Method for the preparation of novel ion exchangers on the basis of cellulose

Abstract

Abstract OR SALTS THEROF, WHERE R2 R3 AND R4 EACH REPRESENT HYDROGEN OR AN OPTIONALLY HYDROXY-SUBSTITUTED LOWER ALKYL GROUP CONTAING 1-4 CARBON ATOMS, THE DEGREE OF SUBSTITUTION CORRESPONDING TO AN ION EXCHANGE CAPACITY IN THE RANGE OF FROM 0.2 TO 1.8 MILLIEQUIVALENT PER GRAM PREFERABLY FROM 0.5 TO 1.2 MILLIEQUIVALENTS PER GRAM OF DRY SUBSTANCE, THE GRAINS CONTAINING 2-25% OF CELLULOSE CALCULATED AS UNSUBSTITUTED PRODUCT IN WEIGHT PER VOLUME, AND HAVING PORES ESSENTIALLY LYING IN THE RANGE OF FROM 2 TO 2000 MU IS DISCLOSED IN WHICH METHOD THE SUBSTITUTED CELLULOSE IS DISSOLVED IN AN ALKALINE MEDIUM TO A CONCENTRATION OF 1-15%, PREFERABLY 3-10%, CALCULATED IN WEIGHT PER VOLUME, AND THE RESULTING SOLUTION IS EMULSIFIED TO DROPLET FORM IN A WATER-IMMISCIBLE SOLVENT, AND THE OBTAINED EMULSION IS CONTACTED WITH AN ACID REACTING SUBSTANCE OR A SUBSTANCE CAPABLE OF FORMING AN ACID REACTING SUBSTANCE IN CONTACT WITH THE EMULSION, IN A QUANTITY SUFFICIENT TO NEUTRALIZE THE ALKALINE MEDIUM, SO THAT THE SUBSTITUTED CELLULOSE IS PRECIPITATED IN THE FORM OF ROUND PORE GRAINS OF ESSENTIALLY THE SAME SIZE AS THE DROPLETS. -N(+)(-R2)(-R3)-R4 OH(-) OR A QUATERNIZED AMINO GROUP OF THE FORMULA -N(-R2)-R3 A METHOD FOR THE PREPARATION OF ION EXCHANGERS CONSISTING OF ROUND GRAINS OF CELLULOSE SUBSTITUTED BY GROUPS OF THE FORMULA-R1Z, WHEREIN R1 IS A LOWER ALKYLENE GROUP CONTAINING 1-3 CARBON ATOMS, SAID ALKYLENE BEING OPTIONALLY SUBSTITUTED BY A HYDROZYL GROUP, AND Z IS A CARBOXYLIC, SULFO OR PHOSPHONO GROUP OF SALTS THEREOF OR AN ANIMO GROUP OF THE FORMUA

Inventors

• 👤 Bjorn Arild Andreassen

Bibliographic Details