Method and device for purifying hydrogen cyanide industrial waste gas by electrodialysis

An industrial waste gas and electrodialysis technology, applied in the field of environmental engineering, can solve the problems of high energy consumption, poor hydrogen oxide removal effect, and reduce hydrogen cyanide content, etc., to achieve high gas purification rate, increase capacity, and increase purification volume effect

Active Publication Date: 2013-05-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Publication No. CN 85108796 A discloses a process for removing hydrogen cyanide from a gas stream. The method is to remove HCN from a gas stream in two steps. First, the gas stream is contacted with a special oxidation reactant to remove large Partial HCN, then, the gas stream is contacted with polysulfide solution to reduce the hydrogen cyanide content in the gas stream, this method is not effective for the removal of low concentration of hydrogen oxide
[0008] The patent with application number 200810058504.3 discloses a method for purifying and recovering hydrogen cyanide in industrial waste gas by using a special hydrolysis catalyst. T

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  • Method and device for purifying hydrogen cyanide industrial waste gas by electrodialysis
  • Method and device for purifying hydrogen cyanide industrial waste gas by electrodialysis

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Embodiment 1

[0034] Embodiment 1: the method and the device of electrodialysis purification hydrogen cyanide industrial waste gas, specific content is as follows:

[0035] 1. The preparation of cobalt-containing perfluorosulfonic acid ion exchange membrane, the specific steps are as follows:

[0036] (1) With perfluoroperoxide (2-(2-fluorosulfonylethoxy)-propyl vinyl ether) as the initiator, fluorine-containing compounds (tetrafluoroethylene and hexafluoropropylene in a molar ratio of 1:1 prepared by mixing in the ratio of ) as a mixed solvent, mix and stir the two substances evenly, separate the precipitate, wash the precipitate three times, dry at 90°C, and melt and extrude at 160°C to obtain -SO 2 Perfluorosulfonic acid precursor resin of F group, wherein the molar ratio of initiator to fluorine-containing compound is 1:1;

[0037] (2) According to the ratio of adding 20ml of cobalt-containing NaOH aqueous solution per gram of perfluorosulfonic acid precursor resin, add perfluorosulfon...

Embodiment 2

[0044] Embodiment 2: the method and the device of electrodialysis purification hydrogen cyanide industrial waste gas, specific content is as follows:

[0045] 1. The preparation of cobalt-containing perfluorosulfonic acid ion exchange membrane, the specific steps are as follows:

[0046] (1) With perfluoroperoxide (2-(2-fluorosulfonylethoxy)-propyl vinyl ether) as the initiator, fluorine-containing compounds (tetrafluoroethylene and hexafluoropropylene in a molar ratio of 1:1 prepared by mixing the ratio) as a mixed solvent, mix and stir the two substances evenly, separate the precipitate, wash the precipitate 4 times, dry at 100°C, and melt extrude at 200°C to obtain -SO 2 The perfluorosulfonic acid precursor resin of the F group, wherein the molar ratio of the initiator to the fluorine-containing compound is 0.5:1;

[0047] (2) According to the ratio of adding 50ml of cobalt-containing NaOH aqueous solution per gram of perfluorosulfonic acid precursor resin, add perfluorosu...

Embodiment 3

[0053] Embodiment 3: the method and the device of electrodialysis purification hydrogen cyanide industrial waste gas, specific content is as follows:

[0054] 1. The preparation of cobalt-containing perfluorosulfonic acid ion exchange membrane, the specific steps are as follows:

[0055] (1) With perfluoroperoxide (2-(2-fluorosulfonylethoxy)-propyl vinyl ether) as the initiator, fluorine-containing compounds (tetrafluoroethylene and hexafluoropropylene in a molar ratio of 1:1 Mixed in the proportion prepared) as a mixed solvent, the two substances were mixed and stirred evenly, separated and precipitated, and the precipitate was washed with water: after 5 times, it was dried at 80°C and melted and extruded at 150°C to obtain -SO 2 Perfluorosulfonic acid precursor resin of F group, wherein the molar ratio of initiator to fluorine-containing compound is 2:1;

[0056] (2) According to the ratio of adding 35ml of cobalt-containing NaOH aqueous solution per gram of perfluorosulfon...

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Abstract

The invention discloses a method and a device for purifying hydrogen cyanide industrial waste gas by electrodialysis. The method comprises the steps as follows: filling the hydrogen cyanide waste gas into a cathode, and purifying the hydrogen cyanide waste gas by utilizing free radicals with strong oxidizing property generated by electro-fenton reaction at the cathode; purifying and concentrating part of cyanide ions which are not fully oxidized by utilizing the selective permeability of a cobalt-containing perfluoro-sulfonate ion exchange membrane at an anode; and adding hydrocyanic acid purified and concentrated at the anode with different types of salts to prepare cyanide which is low in toxicity and easy to store and transport. According to the method, the liquid phase adsorption capacity is increased, the harmful gas purifying capacity can be increased by utilizing the liquid phase adsorption, electrodialysis and ion exchange principles while higher gas purifying rate is obtained, the generated gas such as NH3, H2, O2 or the like can serve as a raw material for other industrial production, high-toxicity high-risk byproducts are prevented being generated in the purifying process, and byproducts with higher added values can be obtained by an enriching and depositing method.

Description

technical field [0001] The invention relates to a method and a device for purifying industrial waste gas with hydrogen cyanide by using electrodialysis technology, belonging to the field of environmental engineering. Background technique [0002] The molecular formula of hydrogen cyanide is HCN, and its molecular weight is 27.03. It is a colorless and transparent liquid, highly volatile, with a bitter almond smell, a flash point of 17.8°C, a boiling point of 25.7°C, a melting point of -13.4°C, and a relative density of 0.6884. Miscible with water, and soluble in ethanol, ether, glycerin, benzene, chloroform, etc. Many industrial waste gases contain more hydrogen cyanide, such as coke oven gas (containing HCN 0.5-1.5g / m 3 ), calcium carbide furnace gas (containing HCN 3-4g / m 3 ), yellow phosphorus tail gas (containing HCN 0.l-0.2 g / m 3 ), as well as the manufacture of acrylonitrile, acrylic resin, pesticides and insecticides, and other occasions that are engaged in the pr...

Claims

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Application Information

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IPC IPC(8): B01D53/22
Inventor 宁平于勇涛瞿广飞林奕璐
Owner KUNMING UNIV OF SCI & TECH
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