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International Journal of Chemical Reactor Engineering

Ed. by de Lasa, Hugo / Xu, Charles Chunbao

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Chemical Cross-Linking of 6FDA-6FPA Polyimides for Gas Permeation Membranes

Maribel López-Badillo
  • Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Ciudad Universitaria, C.P. 72570 Puebla, Puebla, México
  • Benemérita Universidad Autónoma de Puebla, Facultad de Ingeniería Química, Avenida San Claudio y 18 Sur, Ciudad Universitaria, C.P. 72570 Puebla, Mexico
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/ José Alberto Galicia-Aguilar
  • Corresponding author
  • Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Ciudad Universitaria, C.P. 72570 Puebla, Puebla, México
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/ Esiquio Ortiz-Muñoz
  • Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Ciudad Universitaria, C.P. 72570 Puebla, Puebla, México
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/ Gabriel Hernández-Rodríguez
  • Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Ciudad Universitaria, C.P. 72570 Puebla, Puebla, México
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/ Fernando Humberto Del Valle-Soto
  • Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Ciudad Universitaria, C.P. 72570 Puebla, Puebla, México
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Published Online: 2018-05-08 | DOI: https://doi.org/10.1515/ijcre-2017-0252

Abstract

In this work, 4,4ʹ-hexafluoroisopropiliden anhydride diftalic (6FDA) and 4,4ʹ-hexafluoropropiliden bis(p-phenilenoxi) dianiline (6FPA) polyimides were synthesized by two step polycondensation. The polyimides were utilized in the dense membrane formation by casting solution method. The membranes were cross–linked by immersion in a 1,5-pentadiamine in methanol solution prepared at different concentrations. The fraction of insoluble mass indicates the cross-linking degree, which varies from 0 to 1. In the other hand, the fractional free volume (FFV) calculated from Bondi theory decreases as the cross-linking degree increases in the membrane. The membranes were tested in the permeation of pure H2, CO2, N2 and CH4 gases. The results exhibited that permeability of the cross-linked membranes increases compared to the uncross-linked membrane. In the other hand, gas permselectivity data where located in the Robeson´s diagram being near to upper limit for the H2/CO2 pair of gases. The membranes are good candidates to carry out the low molecular weight’s gas separation.

Keywords: 6FDA; gas permeation; cross-link; membrane; selectivity

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About the article

Received: 2017-12-23

Accepted: 2018-04-16

Revised: 2018-03-28

Published Online: 2018-05-08


Citation Information: International Journal of Chemical Reactor Engineering, 20170252, ISSN (Online) 1542-6580, DOI: https://doi.org/10.1515/ijcre-2017-0252.

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