Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1975-03-19
1976-07-13
Lindsay, Jr., Robert L.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 34, 162 36, 162 40, 162 42, 162 45, 162 51, 162 65, 162 82, 162 86, 162 90, D21C 1108
Patent
active
039691845
ABSTRACT:
The invention relates to a continuous method of making cellulosic pulp from wood chips within a range of yield from 65 to 90 per cent by digestion with a digestion liquor containing Na.sub.2 S and Na.sub.2 CO.sub.3. The digestion is effected at temperatures between 150.degree. and 190.degree.C and malodorous sulfur compounds are removed from the pulp, the liquor and the vapors prior to their withdrawal from the digesting process. In order to eliminate their capacity of emitting obnoxious odors, the sulfur compounds are oxidized by addition of molecular oxygen to the digester prior to discharge of pulp and spent liquor from the digester after which the spent liquor is removed from the digested pulp, concentrated and burned for renewed use in preparation of fresh digesting liquor.
REFERENCES:
patent: 486339 (1892-11-01), Johnston
patent: 1454339 (1923-05-01), Richter
patent: 1818913 (1931-08-01), Carr
patent: 2830869 (1958-04-01), Limerick
patent: 3347739 (1967-10-01), Tomlinson
patent: 3362868 (1968-01-01), Backlund
patent: 3525665 (1970-08-01), Gessner
patent: 3549314 (1970-12-01), Shah
patent: 3617434 (1971-11-01), Nakafuri et al.
patent: 3796628 (1974-03-01), Sen
patent: 3842160 (1974-10-01), Brannland et al.
canovali et al., "Case History of . . . Odor Reduction System," TAPPI, vol. 53, No. 8, 8-1970, pp. 1488-1493.
Corbin Arthur L.
Defibrator AB
Lindsay, Jr. Robert L.
Munson Eric Y.
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