C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
134/39, 362/39
C02F 1/42 (2006.01)
Patent
CA 1169735
Abstract of the Disclosure. An anion exchanger is produced by treating cellulose or a cellulose derivative with a polyethylene imine solution of at least 1% by weight in an aqueous medium at a pH-value between 2 and 6, preferab- ly between 4 and 5, and recovering the ion exchanger from the re- action mixture. The reaction between cellulose or cellulose derivative and polyethylene imine can take place at ambient temperature, but may be promoted by using a temperature of 40-90° C, preferably 60-70°C. Preferred cellulose derivatives for use as starting material are sul- phonated lignocellulose or a cellulose material, e.g. bark which has been treated in separate steps with an alkali hydroxide solution and with sulphuric acid. The anion exchanger can be regenerated by el?- tion with sodium hydroxide and reactivated by treatment with poly- ethylene imine. The anion exchanger is suitable for the purification of waste water and can be produced at low cost.
393124
Fetherstonhaugh & Co.
Jýrgensen Sven E.
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