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Method and device for purifying phosphorus, sulfur and cyanogen under synergetic action of electrochemical oxidation and liquid phase catalytic oxidation

A liquid-phase catalytic and electrochemical technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems that have not been reported on the synchronous deep purification technology of phosphorus, sulfur, and cyanide, and achieve mild operating conditions , reduce equipment and costs, simple process

Active Publication Date: 2014-02-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no report on the research on the synchronous deep purification technology of phosphorus, sulfur and cyanide

Method used

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  • Method and device for purifying phosphorus, sulfur and cyanogen under synergetic action of electrochemical oxidation and liquid phase catalytic oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, yellow phosphorus tail gas (the main component volume percentage is composed of CO 85%-90%, CO 2 1%-4%, H 2 1%-8%, N 2 2%-5%, H 2 O 2%-5%, pH 3 400-1400mg / m 3 、H 2 S 800-3000mg / Nm 3 、HCN 100-300mg / Nm 3) as the treatment object, under normal pressure, the mixed gas containing one or more of phosphine, hydrogen sulfide, and hydrogen cyanide is treated through the joint action of electrochemical oxidation and liquid-phase catalyst catalytic oxidation, and the phosphorus Hydrogen sulfide, hydrogen sulfide, and hydrogen cyanide are respectively oxidized to phosphoric acid, elemental sulfur, carbon dioxide, nitrogen or ammonia, combined with electrodialysis to purify the mixed gas while enriching, concentrating, and separating catalytic oxidation products. The reaction temperature is 4°C, and the electrochemical reaction The power supply method is pulse, and the current density is 30A / m 2 .

[0023] In this embodiment, the following device is ...

Embodiment 2

[0027] In this embodiment, the tail gas of the closed calcium carbide furnace (the main component volume percentage is composed of CO 80%-85%, H 2 6%-8%, CO 2 1%-3%, O 2 1.5%-3.5%, N 2 6%-8%, pH 3 200-950mg / m 3 、H 2 S 300-900mg / Nm 3 、HCN 1500-3000mg / Nm 3 ) as the treatment object, under normal pressure, the mixed gas containing one or more of phosphine, hydrogen sulfide, and hydrogen cyanide is treated through the joint action of electrochemical oxidation and liquid-phase catalyst catalytic oxidation, and the phosphorus Hydrogen sulfide, hydrogen sulfide, and hydrogen cyanide are oxidized to phosphoric acid, elemental sulfur, carbon dioxide, nitrogen or ammonia, respectively, combined with electrodialysis to purify the mixed gas while enriching, concentrating, and separating catalytic oxidation products. The reaction temperature is 40°C, and the electrochemical reaction The power supply method is pulse, and the current density is 100A / m 2 .

[0028] In this embod...

Embodiment 3

[0032] In this embodiment, the tail gas produced in the semiconductor industry is used as the treatment object. Under normal pressure, the exhaust gas containing one or more of phosphine, hydrogen sulfide, and hydrogen cyanide will be processed through the joint action of electrochemical oxidation and liquid-phase catalyst catalytic oxidation. The mixed gas is treated to oxidize phosphine, hydrogen sulfide, and hydrogen cyanide into phosphoric acid, elemental sulfur, carbon dioxide, nitrogen or ammonia, and combined with electrodialysis to purify the mixed gas while enriching, concentrating, and separating catalytic oxidation products. The reaction temperature The temperature is 60°C, the power supply mode of the electrochemical reaction is direct current, and the current density is 400A / m 2 .

[0033] In this embodiment, the following device is used to complete the method for purifying phosphorus thiocyanate by electrochemical synergistic liquid-phase catalytic oxidation. Pl...

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Abstract

The invention discloses a method and a device for purifying phosphorus, sulfur and cyanogen under synergetic action of electrochemistry and liquid phase catalytic oxidation. The method and the device are used for processing the mixed gas of one or more of phosphorus, sulfur and cyanogen under the combined action of electrochemical oxidation and liquid phase catalytic oxidation; after the processing, phosphorus, sulfur and cyanogen are oxidized into phosphoric acid, single-element sulfur, carbon dioxide and nitrogen or ammonia gas, respectively. The method and the device provided by the invention are simple in process flow, and the process flow is carried out at a low temperature under normal pressure; the products are easy to separate; and the phosphoric acid, the single-element sulfur and the like can be further utilized.

Description

technical field [0001] The invention relates to a method and a device for purifying phosphorus thiocyanate by electrochemical cooperative liquid-phase catalytic oxidation, and belongs to the technical field of separation and purification of toxic polluting gases and environmental protection engineering. Background technique [0002] The deep purification of phosphorus, sulfur and cyanide is not only of great significance to environmental pollution control and greenhouse gas emission reduction, but also can improve the level of purification technology, promote the adjustment of industrial structure in underdeveloped western regions, and promote the resource utilization and comprehensive utilization of mixed gas, resulting in significant The economic benefits of phosphorus (PH 3 ), sulfur (H 2 S), cyanide (HCN), as highly toxic and odorous pollutants, will exist in the tail gas emitted by many industrial productions, such as biomass cracking, coal coking, coal liquefaction, c...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/46B01D53/52B01D53/74
Inventor 瞿广飞李军燕宁平马懿星于勇涛
Owner KUNMING UNIV OF SCI & TECH