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Purification method of low concentration phosphine waste gas

A phosphine, low-concentration technology, applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high catalyst cost, difficult separation and recovery of products and catalysts, etc. Achieve the effects of easy separation and recovery, small and uniform bubbles, and strong operability

Inactive Publication Date: 2009-01-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the catalyst in this method is high, and the product and the catalyst are not easy to separate and recycle

Method used

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  • Purification method of low concentration phosphine waste gas
  • Purification method of low concentration phosphine waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of catalyst: Weigh aluminum nitrate and copper nitrate according to the molar ratio of the elements at 1:1, dissolve aluminum nitrate with distilled water, add ammonia water with a volume fraction of 5% to prepare aluminum hydroxide sol; dissolve copper nitrate with distilled water, add In the aluminum sol, then add ammonia water with a volume fraction of 5% until no precipitation occurs, leave it to age for 6 hours after high-speed stirring, wash the resulting precipitation with distilled water, filter it three times and then dry it. The dried solid is ground at 400 °C for 3 hours.

[0029] Preparation of absorption solution: Take 10 ml of 1mol / L copper sulfate solution, add 4 to 5 drops of ammonia water with a volume fraction of 5% in the copper sulfate solution, so that the copper sulfate is just completely transformed into copper hydroxide precipitation, and the copper hydroxide precipitation is used Washing and filtering with distilled water for 3 to 4 ...

Embodiment 2

[0033] Catalyst preparation: Weigh iron nitrate and copper nitrate according to the element molar ratio of 1:2, dissolve them in distilled water to prepare iron nitrate solution and copper nitrate solution, mix the two solutions, and add 10% carbonic acid in the mixed solution Sodium solution until the precipitation is complete, wash the precipitate with distilled water and filter, repeat the operation 3 to 4 times, then dry the precipitate and grind it, and roast the obtained particles at 400°C for 4 hours to obtain the catalyst.

[0034] Preparation of absorption solution: Take 10 ml of 1mol / L copper sulfate solution, add ammonia water with a volume fraction of 10% to the copper sulfate solution, so that the copper sulfate is just completely transformed into copper hydroxide precipitate, wash the copper hydroxide precipitate with distilled water, pump Filter for 3 to 4 times; dry the copper hydroxide precipitate after washing and filtering, then use 10% ammonia water by volum...

Embodiment 3

[0038]Catalyst preparation: take aluminum nitrate, copper nitrate and cerium nitrate by weighing aluminum nitrate, copper nitrate and cerium nitrate according to the element molar ratio of 100:100:1, dissolve aluminum nitrate with distilled water to prepare copper nitrate solution, add ammonia water with a volume fraction of 10% to prepare aluminum hydroxide sol; Copper nitrate and cerium nitrate were dissolved in distilled water, respectively, and added to the aluminum hydroxide sol in turn, and ammonia water with a volume fraction of 10% was added until no precipitation was produced. After high-speed stirring, it was left to age for 6 hours, and the obtained precipitation was washed with distilled water and pumped. After filtering three times, it was dried, and the dried solid was finely ground and calcined at 350°C for 4h.

[0039] Preparation of absorption solution: Take 10 ml of 1mol / L copper sulfate solution, add ammonia water with a volume fraction of 5% to the copper su...

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Abstract

The invention provides a method for purifying the exhaust gas with low concentration of phosphine. The method is characterized in that an absorption liquid and a solid catalyst are put into a bubbling reactor according to the ratio of 100 ml:1-3 g; the gas containing low-concentration phosphine is allowed to enter the reactor; the reaction temperature is controlled to be 40 DEG C to 80 DEG C; phosphine is purified in the bubbling reactor; and the tail gas after purification has the concentration of phosphine as low as 50 mg / m<3>. The method has the advantages as follows: (1) the method is simple, the operability is strong, the purification efficiency is improved, and the purification cost is reduced; (2) the catalyst is easy to separate, reclaim and reuse; (3) the bubbles in the bubbling reactor are tiny and uniform, thereby strengthening the dissolution of phosphine in the absorption liquid; (4) the reaction conditions are mild and easy to implement; and (5) phosphoric acid can be reclaimed for re-implement of changing waste into resource.

Description

technical field [0001] The invention relates to the technical field of air pollution purification, in particular to a method for purifying low-concentration phosphine waste gas. Background technique [0002] Phosphine is contained in many chemical tail gases rich in carbon monoxide, such as tail gas produced by yellow phosphorus, tail gas produced by acetylene, and calcium carbide furnace gas. In order to use the carbon monoxide in the tail gas to produce high value-added products, it is necessary to remove phosphine. Phosphine is a colorless and highly toxic gas, which can easily cause various C 1 Chemical catalyst poisoning can corrode and damage boiler materials, seriously affecting the resource utilization of these exhaust gases. Phosphine is a gas that is difficult to purify. At present, there are two types of methods for purifying phosphine in industry: dry method and wet method, such as combustion method, adsorption method and catalytic oxidation. [0003] Combusti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/78B01D53/46B01J23/72B01J23/745B01J37/03
Inventor 易红宏杨丽娜唐晓龙余琼粉于丽丽李华
Owner KUNMING UNIV OF SCI & TECH
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