Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Reexamination Certificate
2004-03-25
2008-11-04
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
C162S009000, C162S017000, C162S018000, C162S019000, C162S038000, C162S042000, C162S059000, C162S070000, C162S076000
Reexamination Certificate
active
07445691
ABSTRACT:
The method is for pre-treatment of chips that are fed to a sulphate cooking process. Through acidification of the chips in an acidic treatment fluid with a subsequent draining of free treatment fluid before subsequent steaming or wet-steaming, a high concentration of free hydrogen ions is established within the chip pieces. When the chips are subsequently formed into slurry with preferably a sulphide-rich alkali cooking fluid, H2S is formed locally in the chip pieces which gives a yield-increasing effect in the subsequent cooking step of 1-3%.
REFERENCES:
patent: 3841962 (1974-10-01), Procter et al.
patent: 4475984 (1984-10-01), Cael
patent: 5587049 (1996-12-01), Marzolini et al.
patent: 6203662 (2001-03-01), Snekkenes et al.
Continuous Digester[downloaded online http://www.mediaviisi.fi/metsoautomation
eles/ApplicationReports/2611—Pulp/2611—02—01en.pdf], Metso Automation, Aug. 2003 [downloaded Jan. 2, 2007], whole document.
Olsson Krister
Snekkenes Vidar
Calandra Anthony J
Fasth Rolf
Fasth Law Offices
Hug Eric
Metso Fiber Karlstad AB
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