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Method of separating olefins/alkanes via eutectic solvent based on protonated ionic liquid

A technology of deep eutectic solvent and protonated ions, which is applied in the field of chemical technology and gas separation and purification, to achieve the effect of easy regulation, convenient regulation and easy access to raw materials

Active Publication Date: 2017-10-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a method for separating olefins / alkanes using a protonated ionic liquid-based deep eutectic solvent, which overcomes the pollution of olefins by traditional absorbents with the zero volatility and high stability of the deep eutectic solvent problems, reduce environmental pollution, easy to recycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The experimental device for synthesizing ionic liquids is mainly a three-necked flask with a condensing reflux tube on the top and a dropping funnel and a stirring device. Dissolve the accurately weighed 49.2545g ethanolamine in anhydrous methanol and place it in the flask, and turn on the stirrer to stir. Under high-speed stirring, add nitric acid solution (78.1705g, 65.0%) drop by drop, the molar weight of nitric acid and ethanolamine Equal, dripping in 60 minutes. And react at 40° C. for 4 hours. After the reaction, part of the solvent was removed by rotary evaporation, crystallized at 0°C, filtered with suction to obtain white crystals, and finally dried in a vacuum oven at 60°C for 12 hours to obtain ethanolamine nitrate.

[0044] Accurately weighed 7.7413g of ethanolamine nitrate protonated ionic liquid was placed in a single-necked bottle, 5.7449g of glycerol was added at a molar ratio of 1:1, and magnetically stirred at 60°C for 4 hours to obtain a colorless and ...

Embodiment 2

[0052] The experimental device for synthesizing ionic liquids is mainly a three-necked flask with a condensing reflux tube on the top and a dropping funnel and a stirring device. Will accurately weigh 114.4455g dimethylamine aqueous solution (30wt%) and be placed in the flask, and open stirrer and stir, under high-speed stirring, dropwise add nitric acid solution (79.084g, 65.0%), the molar weight of nitric acid Equal to dimethylamine, it will be dropped within 60 minutes. And react at 25°C for 8h. After the reaction, part of the solvent was removed by rotary evaporation, crystallized at 0°C, filtered with suction to obtain white crystals, and finally dried in a vacuum oven at 65°C for 12 hours to obtain dimethylamine nitrate.

[0053] Accurately weighed 3.5471g of dimethylamine nitrate protonated ionic liquid was placed in a single-necked bottle, 2.0369g of ethylene glycol was added at a molar ratio of 1:1, and magnetically stirred at 60°C for 2h to obtain a colorless and tr...

Embodiment 3

[0055] The experimental device for synthesizing ionic liquids is mainly a three-necked flask with a condensing reflux tube on the top and a dropping funnel and a stirring device. Accurately weighed 59.9733g triethylamine is dissolved in anhydrous methanol and placed in the flask, and the stirrer is opened to stir, and under high-speed stirring, nitric acid solution (57.4535g, 65.0%) is added dropwise, the molar amount of nitric acid Equal to triethylamine, it will be dropped within 60 minutes. And react at 40°C for 8h. After the reaction was completed, part of the solvent was removed by rotary evaporation, crystallized at 0°C, and suction filtered to obtain white crystals, which were finally dried in a vacuum oven at 65°C for 12 hours to obtain triethylamine nitrate protonated ionic liquid.

[0056] Accurately weighed 16.42 g of triethylamine nitrate protonated ionic liquid was placed in a single-necked bottle, 9.209 g of glycerol was added at a molar ratio of 1:1, and magnet...

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Abstract

The invention provides a method of separating olefins / alkanes via a eutectic solvent based on protonated ionic liquid; the method comprises the steps of preparing the protonated ionic liquid with an imidazole, amine or amide organic matter and an inorganic acid in the molar ratio of 1:1; (2) mixing the protonated ionic liquid prepared in step (1) and a hydrogen bond donor in the molar ratio of 1:1 to 1:3 to obtain a eutectic solvent; (3) mixing the eutectic solvent prepared in step (2) and a metal salt capable of coordinating with an olefin to obtain an active eutectic solvent containing the metal salt; (4) using the active eutectic solvent prepared in step (3) as an absorbent to separate olefins / alkanes. The method has the advantages of good olefin / alkane separating performance, ease of preparation, low cost, and high solubility for silver salts and copper salts.

Description

technical field [0001] The invention belongs to the fields of chemical technology and gas separation and purification, and in particular relates to a method for separating olefins / alkanes by using a protonated ionic liquid-based deep eutectic solvent. Background technique [0002] Unsaturated light hydrocarbons (C 2 ~C 4 ) as an important raw material in the chemical industry. In the petrochemical industry, the main production processes of olefins are catalytic dehydrogenation of alkanes, catalytic cracking, and steam cracking. Mixed components of olefins and alkanes are often obtained in the production of olefins. Therefore, it is necessary to adopt an appropriate method to separate alkenes and alkanes. However, due to similar physicochemical properties, such as molecular size, boiling point, and solubility, the separation of alkenes / alkanes is difficult, especially for alkenes and alkanes with the same number of carbon atoms. In the large-scale separation of short-cha...

Claims

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Application Information

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IPC IPC(8): B01D53/14C07C7/11C07C9/06C07C11/04
CPCB01D53/1487B01D53/1493B01D2252/30B01D2257/7022C07C7/11C07C9/06C07C11/04
Inventor 孙永利杨华伟张吕鸿徐咪窦浩桢
Owner TIANJIN UNIV
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