C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
134/39, 362/40
C02F 1/42 (2006.01) B01J 39/22 (2006.01)
Patent
CA 1168951
Abstract of the Disclosure. A cation exchanger is produced by treating comminuted bark in separate steps with an alkali hydroxide solution of at least 5% by weight, preferably 20-40% by weight, and with 30-75% by weight sulphuric acid, preferably 50-65% by weight. After each step washing with water is performed until the pH-value after the alkali hydroxide treatment goes below 9 and after the sulphuric acid treatment goes above 3. Preferably, the treatment with alkali hydroxide precedes the treatment with sulphuric acid. The treatment with alkali hydroxide is carried out for .5-20 hours, preferably 3-10 hours, and the treat- ment with sulphuric acid is carried out from .5-8 hours, preferably from 1-6 hours. The cation exchanger can be regenerated with alka- li hydroxide solution, particularly sodium hydroxide solution. The cation exchanger is suitable for the purification of waste water and can be produced at low cost.
392802
Fetherstonhaugh & Co.
Jýrgensen Sven E.
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