Production of cellulose carbamate for making cellulose molding, e.g. fibers, film or granules, involves in situ-activation of cellulose in water-immiscible solvent with aqueous urea and sodium hydroxide solution, removing water and reaction

摘要

Production of cellulose carbamate (I) in a series of organic reaction stages comprises (a) in situ-activation of cellulose (II) in the presence of a water-immiscible organic solvent (III) and an aqueous solution containing urea and sodium hydroxide (NaOH; (b) separation of the water; (c) reaction to (I) at 120-180degreesC; and (d) separation of (I) from (III).