Compositions – Reductive bleachant – deoxidant – reductant – or generative – Sulfur containing reductant – bleachant – deoxidant – or...
Patent
1989-04-26
1991-08-20
Lovering, Richard D.
Compositions
Reductive bleachant, deoxidant, reductant, or generative
Sulfur containing reductant, bleachant, deoxidant, or...
2521882, 162 83, C01B 1762
Patent
active
050412370
ABSTRACT:
An aqueous solution containing sulphur dioxide and sodium in high percentages is obtained by bringing sulphur dioxide into contact with a recirculating aqueous solution of sodium hydroxide and previously absorbed sulphur dioxide to obtain a ratio between SO.sub.2 and the sum of SO.sub.2 and Na.sub.2 O of 0.61-0.66, preferably 0.63-0.65, and a concentration of SO.sub.2 and Na.sub.2 O amounting to 85-98%, preferably about 95% of the solubility maximum of the solution at the ratio and storage temperature in question.
The invention also relates to a solution having the aforesaid ratio of SO.sub.2 /(SO.sub.2 +Na.sub.2 O) and concentation and its use for sulphite cooking purposes or for bleaching purposes.
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Chemical Abstract, 95(14): 117684, "Production of Sodium Hydrogen Sulfite . . . ".
Masson, M. R. (Ed.), Solubility Data Series, vol. 26. Sulfites, Selenites and Tellurites, (1986) Pergamon Press, Oxford, England, pp. 39-45 and 72-77.
Anthony Joseph D.
Lovering Richard D.
Philpitt Fred
Stora Kopparbergs Berglags AB
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