ION-EXCHANGERS ON THE BASIS OF CELLULOSE AND A METHOD FOR PREPARING THE SAME

摘要

1293611 Ion exchangers PHARMACIAFINE CHEMICALS AB 6 Feb 1970 [7 Feb 1969] 5688/70 Heading C3A An ion-exchanger consists of rounded particles of regenerated cellulose substituted by groups of the formula -R 1 -Z, wherein R 1 stands for a lower alkylene group, containing 1-3 carbon atoms and optionally substituted with a hydroxy group, and Z stands for a carboxylic, sulpho or phosphono group, or salts thereof, or an amino group of the formula or a quaternized amino group of the formula or salts thereof, wherein R 2 , R 3 and R 4 each stand for hydrogen or a lower alkyl group containing 1-4 carbon atoms optionally substituted with a hydroxyl group, the substitution degree corresponding to an ion exchange capacity within the limits of 0À2-1À8 milliequivalents per gram of dry substance, said particles containing substituted cellulose in an amount corresponding to 2 to 25 grams of unsubstituted cellulose per decilitre, and presenting pores substantially in the range of from 2 to 2000 mÁ. It may be prepared by treating regenerated cellulose particles with XR 1 Z, where X is halogen or oxygen forming part of an oxirane group in the presence of alkali; in examples, sodium chloroacetate, propane sultone, diethylaminoethylchloride hydrochloride, and chloromethylphosphonic acid are used. It may be cross-linked with divinyl benzene or X1-R-Y where R is a C 3 to C 10 aliphatic residue and X1 and Y are halogen or epoxy-oxygen such as epichlorhydrin, dichlorhydrin, 1,2,3,4-di-epoxy butane, bis-epoxypropyl ether, ethylene glycol bis-epoxypropyl ether or 1,4-butanediol bisepoxypropyl ether.