Title:
METHOD FOR PRODUCING BLEACHED PULP
Document Type and Number:
WIPO Patent Application WO/2021/020251
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a novel method for producing bleached pulp which is excellent overall in various performance categories such as whiteness or fading. Said problem is solved by the following method for producing bleached pulp. That is, the method for producing bleached pulp includes: a digestion step for digesting a lignocellulosic substance; an alkaline oxygen bleaching step for bleaching unbleached pulp obtained in the cooking step by using alkaline oxygen; and a chlorine dioxide treatment step for treating the pulp obtained in the alkaline oxygen bleaching step by using chlorine dioxide in combination with a monosulfuric acid, wherein a treatment solution in the chlorine dioxide treatment step has a pH value of 2-8.
Inventors:
SHINKAI MAIKO (JP)
IKEDA HIDETOSHI (JP)
IKEDA HIDETOSHI (JP)
Application Number:
PCT/JP2020/028356
Publication Date:
February 04, 2021
Filing Date:
July 22, 2020
Export Citation:
Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
D21C9/14
Domestic Patent References:
| WO2009081714A1 | 2009-07-02 |
Foreign References:
| JP2010265564A | 2010-11-25 | |||
| JP2011001636A | 2011-01-06 | |||
| JP2004183149A | 2004-07-02 |
Attorney, Agent or Firm:
KOBAYASHI Hiroshi et al. (JP)
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