Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1976-05-14
1977-12-27
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 62, 162238, 23230A, 23253A, 204 1T, 204195R, D21C 712
Patent
active
040653480
ABSTRACT:
In a paper pulp bleach plant, the concentration of residual caustic in solution with the pulp slurry may be measured as a function of the voltage across cathode and anode poles of an electrolytic cell comprising the pulp slurry solution as the electrolyte and ferro-metallic walls of the slurry container as the cathode or anode pole. The opposite cell pole is selected from a group of metals and alloys thereof discretely removed from iron in the electromotive series, the specific pole metal or alloy within the group being selected on the basis of resistance to chemical reactivity at the point of pole placement in the pulp flow stream. Control over the flow of caustic into the slurry flow stream may be exerted in response to an error signal generated from cascade management of the voltage emissions from two such cells positioned early and late, respectively, in the pulp flow stream respective to the caustic injection point.
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Burnett; "Computer Control of the Chlorine Stage" 7-1970 Pulp and Paper Magazine of Canada; pp. 57-62, vol. 71, No. 14.
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Alvo Steve
Bashore S. Leon
Marcontell W. Allen
Schmalz Richard L.
Westvaco Corporation
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