PRODUCTION OF HIGHLY WHITE WASTE PAPER PULP

PROBLEM TO BE SOLVED: To provide a method for producing highly white waste paper pulp by further bleaching deinked pulp obtained from printed waste paper, especially waste news paper, capable of reducing a drainage load in the bleaching process and further capable of being added to new pulp at a hig...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	NOGUCHI OSAMU, YATOMI TOSHIHARU, UCHIMOTO IWAHIRO
Format:	Patent
Sprache:	eng
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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for producing highly white waste paper pulp by further bleaching deinked pulp obtained from printed waste paper, especially waste news paper, capable of reducing a drainage load in the bleaching process and further capable of being added to new pulp at a high rate corresponding to the increase in the use of the reclaimed paper. SOLUTION: This method for producing highly white waste paper pulp comprises deinking printed waste paper and further bleaching the obtained deinked waste paper pulp. Therein, the waste paper pulp is dehydrated, mixed and soaked in hydrogen peroxide as an oxidation type bleaching agent in a pulp concentration of >=25% at the ordinary temperature to an enhanced temperature, and further bleached with formamidine sulphinic acid as a reduction type bleaching agent in a pulp concentration of 8-20% at a temperature of 50-100 deg.C for 10-90 min.