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Stuart T Terrett, 9638331 Bluebird Ln, Selbyville, DE 19975

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38331 Bluebird Ln, Selbyville, DE 19975   

15 Seaford Pl, Okatie, SC 29909   

Bluffton, SC   

3536 Country Hill Dr, Fairfax, VA 22030   

Beaufort, SC   

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Us Patents

Process For High Consistency Delignification Using A Low Consistency Alkali Pretreatment

US Patent:
5525195, Jun 11, 1996
Filed:
Sep 7, 1993
Appl. No.:
8/117341
Inventors:
William H. Friend - Savannah GA
Stuart T. Terrett - Elgin SC
Spencer W. Eachus - Allentown NJ
Bruce F. Griggs - Columbia SC
Assignee:
Union Camp Patent Holding, Inc. - Wayne NJ
International Classification:
D21C 912
D21C 9147
US Classification:
162 40
Abstract:
Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably between 25 to 35 percent by weight, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The use of a wash press reduces the overall amounts of alkaline material utilized in the process compared to processes which add alkaline material to the pulp at low consistency. Additional alkali may be applied, if desired, onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0. 8 and 7 percent by weight of oven dry pulp. High strength, low lignin pulps are formed after oxygen delignification which may be further bleached to high brightness with reduced amounts of bleaching chemicals.

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