Absorption liquid used for purifying hydrogen phosphide by wet-catalytic oxidation

A technology of wet catalytic oxidation and liquid absorption, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems of secondary pollution of phosphorus-containing activated carbon, high reaction temperature, etc., and achieve easy separation and recovery, simple components, easily accessible effects

Inactive Publication Date: 2009-11-11
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Although the purification efficiency of phosphine in this method is very high, the reaction temperature is very high
Chinese patent CN1076173A discloses a method for purifying PH in a hydrogen stream 3 The impregnated activated carbon is based on coal-based granular activated carbon as a carrier, impregnated with four components of Cu, Hg, Cr, and Ag, when the concentration of phosphine is 1000ppm, the inner diameter of the reactor tube

Method used

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  • Absorption liquid used for purifying hydrogen phosphide by wet-catalytic oxidation

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Experimental program
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Effect test

Embodiment 1

[0012] Absorption liquid: Weigh 0.3375g CuCl 2 Dissolve in 100mL distilled water, stir well to dissolve, and make 0.025mol / L CuCl 2 Solution, add 0.1mol / L HCl solution, adjust the pH to 4, and obtain the absorption solution.

[0013] Reaction conditions: Take 50mL of the prepared absorption solution and pour it into the bubbling reactor, the pH of the gas composition at the inlet of the reactor 3 1000mg / m 3 , O 2 1% (volume ratio), N 2 As carrier gas, the total gas flow rate is 200mL / min, and the reaction temperature is 50°C.

[0014] Purification effect: Under this condition, the purification efficiency of phosphine in the initial reaction is low, only 32%. As the reaction progresses, the purification efficiency increases, and the purification efficiency reaches 90% in 2 hours, and continues to rise, and the purification efficiency reaches a maximum of 97.53%. Then it gradually decreased, and the purification efficiency was still above 70% at 190 minutes.

Embodiment 2

[0016] Absorption solution: Weigh 0.8g CuSO 4 Dissolve in 100mL distilled water, stir well to dissolve, and make 0.05mol / L CuSO 4 The solution is the obtained absorption liquid.

[0017] Reaction conditions: Take 50mL of the prepared absorption solution and pour it into the bubbling reactor, the pH of the gas composition at the inlet of the reactor 3 900mg / m 3 , O 2 1% (volume ratio), N 2 As carrier gas, the total gas flow rate is 300mL / min, and the reaction temperature is 50°C.

[0018] Purification effect: Under this condition, the initial purification efficiency of phosphine reaches 93.92%. As the reaction progresses, the purification efficiency increases. The concentration of phosphine at the outlet is 0 at 40 minutes, and the 100% purification efficiency drops rapidly after 2 hours. The purification efficiency is above 30%.

Embodiment 3

[0020] Absorbing solution: Weigh 0.376g Cu(NO 3 ) 2 Dissolve in 100mL distilled water, fully stir to dissolve, and make 0.02mol / L Cu(NO 3 ) 2 solution, add 0.1mol / L HNO 3 solution, adjust the pH to 5, and obtain an absorption solution.

[0021] Reaction conditions: Take 50mL of the prepared absorption solution and pour it into the bubbling reactor, the pH of the gas composition at the inlet of the reactor 3 800mg / m 3 , O 2 3% (volume ratio), N 2 As carrier gas, the total gas flow rate is 100 mL / min, and the reaction temperature is 50 °C.

[0022] Purification effect: Under this condition, the initial purification efficiency of phosphine is 46.03%. As the reaction proceeds, the purification efficiency increases rapidly. After 40 minutes, the purification efficiency rises to 94.96%, and the purification efficiency continues to rise, reaching 100% in 80 minutes. The purification efficiency began to decrease after 7 hours, and the purification efficiency dropped to 42.67%...

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Abstract

The invention relates to an absorption liquid used for purifying gas, in particular to an absorption liquid used for purifying hydrogen phosphide by wet-catalytic oxidation, belonging to the technical field of applying the catalytic technology in purification of atmosphere pollution. The absorption liquid adopts salt solution containing Cu; and the pH value of the absorption liquid is 3 to 5. The absorption liquid has the advantages of simple components, low price and low using cost, and simultaneously has higher purification efficiency.

Description

1. Technical field [0001] The invention relates to the preparation of an absorbing liquid, in particular to an absorbing liquid used for wet catalytic oxidation to purify phosphine, and belongs to the technical field of catalytic technology applied to air pollution purification. 2. Technical background [0002] Phosphine is a colorless, highly toxic gas, which is generally produced in industrial production processes such as phosphorus coal chemical production, acetylene production, and sodium hypochlorite production. If the tail gas containing phosphine is discharged directly, it will seriously pollute the atmospheric environment and endanger human health. Moreover, the existence of phosphine hinders the resource utilization of exhaust gas. Industrial exhaust gas containing phosphine, such as phosphorus coal chemical exhaust gas, acetylene production exhaust gas, and calcium carbide furnace gas, is rich in CO. In order to protect the environment and realize waste resource ut...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/46
Inventor 易红宏杨丽娜唐晓龙宁平于丽丽余琼粉李华
Owner KUNMING UNIV OF SCI & TECH
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