title: Low Temperature Soda-Oxygen Pulping of Bagasse.
abstract: Wood shortages, environmental pollution and high energy consumption remain major obstacles hindering the development of today's pulp and paper industry. Energy-saving and environmental friendly pulping processes are still needed, especially for non-woody materials. In this study, soda-oxygen pulping of bagasse was investigated and a successful soda-oxygen pulping process for bagasse at 100 °C was established. The pulping parameters of choice were under active alkali charge of 23%, maximum cooking temperature 100 °C, time hold at maximum temperature 180 min, initial pressure of oxygen 0.6 MPa, MgSO4 charge 0.5%, and de-pithed bagasse consistency 12%. Properties of the resultant pulp were screened yield 60.9%, Kappa number 14, viscosity 766 dm³/kg, and brightness 63.7% ISO. Similar pulps were also obtained at 110 °C or 105 °C with a cooking time of 90 min. Compared with pulps obtained at higher temperatures (115-125 °C), this pulp had higher screened yield, brightness, and acceptable viscosity, while the delignification degree was moderate. These results indicated that soda-oxygen pulping at 100 °C, the lowest cooking temperature reported so far for soda-oxygen pulping, is a suitable process for making chemical pulp from bagasse. Pulping at lower temperature and using oxygen make it an environmental friendly and energy-saving pulping process.
authors.affiliation: Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China. fyue@wisc.edu.|State Kay Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China. fyue@wisc.edu.|Department of Biochemistry and Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53726, USA. fyue@wisc.edu.
authors.forename: Fengxia
authors.initials: F
authors.lastname: Yue
authors.affiliation: Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China. chenkeli_prof@sina.com.
authors.forename: Ke-Li
authors.initials: KL
authors.lastname: Chen
authors.affiliation: State Kay Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China. fachuanglu@wisc.edu.|Department of Biochemistry and Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53726, USA. fachuanglu@wisc.edu.
authors.forename: Fachuang
authors.initials: F
authors.lastname: Lu
mesh_terms: D000468:Alkalies / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry*; D055772:Green Chemistry Technology / Q000379:methods*; D006358:Hot Temperature; D006801:Humans; D066192:Manufacturing Industry / Q000379:methods*; D010100:Oxygen / Q000737:chemistry; D010209:Paper; D011312:Pressure; D014783:Viscosity
chemical_list: D000468:Alkalies; D002482:Cellulose; C027433:bagasse; D010100:Oxygen
keywords: Kappa number; bagasse; brightness; energy-saving; environmentally friendly; low temperature; soda-oxygen pulping