BLEACHING OF KRAFT PULP WITH HYDROSULFITE

A method of strengthening oxidatively bleached kraft pulps (including recycled pulps) is taught wherein the pulp is treated with hydrosulfite, formamidine sulfinic acid or a selected sulfoxylate at specified pH, temperature and retention times. Further strengthening is obtained by the addition of a...

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Bibliographische Detailangaben
Hauptverfasser:	SHEPPERD, PAUL W., III, HAMILTON, GLYNN A, DUCHARME, NORMAN R., II
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPARATUS THEREFOR CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TEXTILES
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Beschreibung
Zusammenfassung:	A method of strengthening oxidatively bleached kraft pulps (including recycled pulps) is taught wherein the pulp is treated with hydrosulfite, formamidine sulfinic acid or a selected sulfoxylate at specified pH, temperature and retention times. Further strengthening is obtained by the addition of a selected quaternary ammonium compound or alkoxylated amine.