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Green and Effective Ammonium Carbonate-assisted Process for Drying Hemicellulose Obtained through Alkali Extraction of Bleached Bamboo Kraft Pulp
Received:October 30, 2020    Click here to download the full text
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Author NameAffiliation
Gong Xiaoqi College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China 
Zhang Zongwei College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China 
Ni Yonghao College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China
Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada 
Ouyang Xinhua College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China 
Chen Lihui College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China 
Huang Liulian College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China 
Hu Huichao College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China 
 
Abstract:Hemicellulose has a wide range of applications, including that as an emulsifier for the food industry and raw material for the synthesis of bioethanol/biochemicals and biodegradable films. Hemicellulose is usually present as a spent liquor, such as the prehydrolysis liquor of the prehydrolysis kraft dissolving pulp production process and the alkali extraction liquor of the cold caustic extraction of pulp fibers. Due to its dilute nature, hemicellulose needs to be dried for practical utilization, and this is challenging. In this study, cellulose and hemicellulose in a bleached bamboo kraft pulp were separated using an alkali extraction process. Hemicellulose obtained from the extraction liquor was dried by an ammonium carbonate-assisted drying process. The effects of drying time and drying temperature were determined. Structure of the hemicellulose obtained by the ammonium carbonate-assisted drying process was similar to that of original hemicellulose, as revealed by detailed Fourier transform infrared and X-ray diffraction analyses. The novel drying method was more energy efficient and required a shorter drying time than the conventional freeze drying method, and the excellent solubility in alkaline solutions favored the chemical modification of hemicellulose. The dried hemicellulose can be used as a renewable raw material for the preparation of hydrogels and other substances such as bioethanol/biochemicals and biodegradable films.
keywords:bamboo kraft pulp  hemicellulose  alkali extraction  ammonium carbonate  drying process  dissolving pulp
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