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Method for absorbing hydrogen sulfide gas by using ionic liquid

A technology of ionic liquid and hydrogen sulfide, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of long synthesis process, high cost of ionic liquid, and high investment and operation costs, and achieve simple synthesis process and low raw material price Inexpensive, good environmental benefits

Inactive Publication Date: 2011-02-02
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, H removal at home and abroad 2 S technology is relatively mature, H removal 2 S method and H removal 2 There are many S processes, mainly dry and wet deH 2 S process; however, after careful study, it was found that both dry and wet deH 2 S, there are deficiencies: dry deH 2 S efficiency is not high, deH 2 It is difficult to regenerate S reagent, and its sulfur capacity is relatively low, so it is mainly suitable for fine deH at low concentration. 2 S; wet deH 2 Although the processing capacity of S is large, the removal of H 2 S has high efficiency and can be operated continuously, but the investment and operation costs are also high, and it is easy to cause secondary pollution
Many of the ionic liquids currently being studied are sensitive to H 2 The solubility of S is small, and there are limitations such as high viscosity, high cost of ionic liquid, long synthesis process, and serious pollution in the synthesis process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take by weighing 0.1 mole of caprolactam and 0.1 mole of tetrabutylammonium bromide, caprolactam is added in the reactor, open stirrer and stir, stirring speed is 100rpm, add whole tetrabutylammonium bromide, in 25 °C for 10 h, and then the resulting liquid was dried in a vacuum oven at 80 °C for 1 h.

[0020] Place the obtained caprolactam-tetrabutylammonium bromide ionic liquid in an absorber, place a stirring rotor in the absorber, keep the temperature at 20°C, and feed H into the absorber at a speed of 10mL / min. 2 S gas, the ionic liquid absorbs H 2 The pressure of S is normal pressure, the tail gas is absorbed by sodium hydroxide solution, and the weight of the absorber is weighed every 0.5h until the constant weight, after equilibrium, H 2 The mole fraction of S in the ionic liquid is 0.20. h 2 S mole fraction refers to H 2 The ratio of the moles of S to the moles of hydrogen sulfide and all components of the ionic liquid.

Embodiment 2

[0022] Weigh 1.0 mole of caprolactam and 0.1 mole of tetrabutylammonium fluoride, add caprolactam into the reaction kettle, turn on the stirrer, stir at 500rpm, add all the tetrabutylammonium fluoride, The reaction was carried out for 3 hours, and then the obtained liquid was dried in a vacuum oven at 20° C. for 10 hours to obtain caprolactam-tetrabutylammonium fluoride ionic liquid.

[0023] Place the obtained caprolactam-tetrabutylammonium fluoride ionic liquid in an absorber, place a stirring rotor in the absorber, keep the temperature at 50°C, and feed H into the absorber at a rate of 10mL / min. 2 S gas, the ionic liquid absorbs H 2 The pressure of S is normal pressure, the tail gas is absorbed by sodium hydroxide solution, and the weight of the absorber is weighed every 0.5h until the constant weight, after equilibrium, H 2 The mole fraction of S in the ionic liquid is 0.30.

Embodiment 3

[0025] Take by weighing 0.5 mole caprolactam and 0.1 mole tetrabutylammonium chloride, caprolactam is added in the reactor, open agitator and stir, stirring speed is 300rpm, add whole tetrabutylammonium chloride, at 100 The reaction was carried out at ℃ for 1 h, and then the obtained liquid was dried in a vacuum oven at 50° C. for 5 h to obtain caprolactam-tetrabutylammonium chloride ionic liquid.

[0026] Place the obtained caprolactam-tetrabutylammonium chloride ionic liquid in an absorber, place a stirring rotor in the absorber, keep the temperature at 150°C, and feed H into the absorber at a speed of 10mL / min. 2 S gas, the ionic liquid absorbs H 2 The pressure of S is normal pressure, the tail gas is absorbed by sodium hydroxide solution, and the weight of the absorber is weighed every 0.5h until the constant weight, after equilibrium, H 2 The mole fraction of S in the ionic liquid is 0.12.

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PUM

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Abstract

The invention provides a method for absorbing hydrogen sulfide gas by using ionic liquid. The method comprises the following steps of: uniformly mixing one of alkyl ammonium halide, ammonium thiocyanate, ammonium chloride, ammonium bromide or acetylcholine and caprolactam according to a molar ratio of 1:1-10; reacting at the temperature of between 25 and 120 DEG C for 1 to 10 hours; drying the liquid in vacuum at the temperature of between 20 and 80 DEG C for 1 to 10 hours to obtain the ionic liquid; and introducing the hydrogen sulfide gas into the ionic liquid at the temperature of between 20 and 150 DEG C. The method has the characteristics of simple process, small investment, high absorption ratio, no pollution, and low energy consumption, is suitable for industrial production and meets the requirement of development of environmentally-friendly chemistry at present.

Description

technical field [0001] The invention belongs to the technical field of organic waste gas treatment methods, and in particular relates to a method for absorbing hydrogen sulfide gas by using an ionic liquid. Background technique [0002] Hydrogen sulfide gas (H 2 S) As one of the main pollutants in the atmosphere, it is a highly irritating and highly toxic odorous gas. Under aerobic and humid heat conditions, it will cause equipment and pipeline corrosion, catalyst poisoning, and seriously threaten personal safety. With the development of the economy and the enhancement of people's awareness of environmental protection, the problem of bad smell has attracted more and more attention. At the same time, the country has also formulated corresponding laws and regulations, especially for H 2 S emissions are strictly limited. At present, H removal at home and abroad 2 S technology is relatively mature, H removal 2 S method and H removal 2 There are many S processes, mainly dry ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52
Inventor 段二红郭斌任爱玲
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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