Cellulose phosphoric acid-treated, products

Table 6.3 summarizes mass spectrometric analysis data of the decomposition gaseous products of mono- and dihydrazinium phosphate, mono- and diammonium phosphate, and phosphoric acid treated celluloses. 

Cellulose phosphate esters are produced from reaction with phosphoric acid and urea. The products are used to treat hypercalciuria because of its ability to bind calcium. It has also been used for the treatment of kidney stones. 

Amyloid.—When treated with concentrated sulphuric acid cellulose dissolves and undergoes hydrolysis. If the solution is diluted with water a gelatinous product is obtained which gives the blue color with iodine characteristic of starch. This product is known as amyloid. When boiled in the dilute acid the amyloid is hydrolyzed and dextrin and finally glucose are obtained. Concentrated hydrofluoric acid and phosphoric acid also dissolve cellulose. With glacial acetic acid in the presence of acetic anhydride and sulphuric acid cellulose yields acetyl derivatives indicating its alcoholic character. From the products of this reaction the acetate of a di-saccharose is obtained. 

Esterification of cellulose with phosphoric acid yields a product which is not inflammable, but is of no use because the loss of tensile strength is excessive. The loss of strength is avoided if the esterification is carried out in the presence of urea (Brit. Pat. 604197) or cyanamide (Brit. Pat. 634690). The treated fabrics, however, are rather brittle and the flame-resisting effect does not stand up to repeated washings. 

---