title: Improved process for the production of cellulose sulfate using sulfuric acid/ethanol solution.
abstract: An improved process for production of cellulose sulfate (CS) was developed by using sulfuric acid/ethanol solution as sulfonating agent and Na2SO4 as water absorbent. The FTIR, SEM and TG analysis were used to characterize the CS prepared. The total degree of substitution and viscosity of the product solution (2%, w/v) were ranging from 0.28 to 0.77 and from 115 to 907 mPa s, respectively, by changing the process parameters such as the amount of Na2SO4, the reaction time, the temperature, the sulfuric acid/alcohol ratio and liquid/solid ratio. The results indicated that the product with DS (0.28-0.77) and η2% (115-907) mPa s could be produced by using this improved process and more cellulose sulfate could be produced when cellulose was sulfonated for 3-4 h at -2 °C in sulfuric acid/ethanol (1.4-1.6) solution with addition of 0.8 g Na2SO4. The (13)C NMR indicated that the sulfate group of CS produced using sulfuric acid/ethanol solution was at C6 position.
authors.affiliation: Department of Biotechnology and Bioengineering, Huaqiao University, Xiamen 361021, PR China. chenguo@hqu.edu.cn
authors.forename: Guo
authors.initials: G
authors.lastname: Chen
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Hongwen
authors.initials: H
authors.lastname: Chen
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D013431:Sulfates; D013464:Sulfuric Acids; C012036:sodium sulfate; D000431:Ethanol; D002482:Cellulose; C020254:cellulose sulfate; C033158:sulfuric acid