BLEACHING OF PULP AND APPARATUS THEREFOR

PURPOSE:To provide a process and apparatus for bleaching lignincontaining pulp and effective for improving the delignification efficiency in the step of pouring and mixing an alkaline chemical and oxygen gas into a pulp slurry. CONSTITUTION:A pulp slurry is maintained under a pressure higher than th...

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Bibliographic Details
Main Author TADA TOMONORI
Format Patent
LanguageEnglish
Published 09.07.1993
Subjects
APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
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Summary:PURPOSE:To provide a process and apparatus for bleaching lignincontaining pulp and effective for improving the delignification efficiency in the step of pouring and mixing an alkaline chemical and oxygen gas into a pulp slurry. CONSTITUTION:A pulp slurry is maintained under a pressure higher than the bottom pressure of an alkali extraction column by <=1kg/cm for >=20sec in the stage from the pouring and mixing of an alkaline chemical and oxygen gas to the pulp slurry to the supply of the pulp slurry to an alkali extraction column 2.
Bibliography:Application Number: JP19910342823