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Method for regenerating ionic liquid containing sulfuric acid

An ionic liquid and sulfuric acid technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems affecting the application of ionic liquids, decrease in absorption, and inability to remove sulfuric acid, and achieve the effect of regeneration and reuse.

Active Publication Date: 2013-03-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an environmentally friendly green solvent, ionic liquids have shown good results in flue gas desulfurization, but these ionic liquids have partially absorbed SO due to the presence of oxygen during the desulfurization process. 2 It is oxidized and generates sulfuric acid under the action of water. After the absorption, the generated sulfuric acid cannot be removed by traditional regeneration methods such as heating and decompression, resulting in a large amount of sulfuric acid enriched in the ionic liquid.
The enriched sulfuric acid makes the ionic liquid to SO 2 The absorption of ionic liquids dropped sharply, seriously affecting the application of ionic liquids in flue gas desulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, sodium hydroxide is used to remove the sulfuric acid in the ethanolamine lactate ionic liquid containing sulfuric acid, so as to realize the regeneration of the ethanolamine lactate ionic liquid.

[0025] The specific operation steps are: take 5 g of ethanolamine lactate with a sulfuric acid mass content of 5% and put it in a test tube, add 0.204 g of sodium hydroxide and 0.5 g of water, and blow the mixed solution with nitrogen at a temperature of 90 ° C. Sweep for 2 hours, solids are precipitated, add a small amount of ethanol to the ionic liquid after purging, filter to obtain an ethanol solution of sodium sulfate solid and ethanolamine lactate, and distill the ethanol solution of ethanolamine lactate under reduced pressure to obtain ethanolamine milk salt. The obtained ethanolamine lactate ionic liquid was tested, and the mass fraction of sulfuric acid was 0.09%.

[0026]

Embodiment 2

[0028] In this embodiment, calcium oxide solids are used to remove sulfuric acid in the tetramethylguanidine lactate ionic liquid containing sulfuric acid, so as to realize the regeneration of the tetramethylguanidine lactate ionic liquid.

[0029] The specific operation steps are: take 5 g of tetramethylguanidine lactate with a sulfuric acid mass content of 15% and place it in a test tube, add 0.431 g of calcium oxide solids and 0.5 g of water, calcium sulfate solids are precipitated, and pass the ionic liquid mixture through The way of centrifugation separates the tetramethylguanidine lactate aqueous solution and the calcium sulfate solid. The aqueous solution of tetramethylguanidine lactate is distilled under reduced pressure to obtain tetramethylguanidine lactate. The obtained tetramethylguanidine lactate ionic liquid was tested, and the mass fraction of sulfuric acid was 0.07%.

[0030]

Embodiment 3

[0032] In this embodiment, barium hydroxide solid is used to remove sulfuric acid in the ethanolamine lactate ionic liquid containing sulfuric acid, so as to realize the regeneration of the ethanolamine lactate ionic liquid.

[0033] The specific operation steps are as follows: under the condition of 20°C, take 5 g of ethanolamine lactate with a mass content of 10% sulfuric acid in a test tube, add 0.872 g of barium hydroxide solid and 0.5 g of water, solids are precipitated, and the ionic liquid mixture Filtration is performed to separate the ethanolamine lactate aqueous solution from the barium sulfate solid, and the ethanolamine lactate aqueous solution is heated and vacuumed to remove the water in the ionic liquid to obtain the ethanolamine lactate ionic liquid. The obtained ethanolamine lactate ionic liquid was tested, and the mass fraction of sulfuric acid was 0.02%.

[0034]

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PUM

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Abstract

The invention provides a method for regenerating an ionic liquid containing sulfuric acid. The method comprises the following steps of: adding an inorganic substance into an ionic liquid containing sulfuric acid, and enabling the inorganic substance to react with the ionic liquid containing sulfuric acid at the temperature of 0-150 DEG C, wherein the optimally-selected temperature is 20-100 DEG C; and further making the sulfuric acid in the ionic liquid separate from the ionic liquid in a form of solid sulfate so as to obtain the ionic liquid without the sulfuric acid. The method provided by the invention effectively eliminates the sulfuric acid in the ionic liquid, prevents sulfuric acid generated by sulfur dioxide oxidation in the ionic liquid desulfurization process from generating negative effects on the ionic liquid desulfurization, and realizes the regeneration of the ionic liquid.

Description

technical field [0001] The invention relates to a method for regenerating an ionic liquid, in particular to a method for regenerating an ionic liquid containing sulfuric acid. Background technique [0002] Ionic liquid is a kind of organic molten salt, which is composed of organic cations and inorganic or organic anions, and is liquid at room temperature or near room temperature. It evolved from traditional high-temperature molten salts, but compared to conventional ionic compounds, ionic liquids are liquid in a wide temperature range around room temperature. Ionic liquids have many excellent properties: a wide range of liquid temperature, from below or close to room temperature to above 300 °C, good thermal and chemical stability; almost no vapor pressure; adjustable structure and controllable properties of ionic liquids ;Exhibits good solubility for many organic and inorganic substances, and can dissolve a variety of gases, such as CO 2 , SO 2 , ethylene, ethane, etc. ...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 吴卫泽任树行
Owner BEIJING UNIV OF CHEM TECH
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