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Preparation method of composite adsorption purifying agent

A composite adsorption and purification agent technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of waste catalysts not being effectively used, catalyst waste, resource waste, etc. Effects of reuse, no secondary pollution, and resource saving

Inactive Publication Date: 2013-05-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] As we all know, vinyl acetate is one of the organic chemical raw materials with the largest output in the world. Activated carbon loaded with zinc acetate is needed as a catalyst in the production process of vinyl acetate. These catalysts will lose their activity after a period of use, resulting in a large amount of catalyst waste.
The spent catalyst contains about 25% zinc acetate, which is an important raw material for the production of zinc oxide. The deactivated activated carbon can also be regenerated after heat treatment, but due to the lack of suitable treatment methods and means, these spent catalysts have not been effectively utilized, not only It causes a waste of resources and poses a threat to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Wash 25g of spent catalyst produced during the production of vinyl acetate (containing 20-25% by mass of zinc acetate) with water to remove impurities, then place it in an oven and dry it at 100°C for 3 hours;

[0028] (2) Place the material in step (1) in a microwave tube heating furnace, pass in protective gas nitrogen, and heat up to 750°C with microwave heating at a rate of 15°C / min; then stop feeding in protective gas, and simultaneously pass in Activated with 500ml / min carbon dioxide gas for 35min, then cooled to room temperature, and dried to obtain a composite adsorption purifier with a specific surface area of ​​1156m 2 / g, the yield was 65.3%.

[0029] Add 0.7 g of the prepared composite adsorption purifier to 200 mL of direct vermilion solution with a concentration of 40 mg / L, and stir at a constant temperature of 25°C to reach equilibrium. After 295 minutes, the decolorization rate of direct vermilion reaches 91%.

Embodiment 2

[0031] (1) Wash 25g of spent catalyst (containing 20-25% by mass of zinc acetate) produced during the production of vinyl acetate with water to remove impurities, then place it in an oven and dry it at 110°C for 3 hours;

[0032] (2) Place the material in step (1) in a microwave tube heating furnace, pass in protective gas nitrogen, and heat up to 800 °C with microwave heating at a rate of 18°C / min; then stop feeding in protective gas, and simultaneously pass in Activated with 600ml / min carbon dioxide gas for 30min, then cooled to room temperature, and dried to obtain a composite adsorption purifier with a specific surface area of ​​1156m 2 / g, the yield was 65.3%.

[0033] Add 0.7 g of the prepared composite adsorption purifier to 200 mL of direct dark blue solution with a concentration of 40 mg / L, and stir at a constant temperature of 25°C to reach equilibrium. After 280 minutes, the decolorization rate of direct dark blue reaches 93%.

Embodiment 3

[0035] (1) Wash 25g of the spent catalyst produced during the production of vinyl acetate (containing 20-25% by mass of zinc acetate) with water to remove impurities, then place it in an oven and dry it at 120°C for 3 hours;

[0036] (2) Place the material in step (1) in a microwave tube heating furnace, pass in protective gas nitrogen, and heat up to 800 °C with microwave heating at a rate of 20°C / min; then stop feeding in protective gas, and simultaneously pass in Activate the mixed gas of 550ml / mim carbon dioxide gas and 0.5-1.0ml / min water vapor for 40 minutes, then cool to room temperature, and dry to obtain a composite adsorption purifier with a specific surface area of ​​1109m 2 / g, the yield was 54.6%.

[0037] Add 0.7 g of the prepared composite adsorption purifier into 200 mL of direct vermilion solution with a concentration of 40 mg / L, and stir at a constant temperature of 25 °C to reach equilibrium. After 300 min, the decolorization rate of direct vermilion reaches...

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Abstract

The invention provides a preparation method of a composite adsorption purifying agent. The method comprises the following steps of: washing a dead catalyst with water to remove impurities, and drying at the temperature of 100-120 DEG C for three hours; introducing a protective gas, and raising the temperature to 700-900 DEG C by microwave heating; and stopping introducing the protective gas, simultaneously introducing activating gas for activating for 20-40 minutes, cooling to the room temperature, and drying to obtain the composite adsorption purifying agent. The composite adsorption purifying agent has the advantages of rich source, low price, great reduction in the production cost, protection of the environment, saving of resources and realization of recycling. A production method is simpler, is easy to operate, has low energy consumption, contributes to reducing the emission of pollutants in a production process and no secondary pollution. The reaction rate is increased, the reaction time is shortened, and the reaction cost is reduced. A produced ZnO / active carbon composite adsorption purifying agent has ideal effects on the degradation of organic dyes, treatment of heavy metal ions in waste water and photocatalysis sterilization, and plays an important role in comprehensively treating environmental pollution.

Description

technical field [0001] The invention relates to a preparation method of a composite adsorption purification agent, in particular to a preparation method of a composite adsorption purification agent used for degrading direct dyes in dyeing wastewater, and belongs to the technical field of preparation of adsorption purification agents. Background technique [0002] The dye wastewater produced by the printing and dyeing and dye industries is one of the industrial wastewater. This is because the dyes are usually artificially synthesized and have a complex aromatic molecular structure, so the dye molecules are stable and difficult to be biodegraded. If it is not handled properly and discharged into water bodies, it will cause serious water pollution. [0003] In recent years, my country's dye industry has achieved tremendous development. The development of the dye industry has also brought serious environmental pollution problems. Dye wastewater entering the water body will not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
Inventor 曲雯雯金雯彭金辉张利波张世敏张泽彪巨少华
Owner KUNMING UNIV OF SCI & TECH
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