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A new class of bleaching and brightness stabilizing agents. Part IV: Probing the bleaching chemistry of THP and BBHPE

TitleA new class of bleaching and brightness stabilizing agents. Part IV: Probing the bleaching chemistry of THP and BBHPE
Publication TypeJournal Article
Year of Publication2007
AuthorsChandra, R, Hu, TQ, James, BR, Ezhova, MB, Moiseev, DV
JournalJournal of Pulp and Paper Science
Volume33
Pagination15-22
Date PublishedJan-Mar
ISBN Number0826-6220
Abstract

To study the bleaching chemistry of recently discovered phosphorus-based bleaching and brightness stabilizing agents, we reacted lignin model chromophores, milled wood lignin (MWL) and pulps with tris(hydroxymethyl)phosphine (THP), 1,2-bis[bis(hydroxymethyl)phosphino]ethane (BBHPE) and sodium hydrosulphite (Y). Ultraviolet-visible spectroscopy and mass spectrometry studies showed that nucleophilic addition was the major reaction between the phosphines and the model chromophores 2-methoxy-p-benzoquinone and coniferaldehyde. THP and BBHPE were equally reactive toward the model chromophores and the o- and p-quinones introduced to a spruce thermomechanical pulp via oxidation of the pulp with Fremy’s salt. BBHPE had a higher reactivity than THP or Y toward the etherified coniferaldehyde structures in spruce MWL.

URL<Go to ISI>://000246589100003