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Hydrophobic Modified Polyethyleneimine Carbon Dioxide Absorbent and Its Application

A technology of polyethylenimine and absorbent, applied in the direction of reagents, chemical instruments and methods, separation methods, etc., can solve problems such as difficult diffusion and reduced CO2 absorption efficiency, and achieve the effect of improving efficiency

Active Publication Date: 2020-09-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further research found that there is a strong intermolecular force between the molecules of this material, so that CO 2 It is difficult to diffuse into the interior of the material, resulting in the absorption of CO on the surface of the material 2 Later, the internal amine group and CO 2 The reaction is very slow, so that CO 2 The absorption efficiency is greatly reduced

Method used

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  • Hydrophobic Modified Polyethyleneimine Carbon Dioxide Absorbent and Its Application
  • Hydrophobic Modified Polyethyleneimine Carbon Dioxide Absorbent and Its Application
  • Hydrophobic Modified Polyethyleneimine Carbon Dioxide Absorbent and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1－20

[0071] This group is an example of generating hydrophobically modified polyethyleneimine through the ring-opening reaction of the epoxy group of polyether glycidyl ether and the amine group in polyethyleneimine. The structure of polyether glycidyl ether is:

[0072]

[0073] (The parameters such as m and n are shown in Table 1). The linking group between the hydrophobic side chain and the main chain of the hydrophobically modified polyethyleneimine obtained by this group is Q1:

[0074] It should be pointed out that the mole fraction of PEI in Table 1 refers to the mole fraction of its repeating unit, that is, the mole fraction of nitrogen in PEI. The repeating units m of the polyether glycidyl ethers used may have fractional average values ​​due to the molecular weight distribution of the polymers.

[0075] Table 1

[0076]

[0077]

[0078]

[0079]The above-mentioned hydrophobically modified polyethyleneimine is prepared by the following method: polyethylen...

Embodiment 21－30

[0082] This group of embodiments first synthesizes polyether hydrophobic chain halogenated hydrocarbons, and its structural formula is (see Table 2 for parameters such as m and n) It should be pointed out that the repeating unit of the structural formula here is a repeating unit of polypropylene glycol (PPG), which can also be replaced by a repeating unit of polyoxetane (PTG) or polytetrahydrofuran ether (PTMG). The type of polyether side chain See Table 2.

[0083] Secondly, the polyether hydrophobic chain halogenated hydrocarbon and the amine group of branched polyethyleneimine (molecular weight 25000) are alkylated to obtain hydrophobically modified polyethyleneimine, and the connecting group between the main chain and the side chain For Q2: (corresponding to iodohydrocarbon, embodiment 21-25) or Q3: (corresponding brominated hydrocarbon, embodiment 26-30).

[0084] Table 2

[0085]

[0086] The specific synthesis process is as follows: For Examples 21-25, take 1 ...

Embodiment 31－40

[0090] This group of embodiments first synthesizes glycidyl ether of silane (m=0) or siloxane (m is greater than or equal to 1), and its structural formula is (see Table 3 for parameters such as m):

[0091] (abbreviated as PTMS, see Table 3);

[0092] Secondly, carry out alkylation reaction with the synthesized silane or siloxane glycidyl ether and the amine group of polyethyleneimine to obtain hydrophobically modified polyethyleneimine, and the connecting group between the main chain and the side chain is T :

[0093] table 3

[0094]

[0095] For each group of embodiments, the corresponding PTMS (see Table 3) is first synthesized, and the synthetic raw materials are trimethylsilane (m=0) or siloxane (m≠0) and allyl glycidyl ether terminated by silicon hydrogen , the molar parts of the two are respectively 1 molar part and 1.05 molar parts, and the two raw materials are dissolved in anhydrous isopropanol, so that the mass content of the raw materials is 30%, blowing...

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Abstract

The invention provides hydrophobic chain-grafted polyethyleneimine as a CO2 absorbent. The absorbent is used for absorbing CO2 in air at room temperature or absorbing CO2 in combustion emission from afactory at higher temperature, so as to reduce CO2 emission and prevent or alleviate global warming. The content of hydrophobic chain is 3 percent to 70 percent; the hydrophobic chain contains at least one repetitive unit of polypropylene oxide, polyoxetane or polytetrahydrofuran, or contains silane or siloxane, or contains alkyl or fluorine-containing alkyl with the carbon number of 1 to 22. Thehydrophobic chain is thermodynamically incompatible with polyethyleneimine, can generate a microphase separation structure, and a hydrophobic microcell provides an extra CO2 rapid diffusion channel,so that polyethyleneimine chain units in a material body can quickly take part in CO2 absorption. Compared with non-modified polyethyleneimine, the CO2 absorption rate of the hydrophobic chain-graftedpolyethyleneimine is greatly increased.

Description

technical field [0001] The present invention belongs to carbon dioxide (CO 2 ) capture field, specifically related to a hydrophobic chain modified polyethylenimine material that reversibly absorbs carbon dioxide and captures CO 2 aspects of application. Background technique [0002] At present, fossil fuels (coal, oil and natural gas, etc.) are still the main source of human energy. Annual CO2 from burning fossil fuels 2 has reached 30 billion tons, of which the CO emitted by thermal power plants 2 Accounted for 30%. It has been reported that atmospheric CO 2 The content has risen from 280ppm in 1955 to 400ppm in 2015. CO 2 is a greenhouse gas, CO in the atmosphere 2 Rising concentrations contribute more than 25% to global warming. The "Paris Agreement" stipulates that the increase in global average temperature should be controlled within 2°C above the pre-industrial level, and strive to control the increase within 1.5°C. To this end, countries around the world are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/62B01D53/81C08G81/00
CPCB01D53/62B01D53/81B01D2257/504C08G81/00Y02P20/151
Inventor 谢兴益龙远铸
Owner SICHUAN UNIV
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