Title:
【発明の名称】セルロースパルプ製造の際に添加剤でセルロース材を処理する方法および装置
Document Type and Number:
Japanese Patent JP2002506133
Kind Code:
A
Abstract:
Chemical cellulose pulp (e.g. kraft pulp) is produced with enhanced strength and/or yield using a strength or yield enhancing additive such as polysulfide or anthraquinone or its equivalents or derivatives, and in a manner that allows effective recovery/reuse of the additive so as to make the process more economical. In a continuous digester a low temperature and relatively low alkalinity protecting zone is provided at the top of the digester terminating with a first screen, and a second screen is provided below the first screen. Between the first and second screens, prior to bulk delignification, a first counter-current zone is provided, and additive-containing liquid from the first screen is recirculated to the slurry at or near the digester inlet to enhance yield or strength.
Inventors:
Bruno S. Marcosia
Application Number:
JP2000534717A
Publication Date:
February 26, 2002
Filing Date:
February 25, 1999
Export Citation:
Assignee:
Andritz-Ahlstrom Incorporated
International Classes:
D21C1/00; D21C3/02; D21C3/22; D21C3/24; D21C7/00; (IPC1-7): D21C1/00; D21C7/00
Attorney, Agent or Firm:
Nakamura Shizuo