Cellulose phosphate as cation-exchanger was prepared by the following method; 25g of urea was dissolved to 18.2g of 75% phosphoric acid, and this solution was mixed with 5g of cellulose (paper pulp) uniformly. The mixture was held at 170°C for 1hr., washed with water and dried at 90°C.
The product is a weak yellow fibrous material containing 10-11% phosphorous (P) and has the value of about 4 meq (Fe³⁺)/g as the maximum ion exchange capacity.