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Method for preparing carbonyl sulfide removal ionic liquid mixtures

A technology of ionic liquid and carbonyl sulfide, applied in the direction of separation methods, chemical instruments and methods, reagents, etc., can solve the problem of low removal rate and achieve the effect of simple preparation process, good solubility and high yield

Pending Publication Date: 2018-07-27
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of the ionic liquid compounding agent for removing carbonyl sulfide, this preparation method for the ionic liquid compounding The problem that the removal rate of COS is very low during the treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of this ionic liquid complex agent for removing carbonyl sulfide:

[0023] 41.1g of n-bromobutane (C 4 h 9 Br) Constant pressure was added dropwise to 24.6g N-methylimidazole ( ), 25 o After uniformly stirring and fully reacting for 6 hours at C, the liquid after the reaction was stirred at 70 o Purification by rotary evaporation under vacuum at C, the product was washed 3 times with ether, and the resulting viscous liquid was washed at 100 o Under drying 8h under C, obtain 1-butyl-3-methylimidazolium hydrobromide ( ) ionic liquid.

[0024] The composition of the ionic liquid compound is in terms of mass fraction: 20 wt %1-Butyl-3-methylimidazolium hydrobromide ( ) ionic liquid, 20 wt % Methyldiethanolamine (MDEA), 5 wt % Diisopropanolamine (DIPA), 20 wt % Sulfolane ( ), 35 wt %water.

[0025] The absorption temperature is 30 o C, the space velocity of sulfur tail gas is 8 h -1 , after being absorbed by the ionic liquid compou...

Embodiment 2

[0027] The preparation method of this ionic liquid complex agent for removing carbonyl sulfide:

[0028] 11.7 g of n-octane bromide C 8 h 17 Br was added dropwise at constant pressure to 5g N-methylpyrrolidine ( ), 70 o After uniformly stirring and fully reacting for 24 hours at C, the liquid after the reaction was stirred at 70 o Purification by rotary evaporation under vacuum at C, the product was washed 3 times with ether, and the resulting viscous liquid was washed at 100 o C for 6 hours. Available N-methyl-N-octylpyrrole hydrobromide ( ) ionic liquid.

[0029] The composition of the ionic liquid compound is calculated as mass fraction: 25 wt % N-methyl-N-octylpyrrole hydrobromide ( ) ionic liquid, 30 wt % Methyldiethanolamine (MDEA), 20 wt % Dimethylsulfoxide (DMSO), 25 wt %water.

[0030] The absorption temperature is 40 o C, the space velocity of sulfur tail gas is 6 h -1 , after being absorbed by the ionic liquid compound, the content of COS in the s...

Embodiment 3

[0032] The preparation method of this ionic liquid complex agent for removing carbonyl sulfide:

[0033] 20.5g of chlorododecane C 12 h 25 Cl was added dropwise at constant pressure to 6.2g pyridine ( ), 100 o C under uniform stirring and sufficient reaction for 6h, the solution after the reaction at 80 o Purification by rotary evaporation under vacuum at C, the product was washed 3 times with ether, and the obtained golden yellow viscous liquid was heated at 110 o C for 8 hours. Available N-dodecyl-pyridine hydrochloride ( ) ionic liquid.

[0034] The ionic liquid compound is calculated as mass fraction: 18 wt % N-dodecyl-pyridine hydrochloride ( ) ionic liquid, 30 wt % Methyldiethanolamine (MDEA), 15 wt % Sulfolane ( ), 35 wt %water.

[0035] The absorption temperature is 40 o C, the space velocity of sulfur tail gas is 7 h -1 , after being absorbed by the ionic liquid compound, the content of COS in the sulfur tail gas is changed from 48mg / m 3 down to ...

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PUM

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Abstract

The invention relates to a method for preparing carbonyl sulfide removal ionic liquid mixtures. The method particularly includes dropwise adding halogenated hydrocarbon compounds B into nitrogen-containing organic compounds A under the constant pressures, carrying out sufficient reaction, and then carrying out vacuum rotary evaporation purification, washing and drying to obtain C+X- ionic liquid;mixing alcohol amine solution, the prepared ionic liquid, absorption reinforcing agents and water with one another to obtain the carbonyl sulfide removal ionic liquid mixtures. A molar ratio of the nitrogen-containing organic compounds A to the halogenated hydrocarbon compounds B is 1:1-1:3. C+ of the C+X- ionic liquid represents nitrogen-containing cations, and X- of the C+X- ionic liquid represents halogen anions. The carbonyl sulfide removal ionic liquid mixtures comprises, by weight, 10wt%-30wt% of ionic liquid, 10wt%-50wt% of alcohol amine solution, 15wt%-50wt% of absorption reinforcing agents and the balance water. The method has the advantage that the carbonyl sulfide removal rate of the carbonyl sulfide removal ionic liquid mixtures prepared by the aid of the method can reach 80%-99.5%.

Description

technical field [0001] The invention relates to the field of sulfur tail gas purification, in particular to a preparation method of an ionic liquid compound agent for removing carbonyl sulfide. Background technique [0002] Sulfur tail gas is the tail gas discharged from the sulfur production unit after the acid gas in the petroleum refining industry passes through the sulfur recovery unit, which contains H 2 S, SO 2 , COS, CS 2 and sulfur-containing components such as elemental sulfur vapor. At present, the treatment process of sulfur tail gas is to convert various forms of sulfur into H through hydrogenation reduction. 2 S, and then use alcohol amine solution to absorb and remove most of the H 2 S to achieve tail gas purification, the purified tail gas is converted into less toxic SO by incineration 2 High-altitude discharge afterward. [0003] In actual working conditions, when hydrogenation is used to reduce sulfides, COS cannot be completely converted into H due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/48B01D53/78C07D233/58
CPCB01D53/1493B01D53/485B01D53/78C07D233/58B01D2252/504B01D2252/30B01D2257/308Y02P20/151
Inventor 苑丹丹宋华陈彦广李锋张娇静赵亮郝天臻高金森
Owner NORTHEAST GASOLINEEUM UNIV
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