Neutral monoperoxysulfate bleaching process

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact

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162 76, 162 78, 162 89, 162 90, D21C 914, D21C 9147, D21C 9153, D21C 916

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active

057700117

ABSTRACT:
An elementally chlorine-free method for the delignification and bleaching of pulp which involves the use of a neutral monoperoxysulfate bleaching step to delignify and thus brighten the pulp. The process achieves good selectivities above about 3 even at high delignification degrees of 60% or greater.

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Lachenal, "The Potential of H202 as delignifying amd bleaching agent", 1992 Pacific Pulps and Paper Conf. Proceedinfgs; Sep. 8-10 1992.
"Bleaching Groundwood and Kraft Pulps with Potassium Peroxymonosulfate--Comparison with Hydrogen Peroxide"--Edward L. Springer and James D. McSweeny Published: 1986 Publishing Conference--pp. 671-681--TAPPI Proceedings.
"Delignification of Aspen Wood Using Hydrogen Peroxide and Peroxymonosulfate" Edward L. Springer Published: 1989 Contaminant Problems and Strategies in Wastepaper Recycling, pp. 125-128--TAPPI Notes.
"Delignification of Wood Fibers with Peroxymonosulfate--A Potential New Pulping Process" James L. Minor and Edward L. Springer Publication: 1989 Wood and Pulping Chemistry, pp. 133-138--TAPPI Proceeding.
"Use of Calcium Sulfite and Air to Bleach a Delignified Aspen Kraft Pulp" Edward L. Springer and James D. McSweeny Publication: TAPPI, v. 69,4, pp. 129-130--1986.

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