CRYSTALLINE SULFATED CELLULOSE II AND ITS PRODUCTION OF SULFURIC ACID HYDROLYSIS OF CELLULOSE

摘要

1. Crystalline, soluble in sulfuric acid sulfated cellulose II, having a degree of polymerization (SP) ≤60.2. Crystalline sulfated cellulose II according to claim 1, recrystallized from solution. A method for producing crystalline sulfated cellulose II, comprising: diluting the spent liquid of sulfuric acid hydrolysis of cellulose with an aqueous diluent, separating the diluted waste liquid from acid-insoluble sulfated cellulose I material and forming crystalline sulfated cellulose II from the separated diluted waste liquid. 4. The method according to claim 3, in which crystalline sulfated cellulose II has (SP) ≤60.5. The method according to claim 3, wherein the aqueous diluent is 0-40% aqueous sulfuric acid. The method according to claim 4, wherein the aqueous diluent is 0-40% aqueous sulfuric acid. The method according to claim 3, wherein said formation comprises mixing the separated diluted spent liquid with water. The method according to claim 4, wherein said formation comprises mixing the separated diluted spent liquid with water. The method of claim 5, wherein said formation comprises mixing the separated diluted spent liquid with water. The method of claim 6, wherein said formation comprises mixing the separated diluted spent liquid with water. The method according to any one of claims 3 to 10, wherein said formation comprises heating the separated diluted spent liquid at a temperature of from 30 ° C to 80 ° C for up to 48 hours. The method according to any one of claims 3 to 10, wherein said cellulose is fully