Title:
【発明の名称】溶解固形分の濃度プロフィールを制御する方法
Document Type and Number:
Japanese Patent JP3126386
Kind Code:
B2
Abstract:
Digester systems for producing paper pulp form comminuted cellulosic fibrous material take into account the level of dissolved organic materials (DOM), such as lignin, hemi-cellulose maintaining the DOM level at about 100 g/l throughout the cook (particulary kraft cook). In order to make sure there is sufficient liquid to slurry the material in the feed system of a two vessel, som liquid is withdrawn from the circulation conduits between the digester and impregnation vessel, cooled, and fed to the feed system. In a vapor phase digester, the level of liquid at the top of the digester is more precisely controlled by circulating some of the withdrawn liquid from a circulatory loop of the digester to the level tank associated with the feed system. An in-line drainer may be provided in the feed system between a make-up liquor pump a liquid inlet conduit leading to the top of an impregnation vessel. Within the digester, a set of extraction/dilution screens is provided specifically positioned and spaced from each other, and with respect to a reintroduction conduit opening, so that mixing of different DOM concentration liquids is minimized.
Inventors:
Marcocchia, Bruno S
Bluff, The Ray Robert
Raxo, Richard O
Chasse, Earl Fred
Bluff, The Ray Robert
Raxo, Richard O
Chasse, Earl Fred
Application Number:
JP51379195A
Publication Date:
January 22, 2001
Filing Date:
July 20, 1994
Export Citation:
Assignee:
Andritz-Ahlstrom Incorporated
International Classes:
C08B15/00; D21C3/02; C08B1/00; D21C3/22; D21C3/24; D21C7/00; D21C7/12; D21C7/14; D21C9/02; D21C11/00; D21C11/02; D21C11/04; D21G7/00; (IPC1-7): D21C7/12; D21C7/14
Domestic Patent References:
| JP4300378A | ||||
| JP5140402A | ||||
| JP61152892A | ||||
| JP3130482A |
Attorney, Agent or Firm:
Shizuo Nakamura (2 outside)