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Blend membrane comprising polyvinyl acetate and polyether-b-polyamide, preparation thereof and applications thereof

A polyvinyl acetate, blended membrane technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as low mechanical strength, and achieve low mechanical strength, easy to repeat, and mild operating conditions. Effect

Inactive Publication Date: 2014-07-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this point of view, PVAc can be used as a 2 membrane material, but its low mechanical strength cannot be used alone in the field of membrane preparation

Method used

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  • Blend membrane comprising polyvinyl acetate and polyether-b-polyamide, preparation thereof and applications thereof
  • Blend membrane comprising polyvinyl acetate and polyether-b-polyamide, preparation thereof and applications thereof
  • Blend membrane comprising polyvinyl acetate and polyether-b-polyamide, preparation thereof and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add 2.5 grams of vacuum-dried Pebax1074 (m(PEO):m(PA12)=55:45, mass ratio) to 95 grams of dimethylacetamide solvent, and stir at 80°C for 6 hours to form a uniform and transparent After the polymer solution, add 2.5 grams of PVAc to the polymer solution, continue stirring for 2 hours, and after forming a uniform and transparent solution again, carry out static defoaming, and pour the defoamed casting solution into a clean horizontal glass plate In the smooth iron ring on the top, the casting liquid is spread evenly on the glass plate, the temperature of the glass plate is kept at 50 ℃, the solvent is volatilized, and finally the primary film is formed. The primary film was carefully removed from the glass plate, placed in a vacuum oven, dried for 72 h, and the residual solvent was removed to obtain a PVAc / Pebax1074 (1 / 1) blend homogeneous film with a mass ratio of PVAc and Pebax1074 of 1:1. And test its penetration performance.

[0058] Table 1 Experimental results of ...

Embodiment 2

[0061] Add 3.5 grams of vacuum-dried Pebax1074 to 95 grams of dimethylacetamide solvent, stir at 80°C for 6 hours to form a uniform and transparent polymer solution, add 1.5 grams of PVAc to the polymer solution, continue stirring 2h, after forming a uniform and transparent solution again, carry out ultrasonic defoaming, pour the defoamed casting liquid into the smooth iron ring on a clean horizontal glass plate, so that the casting liquid spreads evenly on the glass plate, and the glass The plate temperature was kept at 50°C, solvent evaporation was carried out, and a nascent film was finally formed. The primary film was carefully removed from the glass plate, placed in a vacuum oven, dried for 72 h, and the residual solvent was removed to obtain a PVAc / Pebax1074 (3 / 7) blend homogeneous film with a mass ratio of PVAc and Pebax1074 of 3:7. And test its penetration performance.

[0062] Table 2 Experimental results of Example 2 (25°C, 5atm)

[0063]

Embodiment 3

[0065] Add 4.5 grams of vacuum-dried Pebax1074 to 95 grams of dimethylacetamide solvent, stir at 85°C for 6 hours to form a uniform and transparent polymer solution, add 0.5 grams of PVAc to the polymer solution, and continue stirring 2h, after forming a uniform and transparent solution again, carry out negative pressure defoaming; pour the defoamed casting liquid into the tetrafluoro board, so that the casting liquid spreads evenly on the tetrafluoro board, and the temperature of the glass plate is kept at 50 ℃, the solvent is evaporated, and finally a primary film is formed. The primary membrane was carefully removed from the glass plate, placed in a vacuum oven, dried for 72 hours, and the residual solvent was removed to obtain a PVAc / Pebax1074 (1 / 9) blend homogeneous membrane with a mass ratio of PVAc and Pebax1074 of 1:9. , and test its penetration performance.

[0066] Table 3 Experimental results of Example 3 (25°C, 5atm)

[0067]

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Abstract

The invention relates to a blend membrane comprising polyvinyl acetate and polyether-b-polyamide, preparation thereof and applications thereof. The polyvinyl acetate (PVAc) and polyether-b-polyamide (Pebax) are adopted as raw materials of the membrane, and a gas separation membrane is prepared by a solution blending method. The blend membrane has advantages of a glassy-state polymer membrane and a rubbery-state polymer membrane. Acid gases such as CO2, H2S and SO2 preferentially permeate the blend membrane. The blend membrane has high separation performances for CO2 / N2, SO2 / N2, H2S / CH4, CO2 / CH4, and other systems.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, in particular to a polyvinyl acetate and polyether-b-polyamide blend membrane and its preparation and application. Background technique [0002] With the development of global industrialization, CO 2 The emission of CO 2 The capture and storage (CCS) of China has received extensive attention from people from all walks of life. The CCS process includes CO from the gas source 2 capture, CO 2 transportation and CO 2 The energy consumption of capture accounts for about 2 / 3 of the total energy consumption of CCS, which is the bottleneck restricting the development of CCS. Therefore, the development of new high-efficiency CO 2 Capture technology is the key to the development of CCS. [0003] Currently, for CO 2 The traditional methods of gas separation mainly include physical absorption method, chemical absorption method, pressure swing adsorption method and cryogenic condensati...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D53/22
Inventor 任吉中冯世超李晖邓麦村
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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