B - Operations – Transporting – 01 – F
Patent
B - Operations, Transporting
01
F
8/81
B01F 3/04 (2006.01) C01B 17/62 (2006.01) C01D 5/14 (2006.01) D21C 3/06 (2006.01) D21C 3/12 (2006.01)
Patent
CA 1229454
ABSTRACT OF THE DISCLOSURE 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 SO2 and the sum of SO2 and Na2O of 0.61 - 0.66, preferably 0.63 - 0.65, and a concentration of SO2 and Na2O 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 SO2/(SO2 + Na2O) and concentration and its use for sulphite cooking purposes or for bleaching purposes.
480849
Ridout & Maybee Llp
Stora Kopparbergs Bergslags Ab
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