Phosphonates as additives in kraft pulping

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Abstract

The performance of phosphonates as additives for modified Kraft pulping was investigated. The use of 0.1-0.2% phosphonates in kraft cooking resulted in considerable reduction in kappa number (4-8 points), while pulp yield was increased substantially. The bleaching responses of phosphonate modified pulps to DEDED and OPD sequences were significantly improved, allowing lower chemical application or higher final brightness. In addition to enhanced lignin removal, the improved bleachability is likely extended by an appreciable decrease in metal content of pulp fibers.

Original languageEnglish (US)
Pages (from-to)111-141
Number of pages31
JournalPulping Conference, Proceedings of the Technical Association of the Pulp and Paper Industry
StatePublished - Dec 1 2001
EventProceedings of the 2001 TAPPI Pulping Conference - Seattle, WA, United States
Duration: Nov 4 2001Nov 7 2001

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