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Catalytic yellow phosphorus tail gas oxidizing and purifying method in fixed bed

A technology for catalytic oxidation and yellow phosphorus tail gas, applied in chemical instruments and methods, phosphorus compounds, separation methods, etc., can solve the problems of inability to meet the raw material gas requirements of one-carbon chemical industry, low phosphorus removal efficiency, incomplete phosphorus removal, etc. , to achieve the effect of cheap catalyst, simple process flow and increased oxygen content

Inactive Publication Date: 2003-02-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main problems of the above method are: the removal efficiency of phosphorus is low, the removal of phosphorus is incomplete, it will cause catalyst poisoning in the occasion of using various catalysts, and it cannot meet the requirements of one-carbon chemical industry for raw material gas

Method used

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  • Catalytic yellow phosphorus tail gas oxidizing and purifying method in fixed bed
  • Catalytic yellow phosphorus tail gas oxidizing and purifying method in fixed bed
  • Catalytic yellow phosphorus tail gas oxidizing and purifying method in fixed bed

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The preparation of embodiment one (1) catalyst

[0045]Place activated alumina carrier in 0.2% lanthanum nitrate solution and immerse for 20 hours, age for 24 hours, evaporate to dryness on an electric constant temperature water bath, and finally put it into a muffle furnace for roasting at a constant temperature of 110°C 4 hours, then calcined at 500° C. for 6 hours, and dried at 110° C. for 4 hours to obtain a finished catalyst and fill it into a reactor to form a fixed bed for catalytic oxidation. (2) Exhaust gas purification conditions

[0046] The yellow phosphorus tail gas passes through the exhaust fan at a distance of 500 meters 3 (gas volume) / m 3 (Catalyst volume) The flow rate of hours goes through the alkali washing tower to remove carbon dioxide and some phosphorus, sulfur, and fluorine impurities, and then is heated to 80°C by a preheater, and oxygen is added at the same time, and passes through the fixed bed of the reactor from bottom to top. Here, phos...

Embodiment 2

[0048] The preparation of embodiment two (1) catalyst

[0049] Put the zeolite carrier in a ferrous sulfate solution with a concentration of 0.3% and immerse it for 24 hours. After aging for 24 hours, evaporate it to dryness on an electric constant temperature water bath, and finally put it into a muffle furnace for roasting. Constant temperature for 2 hours, then calcined at 550°C for 5 hours, and dried at 110°C for 4 hours to obtain a finished catalyst. (2) Exhaust gas purification conditions

[0050] The yellow phosphorus tail gas passes through the exhaust fan at a distance of 550 meters 3 (gas volume) / m 3 (Catalyst volume) The flow rate of hour is to remove carbon dioxide and some phosphorus, sulfur, and fluorine impurities through the alkali washing tower, then heat to 70°C through the preheater, supplement oxygen at the same time, and pass through the fixed bed of the reactor from bottom to top. Here, phosphorus and sulfur impurities are catalyzed and oxidized, and t...

Embodiment 3

[0052] Embodiment three (1) preparation of catalyst

[0053] The activated carbon carrier was immersed in 0.5% potassium hydroxide solution for 18 hours, and after aging for 24 hours, it was evaporated to dryness on an electric constant temperature water bath, and dried at 110°C for 6 hours to obtain a finished catalyst. (2) Exhaust gas purification conditions

[0054] The yellow phosphorus tail gas passes through the exhaust fan at a distance of 600 meters 3 (gas volume) / m 3 (Catalyst volume) The flow rate of hours goes through the alkali washing tower to remove carbon dioxide and some phosphorus, sulfur, and fluorine impurities, and then is heated to 110°C by a preheater, and oxygen is added at the same time, and passes through the fixed bed of the reactor from bottom to top. Here, phosphorus and sulfur impurities are catalyzed and oxidized, and the oxidized products such as phosphorus pentoxide, phosphorus trioxide, and sulfur are adsorbed on the surface of the catalyst. ...

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Abstract

The technological process consists of alkali cleaning, catalytic oxidation, and other steps. In the alkali cleaning step, simple substance phosphorus, phosphoric compound, fluoric compound, hydrogen sulfide, dust, etc. are eliminated initially. Heated tail gas is made to enter to catalytic fixed bed, where P, S, F and other impurities are elimianted via catalytic oxidation to reach the requirement as chemical material gas. The catalyst of the present invention can raise the yellow phosphorus tail gas purifying efficiency. The present invention has the advantages of easy-to-regenerate catalyst, high utilization, simple technological process and low purifying cost.

Description

[0001] (1) Technical Field: Yellow Phosphorus Tail Gas Purification (two) background technology: [0002] Yellow phosphorus is an important chemical product. my country is the world's main producer and exporter of phosphorus. At present, the national production capacity of yellow phosphorus is more than 700,000 tons. In 2000, the annual output of yellow phosphorus reached 505,900 tons. [0003] Since the 1980s, with the development of one-carbon chemical technology, especially the achievements in carbon monoxide oxo synthesis technology, CO oxo synthesis produces methyl formate, dimethyl ether, acetic acid, methanol, dimethyl carbonate, etc. Organic compounds of economic value become possible. If the yellow phosphorus tail gas containing nearly 90% carbon monoxide can be used to synthesize one-carbon chemical products after purification, it will not only avoid environmental pollution, but also reduce the production cost of yellow phosphorus and change the current production of ...

Claims

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Application Information

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IPC IPC(8): B01D53/34B01D53/75B01D53/82C01B25/027
CPCY02P20/584
Inventor 宁平潘克昌谢有畅王学谦陈梁陈云华吴满昌吴云
Owner KUNMING UNIV OF SCI & TECH
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