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Preparation of polyvinylamine/polyaniline mixed matrix membranes used for separation of gas containing carbon dioxide

A technology of mixed matrix membrane and polyvinylamine, applied in separation methods, chemical instruments and methods, semi-permeable membrane separation, etc., can solve the problem of low performance of composite membranes, and achieve the effect of good stability and high CO2 permeation selectivity

Inactive Publication Date: 2015-07-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous studies, polyaniline nanofibers were used to prepare polyvinylamine / polyaniline composite membranes, but the performance of the obtained composite membranes was not high because the nanofibers were easily entangled to form agglomerates.

Method used

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  • Preparation of polyvinylamine/polyaniline mixed matrix membranes used for separation of gas containing carbon dioxide
  • Preparation of polyvinylamine/polyaniline mixed matrix membranes used for separation of gas containing carbon dioxide
  • Preparation of polyvinylamine/polyaniline mixed matrix membranes used for separation of gas containing carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, an aqueous hydrochloric acid solution with a pH of 1 was prepared, and cetylammonium bromide and aniline were added to obtain solution A. Then, solution B was prepared by dissolving ammonium persulfate in water. Two solutions were mixed, wherein the concentration of cetyl ammonium bromide was 0.3 mol / L, and the concentrations of aniline and ammonium persulfate were both 0.05 mol / L. The mixed solution was left at 5°C for 36 hours. The samples were centrifuged and washed to obtain polyaniline nanosheets, such as figure 1 shown.

[0022] Polyvinylamine, polyaniline nanosheets and water are mixed, and ultrasonically stirred at room temperature to obtain a coating liquid. Among them, the mass fraction of polyvinylamine is 2%, and the mass ratio of polyvinylamine to polyaniline nanosheets is 9:1. The coating liquid prepared above was coated on a polysulfone base film with a wet coating thickness of 300 μm, and then placed in an environment with a temperature of 30°...

Embodiment 2

[0025] First, an aqueous sulfuric acid solution with a pH of 1.5 was prepared, and solution A was obtained by adding cetylammonium bromide and aniline. Then, solution B was prepared by dissolving ammonium persulfate in water. Two solutions were mixed, wherein the concentration of cetyl ammonium bromide was 0.1 mol / L, the concentration of aniline was 0.2 mol / L, and the concentration of ammonium persulfate was 0.05 mol / L. The mixed solution was left at -10°C for 24 hours. The samples were centrifuged and washed to obtain polyaniline nanosheets.

[0026] A coating liquid is prepared by mixing polyvinylamine, polyaniline nanosheets and water. Among them, the mass fraction of polyvinylamine is 4%, and the mass ratio of polyvinylamine to polyaniline nanosheets is 20:1. The coating liquid prepared above was coated on a polysulfone base film with a wet coating thickness of 50 μm, and then placed in an environment with a temperature of 20° C. and a relative humidity of 30% to dry fo...

Embodiment 3

[0029] First, an aqueous hydrochloric acid solution with a pH of 2 was prepared, and solution A was obtained by adding cetylammonium bromide and aniline. Then, solution B was prepared by dissolving ammonium persulfate in water. Two solutions were mixed, wherein the concentration of cetyl ammonium bromide was 1.0 mol / L, and the concentrations of aniline and ammonium persulfate were both 0.5 mol / L. The mixed solution was left at -10°C for 10 hours. The samples were centrifuged and washed to obtain polyaniline nanosheets.

[0030] A coating liquid is prepared by mixing polyvinylamine, polyaniline nanosheets and water. Among them, the mass fraction of polyvinylamine is 1%, and the mass ratio of polyvinylamine to polyaniline nanosheets is 10:1. The coating liquid prepared above was coated on a polyethersulfone base film with a wet coating thickness of 200 μm, and then placed in an environment with a temperature of 40° C. and a relative humidity of 40% to dry for 20 hours to obta...

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Abstract

The invention provides a preparation of polyvinylamine / polyaniline mixed matrix membranes used for separation of gas containing carbon dioxide. According to the preparation method, polyaniline nanosheets or nanotubes are prepared; polysulfone or polyether sulfone ultrafilter membranes are taken as base membranes; the base membranes are coated with a coating liquid prepared via mixing of the polyaniline nano material with polyvinylamine and water; and the separation membranes are obtained via drying at a certain temperature under certain relative humidity. Advantages are that: the mixed matrix gas separation membranes prepared from polyaniline nanosheets or nanotubes and polyvinylamine possesses high CO2 penetration selectivity and excellent stability, and is suitable for separation of gas containing CO2. When the mixed matrix gas separation membranes are used for separation of a CO2 / N2 mixed gas (CO2 volume fraction ranges from 10 to 20%), CO2 permeation rate ranges from (300 to 3100)*10<-6>cm<3>(STP)*cm<-2>*s<-1>*cmHg<-1>, and CO2 / N2 separation factor ranges from 80 to 300.

Description

technical field [0001] The present invention relates to a method for containing CO 2 The invention relates to a preparation method of a polyvinylamine / polyaniline mixed matrix membrane for gas separation, belonging to the technical field of gas separation membranes. Background technique [0002] Fixed carrier membrane is a new type of CO 2 Separation membranes that can simultaneously have high CO 2 permeability and selectivity. Polyvinylamine can be combined with CO due to its content 2 The primary amine group that undergoes reversible reaction is a commonly used immobilized carrier membrane material. The PVAm / PSf or PVAm / PES composite membrane prepared with polyvinylamine (PVAm) as the separation layer and polysulfone (PSf) or polyethersulfone (PES) membrane as the support layer has better CO 2 However, in order to realize the large-scale application of gas separation membranes, it is still necessary to further improve its permeation selectivity. [0003] In recent ye...

Claims

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Application Information

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IPC IPC(8): B01D71/60B01D69/02B01D67/00B01D53/22
CPCY02C20/40
Inventor 王志赵颂赵娟乔志华王纪孝
Owner TIANJIN UNIV
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