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Título
Helium Recovery by Membrane Gas Separation Using Poly(o‑acyloxyamide)s
Autor
Año del Documento
2014
Editorial
Elsevier
Descripción
Producción Científica
Documento Fuente
Industrial and Engineering Chemistry Research , 2014, 53 (32), pp 12809–12818
Résumé
Poly(o-acyloxyamide)s (PORAs) derived from a poly(o-hydroxyamide) from 2,2′-bis(3-amino-4-hydroxyphenyl)-
hexafluoropropane (APAF) diamine, APAF−POHA, have been synthesized and evaluated as gas separation materials. PORAs
were synthesized from poly(o-hydroxyamide)s by derivatization of the free OH group with an aliphatic acid dichloride or
dianhydride that allowed the introduction of acetyl or pivaloyl groups on their structure. All of them showed low−medium
thermal stability due to a degradation of the amide moieties, and most of them (those synthesized from isophthaloyl dichloride
(IPC), 2,2′-bis(4-carboxyphenyl) hexafluoropropane dichloride (6FC), and 4,4′-dicarboxydiphenylsulfone dichloride (DPSC))
showed good mechanical properties. The poly(o-acyloxyamide)s synthesized have shown good permselectivities for He/N2 and
He/CH4 separations and very good permeability−selectivity balance for He/CO2 separation. The acetyl PORAs showed better
permeability versus selectivity balances than the pivaloyl ones. Moreover, selectivity increased while permeability decreased in the
sequence 6F-APAF > IP-APAF > DPS-APAF. Intersegmental distances, d-spacing, were shown to decrease along this sequence,
obtaining a nice correlation between permeability and d-spacing. For the He/N2 and the He/CH4 pairs of gases, the best
permeability−selectivity values are obtained for 6F-APAF-Ac with a He permeability of 33 barrer and selectivities of 84 and 106,
respectively. DPS-APAF-Ac gives a He permeability of 13 barrer and a selectivity of 21 for the He/CO2 separation.
Materias (normalizadas)
Helium Recovery
Membrane Gas Separation
ISSN
0014-3057
Revisión por pares
SI
Patrocinador
Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA302U13)
Version del Editor
Idioma
eng
Derechos
openAccess
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