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Low-viscosity I-type porous liquid as well as preparation method and use method thereof

A low-viscosity, liquid technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of high viscosity and limit large-scale practical applications, and achieve low viscosity, good solution operability advantages, and good long-term The effect of stability

Pending Publication Date: 2022-01-11
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It faces the following three challenges in the preparation process: ① It has a cavity or pore structure inside; ② The rigid structure is not easy to collapse; ③ No intermolecular self-filling
[0004] Although some progress has been made in the research of type I porous liquids, they all exhibit high viscosity, such as "liquid-like" or "gel-like" characteristics, which greatly limits their large-scale application in the gas capture industry. practical application

Method used

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  • Low-viscosity I-type porous liquid as well as preparation method and use method thereof
  • Low-viscosity I-type porous liquid as well as preparation method and use method thereof
  • Low-viscosity I-type porous liquid as well as preparation method and use method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0037] The preparation of the amino-functionalized porous body is mainly by coating or grafting the amino polymer on the surface of the porous body by impregnation method or in-situ covalent grafting or post-synthesis modification strategy. The preferred amino polymer is branched polyethyleneimine (BPEI) with a molecular weight of 400 to 4000 g·mol -1 .

[0038] The synthesis steps are as follows:

[0039]Step 1: Weigh a certain amount of amino-functionalized porous bodies such as one or more of inherently porous MOFs, ZIFs, COFs or POCs and dissolve them in acetone solvent to form component A;

[0040] Step 2: Weigh a certain amount of single-terminated epoxy PDMS and dissolve it in acetone solvent to form component B;

[0041] Step 3: Mix component A and component B at 30-70°C, stir magnetically for 12-24 hours, and centrifuge to obtain component C of the mixture;

[0042] Step 4: Put component C in a dialysis bag in acetone for dialysis for 48-72 hours, replace the aceto...

Embodiment 1

[0046] (1) Weigh ZIF-8 (0.2g) solid and dissolve it in methanol (20mL), and ultrasonicate for 5 minutes to form solution A; Weigh branched polyethylene BPEI (M n ~600g·mol -1 ) (0.2g) were dissolved in methanol (20mL), and ultrasonicated for 5 minutes to form solution B; at 25°C, solution A and solution B were mixed, magnetically stirred for 24 hours, centrifuged at 6000rpm for 6 minutes, and washed with methanol three times, Dry at 70°C to obtain ZIF-8@BPEI white powder for future use. The ZIF-8@BPEI has an average pore size of 0.72nm and a specific surface area of ​​1071m 2 g -1 .

[0047] (2) Weigh ZIF-8@BPEI (0.2g) and dissolve it in acetone (40mL), sonicate for 5 minutes to form solution C; Weigh single-terminal epoxy PDMS (M n ~1000g·mol -1 ) (4g) was dissolved in an acetone solvent, ultrasonicated for 5 minutes to form solution D; solution D was added to solution C at 55°C, magnetically stirred for 12 hours, centrifuged at 8000rpm for 8 minutes, and washed 3 times ...

Embodiment 2

[0051] (1) Weigh Zn(NO 3 ) 2 ·6H 2 O (2g), 2-methylimidazole (12g) and hyperbranched polyolefin BPEI (M n ~600g·mol -1 ) (0.6g) were dissolved in 30mL of methanol to form solutions A, B, and C; at 25°C, the mixture of solutions A, B, and C was magnetically stirred for 24 hours, centrifuged, washed with methanol three times, and dried at 70°C. Obtained ZIF-8-g-BPEI white powder. The ZIF-8-g-BPEI has an average pore diameter of 0.89nm and a specific surface area of ​​1980m 2 g -1 .

[0052] (2) Weigh ZIF-8-g-BPEI (0.2g) and dissolve it in acetone (40mL), and ultrasonically form solution D for 5 minutes; Weigh single-terminal epoxy PDMS (M n ~1000g·mol -1 ) (4g) was dissolved in acetone solvent, ultrasonicated for 5 minutes to form solution E; solution E was added to solution D at 55°C, magnetically stirred for 12 hours, centrifuged at 8000rpm for 8 minutes, and washed 3 times with acetone to obtain a crude product.

[0053] (3) Dialyze the crude product in acetone solve...

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Abstract

The invention relates to a low-viscosity I-type porous liquid, a preparation method and a use method thereof. The low-viscosity I-type porous liquid has the characteristics of permanent gaps of a porous solid adsorbent and rapid mass transfer and efficient heat transfer of liquid. The low-viscosity I-type porous liquid is mainly constructed on the basis of an amino-functionalized metal-organic framework compound (MOFs), a zeolite-like imidazate framework porous material (ZIFs), a covalent organic framework (COFs) or a porous organic cage (POCs) and single-ended epoxy terminated polydimethylsiloxane PDMS through a covalent cross-linking strategy. The low-viscosity I-type porous liquid combines the permanent void characteristic of a porous main body and the excellent fluidity characteristic of a liquid adsorbent. The I-type porous liquid is low in viscosity, wide in liquid range, high in thermal stability, good in circularity and efficient in CO2 adsorption and CO2 / N2 separation. The preparation method of the low-viscosity I-type porous liquid is universal, and the process is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of porous materials and preparation, and relates to a low-viscosity I-type porous liquid, a preparation method and a use method, and the low-viscosity I-type porous liquid can efficiently CO2 under low pressure. 2 Capture and CO 2 / N 2 Separate applications. Background technique [0002] With the rapid development of the economy, human demand for fossil energy continues to grow, resulting in CO 2 The large-scale emissions have produced a serious greenhouse effect, which has aroused great concern worldwide. Among them, carbon capture technology is regarded as one of the effective technical means to achieve this goal, and is also regarded as one of the most promising solutions. [0003] At present, commonly used gas adsorption materials are divided into two categories: solid state and liquid state. Among them, solid state adsorbents are severely limited in large-scale continuous pumping systems, and liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08L87/00C08J3/24B01D53/02
CPCC08J3/246B01D53/02C08J2383/06C08J2487/00B01D2257/504B01D2256/10Y02C20/40Y02P20/50Y02P20/151
Inventor 郑亚萍李晓倩姚东东党精甲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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