Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Reexamination Certificate
2007-09-18
2007-09-18
Fortuna, Jose A. (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
C162S029000
Reexamination Certificate
active
10535998
ABSTRACT:
The method is for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp. A smelt (14) of chemicals principally consisting of Na2S and Na2CO3from a soda boiler (1) is provided. Weak liquor (15) that contains dissolved NaOH and CaO is provided. A dissolving tank (2) is provided in which the smelt (14) from the soda boiler (1) is dissolved in the weak liquor (15) it order to form green liquor (16). A solution of NaOH is added to the weak liquor (15), at a position before the weak liquor (15) is added to the dissolving tank, in order to increase the concentration of NaOH in the weak liquor (15) such that a fraction of CaO that is presently dissolved in the weak liquor (15) precipitates.
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Ingelman Magnus
Markusson Anita
Tjernberg Jan
Fasth Rolf
Fasth Law Offices
Fortuna Jos'e A.
Metso Fiber Karlstad AB
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