Low Temperature Soda-Oxygen Pulping of Bagasse

Molecules

Fengxia Yue¹  Ke-Li Chen¹  Fachuang Lu² 

[1]Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China

[2]

[3]State Kay Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

关键词: bagasse;    brightness;    Kappa number;    low temperature;    soda-oxygen pulping;    environmentally friendly;    energy-saving;   

DOI  :  10.3390/molecules21010085

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.