Title:
METHOD FOR PRODUCING BLEACHED PULP
Document Type and Number:
WIPO Patent Application WO/2022/102206
Kind Code:
A1
Abstract:
The present invention provides a means for producing beached pulp that has an excellent degree of whiteness. A method for producing beached pulp, said method comprising: an alkaline oxygen bleaching step wherein unbleached pulp is subjected to alkaline oxygen bleaching; a permonosulfuric acid bleaching step wherein a treatment with permonosulfuric acid bleaching is performed; and a first chlorine dioxide bleaching step wherein a treatment with chlorine dioxide is performed. With respect to this method for producing beached pulp, the ratio of the addition rate (% by mass) of the chlorine dioxide relative to the absolute dry mass of the unbleached pulp to the addition rate (% by mass) of the permonosulfuric acid relative to the absolute dry mass of the unbleached pulp, namely (addition rate of chlorine dioxide)/(addition rate of permonosulfuric acid) is from 0.25 to 4.0.
Inventors:
NAKAHIRA TAISUKE (JP)
UERA KAZUYOSHI (JP)
SHINKAI MAIKO (JP)
UERA KAZUYOSHI (JP)
SHINKAI MAIKO (JP)
Application Number:
PCT/JP2021/031196
Publication Date:
May 19, 2022
Filing Date:
August 25, 2021
Export Citation:
Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
D21C9/10; D21C9/14; D21C9/153; D21C9/16
Domestic Patent References:
| WO2009081714A1 | 2009-07-02 |
Foreign References:
| JP2011001637A | 2011-01-06 | |||
| JP2008088606A | 2008-04-17 | |||
| JP2007308824A | 2007-11-29 | |||
| JP2012219416A | 2012-11-12 |
Attorney, Agent or Firm:
KOBAYASHI Hiroshi et al. (JP)
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