Avoidance of salt scaling by acidic pulp washing process
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 17, 1998
Grant Date -
N/A
app pub date -
Oct 25, 1995
filing date -
Oct 25, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The use of hot water extraction (pH 7-8, 165.degree. F.) in place of an alkaline extraction in pulp bleaching sequences between an ozone delignification stage alkaline wash and a brightening stage allows higher strength pulp to be achieved at essentially the same brightness levels using reduced overall amounts of bleaching chemicals. In addition, effluents from pulp washing stages following these treatments can be recycled without generating scale in process equipment because the solubility of salts that could form such scale is significantly greater in these effluents.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully