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A polyvinylamine composite functional membrane with lamellar screening channels and its preparation method and application

A technology of polyvinylamine and compound functions, which is applied in the field of chemical engineering gas separation membranes, can solve the problems of poor diffusion performance of small molecule gas and reduce free volume, etc., and achieve the effects of improving CO2 permeability, preventing crystallization, and easy operation

Active Publication Date: 2019-12-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical interaction between a large number of amine groups in the amine-containing fixed carrier membrane will cause the crystallization of the polymer and reduce the free volume in the membrane, resulting in poor diffusion performance of small molecule gases in the membrane.

Method used

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  • A polyvinylamine composite functional membrane with lamellar screening channels and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: adopt the method of the present invention to prepare the polyvinylamine composite membrane with lamellar screening channel, the steps are as follows:

[0035] Step 1, prepare 1mg / mL graphene oxide dispersion liquid by Hummers method;

[0036] Step 2: Select 100 mL of the above-mentioned graphene oxide dispersion liquid and disperse it ultrasonically to form a uniform and stable aqueous solution. Subsequently, 15% polyvinylamine aqueous solution was added dropwise, and the mass ratio of graphene oxide and polyvinylamine was adjusted to 1:0.5, ultrasonically dispersed for 1 h, and stirred at room temperature for 6 h to obtain a uniform mixture, which was centrifuged and dried for further processing. with , named product A. The interlayer spacing of graphene oxide regulated by polyvinylamine intercalation in product A is 8.9 Å;

[0037]Step 3: Dissolve 0.5g of polyvinylamine and 0.00375g of product A in 9.5g of aqueous solution, and ultrasonically disperse ...

Embodiment 2

[0040] Embodiment 2: adopt the method of the present invention to prepare the polyvinylamine composite membrane with lamellar screening channel, the steps are as follows:

[0041] Step 1, prepare 2 mg / mL graphene oxide dispersion by Hummers method;

[0042] Step 2: Select 50 mL of the above-mentioned graphene oxide dispersion and disperse it ultrasonically to form a uniform and stable aqueous solution. Subsequently, 15% polyvinylamine aqueous solution was added dropwise, the mass ratio of graphene oxide and polyvinylamine was adjusted to be 1:1, ultrasonically dispersed for 3 h, and stirred at room temperature for 8 h to obtain a uniform mixture, which was centrifuged and dried for further processing. with , named product A. The interlayer spacing of graphene oxide regulated by polyvinylamine intercalation in product A is 11.2 Å;

[0043] Step 3: Dissolve 0.5g of polyvinylamine and 0.005g of product A in 9.5g of aqueous solution, and ultrasonically disperse until the solutio...

Embodiment 3

[0046] Embodiment 3: adopt the method of the present invention to prepare the polyvinylamine composite membrane with lamellar screening channel, the steps are as follows:

[0047] Step 1, prepare 2 mg / mL graphene oxide dispersion by Hummers method;

[0048] Step 2: Select 50 mL of the above-mentioned graphene oxide dispersion and disperse it ultrasonically to form a uniform and stable aqueous solution. Subsequently, 15% polyvinylamine aqueous solution was added dropwise, the mass ratio of graphene oxide and polyvinylamine was adjusted to be 1:2, ultrasonically dispersed for 6 h, and stirred at room temperature for 12 h to obtain a uniform mixed solution, which was centrifuged and dried for further processing. with , named product A. The interlayer spacing of graphene oxide regulated by polyvinylamine intercalation in product A is 15.4 Å;

[0049] Step 3: Dissolve 0.5g of polyvinylamine and 0.0075g of product A in 9.5g of aqueous solution, and ultrasonically disperse until th...

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Abstract

The invention discloses a polyvinylamine composite functional membrane with lamella sieving channels and a preparation method and application of the polyvinylamine composite functional membrane. The preparation method comprises the following steps: dissolving an intercalation copolymer of graphene oxide and polyvinylamine into a polyvinylamine solution, dispersing so as to obtain a uniform film casting solution, and preparing the functional membrane on the surface of a micro-pore filtering membrane by using a coating method, wherein t he adjusting range of the interlayer distance of the intercalation copolymer is 8.-24.. Polyvinylamine is dropped into graphene oxide dropwise and is effectively inserted into graphene oxide lamellae, and thus the lamella copolymer of the graphene oxide and the polyvinylamine is prepared; and by adjusting the ratio of graphene oxide to polyvinylamine, the interlayer distance of the graphene oxide lamellae can be regulated and controlled. When applied to CO2 separation, the composite functional membrane has relatively high CO2 permeation rate and separation factor. The preparation method disclosed by the invention is simple in process and easy to operate, and the CO2 permeation property of a polyvinylamine membrane and the CO2 selectivity of CO2 / CH4 and CO2 / N2 are effectively improved.

Description

technical field [0001] The invention relates to a polyvinylamine composite functional membrane with sheet-layer screening channels, a preparation method and application thereof, and belongs to the field of chemical engineering gas separation membranes. Background technique [0002] The immobilized carrier membrane containing amine groups is a new type of selective adsorption and separation of CO 2 The polymer membrane, due to the strong selective transport of CO 2 The ability, stable structure, and simple preparation have become one of the research hotspots. The separation principle is mainly to use the small molecule CO 2 A reversible complexation reaction with the amine-based carrier on the membrane surface forms an intermediate compound, CO 2 Jump from the current carrier to the next carrier that has not undergone complexation reaction and combine with it, migrate in the polymer membrane until reaching the downstream side of the membrane. CO 2 It has high selectivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/10B01D69/12B01D53/22C01B32/50
CPCB01D53/228B01D67/0079B01D69/10B01D69/12B01D2256/22C01B2210/0012Y02C20/20Y02C20/40Y02P20/151
Inventor 张新儒王永洪刘成岑王倩侯蒙杰张桃
Owner TAIYUAN UNIV OF TECH
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