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Heterogeneous catalytic oxidation method for treating tail gas generated in sodium hypophosphite preparation process from sludge phosphorus

A technology of heterogeneous catalytic oxidation and sodium hypophosphite, applied in hypophosphorous acid, chemical instruments and methods, phosphorous acid, etc., can solve the problems of low absorption efficiency and slow reaction speed, and achieve less catalyst consumption and good stability Effect

Inactive Publication Date: 2010-08-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been found in practical applications that hydrogen peroxide is used to absorb phosphine tail gas. Due to its slow reaction speed, the absorption efficiency is low.

Method used

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  • Heterogeneous catalytic oxidation method for treating tail gas generated in sodium hypophosphite preparation process from sludge phosphorus
  • Heterogeneous catalytic oxidation method for treating tail gas generated in sodium hypophosphite preparation process from sludge phosphorus
  • Heterogeneous catalytic oxidation method for treating tail gas generated in sodium hypophosphite preparation process from sludge phosphorus

Examples

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Effect test

example 1

[0022] Dissolve cerium nitrate in distilled water to make a solution with a cerium ion concentration of 0.01mol / L; soak activated carbon with a particle size of 40 mesh in 0.1mol / L sodium hydroxide solution for 1 hour, and wash it repeatedly with distilled water after soaking Repeatedly, soak in 0.1mol / L hydrochloric acid solution for 1 hour, wash repeatedly with distilled water after soaking, and finally soak in distilled water for 1 hour, filter and dry at 105°C for 12 hours; after pretreatment, according to solid Add liquid mass ratio 1:5 into the prepared solution, stir at room temperature for 4 hours, then soak for 20 hours, and finally filter; put the dried filter cake in a roasting furnace at a roasting temperature of 250°C and keep warm for 2 hour, sieved to obtain a 40-mesh catalyst; the prepared catalyst was added to the hydrogen peroxide solution at a mass ratio of 1:100. When preparing sodium hypophosphite, the materials in the reactor are 9.97g of mud phosphorus (...

example 2

[0025] Dissolve ferric nitrate in distilled water to make a solution with an iron ion concentration of 0.5 mol / L; soak 4A zeolite with a particle size of 100 mesh in 0.1 mol / L sodium hydroxide solution for 1 hour, and use distilled water after soaking. Wash for many times, then soak in 0.1mol / L hydrochloric acid solution for 1 hour, wash repeatedly with distilled water after soaking, and finally soak in distilled water for 1 hour, filter and dry at 118°C for 12 hours; after pretreatment, according to Add the solid-liquid mass ratio 1:18 into the prepared solution, stir at room temperature for 5 hours, soak for 19 hours, and finally filter; put the dried filter cake in a roasting furnace at a roasting temperature of 500°C for 4 hours , and sieved to obtain a 100-mesh catalyst; the prepared catalyst was added to the hydrogen peroxide solution at a mass ratio of 1:100. When preparing sodium hypophosphite, the materials in the reactor are 9.98g of mud phosphorus (phosphorus conten...

example 3

[0028] Dissolve copper nitrate in distilled water to make a solution with an iron ion concentration of 1mol / L; soak rice husk ash with a particle size of 160 mesh in 0.1mol / L sodium hydroxide solution for 1 hour, and use distilled water after soaking Wash for many times, then soak in 0.1mol / L hydrochloric acid solution for 1 hour, wash repeatedly with distilled water after soaking, and finally soak in distilled water for 1 hour, filter and dry at 130°C for 12 hours; after pretreatment, according to Add solid-liquid mass ratio 1:30 into the prepared solution, stir at room temperature for 6 hours, impregnate for 18 hours, and finally filter; put the dried filter cake in a roasting furnace at a roasting temperature of 800°C and keep it warm for 6 hours , and sieved to obtain a 160-mesh catalyst; the prepared catalyst was added to the hydrogen peroxide solution at a mass ratio of 1:100. When preparing sodium hypophosphite, the materials in the reactor are 10.02g of mud phosphorus ...

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Abstract

The invention relates to a method for treating waste slag in a yellow phosphorus production process, in particular to a heterogeneous catalytic oxidation method for treating high-concentration phosphine tail gas generated in a sodium hypophosphite preparation process from sludge phosphorus and belongs to the technical field of industrial waste gas purification treatment. The method comprises the following steps: heating the sludge phosphorus and lye in proportion to a temperature of between 75 and 95 DEG C under the condition of oxygen isolation, performing a reaction with stirring, collecting and washing the generated phosphine, absorbing the phosphine by using solution of hydrogen peroxide in the presence of a filter cake of a nitrate catalyst, wherein the mass ratio of the catalyst to the absorption liquid is 1-20 to 1,000, and reacting to form sodium hypophosphite and sodium phosphite products. The method can reduce the air pollution caused by the phosphine tail gas, have high absorption efficiency of the phosphine, and can increase the output of the sodium hypophosphite products.

Description

technical field [0001] The invention relates to a heterogeneous catalytic oxidation method for preparing high-concentration phosphine tail gas in sodium hypophosphite tail gas from mud phosphorus, and belongs to the technical field of industrial waste gas purification treatment. Background technique [0002] The phosphorus chemical industry occupies a large proportion in the economy of Yunnan Province. The waste residue and sludge produced by yellow phosphorus production is a harmful mixture containing phosphorus, which is mainly composed of elemental phosphorus, dust impurities and water. In order to recover phosphorus in mud phosphorus, studies have shown that it is an effective treatment method to prepare sodium hypophosphite by reacting mud phosphorus with lye, the reaction temperature is not high, energy consumption is not large, and sodium hypophosphite is used as a reducing agent , Widely used in chemical plating, electroplating, machinery, food processing and other i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/165C01B25/163B01D53/46
CPCY02A50/20
Inventor 黄小凤刘伟文宁平谭娟王小妮李文卿高琨阳魏燕富
Owner KUNMING UNIV OF SCI & TECH
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