Catalyst for treating benzene series organic waste-gas or waste-water by using low temp. and dry method, prepn. method and application thereof

An organic waste gas, dry treatment technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of large loss rate of activated carbon adsorption capacity and increase treatment cost , activated carbon loss and other issues, to achieve the effect of low cost, saving industrial water, and small equipment footprint

Inactive Publication Date: 2006-06-28
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the thermal regeneration process, activated carbon after adsorption saturation should be treated at a high temperature of 800-850oC, which consumes a lot of energy; at the same time, high temperature operation makes the adsorption capacity loss rate of activated carbon large, and the adsorption capacity loss of activated carbon is 5-15% every time regeneration is performed; in addition , high-temperature operation also prevents activated carbon from being regenerated in situ, requiring a specific regeneration device, thereby increasing the treatment cost and causing a certain amount of activated carbon loss during transportation; finally, the pollutants desorbed during the heating process need to be post-treated. complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of Cu5 / AC. catalyst:

[0015] Get 100ml of copper nitrate solution of 0.78mol / l, and make 100 grams of 40-60 mesh specific surface area 800m 2 The activated carbon particles per gram were poured into the impregnating solution and stirred, left at room temperature for 4 hours, dried at 110°C for 6 hours, then calcined at 250°C under the protection of argon for 12 hours, and naturally cooled to room temperature to prepare catalyst A. The weight of metal components is: Cu 5%, activated carbon 95%, marked as Cu5 / AC.

[0016] Cu5 / AC Adsorption - Use of Catalyst:

[0017] Pass 50ml of organic wastewater containing 100ppm ethylbenzene and 100ppm sodium benzoate through an adsorption column equipped with 0.5g Cu5 / AC adsorption-catalyst, discharge the purified wastewater after the adsorption is over, and dry the Cu5 / AC that adsorbs ethylbenzene and sodium benzoate at normal temperature Adsorption—catalyst; Adsorption to the dried Cu5 / AC—passing oxidizing gas (5% ox...

Embodiment 2

[0020] Preparation of Fe5 / AC catalyst:

[0021] Get 100ml of ferric nitrate solution of 0.89mol / l, make 100 grams of 40-60 mesh specific surface area 1200m 2 The activated carbon particles per gram were poured into the impregnating solution and stirred, left at room temperature for 6 hours, dried at 110°C for 12 hours, then calcined at 300°C under the protection of argon for 24 hours, and naturally cooled to room temperature to prepare catalyst B. The weight of the metal component is: Fe 5%, activated carbon 95%, marked as Fe5 / AC.

[0022] Fe5 / AC adsorption - use of catalyst:

[0023] Pass 100ml of organic wastewater containing 100ppm ethylbenzene and 100ppm sodium benzoate through an adsorption column equipped with 0.5g Fe5 / AC adsorption-catalyst, discharge the purified wastewater after the adsorption is over, and dry the Fe5 / AC adsorption of toluene and sodium benzoate at normal temperature - Catalyst; Adsorption of Fe5 / AC after drying - Oxidizing gas (5% oxygen) is passed...

Embodiment 3

[0026] Preparation of V5 / AC catalyst:

[0027] The specific surface area of ​​40-60 mesh is 500m 2 Activated carbon particles per g are impregnated with a mixed solution of ammonium metavanadate and oxalic acid (the concentration of ammonium metavanadate is 0.043g / ml), placed at room temperature for 6 hours, dried at 110°C for 24 hours, and then successively in an inert atmosphere Calcination and oxidation in air, naturally cooled to room temperature to make catalyst C, the weight of metal components in catalyst C is: V 5%, activated carbon is 95%, marked as V5 / AC.

[0028] V5 / AC Adsorption - Use of Catalyst:

[0029] Pass 10L of organic waste gas containing 5ppm toluene, 5ppm ethylbenzene and 5ppm xylene through the bed layer equipped with 0.5g V5 / AC adsorption-catalyst at room temperature, V5 / AC adsorption-catalyst adsorbs toluene, ethylbenzene and xylene; Adsorption - Oxidizing gas (5% oxygen) is introduced into the catalyst with a space velocity of 1000h -1 , and raise ...

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Abstract

A catalyst for treating the benzene contained organic waste gas and the benzene and benzoate contained sewage by low-temp dry method contains metal (1-10 Wt%) chosen from Cu, Fe, V and Co, and activated carbon (90-99 Wt%) as carrier. Its application includes such steps as passing said waste gas or sewage through said catalyst while adsorbing, drying, filling oxidizing gas and reaction.

Description

technical field [0001] The invention belongs to an adsorption-catalyst and its application method, in particular to an adsorption-catalyst with a transition metal as an active component, a preparation method and a use method. Background technique: [0002] A large amount of industrial wastewater containing toluene, xylene, ethylbenzene and benzoates is discharged from petroleum, chemical and coking production. The EPA lists toluene, ethylbenzene and xylenes (BTEX) as priority pollutants, which are extremely toxic to various life forms. These pollutants can be found in contaminated groundwater. At the same time, toluene, xylene and ethylbenzene belong to volatile organic pollutants (VOCs), which have a very strong toxic effect on organisms, so these waste gases and waste water must be treated before discharge to reduce environmental pollution. However, toluene, xylene, ethylbenzene and benzoate are pollutants that are difficult to biodegrade, and it is difficult for general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J23/745B01J23/75B01J23/22B01J27/20B01J37/02B01D53/72C02F1/28C02F1/72
Inventor 刘振宇雷智平杨建丽刘平光
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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