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Document Type and Number:
Japanese Patent JPS5153004
Kind Code:
A
Abstract:
Bleaching of a lignocellulose-contg. matl. by the gas phase chlorination of a 20-40% (pref. 30%) pulp combined with displacement bleaching with ClO2 as an oxidation agent, is improved in that the spent liquor from the ClO2-stage is used as a displacing agent to dilute an unbleached or preliminarily O2-bleached pulp, the pulp is concentrated before the gas phase chlorination to a solids content >=30% (pref. >=40%), and the gas phase chlorination is carried ut at an elevated temp. pref. for less than 2 mins. Spent solns. from the ClO2-stage is utilised, whereby the total consumption of water is considerably reduced and the heat economy is improved.

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Inventors:
IYOORAN ERITSUKU ANARUGUREN
Application Number:
JP10648175A
Publication Date:
May 11, 1976
Filing Date:
September 01, 1975
Export Citation:
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Assignee:
SUNDS AB
International Classes:
D21C9/10; D21C9/14; D21C9/12; (IPC1-7): D21C9/08; D21C9/12



 
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