9015-14-9

cation exchanger ~4.4 meq/g

cation exchanger

for protein immobilization and condensations with other amine-containing reagents.

Cellulose phosphates with a low phosphorus content are obtained by reacting cellulose or linters with phosphoric acid in an urea melt. Higher phosphorus contents and a lower degradation rate of the cellulose may be obtained with excess urea at reduced reaction time (ca. 15 min) and at high temperature (ca. 140 ℃). Water-soluble cellulose phosphate with a high degree of substitution may be obtained from a mixture of phosphoric acid and phosphorus pentoxide in an alcoholic medium.