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Method using ionic liquid for gas drying and dehydration

An ionic liquid and gas drying technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of high regeneration energy consumption, complex systems, and easy contamination, and achieve corrosion avoidance, simple equipment, and good quality. The effect of the dehydrating effect

Active Publication Date: 2015-08-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solvent absorption method usually uses triethylene glycol (TEG) as the absorbent, but the system is complex and the regeneration energy consumption is large; TEG is easy to be lost, polluted, and oxidized to generate corrosive organic acids

Method used

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  • Method using ionic liquid for gas drying and dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Such as figure 1 The absorption process shown. The operating conditions of the absorption tower are temperature 25℃, pressure 2.5MPa, absorption tower has 10 theoretical trays, and the feed gas is CO containing 0.2% (mole fraction) of water. 2 Gas, fed from the bottom of the tower, with a mass flow rate of 3890kg / h, with ionic liquid [EMIM] + [Tf 2 N] - (1-Ethyl-3-methylimidazole bistrifluoromethanesulfonimide) is added from the top of the tower as an absorbent, the mass flow is 2000kg / h, and CO is obtained from the top of the tower 2 The water content in the product is 19.3ppm, and the bottom of the tower is rich in [EMIM] + [Tf 2 N] - The raffinate phase enters the gas-liquid separator, and the gas-liquid separator is operated at room temperature and pressure to remove [EMIM] + [Tf 2 N] - Small amount of CO in 2 The gas and the remaining liquid of the kettle flow into the flash tank to remove [EMIM] + [Tf 2 N] - The water in the flash tank is operated at a temperature of...

Embodiment 2

[0024] Such as figure 1 The absorption process shown. The operating conditions of the absorption tower are temperature 25℃, pressure 2.5MPa, absorption tower has 10 theoretical trays, and the feed gas is CO containing 0.2% (mole fraction) of water. 2 Gas, fed from the bottom of the tower, with a mass flow rate of 3890kg / h, with ionic liquid [EMIM] + [Tf 2 N] - To add the absorbent from the top of the tower, the mass flow rate is 2500kg / h, and CO is obtained from the top of the tower 2 The water content in the product is 18.8ppm, and the bottom of the tower is rich in [EMIM] + [Tf 2 N] - The raffinate phase enters the gas-liquid separator, and the gas-liquid separator is operated at room temperature and pressure to remove [EMIM] + [Tf 2 N] - Small amount of CO in 2 The gas and the remaining liquid of the kettle flow into the flash tank to remove [EMIM] + [Tf 2 N] - The water in the flash tank is operated at a temperature of 140°C and a pressure of 0.05 atm. The bottom of the flash...

Embodiment 3

[0031] Such as figure 1 The absorption process shown. The operating conditions of the absorption tower are temperature 25℃, pressure 2.5MPa, absorption tower has 10 theoretical trays, and the feed gas is CO containing 0.2% (mole fraction) water 2 Gas, fed from the bottom of the tower, with a mass flow rate of 3890kg / h, with ionic liquid [EMIM] + [Tf 2 N] - To add the absorbent from the top of the tower, the mass flow rate is 2500kg / h, the top of the tower gets CO 2 The water content in the product is 16.2ppm, and the bottom of the tower is rich in [EMIM] + [Tf 2 N] - The raffinate phase enters the gas-liquid separator, and the gas-liquid separator is operated at room temperature and pressure to remove [EMIM] + [Tf 2 N] - A small amount of gas in the reactor, the residual liquid of the kettle flows into the flash tank to remove [EMIM] + [Tf 2 N] - The water in the flash tank is operated at a temperature of 145°C and a pressure of 0.05 atm. The bottom of the flash tank is extracted...

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Abstract

A method using ionic liquid for gas drying and dehydration belongs to the technical field of gas drying (or absorption). The ionic liquid is used as an absorbent, an absorption tower runs at the temperature of 0-100 DEG C under the pressure of 0.1-10MPa, and the theoretical tower plate number is 8-17. Water content in a feed gas (mole fraction) is 0.01%-5%, the solvent ratio is 0.1-13, water content (mole fraction) in a gas product obtained at the tower top is less than 20ppm; compared with the prior art, when the ionic liquid and an ionic liquid mixed solvent is used for absorption of water in the gas, dehydration effect is good, the ionic liquid is neutral, and can avoid compressor corrosion, and avoid the high energy consumption and environmental pollution problems caused by use of a traditional solvent for absorption of the gas, and the method is simple in equipment, less in investment, and low in energy consumption.

Description

Technical field [0001] The invention relates to an ionic liquid solvent using an absorption method to remove moisture (including condensable organic matter) in a gas mixture. The absorbent can be a single ionic liquid or a mixed solution of two ionic liquids, etc., belonging to the technical field of gas drying (or absorption). Background technique [0002] Gas dehydration in industry mainly includes carbon dioxide dehydration, natural gas dehydration, and synthesis gas dehydration. For example, to prevent the formation of hydrates and prevent CO 2 Corrosion to pipelines and equipment after being dissolved in water, the main body needs to be CO before transportation 2 The mixed gas is dehydrated; it contains CO 2 And H 2 S natural gas forms acid in the presence of water and corrodes pipelines and equipment. Under certain conditions, it forms natural gas hydrates and blocks valves, pipelines and equipment, reducing pipeline transportation capacity and causing unnecessary power con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/26
Inventor 雷志刚韩敬莉代成娜陈标华
Owner BEIJING UNIV OF CHEM TECH
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