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Device and method for recovering cyanogen through electric migration and recovering NH3 through oxidation

An electric power and electric technology, applied in chemical instruments and methods, hydrogen cyanide preparation/purification/separation, separation methods, etc., can solve the problems of large chemical consumption, secondary pollution, and inability to recycle

Active Publication Date: 2013-01-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 201586472 U discloses a cyanide-containing waste gas treatment device. The cyanide-containing waste gas is fully absorbed after being mixed with caustic soda solution twice. Compared with the operation in the prior art, the absorption rate is greatly increased and the caustic soda consumption is reduced. , which improves the level of safe production, but this method also faces the consumption of a large amount of chemical agents, and produces secondary pollution, which cannot be recycled.

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  • Device and method for recovering cyanogen through electric migration and recovering NH3 through oxidation
  • Device and method for recovering cyanogen through electric migration and recovering NH3 through oxidation

Examples

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Effect test

Embodiment 1

[0025] use as figure 1 An electrokinetic migration recovery of cyanogen / oxidation recovery of NH is shown 3 The device recovers HCN in carbon fiber cyanide exhaust gas. The concentration of HCN in the exhaust gas is 30mg / m 3 , the flow rate is 100m 3 / h, the residence time is 10min, after passing through the device of electrodynamic migration recovery and purification of cyanide-containing waste gas, HCN gas with a purity of 98%-99.5% can be obtained in the HCN recovery storage tank, which is absorbed by the clear water in the HCN recovery storage tank to generate hydrogen Cyanic acid, hydrocyanic acid is oxidized to pure NH under the action of a metal oxide catalyst in a coconut shell charcoal fluidized bed 3 , the absorption tank has a concentration of 75% to 78% H 2 SO 4 , and finally the purity of 98.5% or more (NH 3 ) 2 SO 4 . The content of HCN in the discharged gas after being treated by the cathode electro-Fenton device is lower than 0.05mg / Nm 3 , far lower t...

Embodiment 2

[0027] In Example 2, two sets of electric exhaust gas treatment devices are used in series to recover HCN in the calcium carbide furnace gas. The operation steps and HCN recovery principle are the same as those in Example 1. The concentration of HCN in the exhaust gas is 2.45g / m 3 , the flow rate is 1000m 3 / h, the furnace gas enters the two-stage electric exhaust gas treatment device in two ways, the residence time is 20min, and the cyanide is recovered through electrodynamic migration / oxidation and NH is recovered 3 After the installation, HCN gas with a purity of 97%-98.5% can be obtained in the HCN recovery storage tank, which is absorbed by the clear water in the HCN recovery storage tank to generate hydrocyanic acid, and the non-metallic oxidation of hydrocyanic acid in the straw charcoal fluidized bed oxidized to pure NH under the action of a compound catalyst 3 , there is H in the absorption tank with a concentration of 90% to 93%. 2 SO 4 , and finally the puri...

Embodiment 3

[0029] In Example 3, two sets of electric exhaust gas treatment devices are used in series to recover HCN in the calcium carbide furnace gas. The operation steps and HCN recovery principle are the same as those in Example 1. The concentration of HCN in the exhaust gas is 2.45g / m 3 , enter the two-stage electric waste gas treatment device in two ways, after the device for recycling and purifying cyanide-containing waste gas through electrodynamic migration, HCN pure gas is in reverse contact with HCl absorption liquid, and hydrogen cyanide is recovered through electrodynamic migration to prepare NH 4 After the installation of Cl, NH with a purity of 97%-98.5% can be obtained in the product tank 4 Cl product.

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Abstract

The invention discloses a device and method for recovering cyanogen through electric migration and recovering NH3 through oxidation. The device disclosed by the invention is composed of an electric waste gas treatment device, a cathode electric Fenton device and a carbon fluidized bed, wherein the electric waste gas treatment device is composed of an anode chamber and a cathode chamber which are separated by an ion-selective permeable membrane; and when voltages are applied to both ends of the device, waste gas enters the cathode chamber, is converted into the form of CN- and enters the anode chamber through an ion exchange membrane under the effect of electric migration, so that high-concentration HCN gas is obtained in the anode chamber and is absorbed by clear water in an HCN recovery storage tank to generate hydrocyanic acid, the hydrocyanic acid is oxidated into NH3 under the effect of a catalyst in the carbon fluidized bed, and NH3 is absorbed by acid in an absorption tank for reutilization. According to the device disclosed by the invention, HCN can be recovered from various kinds of cyanogen-containg waste gas (such as carbon fiber tail gas, allyl cyanide waste gas, calcium carbide furnace gas, coke oven gas, yellow phosphorus tail gas and the like) and can be synthesized into NH3 products.

Description

Technical field [0001] The invention involves an electric migration recycling recycling of cyanocyan / oxidation recycling NH 3 The device and its method. Background technique [0002] HCN's removal method is mainly absorption, adsorption and combustion.Several methods of removing HCN exhaust gas have their own characteristics. The advantages and disadvantages of each processing method and their suitable objects are different.When dealing with HCN tail gas generated in actual production, factors such as HCN concentration, other components and emissions methods, existing equipment and processing methods include the HCN removal method.When adsorbing the adsorption method, some gas groups will affect the adsorption of activated carbon on HCN.For example, when the exhaust gas contains more water vapor, there is a competitive adsorption phenomenon in the water vapor and HCN, which greatly reduces the treatment effect of the adsorbed HCN.When the volume of the water vapor exceeds 50 %, t...

Claims

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Application Information

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IPC IPC(8): B01D53/32B01D53/14B01D53/18B01D53/46C01C3/04C01C1/02
Inventor 吴祖成廖文
Owner ZHEJIANG UNIV
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