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US 2005/0028952 A1Published application
Apparatus for making carboxylated pulp fibers
AssigneeWeyerhaeuser Company
InventorsDavid Severeid, Richard Jewell, Joseph Komen, S. Weerawarna, Bing Su
Life of this patent
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Abstract
An apparatus for carboxylating wood pulp which utilizes the wood pulp bleach plant and the method of carboxylating the pulp which takes place in the bleach plant.
Claims21
A pulp carboxylation system comprising
- a pulp bleaching stage,
- a washer following said pulp bleaching stage,
- a first mixer following said washer,
- a supply of basic material connected to said system whereby said base material will be mixed by said first mixer,
- a second mixer following said first mixer,
- a supply of carboxylation chemicals connected to said system after said first mixer whereby said carboxylation chemicals will be mixed by said second mixer,
- a first stage reaction chamber following said second mixer,
- a third mixer following said reaction chamber,
- a supply of stabilizing material connected to said system after said reaction chamber whereby said stabilizing material will be mixed by said third mixer,
- a second stage stabilizing chamber following said second mixer.
7 more elements
9 The carboxylation system of claim 1 in which said pulp bleaching stage is a chlorine dioxide stage.
The carboxylation system of claim 9 in which said stabilizing chamber is a chlorine dioxide tower.
Dependencies are inferred from the claim text.