Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1977-12-07
1978-12-05
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
23230A, 55 18, 55 71, 162 62, 162 67, 162236, 162238, 162DIG10, 203 3, D21C 914, D21C 1106
Patent
active
041284542
ABSTRACT:
Wood pulp is bleached with chlorine dioxide gas. The gas is obtained by feeding a chlorine dioxide solution to a stripper. Shredded or fluffed pulp is exposed to a controlled amount of chlorine dioxide gas for a time period sufficient to obtain the required pulp brightness. The amount of unused chlorine dioxide gas is continuously monitored. The controlled amount of chlorine dioxide gas fed to the bleaching system is automatically adjusted by controlling the amount of chlorine dioxide solution fed to the stripper in response to changes in the amount of unused chlorine doxide gas leaving the bleaching system. Unreacted gases are recycled back to the stripper in response to the concentration of chlorine dioxide gas conducted from the stripper to the reaction area.
REFERENCES:
patent: 3486971 (1969-12-01), Weyrick
patent: 3586599 (1971-06-01), Yorston et al.
patent: 3729375 (1973-04-01), Chappelle
patent: 3745065 (1973-07-01), Rama
patent: 3814664 (1974-06-01), Carlsmith
patent: 3963561 (1976-06-01), Richter
patent: 3964962 (1976-06-01), Carlsmith
Danforth et al.; "Bleach Plant Computer Control" Tappi; vol. 58, No. 3; pp. 91-94.
Alvo Steve
Fisher Richard V.
Ingersoll-Rand Co.
Troidl Frank S.
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