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US 4,617,099 AGranted
Electrochemical bleaching of wood pulps
AssigneeThe Mead Corporation
InventorsGerhart Schwab, Mei-Tsu Lee, James W. Bentley
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Abstract
A process for electrochemically bleaching pulp which comprises dispersing a pulp in a solution of sodium chloride to provide a first pulp slurry; subjecting said pulp slurry to electrolysis at a pH in the range of about 0 to 2.0; filtering said pulp slurry to remove said pulp; dispersing said pulp in a second solution of sodium chloride to provide a second pulp slurry; subjecting said second pulp slurry to electrolysis at a pH greater than 8.0; and recovering said pulp.
Claims18
A process for electrochemically bleaching pulp which comprises:
- dispersing a pulp in a solution of sodium chloride to provide a first pulp slurry;
- subjecting said pulp slurry to electrolysis at a pH in the range of about 0 to 2.0;
- filtering said pulp slurry to remove said pulp;
- dispersing said pulp in a second solution of sodium chloride to provide a second pulp slurry;
- subjecting said second pulp slurry to electrolysis at a pH greater than 8.0;
- and
- recovering said pulp.
4 more elements
Dependencies are inferred from the claim text.