Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1992-11-30
1994-11-22
Jones, W. Gary
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
42324309, 42324311, 423519, 162 29, 162 51, 159 45, 159 49, 159DIG8, C01B 1748
Patent
active
053667166
ABSTRACT:
Sulphur dioxide is separated from the flue gases of a cellulose pulp mill by absorbing it into a sodium sulphite solution. Sulphur dioxide is regenerated from the sodium bisulphite solution produced by an evaporation-crystallization method utilizing thermo-compressor evaporation technique. A lamella evaporator is utilized as the evaporator-crystallizer, the evaporator being divided into separate compartments for ease of cleaning the lamella surfaces. The recovered concentrated sulphur dioxide can be used wherever desired, for example for the production of chlorine dioxide.
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Rapson et al., "The Effluent-Free Bleaching Kraft Pulp Mill", Sep. 1973, Tappi, vol. 56, No. 9, pp. 112-115.
A. Ahlstrom Corporation
Jones W. Gary
Nguyen Dean T.
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