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Attapulgite-polyether-b-polyamide mixed matrix membrane as well as preparation and application thereof

A technology of mixed matrix membrane and attapulgite, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of high gas permeability and separation selectivity, easy to produce defects, and high price, and achieve Significant industrial application prospects, improved separation selectivity, and improved permeability

Active Publication Date: 2015-11-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for traditional polymer membranes to meet high gas permeability and separation selectivity at the same time, that is, it is difficult to break through the upper limit of the Robeson curve.
Although dense inorganic membranes can obtain high permeation flux and high selectivity at the same time, inorganic materials are brittle, prone to defects, and expensive, which limits their wide industrial applications.

Method used

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  • Attapulgite-polyether-b-polyamide mixed matrix membrane as well as preparation and application thereof
  • Attapulgite-polyether-b-polyamide mixed matrix membrane as well as preparation and application thereof
  • Attapulgite-polyether-b-polyamide mixed matrix membrane as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 8 grams of PEBAX-1657 particles into 92 grams of ethanol / water (volume ratio 70 / 30) solution, and stir at 80°C for 2 hours under reflux to dissolve completely. Then, 0.4 g of attapulgite was added to the above polymer solution, and the casting solution was obtained by ultrasonication for 60 min. Then stand still for 12 hours for degassing, apply the casting solution on the polytetrafluoroethylene board by scraping, and control the air humidity to 20%; then put it in a vacuum drying oven, and vacuumize for 12 hours at a room temperature of 20°C , then the temperature was raised to 50°C for 48 hours, and then the temperature was raised to 80°C for 48 hours to further remove the residual solvent, and finally the attapulgite / polyether-b-polyamide mixed matrix film was obtained after peeling off the polytetrafluoroethylene plate , the thickness of the film is 60 μm. It has been determined that under the conditions of 30°C and 0.4MPa, CO 2 , N 2 、CH 4 The permeability...

Embodiment 2

[0037] Add 8 grams of PEBAX-1657 particles into 92 grams of ethanol / water (volume ratio 70 / 30) solution, and stir at 80°C for 2 hours under reflux to dissolve completely. Then add 0.04, 0.16, 0.4, 0.8 grams of attapulgite into four identical polymer solutions, ultrasonicate for 30 minutes, and then stand for 12 hours to defoam to prepare the casting solution. Apply the four parts of casting solution on four polytetrafluoroethylene boards by scraping, and control the air humidity to 5%; then put it into a vacuum drying oven, vacuumize at 20°C for 12h, and then raise the temperature Dry at 50°C for 48 hours, continue to heat up to 80°C and dry for 48 hours, further remove residual solvent, and finally peel off from the polytetrafluoroethylene plate to obtain a polyether-b-polyamide film with a thickness of 60 μm. Under the conditions of 30°C and 0.4MPa, the CO of the membrane was tested by a gas permeation device 2 , N 2 、CH 4 Permeability, membrane performance data are shown...

Embodiment 3

[0046] Add 8 grams of PEBAX-1657 particles into 92 grams of organic solvents (n-butanol, acetic acid and ethanol, respectively), and stir at 80°C for 2 hours under reflux to dissolve completely. Then, 0.4 g of attapulgite was added to the above polymer solution, and the casting solution was obtained by ultrasonication for 60 min. Then stand still for 12 hours for degassing, apply the casting solution on the polytetrafluoroethylene board by scraping, and control the air humidity to 5%; then put it in a vacuum drying oven, vacuumize for 48 hours at 15°C, Then the temperature was raised to 50°C for 12 hours, and then the temperature was raised to 80°C for 48 hours to further remove the residual solvent. Finally, the attapulgite / polyether-b-polyamide mixed matrix film was obtained after peeling off the polytetrafluoroethylene plate. The thickness of the film was 30 μm. It has been determined that, under the conditions of 60°C and 0.4MPa, the CO of the membrane is tested by a gas ...

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Abstract

The invention discloses an attapulgite-polyether-b-polyamide mixed matrix membrane as well as preparation and application thereof. The attapulgite-polyether-b-polyamide mixed matrix membrane is characterized in that a segmented copolymer, namely polyether-b-polyamide (PEBAX), serves as a matrix membrane material; attapulgite serves as a filler and accounts for 0.5-10% of polyether-b-polyamide in mass percent. The attapulgite-polyether-b-polyamide mixed matrix membrane is prepared by uniformly dispersing attapulgite in a matrix membrane solution through ultrasonic dispersion, and then carrying out knife coating. The attapulgite-polyether-b-polyamide mixed matrix membrane has a remarkable property of separating CO2 / N2 and CO2 / CH4 mixed gases (PCO2 is larger than 120 Barrer; alpha CO2 / N2 is larger than 50; alpha CO2 / CH4 is larger than 20). Compared with a pure polyether-b-polyamide membrane, the attapulgite-polyether-b-polyamide mixed matrix membrane is higher in CO2 gas permeability and separation selectivity, and can be applied to purification of flue gas and natural gas.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, in particular to an attapulgite and polyether-b-polyamide mixed matrix membrane and its preparation and application. Background technique [0002] With the increasing consumption of fossil fuel resources, CO 2 The content in the atmosphere is increasing day by day, the greenhouse effect and the resulting environmental problems are becoming more and more serious. CO 2 The separation and capture of has been widely concerned by people from all walks of life. Compared with the traditional liquid solvent absorption method, cryogenic distillation method, molecular sieve adsorption method, etc., the membrane separation method has the characteristics of no phase change, low energy consumption, simple equipment, and convenient operation. Ideal gas separation membrane materials must have high permeability, high selectivity, and good chemical and thermal stability. However, it is difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00B01D53/22
CPCY02C20/40
Inventor 潘宜昌向龙王重庆
Owner NANJING UNIV OF TECH
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