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Ethanol:water blends separation using ultrafiltration membranes of poly(acrylamide‐co‐acrylic acid) partial sodium salt and polyacrylamide
Author(s) -
EspinozaGomez Heriberto,
SaucedoCastillo Eduardo,
FloresLópez Lucía Z.,
RogelHernandez Eduardo,
Martínez Manuel,
Wakida Fernando T.
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23010
Subject(s) - membrane , ethanol , ultrafiltration (renal) , acrylamide , polyacrylamide , chemistry , acrylic acid , selectivity , chromatography , nuclear chemistry , sodium , polymer chemistry , organic chemistry , polymer , biochemistry , catalysis , monomer
Abstract In this work, poly(acrylamide‐co‐acrylic acid) partial sodium salt (P(AAM‐co‐AA)Na), and polyacrylamide (PAAM) membranes were synthesized for separation of ethanol:water blends. The membrane characteristics were evaluated to determine their ability to separate mixtures of ethanol:water and get dehydrate ethanol (95 %). Synthesized membranes showed higher selectivity to ethanol compared to existing polymeric membranes. The ethanol:water blends had an ethanol concentration of 0.10 to 0.70 L/L. The results showed that a mixture of ethanol:water (75:25 L/L) can be concentrated up to 95 % ethanol. The membranes’ stability were studied in absolute ethanol and ethanol:water blend (30:70 L/L) for a period of 30 days of permanent exposure. The membrane deterioration is due to the chemical modification of the membrane active surface layer. It was found that the membranes have a high selectivity (350 times higher) compared to existing membranes, and the substantial and flow of water was 12.15 kg · m −2 · h −1 .