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Studies on applications of natural polyphenol–phenol–formaldehyde copolymer based cation exchange resins
Author(s) -
Mitra N. C.,
Banerjee R. S.,
Sarkar A.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070550305
Subject(s) - catalysis , copolymer , hydrolysis , phenol , chemistry , ion exchange resin , formaldehyde , polyphenol , styrene , phase inversion , polymer chemistry , organic chemistry , chemical engineering , materials science , polymer , engineering , antioxidant , biochemistry , membrane
Naturally occurring polyphenol(condensed tannin)‐phenol‐formaldehyde copolymer matrix based cation exchange resins have been successfully used as a solid catalyst (in H + ion form) in the inversion of sucrose and hydrolysis of methyl acetate. Apart from the normal advantages of the solid catalyst over the acid catalysts in the solution phase, the values of the activation energy, entropy, and enthalpy of activation of the reactions involved reveal that the resins prepared acted as a catalyst with characteristics comparable to those of the commercially available resins based on a styrene–DVB matrix. The resins have also been successfully used for softening of hard water and enrichment of metal ion concentration from very dilute solutions. © 1995 John Wiley & Sons, Inc.