Ionically modified cellulose material, its preparation and its use
AssigneeCiba-Geigy Corporation
InventorsJurg Merz, Walter Voser
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Abstract
Ionically modified cellulose material in which the ionic moiety is linked to the cellulose moiety via the carbonyl group of the bridge member --CO--NH--CH.sub.2 --O-- is suitable for being employed as the stationary phase in processes for separating mixtures of ionically charged components by chromatography, if the ionically modified cellulose material is obtainable from microcrystalline wood cellulose in the form of powder, as the starting material, the cellulose having a degree of polymerization of 490 to 550, and the cellulose powder consisting of particles having a specific BET surface area of 0.8 to 1.1 m.sup.2 /g and a degree of swelling in water at 20.degree. C. of 4 to 6 ml/g.
Claims4
An ionically modified cellulose material in which each ionic moiety is linked to the cellulose moiety via a group of the formula
- --O--CH.sub.2 --NH--CO--,
- the carbonyl group being attached to the ionic moiety of the material and the oxygen atom being attached to the cellulose moiety of the material, which material is obtained from microcrystalline wood cellulose in the form of powder as the starting material, said cellulose powder having a degree of polymerisation of 490 to 550 and consisting of particles having a specific BET surface area of 0.8 to 1.1 m.sup.2 /g and a degree of swelling in water at 20.degree. C. of 4 to 6 ml/g.
Dependencies are inferred from the claim text.