Ultrasonic treatment for enhancing the accessibility and reactivity of softwood rayon-grade kraft-based dissolving pulp
- 78 Downloads
The cellulose reactivity is a critical parameter in the manufacturing process of viscose rayon with dissolving pulp. In this study, an ultrasonic treatment, which is considered as an environmentally friendly pretreatment technology, was applied to a softwood prehydrolysis kraft-based dissolving pulp for enhancement of accessibility/reactivity in terms of viscose rayon production through cavitation of ultrasound. Results show that the ultrasonic treatment can lead to the decrease of cellulose crystallinity, the increase of specific surface area and average pore diameter in fibers, and the increase of water retention value due to the release of energy induced by the collapse of the gas/vapor bubbles. As a consequence, the Fock reactivity and viscose filterability of dissolving pulp is enhanced significantly after ultrasonic treatment. Other parameters, such as intrinsic viscosity and fiber morphology were also determined.
KeywordsCellulose Reactivity Ultrasonic treatment Dissolving pulp Crystallinity
The authors are grateful for the financial supports from the National Natural Science Foundation of China (Grant No. 31770633), Natural Science Foundation of Fujian Province (Grant No. 2015J01074), Educational Commission of Fujian Province (Grant No. JA15171), and Jiangsu Provincial Key Laboratory of Pulp and Paper Science &Technology (Grant No. 201518).
- Bi L, Zhao Z, Vinatoru M, Chen Y, Li D, Gu Y, Wang J (2007) Research progress of application of ultrasonic technology to biomass resources processing. Chem Ind For Prod 27:138–142Google Scholar
- FZ/T 50010.13. (2011) Pulp board viscose fiber-determination for reaction property. Ministry of Industry and Information Technology Press, BeijingGoogle Scholar
- Huang C (1995) Revealing fibril angle in wood sections by ultrasonic treatment. Wood Fiber Sci 27:49–54Google Scholar
- Iwasaki T, Lindberg B, Meier H (1962) The effect of ultrasonic treatment on individual wood fibers. Svensk Papperstidning 20:795–816Google Scholar
- Krässig HA (1993) Cellulose-structure, accessibility and reactivity. Yverdon, Gordon and Breach Science Publishers, YverdonGoogle Scholar
- Li S, Liu X, Zhuang X, Guan Y, Cheng G (2003) Ultrasonic treatment of cotton pulp cellulose. Chin J Appl Chem 20:1030–1034Google Scholar
- Tang A, Liang W (2000) Studies on the structure changes of fast-growing wood fiber treated by ultrasonic wave. Tech Acoust 19:78–83Google Scholar