Catalytic oxidation purification method for hydrogen cyanide in industrial waste gas
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A technology for catalytic oxidation and industrial waste gas, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of poor hydrogen cyanide removal effect, and achieve high stability, easy preparation, and high activity.
Inactive Publication Date: 2008-09-24
KUNMING UNIV OF SCI & TECH
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This method is not effective for the removal of low concentration hydrogen cyanide
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Embodiment 1
[0021] Embodiment 1: The tail gas treated is calcium carbide furnace gas, and its main component volume percentage is CO 80~85%, H 2 6-8%, CO 2 1~3%, O 2 1.5~3.5%, N 2 6~8%, HCN1500~3000mg / Nm 3 , H 2 S300~900mg / Nm 3 . Get 2.1kg of copper sulfate (equivalent to 840g of copper) and dissolve it in 5L of water, and dissolve 0.2kg of palladium sulfate in 5L of 10% hydrochloric acid, then mix the two evenly, filter, and discard the filter residue to obtain 10L of mixed catalyst solution for subsequent use.
[0022] After washing with water and alkali, the main component is CO, and the content of hydrogen cyanide is 1500-3000mg / Nm 3 Calcium carbide furnace gas at 10m 3 The / h flow rate is passed into the tower from the lower part of the spray absorption tower, and the prepared mixed catalyst solution is sprayed from the upper part of the spray absorption tower at 2L / h, and the gas and liquid are in reverse contact, and react at the tower temperature of 40 °C. The mixed cataly...
Embodiment 2
[0023] Embodiment 2: the tail gas of treatment is yellow phosphorus tail gas, and its main component volume percentage is CO 85~95%, H 2 1~8%, CO 2 1~4%, O 2 0~1%, N 2 2~5%, HCN100~300mg / Nm 3 , H 2 S800~3000mg / Nm 3 ,PH 3 500~1300mg / Nm 3 . Dissolve 2.1kg of copper chloride in 5L of water, and dissolve 0.2kg of palladium oxide in 5L of 10% sulfuric acid, mix the two evenly, filter, and discard the filter residue to obtain 10L of mixed catalyst solution for later use.
[0024] After washing with water and alkali, the main component is CO, and the content of hydrogen cyanide is 100-300mg / Nm 3 The yellow phosphorus tail gas is 30m 3 The / h flow rate is passed into the tower from the lower part of the spray absorption tower, and the prepared mixed catalyst solution is sprayed into the spray absorption tower at 2L / h from the upper part of the spray absorption tower. The mixed catalyst solution that has absorbed hydrogen cyanide is sent to the stirred bubble reactor for oxid...
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Abstract
The invention relates to a method of the catalytic oxidation and purification of tail gas containing hydrocyanic acid, in particular to a method for purifying the tail gas containing hydrocyanic acid by using a chemical method. The tail gas containing hydrocyanic acid is enabled to react with a prepared mixed catalyst solution containing palladium and copper under the temperature of 4 to 100 DEG C in a absorption tower, and the tail gas containing hydrocyanic acid is blown into the absorption tower in a gas-liquid negative-direction contact way, part of the hydrocyanic acid contacts and reacts with the palladium ions to form insoluble palladium simple substance, and part of the hydrocyanic acid reacts with the copper ions to form insoluble phosphor copper, part of the hydrocyanic acid is oxidized into phosphoric acid; all the generated substances enter into the liquid phase, and the mixed catalyst solution which absorbs the hydrocyanic acid and the purified and qualified tail gas not containing the hydrocyanic acid are acquired, the mixed hydrocyanic acid catalyst solution is oxidized into a by-product of the phosphoric acid to be used as resources again, the problems of hydrocyanic acid pollution is effectively eliminated, and the method provided by the invention provides a practical purifying method for the calcium carbide furnace gas and yellow phosphorus exhaust gas used as monocarbide chemical raw materials.
Description
[0001] 1. Technical field: The present invention relates to a method for catalytic oxidation purification of tail gas containing hydrogen cyanide, in particular to a method for chemically purifying tail gas containing hydrogen cyanide. 2. Background technology: [0002] Hydrogen cyanide (HCN) inhibits respiratory enzymes, causing intracellular suffocation, acute poisoning, short-term inhalation of high-concentration hydrogen cyanide gas, immediate respiratory arrest and death. It can be produced in the production process of calcium carbide, fiber and yellow phosphorus. For example, in the production of calcium carbide, the closed calcium carbide furnace produces 400Nm of furnace gas per ton of calcium carbide 3 , a closed calcium carbide furnace with a capacity of 25500KVA produces a furnace gas volume of about 2500Nm 3 / h. Calcium carbide furnace gas, the volume percentage of its main components is CO 80% ~ 85%, H 2 6%~8%, CO 2 1% ~ 3%, O 2 1.5%~3.5%, N 2 6%~8%, HCN1500...
Claims
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