Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1987-09-21
1990-03-27
Hastings, Karen M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 301, 162 31, 423DIG3, 159 473, D21C 1110
Patent
active
049117874
ABSTRACT:
A method and apparatus are disclosed for concentrating an alkaline waste liquor containing sulfur compounds, the so-called black liquor, which is discharged from a step of Kraft-cooking wood fibers, in order to recover the cooking chemicals from said waste liquor, characterized in that CO.sub.2 gas and/or a gas containing CO.sub.2 gas is added to said waste liquor as a boiling-point-lowering agent, viscosity-lowering agent and solidification promoter, after a step of oxidizing said waste liquor and in or prior to one or more stages during the step of concentrating said waste liquor. Also disclosed is an apparatus for concentrating an alkaline waste liquor containing substantially no sulfur compounds (i.e., an AP black liquor), comprising (1) a primary concentrator for concentrating the AP black liquor discharged from said cooking means and washing means, (2) a secondary concentrator for further concentrating the AP black liquor concentrated in said primary concentrator and (3) exhaust gas absorbing means disposed between said primary and secondary concentrators.
REFERENCES:
patent: 3299942 (1967-01-01), Jacoby
patent: 3525666 (1970-08-01), Brannland
patent: 3549314 (1970-12-01), Shah
patent: 3635790 (1972-01-01), Heath
patent: 3714911 (1973-07-01), Pradt
patent: 4239589 (1986-12-01), Elton et al.
patent: 4331507 (1982-05-01), Roberts
patent: 4504356 (1985-03-01), Mulder et al.
Hasegawa Keiji
Nagato Shuichi
Shimokura Akira
Tanae Kazushige
Yaguchi Tokiya
Hastings Karen M.
Research Association of Pulp and Paper Technology
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