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Title:
DIGESTION METHOD FOR PULP
Document Type and Number:
WIPO Patent Application WO/2000/077295
Kind Code:
A1
Abstract:
A digestion method for producing pulp which comprises digesting a lignocellulose material by using an alkaline digesting liquor containing polysulfides in the presence of a quinone-hydroquinone compound having a value obtained by reducing an oxidation-reduction potential observed in a form being present during digestion to a standard oxidation-reduction potential (Ea), wherein an activity of hydrogen ion is 1, in the range of 0.12 to 0.25 V to the standard hydrogen electrode potential. The method can be used for digesting a lignocellulose material to a pulp having a low kappa value in high yield, and also for reducing the amount of chemicals to be used and for reducing a load on a boiler for recovery.

Inventors:
ANDOH TATSUYA (JP)
TANAKA JUNJI (JP)
WATANABE KEIGO (JP)
NANRI YASUNORI (JP)
NAKAO MAKOTO (JP)
Application Number:
PCT/JP2000/003835
Publication Date:
December 21, 2000
Filing Date:
June 13, 2000
Export Citation:
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Assignee:
KAWASAKI KASEI CHEMICALS (JP)
JUJO PAPER CO LTD (JP)
ASAHI GLASS CO LTD (JP)
ANDOH TATSUYA (JP)
TANAKA JUNJI (JP)
WATANABE KEIGO (JP)
NANRI YASUNORI (JP)
NAKAO MAKOTO (JP)
International Classes:
D21C3/02; D21C3/22; (IPC1-7): D21C3/00
Domestic Patent References:
WO1997041295A11997-11-06
Foreign References:
JPS5729690A1982-02-17
JPH08218290A1996-08-27
JPH11100783A1999-04-13
Other References:
See also references of EP 1245721A1
Attorney, Agent or Firm:
Senmyo, Kenji (Kanda-Higashimatsushitacho Chiyoda-ku Tokyo, JP)
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