Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1993-12-27
1996-01-02
Lacey, David L.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 3011, 162 301, 159 473, 159DIG8, D21C 1100
Patent
active
054805120
ABSTRACT:
To decrease the sulfur emissions of a sulfate pulp mill, and achieve other advantages, black liquor is heated at a temperature higher than the cooking temperature of the sulfate cook (e.g. between 190.degree. C.-350.degree. C.) and the sulfidity of white liquor produced from the black liquor is adjusted by adjusting the temperature and/or retention time of the heat treatment so that a predetermined amount of sulfur compounds are separated from the black liquor. Pressure heat treatment may occur prior to or after evaporation of the black liquor, or between evaporation stages. Preferably, the sulfur containing gas is thereafter divided into different fractions which are separately cornbusted.
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patent: 4299652 (1981-11-01), Masuno et al.
patent: 4329199 (1982-06-01), Andersson et al.
patent: 4953607 (1990-09-01), Erkki et al.
Ryham, "A new Solution to Third Generation Chemical Recovery", TAPPI Proceedings, 1992 International Chemical Recovery Conference, pp. 581-588.
A. Ahlstrom Corporation
Lacey David L.
Nguyen Dean T.
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