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Title:
METHOD AND APPARATUS FOR PRODUCING PULP BLEACHING WATER
Document Type and Number:
Japanese Patent JP2010144263
Kind Code:
A
Abstract:

To improve COP, to simplify facilities and to stably supply pulp bleaching water that has a temperature set to the temperature fluctuation of raw water.

In a method for producing pulp bleaching water used in a bleaching step of bleaching pulp produced from a pulp raw material t in a pulp production step, the raw water w in the vicinity of a normal temperature is fed to the upper part of a thermal stratification tank 20, cold water is introduced to the lower part of the thermal stratification tank, a thermal stratification is formed in the vertical direction in the inside of the thermal stratification tank, the raw water w guided from the upper part of the thermal stratification tank is cooled by a freezer 30 constituting a freezing cycle into cold water c, the cold water is fed to the lower part of the thermal stratification tank, temporarily stored, the cold water c guided from the lower part of the thermal stratification tank is fed to an absorption column 40, a bleaching agent is absorbed in the cold water in the absorption column to produce bleaching water.

COPYRIGHT: (C)2010,JPO&INPIT


Inventors:
HIRAGA YOICHI
TSUBATA KOICHI
ICHIMURA KENZO
Application Number:
JP2008320277A
Publication Date:
July 01, 2010
Filing Date:
December 16, 2008
Export Citation:
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Assignee:
MAEKAWA SEISAKUSHO KK
International Classes:
D21C9/10; D21C9/14
Domestic Patent References:
JPS55142787A1980-11-07
JPH04245991A1992-09-02
JPH07258206A1995-10-09
JP3029857U1996-10-11
JPS60239304A1985-11-28
JPH11118373A1999-04-30
JPH06147665A1994-05-27
JPH0123040A
Attorney, Agent or Firm:
特許業務法人 高橋松本&パートナーズ