Method for purifying arsenic hydride gas in industrial waste gas

A technology for industrial waste gas and arsine, which is applied in the direction of chemical instruments and methods, separation methods, physical/chemical process catalysts, etc., can solve the problems of unexplained regeneration of arsenic removal, single mixed gas atmosphere, and low regeneration performance. Achieve good selectivity, good catalytic performance, high activity at low temperature

Inactive Publication Date: 2009-04-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are following problems in existing method: (1) only be limited to PH in the air 3 and AsH 3 or pH in hydrogen stream 3 and AsH 3 Removal of AsH under a reducing atmosphere not involving CO-containing industrial tail gas 3 (2) Both are limited to the removal of these two toxic and harmful gases at the same time, and the mixed gas atmosphere is relatively single; (3) The regeneration of the arsenic removal agent is not specified. If the arsenic removal agent cannot be regenerated or the regeneration performance is low , it is easy to cause secondary pollution and increase costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Stir and mix the cobalt phthalocyanine solution with a mass percentage of 0.01% at room temperature, and add MnSO with a concentration of 0.2mol / L while stirring 4 solution, its cobalt phthalocyanine solution with MnSO 4 The volume ratio of the solution is 20:1, and then continue to stir at room temperature for 0.5h to obtain cobalt phthalocyanine, Mn 2+ A mixed modified solution of ions. After aging the obtained modified solution at room temperature for 24 hours, put X-type molecular sieves into the modified solution, and then stir it in constant temperature water at 20°C for 1 hour. After stirring, impregnate it at room temperature 48h, impregnated, filtered, dried at a drying temperature of 90°C for 24h, and finally placed in a roasting furnace, and roasted at a temperature of 250°C for 12h under anaerobic conditions to obtain the modified molecular sieve catalyst used for purification. The specific surface area of ​​the modified molecular sieve catalyst ...

Embodiment 2

[0016] Example 2: Stir and mix the cobalt phthalocyanine solution with a mass percentage of 0.1% at room temperature, and add FeCl with a concentration of 1 mol / L while stirring 3 solution, its cobalt phthalocyanine solution with FeCl 3 The volume ratio of the solution is 30:1, and then continue stirring at room temperature for 0.5h to obtain cobalt phthalocyanine, Fe 3+ A mixed modified solution of ions. After aging the obtained modified solution at room temperature for 24 hours, put Y-type molecular sieves into the modified solution, then stir it in constant temperature water at 40°C for 1 hour, and then impregnate it at room temperature 48h, impregnated, filtered, dried at a drying temperature of 100°C for 24h, and finally placed in a roasting furnace, and roasted at a temperature of 300°C for 12h under anaerobic conditions to obtain the modified molecular sieve catalyst used for purification. The specific surface area of ​​the modified molecular sieve catalyst can reach 5...

Embodiment 3

[0019] Example 3: Stir and mix the cobalt phthalocyanine solution with a mass percentage of 0.1% at room temperature, and add 2mol / L of FeCl while stirring 3 solution, 1mol / L MnSO 4 solution and 0.5mol / L NiCl 2 solution, its cobalt phthalocyanine solution with FeCl 3 , MnSO 4 solution, NiCl 2 The volume ratios of the solutions were 50:1, 40:1, 200:1, and then continued to stir at room temperature for 0.5h to obtain cobalt phthalocyanine, Fe 3+ , Mn 2+ 、Ni 2+ A mixed modified solution of ions. After aging the obtained modified solution at room temperature for 24 hours, put X-type molecular sieves into the modified solution, and then stir it in constant temperature water at 30°C for 1 hour. After stirring, impregnate it at room temperature 48h, impregnated, filtered, dried at a drying temperature of 120°C for 24h, and finally placed in a roasting furnace, and roasted at a temperature of 350°C for 12h under anaerobic conditions to obtain the modified molecular sieve catalys...

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PUM

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Abstract

The invention relates to a method for purifying hydrogen arsenide in industrial waste gas, which comprises the following steps: firstly, a mixed modified solution of a cobalt phthalocyanine solution and one ion or a plurality of ions of Fe<3+>, Mn<2+> and Ni<2+> is prepared; secondly, molecular sieve is placed into the modified solution, and modified molecular sieve catalyst is obtained after impregnation, drying and calcination; and thirdly, the modified molecular sieve catalyst is placed into a fixed bed reactor, and the industrial waste gas, including 80 to 90 volume percent of CO, less than 2 volume percent of O2 and 500 to 1600 milligrams per cubic meter of AsH3, undergoes solid catalysis, oxidation and purification, so that the content of the hydrogen arsenide in the industrial waste gas is reduced to below 0.3 milligram per cubic meter. The modified molecular sieve catalyst has high low-temperature activity, can be used in complex industrial gas atmosphere containing CO, H2S, SO2, COS, PH3 and so on, and has good selectivity on AsH3. The method can be applied in factories such as large-scale coke-oven plants, yellow phosphorus manufacturing plants, calcium carbide plants, and provides a feasible path for air pollution control and monocarbide chemical process development of China.

Description

1. Technical field [0001] The invention relates to a method for purifying arsine gas in industrial waste gas, and belongs to the technical field of waste gas treatment chemical industry. 2. Background technology [0002] Arsine is a colorless gas and is a highly toxic substance. Its toxicity is 7 times greater than that of Lewis gas and 400 times greater than that of cacoky sodium arsenate. In industrial production, during the smelting and storage of arsenic-containing ferrosilicon, arsenic hydrogen will be produced when it is exposed to humid air or slag of hot arsenic-containing minerals is doused with water; calcium carbide manufacturing, production and use of acetylene, acid pouring of metal products, battery charging , Production of synthetic dyes and other occasions, will produce arsine. Especially in the production of calcium carbide, the calcium carbide furnace gas produced per 1 ton of calcium carbide is about 400m 3 , its composition is: CO: 80% ~ 90%; CO 2 : 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/46B01J29/00
Inventor 王学谦宁平蒋明师雁
Owner KUNMING UNIV OF SCI & TECH
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