholineCl-NiCl 2 The content percentage is 4.0wt%, EG-CholineCl-FeCl...

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Abstract

The invention belongs to the technical field of wastewater treatment in chemical engineering and environmental engineering, and relates to a catalytic oxidation catalyst, a preparation method thereof,and an advanced treatment method of organic matters in MDI brine. The catalyst comprises a carrier and an active component, the carrier is titanium dioxide, and the active component is an organic neutral ligand-metal complex ionic liquid. The advanced treatment method comprises the following steps: (1) adjusting the pH value of the MDI brine, and adding an oxidant to carry out treatment; and (2)contacting the treated MDI obtained in step (1) with a catalytic oxidation catalyst to carry out a catalytic oxidation reaction so as to obtain advanced treated brine. The catalyst can reduce or evenavoid the loss of metal in the catalyst while ensuring the improvement of the catalytic oxidation effect; and the advanced treatment method has the advantages of simplicity, easiness in implementation, high treatment efficiency, and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment in chemical engineering and environmental engineering, and more specifically relates to a catalytic oxidation catalyst and a preparation method thereof, and a method for advanced treatment of organic matter in diphenylmethane diisocyanate (hereinafter referred to as MDI) brine. Background technique [0002] During the condensation reaction of the MDI device, a large amount of caustic soda and pure water are usually used to neutralize and wash the intermediate product. During this process, a large amount of neutralized brine and washing water will be produced. After mixing the neutralized brine and washing water in the early stage, it will be extracted, After pretreatment by stripping, it is sent to chlor-alkali treatment after chemical oxidation and adsorption. Now, in order to reduce the amount of brine and increase the salt concentration, the neutralized brine and washing water have...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/02C02F1/72C02F1/76C02F101/34C02F101/38
CPCB01J31/2217B01J31/0292C02F1/725C02F1/766B01J2531/842B01J2531/847C02F2305/023C02F2101/38C02F2101/34C02F2101/345C02F2209/20C02F2209/10C02F2209/16
Inventor 范珍龙张宏科高学顺曾凡雪王俊俊周波衡华李永锋邢津铭
Owner WANHUA CHEM GRP CO LTD
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