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Mill Trial of the New Bleaching Agent -THPS

TitleMill Trial of the New Bleaching Agent -THPS
Publication TypeJournal Article
Year of Publication2009
AuthorsHu, TQ, Williams, T, Schmidt, JA, James, BR, Cavasin, R, Lewing, D
JournalPulp & Paper-Canada
Volume110
Pagination37-42
Date PublishedSep
Type of ArticleArticle
ISBN Number0316-4004
Keywordsbleach, bleaching, brightness, BRIGHTNESS STABILIZING AGENTS, CHEMISTRY, COMPOUNDS, COSTS, mechanical pulps, PHOSPHONIUM, SODIUM HYDROSULFITE, SULFATE, TERTIARY PHOSPHINES, TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM
Abstract

An eight-day mill. trial of adding tetrakis(hydroxymethyl)phosphonium sulfate (THPS) (at 1.0 kg THPS/t pulp) to hydrosulfite (Y) bleaching of spruce SGW pulp shows an average, additional brightness gain of 2.0-2.3 ISO points without any bleach plant or paper machine process upsets. This additional brightness gain, sustained during subsequent one-year commercial implementation of the "THPS + Y" bleaching technology, allows the mill to reach brightness target during the difficult summer period, and to reduce the consumption of expensive brightness-enhancing additives for LWC papers. Overall estimated cost saving to the mill is $250,000/year.

URL<Go to ISI>://000270960500008