Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With washing
Patent
1995-01-17
1997-06-24
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With washing
162 72, 162 90, D21C 902
Patent
active
056413858
ABSTRACT:
Ethyleneamines are used in washing pulp to remove lignin. A process for washing a cellulose pulp mixture containing lignin to remove at least a portion of the lignin therefrom comprises use of a washing composition with at least about 100 ppm of an ethyleneamine. The process includes an improvement in a washing process a cellulose pulp mixture containing lignin wherein a washing composition is used to remove at least a portion of the lignin, the improvement comprising use of at least about 100 ppm of an ethyleneamine with the washing composition and/or using an amount of ethyleneamine at least equivalent to about 100 ppm based on the washing composition with the washing composition. The washing composition is also novel and includes a washing composition for washing kraft pulp comprising water and at least about 100 ppm of an ethyleneamine.
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Croft Alan P.
Sheffield Byford D.
Czaja Donald E.
Nguyen Dean T.
The Dow Chemical Company
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