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Preparation method of sulfonated graphene oxide/polymer mixed matrix membrane used for gas separation

A mixed-matrix membrane and graphene technology, which is applied in separation methods, carbon compounds, chemical instruments and methods, etc., can solve the problems that the performance of mixed-matrix membranes cannot be optimized, the film formation process is difficult, and the long-term instability is achieved. Excellent performance, good stability, good dispersion effect

Pending Publication Date: 2021-08-31
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems that the above-mentioned graphene oxide-based two-dimensional materials are easy to coagulate and settle in the organic matrix, thermal and long-term instability, the performance of the mixed matrix film cannot be optimized, and the film formation process is difficult. The present invention proposes a Method for grafting modified graphene oxide with sulfonic acid groups with higher enthalpy

Method used

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  • Preparation method of sulfonated graphene oxide/polymer mixed matrix membrane used for gas separation
  • Preparation method of sulfonated graphene oxide/polymer mixed matrix membrane used for gas separation
  • Preparation method of sulfonated graphene oxide/polymer mixed matrix membrane used for gas separation

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1 Preparation of sulfonated reduced graphene oxide / polyimide mixed matrix membrane

[0033] Take 0.005g of the prepared sulfonated reduced graphene oxide and 2mL N,N-dimethylacetamide to prepare a filler suspension, and dissolve 1g of polyimide polymer in 8mL of an organic solvent to prepare an organic casting solution. Blend the suspension with the casting solution to form a mixed matrix membrane casting solution, use the drop coating method to heat the film at 60°C, and peel off at 80°C (2h), 120°C (2h), 150°C (18h) . The stripped membrane material was placed in a gas permeation instrument, and the gas separation performance was tested at 35°C and 3 bar. Among them, the carbon dioxide permeation flux was 69.74 barrer, the carbon dioxide / methane separation coefficient was 81, and the carbon dioxide / nitrogen separation coefficient was 40.5; test its gas separation performance at 75°C and 3bar to test its high-temperature gas separation performance, in which the...

Embodiment 2

[0034] Example 2 Preparation of sulfonated reduced graphene oxide / polyimide mixed matrix membrane

[0035] Take 0.01g of the prepared sulfonated reduced graphene oxide and 2mL N,N-dimethylacetamide to form a filler suspension, and dissolve 1g of polyimide polymer in 8mL of an organic solvent to form an organic casting solution. Blend the suspension with the casting solution to form a mixed matrix membrane casting solution, use the drop coating method to heat the film at 60°C, and peel off at 80°C (2h), 120°C (2h), 150°C (18h) . Test its gas separation performance, in which the permeation flux of carbon dioxide is 103.3 barrer, the separation coefficient of carbon dioxide / methane is 45.4, and the separation coefficient of carbon dioxide / nitrogen is 19.9; the performance of high-temperature gas separation is tested, in which the permeation flux of carbon dioxide is 120.3 barrer, the separation coefficient of carbon dioxide / nitrogen is 120.3 barrer, The methane separation factor...

Embodiment 3

[0043] Example 3 Preparation of sulfonated reduced graphene oxide / cellulose acetate mixed matrix membrane

[0044] Take 0.005 g of the prepared sulfonated reduced graphene oxide and 2 mL of acetone to prepare a filler suspension, dissolve 1 g of cellulose acetate polymer in 8 mL of an organic solvent to prepare an organic film casting liquid, and mix the suspension with the film casting liquid Blend to form a mixed matrix membrane casting solution, use the drop coating method to heat the film at 60°C, and peel off at 80°C (2h), 120°C (2h), and 150°C (18h).

[0045] Gas separation performance test:

[0046] The stripped membrane material was placed in a gas permeation instrument, and the gas separation performance was tested at 35°C and 3 bar. Among them, the carbon dioxide permeation flux was 12.28 barrer, and the carbon dioxide / methane separation coefficient was 47.

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Abstract

The invention discloses a preparation method of a sulfonated graphene oxide / polymer mixed matrix membrane used for gas separation. The method comprises the following steps: dispersing dried sulfonated reduced graphene oxide in an organic solvent to form an inorganic filler dispersion liquid, and fully dissolving a polymer matrix membrane material in the organic solvent to obtain an organic membrane casting liquid; blending the inorganic filler dispersion liquid and the organic membrane casting liquid, carrying out ultrasonic defoaming treatment to obtain a sulfonated reduced graphene oxide / polymer mixed liquid as a membrane casting liquid, dispensing the sulfonated reduced graphene oxide / polymer mixed liquid on the surface of ultra-flat glass, and carrying out heating to volatilize a solvent so as to form a membrane; and carrying out high-temperature quenching treatment on a stripped mixed matrix membrane material. The mixed matrix membrane prepared by using the method can be applied to systems for carbon dioxide / methane separation, carbon dioxide / nitrogen separation, oxygen / nitrogen separation and the like, and has excellent separation performance and long-period stability; and the preparation method is easy to operate and suitable for large-scale application.

Description

technical field [0001] The invention relates to a method for preparing a polymer gas separation membrane doped with inorganic particles, in particular to a method for preparing a sulfonation-reduced graphite oxide / polymer mixed matrix membrane by using a physical blending method. Background technique [0002] The temperature rise caused by the excessive concentration of carbon dioxide on a global scale has become the focus of widespread attention in recent years. The emission reduction, separation, enrichment and reuse of carbon dioxide have become the main methods to effectively avoid resource waste and alleviate the greenhouse effect. Conventional carbon dioxide separation methods include cryogenic distillation, alcohol amine absorption, membrane separation process, etc. Membrane separation technology has become the most potential gas separation technology because of its small footprint, no phase change in the operation process, low separation energy consumption and envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/14B01D71/64C01B32/194B01D53/22
CPCB01D67/0079B01D69/148B01D71/64B01D53/228C01B32/194Y02P20/151Y02C20/40
Inventor 陈赞权凯栋于海斌罗超段翠佳袁标严硕
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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