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A continuous arsenic removal catalyst for industrial tail gas purification and its preparation method

A technology for industrial exhaust gas and catalyst, which is used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high toxicity of metal ions, limited life of purifiers, and many types of oxidants, so as not to produce secondary The effect of pollution, good control of process conditions and simple preparation process

Active Publication Date: 2018-01-26
BEIJING PEKING UNIV PIONEER TECH
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Problems solved by technology

In 2013, my country's calcium carbide production capacity was 37.9 million tons, the actual output was 22.34 million tons, and the actual by-product calcium carbide tail gas was 8.9 billion m 3 , about 70% of which is used as fuel for calcined lime in conjunction with calcium carbide production, 6% is used as fuel for waste heat boilers, and at least 12% of the tail gas is about 1 billion m 3 The exhaust gas is burned and emptied, which is a waste of energy and also causes some pollution to the environment
At present, there are two main problems with the purifiers for dry arsenic removal: 1) Purifiers prepared by the impregnation method have many types of impregnated metals, and due to the high toxicity of metal ions, there are certain concentrations in industrial production and waste liquid treatment; 2. ) prepared by the arsenic removal agent has a certain adsorption capacity, arsenide needs to be regenerated after penetration, the regeneration process is cumbersome, the efficiency after regeneration is only about 90%, and the life of the purifier is limited
There are many types of oxidants used in wet arsenic removal, and the problem of waste liquid treatment is also faced after the penetration of arsenic hydrogen

Method used

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  • A continuous arsenic removal catalyst for industrial tail gas purification and its preparation method

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Embodiment

[0044] Embodiments specifically adopt the following preparation process conditions to realize the preparation of the above-mentioned continuous arsenic removal catalyst:

[0045] a) The catalyst carrier is prepared by 13X molecular sieve raw powder, its bulk specific gravity is 0.38g / ml, the pore distribution is mainly 0.8-1.5nm, CO 2 The adsorption capacity is 22.5ml / g.

[0046] b) Proportion ratio of catalyst active components: calculated according to the ratio of aqueous solution, Cu 2+ The concentration is 0.3M, 1Kg molecular sieve raw powder needs to add 0.5L Cu(NO3) 2 Solution, add the solution while stirring during the addition process.

[0047] c) In order to increase the dispersion and molding strength of the copper salt during the preparation of the catalyst, high-dispersion aluminum sol needs to be added, and about 0.2L of aluminum sol needs to be added to 1Kg of molecular sieve raw powder.

[0048] d) Forming of the catalyst: Extrusion forming is carried out aft...

Embodiment 1

[0051] Take by weighing 36.24g copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) it is uniformly dissolved, and prepared as 500ml aqueous solution, in order to prevent the hydrolysis of copper nitrate, add 5 drops of nitric acid. Weigh 1Kg of 13X molecular sieve raw powder, mix the prepared solution with the raw powder, add 0.2L of highly dispersed aluminum sol to help molecular sieve forming, and stir evenly. Extrude the material into strands using an extruder. After drying the strips in the shade, put them into an oven and bake them at 120°C for 3 hours, then transfer them to a roasting furnace and bake them at 250°C for 2 hours, and finally get the finished arsenic removal catalyst.

[0052] This catalyst was packed in a fixed bed reactor. The reactor temperature is set at 220°C; the space velocity is set at 10000h -1 ; The reaction pressure is normal pressure. The yellow phosphorus tail gas is prepared by simulating the yellow phosphorus tail gas components in the laboratory, and...

Embodiment 2

[0054] Weigh 51.15g copper chloride (CuCl 2 2H 2 (2), it is uniformly dissolved, and it is prepared as 1L aqueous solution; the 13X molecular sieve former powder of 2Kg is weighed, and the solution is stirred evenly with it, and 0.4L of highly dispersible aluminum sol solution is added during the stirring process, and the stirring is continued until uniform. Extrusion molding is carried out on the extruder. After drying in the shade, it was baked at 120°C for 3 hours, and then fired in a baking furnace at 250°C for 2 hours to obtain a finished arsenic removal catalyst.

[0055] The prepared catalyst was packed in a fixed bed reactor. The reactor temperature is set at 200°C; the space velocity is set at 5000h -1 ; The reactor pressure is at normal pressure. Simulation preparation of calcium carbide tail gas, in which the arsenic content before purification is 750mg / m 3 . After passing through the fixed bed reactor for purification, the arsenic content in the outlet gas is...

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Abstract

The invention discloses a continuous arsenic removal catalyst for industrial tail gas purification, which uses molecular sieve as a carrier, and is made by mixing active component solution, molecular sieve raw powder and bonding dispersant and extruding into strips, and the active component is copper salt. Among them, the carrier is 13X granular molecular sieve, the effective pore size is 0.8-1.5nm, and the micropore volume accounts for more than 80%; first weigh the molecular sieve raw powder, stir and add the active component solution, after the material is in a wet state, then add viscose As a dispersant, all materials are mixed evenly, and it is obtained after extruding, drying and roasting; it is used to remove arsine in atmospheres such as calcium carbide tail gas and yellow phosphorus tail gas, and oxidizes arsine through catalytic oxidation. Hydration reaction, and then derived with arsenic acid or arsenous acid. The active components of the continuous arsenic removal catalyst do not change significantly before and after the catalytic oxidation reaction, which can meet the demand of CO in the tail gas as a high value-added product.

Description

technical field [0001] The invention relates to the purification of arsine in industrial tail gas, in particular to a continuous arsenic removal catalyst used in industrial gas and a preparation method thereof. Background technique [0002] Arsine is a colorless, highly toxic gas with a density greater than air, which is contained in many smelting tail gases. For example, iron ore contains arsenic iron, calcium phosphate ore, and calcium carbide also contain arsenic. These arsenic-containing ores are heated in the presence of moisture or water vapor, and the arsenic compound exists in the form of arsine hydrogen. in industrial exhaust. In the process of producing calcium carbide in a closed furnace, for every 1t of calcium carbide produced, about 400m of by-product 3 exhaust. The content of arsine in calcium carbide tail gas is 200-800mg / m 3 , CO content is about 80%. In 2013, my country's calcium carbide production capacity was 37.9 million tons, the actual output was ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/14B01D53/86B01D53/64
Inventor 勾华杰高翊蒋化耿云峰唐伟张佳平
Owner BEIJING PEKING UNIV PIONEER TECH
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