Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1994-04-08
1997-01-14
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 19, 162 41, 162 37, 162 76, 162 60, D21C 104, D21C 300
Patent
active
055935443
ABSTRACT:
A method of manufacturing chemical pulp out of comminuted cellulosic fiber material comprising digesting the fiber material with digestion liquid without preceding peroxide stage. According to the invention the comminuted fiber material is treated in at least one stage prior to said digestion, in the presence of a liquid containing at least one compound having the ability to form complexes with metals existing naturally in the fiber material.
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patent: 4045280 (1977-08-01), Mackie
patent: 4091749 (1978-05-01), Procter et al.
patent: 4826567 (1989-05-01), Gratzl
patent: 5143581 (1992-08-01), Devic
patent: 5183535 (1993-02-01), Tikka
Fahlgren Christer
Gustavsson Soren
Johansson Ewa W.
Tibbling Petter
Czaja Donald E.
Fortuna Jos'e A.
Kvaerner Pulping Aktiebolag
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