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Method for alkaline non-aqueous wet-process catalytic oxidation of hydrogen sulfide

A technology for catalytic oxidation and hydrogen sulfide, applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve problems such as slow regeneration speed, increased operating costs, and equipment corrosion

Inactive Publication Date: 2018-03-20
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But [bmim] FeCl 4 The strong acidity of ionic liquids leads to low sulfur capacity and iron utilization, which increases operating costs, while [bmim]FeCl 4 The regeneration rate of ionic liquid after hydrogen sulfide oxidation is extremely slow, which further increases the operating cost. In addition, [bmim]FeCl 4 Ionic liquids are very corrosive to equipment due to chlorine and strong acidity

Method used

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  • Method for alkaline non-aqueous wet-process catalytic oxidation of hydrogen sulfide
  • Method for alkaline non-aqueous wet-process catalytic oxidation of hydrogen sulfide
  • Method for alkaline non-aqueous wet-process catalytic oxidation of hydrogen sulfide

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Experimental program
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Embodiment approach

[0026] (1) The gas containing hydrogen sulfide includes natural gas, biogas, refinery tail gas, shale gas and other gases containing hydrogen sulfide, and 0%<volume concentration of hydrogen sulfide≤100%.

[0027] (2) The disubstituted alkylimidazole hydroxide is 1,3-dialkylimidazole hydroxide, 1-alkenyl-3-alkylimidazole hydroxide, 1-benzyl-3-alkylimidazole hydroxide and At least one of 1-benzyl-3-enylimidazoles, wherein the alkyl group contains 1-16 carbons, and the alkene group contains 2-8 carbons. And the pH value of the alkaline ionic liquid is lower than 10.

[0028] (3) The organic solvent with a boiling point higher than 150°C can be N,N-dimethylformamide (DMF), N-dimethylpyrrolidone (NMP), dimethyl sulfoxide (DMSO) in the prior art , at least one of 1,3-dimethyl-2-imidazolidinone (DMI).

[0029] (4) The use of the iron-based ionic liquid desulfurization solution to carry out the catalytic oxidation treatment of the gas containing hydrogen sulfide can include the fol...

Embodiment 1

[0036] A kind of method of basic non-aqueous phase wet catalytic oxidation hydrogen sulfide, comprises the following steps:

[0037] Step A1. Dissolve 2.10 mol (about 83.9937 g) of sodium hydroxide in 100 mL of deionized water, and dissolve 0.70 mol (about 189.2073 g) of ferric chloride in an appropriate amount of deionized water, then mix the two, fully stir, and Filtration resulted in precipitation of ferric hydroxide. The ferric hydroxide precipitate was washed three times with tap water, and fresh ferric hydroxide solution was obtained after suction filtration.

[0038] Step B1. Add 204.5680g of ethylenediaminetetraacetic acid (H4EDTA) to the ferric hydroxide solution just prepared in step A1, add 300mL of deionized water, heat and boil until the solution is brown and transparent, and then get Iron ethylenediaminetetraacetate (Fe-EDAT) aqueous solution.

[0039] Step C1, dissolve 16.0608g of potassium hydroxide in 80ml of ethanol, and stir to form a suspension, then add ...

Embodiment 2

[0047] A kind of method of basic non-aqueous phase wet catalytic oxidation hydrogen sulfide, comprises the following steps:

[0048] Step A2. Dissolve 2.10 mol (about 83.9937 g) of sodium hydroxide in 100 mL of deionized water, dissolve 0.70 mol (about 189.2073 g) of ferric chloride in an appropriate amount of deionized water, then mix the two, fully stir, and Filtration resulted in precipitation of ferric hydroxide. The ferric hydroxide precipitate was washed three times with tap water, and fresh ferric hydroxide solution was obtained after suction filtration.

[0049] Step B2, add 204.5680g of ethylenediaminetetraacetic acid (H4EDTA) to the ferric hydroxide solution just prepared in step A2, add 300mL of deionized water, heat and boil until the solution is a brown transparent solution, and then obtain after cooling Iron ethylenediaminetetraacetate (Fe-EDAT) aqueous solution.

[0050] Step C2, dissolving 16.0608g of potassium hydroxide in 80ml of ethanol, and stirring to fo...

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Abstract

The invention discloses a method for alkaline non-aqueous wet-process catalytic oxidation of hydrogen sulfide. The method is as follows: mixing ethylenediamine tetreaceticacid ferric and disubstitutedalkyl imidazole hydroxide to form a basic ionic liquid, evaporating moisture in the basic ionic liquid to dry, dissolving in an organic solvent having a boiling point higher than 150 DEG C to preparean iron-based ionic liquid desulfurization liquid; and using the iron-based ionic liquid desulfurization solution for catalytic oxidation of the hydrogen sulfide gas. The method has the advantages ofhigh sulfur yield, fast catalytic oxidation reaction speed, low corrosion to equipment, and removal of carbon dioxide, moisture and other impurities in the gas while catalytic oxidation of the hydrogen sulfide.

Description

technical field [0001] The invention relates to the technical field of hydrogen sulfide treatment, in particular to an alkaline non-aqueous phase wet catalytic oxidation method for hydrogen sulfide. Background technique [0002] The complex iron aqueous solution catalytic-oxidation hydrogen sulfide system has the advantages of high desulfurization efficiency, safety, non-toxicity and simple process. Its mainstream LO-CAT (Liquid oxidation catalyst, liquid phase catalytic oxidation) process is not only used in natural gas purification and desulfurization It has the most applications and has also been successfully applied in the desulfurization of shale gas. However, its application in natural gas desulfurization in China shows that in order to ensure its normal operation, iron complexing agents, complex iron stabilizers, bacterial inhibitors, surfactants and other USFilter patented reagents need to be added regularly, resulting in quite high operating costs. The high operati...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/52B01D53/96B01D53/14B01D53/26C10L3/10
CPCB01D53/1475B01D53/1493B01D53/263B01D53/8612B01D53/90B01D53/96B01D2251/80B01D2252/30B01D2252/40B01D2255/705B01D2258/02B01D2258/05C10L3/103C10L3/104C10L3/106Y02C20/40
Inventor 王建宏赵馨怡
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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