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Preparation method of CO2 gas absorbent for polyamine ionic liquid

A technology of gas absorbent and ionic liquid, which is applied in the field of absorbing CO2 gas absorbent, can solve the problems of high product cost and complex synthesis process, and achieve the effects of low production cost, simple synthesis method and strong absorption capacity

Inactive Publication Date: 2013-01-30
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patent documents all involve the use of functionalized ionic liquids to absorb CO 2 gas, but these ionic liquids have disadvantages such as complex synthesis process and high product cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Drop 0.5 mol lactic acid into 0.5 mol ethylenediamine, stir in an ice-water bath for 5 hours, stand still at room temperature for 3 hours, wash 3 times with ethyl acetate, place in a vacuum drying oven and vacuum dry for 24 hours to obtain ethylenediamine lactate Ionic liquid, ethylenediamine lactate ionic liquid and water molar ratio 1:0.5 are configured into the CO of polyamine ionic liquid 2 gas absorbent.

[0015] Absorb CO 2 Gas method:

[0016] The CO of the polyamine ionic liquid 2 The gas absorbent is placed in the absorber, and CO is introduced into the absorber at room temperature and normal pressure. 2 Gas, the tail gas outlet of the absorber is fed with sodium hydroxide solution to absorb CO 2 exhaust. After equilibrium, the ionic liquid and the absorbed CO 2 The molar ratio is 1:0.45.

Embodiment 2

[0018] Drop 0.5 mol of boric acid into 0.5 mol of diethylenetriamine, stir in an ice-water bath for 3 hours, stand still at room temperature for 4 hours, wash 4 times with ethyl acetate, and dry in vacuum for 24 hours to obtain diethylenetriamine borate ionic liquid. Diethylenetriamine borate ionic liquid and water molar ratio of 1:1.2 configured as polyamine ionic liquid CO 2 gas absorbent.

[0019] Absorb CO 2 Gas method:

[0020] The CO of the polyamine ionic liquid 2 The gas absorbent is placed in the absorber, and CO is introduced into the absorber at room temperature and normal pressure. 2 Gas, the tail gas outlet of the absorber is fed with sodium hydroxide solution to absorb CO 2 exhaust. After equilibrium, the ionic liquid and the absorbed CO 2 The molar ratio is 1:1.23.

Embodiment 3

[0022] 0.5mol formic acid was dropped into 0.5mol triethylenetetramine, stirred in an ice-water bath for 6h, stood still at room temperature for 3h, washed 3 times with ethyl acetate, and vacuum-dried for 24h to obtain triethylenetetramine lactate ionic liquid. Triethylenetetraamine lactate ionic liquid and water molar ratio of 1:2 to configure the CO of polyamine ionic liquid 2 gas absorbent.

[0023] Absorb CO 2 Gas method:

[0024] The CO of the polyamine ionic liquid 2 The gas absorbent is placed in the absorber, and CO is introduced into the absorber at room temperature and normal pressure. 2 Gas, the tail gas outlet of the absorber is fed with sodium hydroxide solution to absorb CO 2 exhaust. After equilibrium, the ionic liquid and the absorbed CO 2 The molar ratio is 1:1.75.

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PUM

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Abstract

The invention discloses a preparation method of a CO2 gas absorbent for a polyamine ionic liquid, wherein the CO2 gas absorbent can be simply prepared with low cost. The method comprises dropwise adding inorganic or organic acid into polyamine organics in accordance with a mole ratio of 1 : 1 of the polyamine organics and the inorganic or organic acid, stirring to react for 2 to 8 hours in an ice-water bath, allowing to stand for 3 to 5 hours at room temperature to form an amine-based ionic liquid, washing the amine-based ionic liquid for 3 to 5 times with ethyl acetate, drying under vacuum for 24 hours in a vacuum drying box, and mixing the obtained ionic liquid and water in a mole ratio of 1 : 0.2 to 2 to prepare the CO2 gas absorbent. The CO2 gas absorbent provided by the invention is strong in absorption capability, wherein the mole ratio of the absorbed CO2 amount and the ionic liquid is up to 1 : 2.29; has regeneration performance, wherein the ionic liquid desorption rate of the saturatedly absorbed ionic liquid absorbent is up to 99 %; and simple in synthetic method and low in production cost.

Description

technical field [0001] The present invention relates to the absorption of CO 2 Gas absorbent, especially a polyamine ionic liquid CO 2 Gas absorbent preparation method. Background technique [0002] CO 2 is one of the major greenhouse gases in the atmosphere, composed of CO 2 The resulting greenhouse effect and global warming are attracting people's attention. while CO 2 It is a safe and non-toxic carbon resource, CO 2 Emission reduction and resource utilization have become one of the most important research topics in the 21st century. Traditional chemical absorbents have CO in the process of absorption and circulation 2 The absorption efficiency is not high, the absorbent has a large loss due to volatilization, the regeneration energy consumption is high, and the equipment is corroded. Therefore, studying the diversity of green CO 2 Absorbents are very necessary. [0003] Room Temperature Ionic Liquids (RTILs) are composed of organic cations and inorganic or organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCY02C10/06Y02A50/20Y02C20/40
Inventor 张崇民陈书文孙志敏
Owner UNIV OF SCI & TECH LIAONING
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