A kind of glycine functional ionic liquid and its preparation method and application

A glycine, ionic liquid technology, applied in separation methods, chemical instruments and methods, educts, etc., can solve problems such as slow absorption rate, achieve high-efficiency absorption capacity, improve stability, and facilitate industrialization.

Active Publication Date: 2015-09-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional ionic liquids absorb CO 2 It belongs to physical absorption, and the absorption rate is slow

Method used

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  • A kind of glycine functional ionic liquid and its preparation method and application
  • A kind of glycine functional ionic liquid and its preparation method and application
  • A kind of glycine functional ionic liquid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: the synthesis of aminoacetic acid functional ionic liquid

[0043] The first step is the synthesis of 1-hydroxyethyl-3-methylimidazole chloride.

[0044] The specific reaction formula of the first step is as follows:

[0045]

[0046] Put the 250mL round-bottomed three-necked flask into an oil bath, install a condensation reflux device, and feed the raw materials N-methylimidazole (0.4mol) and 2-chloroethanol (0.6mol) into the three-necked flask according to the molar ratio of 1:1.5 Add in, turn on the magnetic stirring, raise the temperature to 80°C, and react for 24 hours; after the reaction, use a rotary evaporator to distill under reduced pressure to remove unreacted raw materials in the ionic liquid, and cool and crystallize at room temperature at 25°C; wash the crystals with ethyl acetate for 3 Filtration after the second time; put the ionic liquid containing a trace amount of solvent into a vacuum drying oven, set the temperature at 70°C and dry...

Embodiment 2

[0051] Embodiment 2: Glycine functional ionic liquid is used as absorbent

[0052] 0.1mol[C 2 OHmim][Gly] was dissolved in deionized water, and the volume was fixed to a 250mL volumetric flask with deionized water, and stirred evenly to obtain an absorption solution containing glycine functional ionic liquid. The obtained absorption solution containing glycine functional ionic liquid was placed in a constant temperature water tank at 30° C. for 10 minutes, so that the temperature of absorption liquid containing glycine acid functional ionic liquid reached the set temperature of 30° C., stirred and mixed, and set aside.

Embodiment 3

[0057] Embodiment 3: Glycine functional ionic liquid is to CO 2 The absorption effect

[0058] The absorbing solution containing aminoacetic acid functional ionic liquid prepared in embodiment 2 and the absorbing solution containing chlorinated 1-hydroxyethyl-3-methylimidazole prepared in comparative example 1 are tested respectively according to the following methods for absorbing capacity of carbon dioxide:

[0059] The absorption process is carried out in double stirred tanks, normal pressure (101KPa), temperature 30°C, CO 2 The flow rate is 50mL / min, the total gas flow rate is 0.5L / min, the volume of the absorption liquid is 250mL, and the concentration of the absorbent is 0.4mol / L. The gas phase stirring speed of the double stirred tank is controlled to 250rpm, and the liquid phase stirring speed is 100rpm. Gas import and export CO 2 The concentration was detected by gas chromatography. When the inlet and outlet concentrations are basically the same, the absorption sat...

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Abstract

The invention discloses aminoacetic acid functional ionic liquid which has the molecular composition of 1-hydroxyethyl-3-methyl imidazolinium giycinate with a molecular formula of [C2OHmim][Gly], and the structural formula is shown in formula I, wherein Gly- is NH2CH2COO-. The invention also discloses a method for preparing the aminoacetic acid functional ionic liquid. The preparation is simple and easy to operate and implement. The aminoacetic acid functional ionic liquid can serve as an absorbent and can be used for trapping or separating carbon dioxide in gas, and the absorbent has high-efficiency CO2 absorption capacity, simultaneously has high oxidization resistance and high stability, is easily regenerated, can effectively overcome the defect that the traditional organic amine and conventional ionic liquid cannot absorb CO2 and has the advantages of economical efficiency and simplicity in industrialization. (img file='DDA0000452193640000011.TIF' wi='712' he='328' / ).

Description

technical field [0001] The invention relates to the field of absorbents for capturing and separating carbon dioxide, in particular to a glycine functional ionic liquid, a preparation method thereof and an application in capturing or separating carbon dioxide. Background technique [0002] As we all know, the global warming caused by the greenhouse effect has been intensified in recent decades, causing a series of environmental problems, such as melting glaciers, rising sea levels, drought, etc., which seriously threaten the survival and development of life on earth. while CO 2 As one of the most important greenhouse gases, its control and emission reduction has attracted attention from all walks of life. Between 1970 and 2004, global CO 2 emissions increased by 70%. According to the IPCC Emission Scenario Special Report, if fossil fuels maintain their dominant position in the global mix of energy structures by 2030 and beyond, global greenhouse gas emissions will increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/60B01D53/14C01B31/20C01B32/50
CPCY02C10/06B01D53/14C01B32/50C07D233/60Y02C20/40Y02P20/151
Inventor 李伟吕碧洪夏银峰李素静
Owner ZHEJIANG UNIV
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