Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1976-07-26
1978-07-04
Corbin, Arthur L.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
55 73, 55 84, 162 31, 162 33, 162 35, 162 36, 162 38, 162 51, 162 82, 162 83, 162 87, 210 45, 210 60, 210 62, 210 63R, 423221, 423480, 423514, 423539, 423541R, 423567R, D21C 1110, D21C 1112
Patent
active
040986390
ABSTRACT:
A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping liquor, which comprises evaporating and burning spent sulfate pulping liquor to obtain a smelt; dissolving the resulting smelt in water to form a sodium-sulfide-sodium carbonate-containing solution green liquor; regenerating pulping white liquor containing sodium sulfide and sodium hydroxide from said green liquor; and recirculating said regenerated white liquor to the pulping stage; oxidizing at least one of the resulting green and white liquors to form sodium thiosulfate therein; reacting the oxidized liquor with residual acid liquor, from the manufacture of chlorine dioxide by reduction of an alkali metal chlorate solution, to convert thiosulfate to sulfur dioxide and sulfur; removing and recovering formed sulfur dioxide; and returning the residual liquor, freed from sulfur dioxide, to the pulping.
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patent: 3950217 (1976-04-01), Reeve
Casey, Pulp & Paper, vol. I, 1960, pp. 498-502.
Noreus Sture Erik Olof
Uhlin Lars Tage
Corbin Arthur L.
Mo och Domsjo Aktiebolag
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