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Methylamine wastewater pretreatment catalyst as well as preparation method thereof and application thereof in methylamine wastewater treatment

A wastewater treatment and catalyst technology, applied in the direction of oxidized water/sewage treatment, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems that the biochemical ability and toxicity have not been effectively improved, and achieve high catalytic activity and stability , biochemical ability and toxicity improvement, the effect of increasing biochemical ability

Active Publication Date: 2015-01-21
HENAN HONGKANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, most of the methylamine wastewater containing high concentrations of methanol and ammonia nitrogen stays at the stage of how to treat it, and its biochemical ability and toxicity have not been effectively improved. For this problem, no effective solution has been proposed so far.

Method used

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  • Methylamine wastewater pretreatment catalyst as well as preparation method thereof and application thereof in methylamine wastewater treatment
  • Methylamine wastewater pretreatment catalyst as well as preparation method thereof and application thereof in methylamine wastewater treatment
  • Methylamine wastewater pretreatment catalyst as well as preparation method thereof and application thereof in methylamine wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take the crushed specific surface area as 200-300m 2 5kg of magnetite / g was roasted at 800°C for 3h, and after cooling to 25°C, the magnetite was added with 30wt% nano-TiO 2 solution (impregnation solution), after 24 hours of drying at 120 ° C, the magnetite and nano-TiO 2 The mass ratio is 4:1, followed by calcination at 1200°C for 6h.

[0013] The prepared catalyst is molded by extrusion process and loaded into the catalytic oxidation reaction tower. The amount of the catalyst added is 1 / 2 of the volume of the catalytic oxidation reaction tower. After mixing the methylamine wastewater and hydrogen peroxide, pump it into the catalytic oxidation reaction tower. In the reaction tower, after staying in the tower for 60 minutes, it can be taken out of the tower, and conventional biochemical treatment can be carried out after the tower is taken out.

[0014] Analyze the water quality before and after entering the tower, and the analysis and test results are shown in the t...

Embodiment 2

[0018] Take the crushed specific surface area as 250-300m 2 5kg of magnetite / g was roasted at 700°C for 5h, and after cooling to room temperature (25°C), the magnetite was added with 30wt% nano-TiO 2 solution (impregnating solution), after 12 hours of drying at 105 ° C, the magnetite and nano-TiO 2 The mass ratio is 4:1, followed by calcination at 1200°C for 6h.

[0019] The prepared catalyst is shaped by extruding process and loaded into the catalytic oxidation reaction tower. The amount of the catalyst added is 2 / 3 of the volume of the catalytic oxidation reaction tower. After the methylamine wastewater and hydrogen peroxide are combined, the catalytic oxidation In the reaction tower, after staying in the tower for 40 minutes, it can be taken out of the tower, and conventional biochemical treatment can be carried out after the tower is taken out.

[0020] Analyze the water quality before and after entering the tower, and the analysis and test results are shown in the table...

Embodiment 3

[0024] Take the crushed specific surface area as 200-300m 2 5kg of magnetite / g was roasted at 800°C for 5h, and after cooling to room temperature (28°C), the magnetite was added with 35wt% nano-TiO 2 solution (impregnating solution), place it for 12 hours and then dry it at 120°C to make magnetite and nano-TiO 2 The mass ratio is 3:1, followed by firing at 1000°C for 7h.

[0025] The prepared catalyst is shaped by extruding process and loaded into the catalytic oxidation reaction tower. The amount of the catalyst added is 3 / 5 of the volume of the catalytic oxidation reaction tower. After mixing the methylamine wastewater and hydrogen peroxide, pump it into the catalytic oxidation reaction tower. In the reaction tower, after staying in the tower for 30 minutes, it can be taken out of the tower, and conventional biochemical treatment can be carried out after the tower is taken out.

[0026] Analyze the water quality before and after entering the tower, and the analysis and tes...

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Abstract

The invention discloses a method for preparing a methylamine wastewater pretreatment catalyst. The method comprises the following steps: roasting crushed magnetite with the specific surface area of 200-300 m<2> / g for 3-5 hours under 600-800 DEG C, cooling to 20-28 DEG C, then adding the magnetite in a 30-40wt% nanometer TiO2 impregnating solution and standing for 12-24 hours, subsequently drying under 105-120 DEG C until the mass ratio of the magnetite to nanometer TiO2 is (3-4) to 1, and finally roasting for 6-8 hours under 1000-1200 DEG C to obtain the methylamine wastewater pretreatment catalyst. The catalyst prepared according to the method has the relatively high catalytic activity and stability, and can effectively catalyze and decompose hydrogen peroxide to produce hydroxyl radicals, and thus organic pollutants in waste water can be degraded, the structure of organic pollutants in methylamine wastewater can be changed, and the biochemical ability of the catalyst can be effectively improved; meanwhile, the catalyst produced according to the method has the magnetism, is easily recovered, repeatedly utilized and environmentally-friendly, and can be produced and applied in large scale.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment catalysts, and in particular relates to a methylamine wastewater pretreatment catalyst, a preparation method thereof and an application of the catalyst. Background technique [0002] Methylamine, a hydrocarbyl derivative of ammonia, is an important aliphatic amine. Under catalytic conditions, the raw materials such as methanol and liquid ammonia are deaminated, extracted, dehydrated, and separated to obtain methylamine products of different structures: monomethylamine (MMA), dimethylamine (DMA) and trimethylamine (TMA). Methylamine is mainly used in the production of solvents dimethylformamide (DMF), dimethyl ether (DME), surfactants, insecticides, water treatment agents, ion exchange resins, etc., and is one of the most basic chemical raw materials. [0003] With the rapid development of China's chemical industry, the demand for methylamine is increasing, and it has become one of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/72
Inventor 汤广斌李丰登孙长城桑书梅邓欢李伟萍韩娟
Owner HENAN HONGKANG ENVIRONMENTAL PROTECTION TECH
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