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A method for realizing desulfurization of sodium sulfide-containing wastewater by using multi-acid ionic liquid

Active Publication Date: 2020-09-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that existing sodium sulfide-containing wastewater sulfur treatment steps have poor adaptability of catalyst heterogeneous media, easy poisoning and separation difficulties, resulting in complicated operation and difficult separation of final desulfurization products, and provide a multi-acid based Desulfurization method of leather wastewater by ionic liquid

Method used

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  • A method for realizing desulfurization of sodium sulfide-containing wastewater by using multi-acid ionic liquid
  • A method for realizing desulfurization of sodium sulfide-containing wastewater by using multi-acid ionic liquid
  • A method for realizing desulfurization of sodium sulfide-containing wastewater by using multi-acid ionic liquid

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specific Embodiment approach 1

[0016] Specific embodiment one: This embodiment is a method for utilizing polyacid ionic liquids to realize the desulfurization of sodium sulfide-containing wastewater, specifically as follows:

[0017] Dissolving the polyacid ionic liquid in the medium solvent to obtain the polyacid ionic liquid medium solution, then adding the polyacid ionic liquid medium solution into the sodium sulfide-containing wastewater, stirring and reacting for 0.5h to 3h under light conditions, and filtering to obtain solid sulfur, That is to complete the desulfurization of sodium sulfide-containing wastewater; the mass of the polyacid ionic liquid and the volume ratio of the medium solvent is 4mg: (2 ~ 3) mL; sodium sulfide and polyacid ionic liquid medium solution The molar ratio of the polyacid ionic liquid is (8-10):1.

[0018] This embodiment uses the desulfurization method of multi-acid ionic liquid, which belongs to a new green and efficient desulfurization process of sodium sulfide-containin...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is: described polyacid ionic liquid is (C 33 h 32 N 3 ) 4 α-SiMo 12 o 40 , (C 33 h 32 N 3 ) 4 α-S 2 W 18 o 62 , (C 32 h 68 N) 4 α-S 2 W 18 o 62 or (C 32 h 68 N) 4 α-S 2 Mo 18 o 62 . Others are the same as the first embodiment.

[0023] when (C 33 h 32 N 3 ) 4 α-SiMo 12 o 40 When used as a multi-acid ionic liquid, the reaction mechanism is as follows:

[0024] SiMo 12 VI o 40 4- +S 2- →SiMo 10 VI Mo 2 V o 40 6- +S↓

[0025] SiMo 10 VI Mo 2 V o 40 6- +S 2- →SiMo 8 VI Mo 4 V o 40 8- +S↓

[0026] SiMo 8 VI Mo 4 V o 40 8- +S 2- →SiMo 6 VI Mo 6 V o 40 10- +S↓

[0027] SiMo 6 VI Mo 6 V o 40 10- +S 2- →SiMo 4 VI Mo 8 V o 40 12- +S↓

[0028] SiMo 4 VI Mo 8 V o 40 12- +S 2- →SiMo 2 VI Mo 10 V o 40 14- +S↓

[0029] SiMo 2 VI Mo 10 V o 4014- +S 2- →SiMo 12 V o 40 16- +S↓

[0030] SiMo...

specific Embodiment approach 3

[0102] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the medium solvent is water, ethanol medium solvent or acetonitrile medium solvent, and the ethanol medium solvent is ethanol / water solution, and ethanol / water solution It is formed by mixing ethanol and water at a volume ratio of 1:1; the acetonitrile medium solvent is acetonitrile / water solution, and the acetonitrile / water solution is formed by mixing acetonitrile and water at a volume ratio of 1:1. Others are the same as those in Embodiment 1 or 2.

[0103] When the medium solvent is water: regeneration method Ⅰ

[0104] To the filtrate obtained by filtering in this embodiment, add 30% hydrogen peroxide by mass fraction or directly feed air for 20min to 50min, the volume ratio of 30% hydrogen peroxide to medium solvent (water) by mass fraction is 1:1, complete The recovery of the ionic liquid-aqueous medium solvent is completed.

[0105] When the medium solvent ...

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Abstract

The invention relates to a method for desulfurization of sodium sulfide containing wastewater, in particular to a method of utilizing polyacid ion liquid to realize desulfurization of the sodium sulfide containing wastewater, and aims to solve the problems that operation is complex and a final desulfurization product is difficult to separate due to the fact that existing sodium sulfide containing wastewater sulfur treatment steps are low in catalyst multiphase medium adaptability, prone to intoxication and difficult in separation. The method includes: dissolving the polyacid ion liquid into a medium solvent to obtain a polyacid ion liquid medium solution; adding the polyacid ion liquid medium solution into the sodium sulfide containing wastewater, stirring for reaction under illumination, and filtering to obtain solid sulfur to complete desulfurization of the sodium sulfide containing wastewater. The method has the advantages that liquid-phase sulfur ion desulfurization efficiency of the method can reach higher than 80%, and sulfur ions in the sodium sulfide containing wastewater are directly oxidized into an economic product-sulfur; the ion liquid can be regenerated and recycled; the method is suitable for large-scale industrial application. The method is mainly used for treating the sodium sulfide containing wastewater.

Description

technical field [0001] The invention relates to a method for desulfurizing sodium sulfide-containing wastewater. Background technique [0002] Sodium sulfide-containing wastewater is one of the important sources of water pollution. It is not only a large amount, but also a complex composition with high concentration of S 2- of organic wastewater. The traditional desulfurization process mainly targets H 2 S Industrial waste gas (tail gas) is divided into dry desulfurization and wet desulfurization, but there are problems such as complex operation, low efficiency, loss of catalyst, and use of toxic substances. Moreover, regardless of dry desulfurization or wet desulfurization, it is difficult to deal with dissolved H 2 S, that is, sulfur ion. Moreover, leather wastewater has many components and is rich in a large amount of organic matter. The existing sulfur treatment steps of sodium sulfide-containing wastewater have problems such as poor adaptability of catalyst multi-ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F101/10C02F103/24
CPCC02F1/30C02F1/32C02F1/72C02F2101/101C02F2103/24
Inventor 李春香袁青雷斌
Owner HARBIN INST OF TECH
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