Electrochemical bleaching of wood pulps

Details Electrochemical bleaching of wood pulps Electrochemical bleaching of wood pulps

1985-12-23

1986-10-14

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25F 500

Patent

active

046170995

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.

REFERENCES:
patent: 747234 (1903-12-01), Ruthenburg
patent: 2307137 (1943-01-01), Kennedy
M. M. Nassar, O. A. Fadaly, and G. H. Sedahmed, "A New Electrochemical Technique for Bleaching Cellulose Pulp," J. Applied Electrochemistry, 13, 663 (1983).
M. M. Nassar, "Effect of a Chromium Salt on the Electrochemical Bleaching of Sulphite Pulp," Surface Technology, 21, 301 (1984).
M. M. Nassar, "Electrochemical Bleaching--A Novel Method for Bleaching Kraft and Sulphite Pulps," J. of Pulp and Paper Science, vol. 11, 17 (1985).

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