Method for hydrolysis-oxidation coupled purification of HCN

An oxidative coupling and catalyst technology, applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of limited HCN purification effect, expensive precious metals, and by-product pollution. , to achieve good purification effect, high selectivity and low cost.

Inactive Publication Date: 2013-12-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN 102921285 A discloses a circulating liquid sprayed with oxidant hydrogen peroxide, catalyst and acidity regulator to absorb HCN, and convert HCN into N2, CO2, this method has the problem of disposal of invalid circulating fluid, patent CN 101108337 A discloses a catalyst for the decomposition of HCN, which is composed of aluminum oxide, silicon oxide, Titanic acid, squash powder, inorganic salts, nitric acid, etc. are prepared as catalysts to convert HCN into NH3, and other COS, CO2, etc. In this method, HCN is decomposed, but the generated by-products still have a certain degree of pollution; patents CN 1404905 A, CN1404900 A, and CN 1404904 A use catalysts such as platinum, rhodium, and palladium to oxidize and purify HCN. In this method, the reaction temperature is 250-550 °C , the temperature is relatively high, and the price of precious metals is expensive; patent CN 142652 A discloses a catalyst preparation method for supporting Cu, using the catalyst to catalyze the combustion of...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for hydrolysis-oxidation coupling purification HCN described in this embodiment comprises the following steps:

[0037] (1) Preparation of catalyst

[0038] (A) Take 13.9 g FeSO 4 ·7H 2 O dissolved in 500ml distilled water, where Fe 2+ The concentration is 0.1 mol / L;

[0039] (B) Dissolve 3 g of glycine in 100 ml of distilled water to obtain a 0.4 mol / L glycine solution, and dissolve 5.5 g of salicylic acid in 100 ml of ethanol to obtain a 0.4 mol / L salicylic acid solution. Mix and stir evenly to obtain a ligand solution, 5.95 g CoCl 2 ·6H 2 O was dissolved in 100ml of distilled water, then slowly added to the previously prepared ligand solution, and the volume was adjusted to 500 ml with distilled water to obtain Co(II) Schiff base complex, in which the concentration of Co element was 0.05 mol / L;

[0040] (C) Take 3.64 g La 2 (SO 4 ) 3 9H 2 O was dissolved in 500ml of distilled water, stirring constantly to make it completely dissolved, La +3 The ...

Embodiment 2

[0048] The method for hydrolysis-oxidation coupling purification HCN described in this embodiment comprises the following steps:

[0049] (1) Preparation of catalyst

[0050] (A) Take 40.4 g Fe(NO 3 ) 2 ·7H 2 O dissolved in 500ml distilled water, where Fe 2+ The concentration is 0.2 mol / L;

[0051] (B) Dissolve 3.8g of glycine in 100 ml of distilled water to obtain a 0.45 mol / L glycine solution, and dissolve 6.2 g of salicylic acid in 100 ml of ethanol to obtain a 0.45 mol / L salicylic acid solution. The solutions were mixed and stirred evenly to obtain a ligand solution, and 11.9 gCoCl 2 ·6H 2 O was dissolved in 100ml of distilled water, then slowly added to the previously prepared ligand solution, and the volume was adjusted to 500 ml with distilled water to obtain a Co(II) Schiff base complex, in which the concentration of Co was 0.1 mol / L;

[0052] (C) Take 4.33 g La (NO 3 ) 3 ·6H 2 O was dissolved in 500ml of distilled water, stirring constantly to make it comple...

Embodiment 3

[0060] The method for hydrolysis-oxidation coupling purification HCN described in this embodiment comprises the following steps:

[0061] (1) Preparation of catalyst

[0062] (A) Take 8.45 g MnSO 4 ·H 2 Dissolve O in 500 ml of distilled water and stir continuously to dissolve it completely, in which Mn 2+ The concentration is 0.1mol / L;

[0063] (B) Dissolve 8 g of cobalt sulfamate in 500 ml of distilled water and stir evenly to obtain cobalt sulfamate, in which the concentration of Co is 0.05 mol / L;

[0064] (C) Take 3.7 g LaCl 3 ·6H 2 O, dissolved in 500ml distilled water, where La +3 The concentration is 0.02mol / L;

[0065] (D) Mix the solutions obtained in steps (A), (B) and (C) according to a volume ratio of 1:1:1 to obtain a mixed solution;

[0066] (E) Preparation of the modulation carrier, which specifically includes the following steps:

[0067]Dissolve n-butyl titanate in an equal volume of absolute ethanol to obtain an ethanol solution of n-butyl titanate to...

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Abstract

The invention discloses a method for hydrolysis-oxidation coupled purification of HCN, belonging to the field of gaseous pollutant control. According to the method, a catalyst takes Fe, Mn, Mo and W as active ingredients for hydrolysis and oxidation, and a Co(II)Schiff base complex, cobalt phthalocyanine sulfonate and the like, which serve as oxygen storing active ingredients, and rare-earth-metal active substances, such as La, Ce and the like, are added to improve the hydrothermal stability of the catalyst, so that HCN can be subjected to hydrolysis-oxidation coupled catalytic purification under low-temperature and micro-oxygen conditions and is finally converted into non-toxic and harmless products, namely N2, CO2 and water, and the selectivity of N2 is high. A preparation method of the catalyst is simple in process and low in cost.

Description

technical field [0001] The invention relates to a hydrolysis-oxidation coupling purification method for HCN, which realizes the harmless conversion of HCN and belongs to the field of air pollutant control. Background technique [0002] HCN is a toxic and highly corrosive gas that inhibits the function of respiratory enzymes in humans and other warm-blooded animals so that tissues cannot normally obtain oxygen from the blood and suffocate. Coal, biomass and other substances are pyrolyzed or burned at high temperatures During the process, the contained nitrogen element will be partially converted into HCN, such as high-temperature coal pyrolysis gas, blast furnace gas, converter gas and coke oven gas, biomass pyrolysis gas, ore-heating electric furnace tail gas And the coal chemical industry contains a large amount of HCN. Due to the strong toxicity of HCN, HCN waste gas purification must meet strict environmental emission and hygiene standards to prevent HCN from causing air ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/54B01J23/83B01J29/78B01J23/889B01J23/888
Inventor 王学谦马懿星宁平贾锐王飞王郎郎胡景丽
Owner KUNMING UNIV OF SCI & TECH
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