Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1997-05-02
2000-02-29
Nguyen, Dean T.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 3011, 162 31, 422185, 422227, D21C 1112
Patent
active
060304936
ABSTRACT:
Provided is a process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignificatation of fibrous raw material. The spent liquor is gasified in at least two reactors, a first and a second stream of solid and/or smelt material and of combustible gaseous material being formed. The formed material is treated in one or more devices (5, 6, 7, 8), whereby a first (9) and a second liquor (27) are formed. The pressure and/or temperature in the first reactor differ(s) from the pressure and/or temperature in the second reactor. In addition, one or more process chemicals are recovered selectively from the formed liquor and/or gas, and are thereafter returned in whole or in part to one or more of the reactors (1, 2) and/or to one or more of the devices (5, 6, 7, 8) for treatment of the formed material.
REFERENCES:
patent: 3841962 (1974-10-01), Procter et al.
patent: 5326433 (1994-07-01), Ryham et al.
patent: 5489363 (1996-02-01), Marcoccia et al.
patent: 5509997 (1996-04-01), Kuusio
Kvaerner Pulping AB
Melcher Jeffrey S.
Nguyen Dean T.
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