RT info:eu-repo/semantics/article
T1 Helium Recovery by Membrane Gas Separation Using Poly(o‑acyloxyamide)s
A1 Díez, Blanca
A1 Cuadrado Curto, Purificación
A1 Marcos Fernández, Ángel
A1 Prádanos del Pico, Pedro Lourdes
A1 Tena Matias, Alberto
A1 Palacio Martínez, Laura
A1 Lozano, Ángel E.
A1 Hernández Giménez, Antonio
K1 Helium Recovery
K1 Membrane Gas Separation
AB 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. PORAswere synthesized from poly(o-hydroxyamide)s by derivatization of the free OH group with an aliphatic acid dichloride ordianhydride that allowed the introduction of acetyl or pivaloyl groups on their structure. All of them showed low−mediumthermal 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 andHe/CH4 separations and very good permeability−selectivity balance for He/CO2 separation. The acetyl PORAs showed betterpermeability versus selectivity balances than the pivaloyl ones. Moreover, selectivity increased while permeability decreased in thesequence 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 bestpermeability−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.
PB Elsevier
SN 0014-3057
YR 2014
FD 2014
LK http://uvadoc.uva.es/handle/10324/21902
UL http://uvadoc.uva.es/handle/10324/21902
LA eng
NO Industrial and Engineering Chemistry Research , 2014, 53 (32), pp 12809–12818
NO Producción Científica
DS UVaDOC
RD 22-dic-2024