Green and Effective Ammonium Carbonate-assisted Process for Drying Hemicellulose Obtained through Alkali Extraction of Bleached Bamboo Kraft Pulp |
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作者姓名: | Xiaoqi Gong Zongwei Zhang Yonghao Ni Xinhua Ouyang Lihui Chen Liulian Huang Huichao Hu |
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作者单位: | College of Material Engineering;Department of Chemical Engineering |
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基金项目: | the National Key Research and Development Program of China(2017YFB0307900,2019YFC1905903);the National Natural Science Foundation of China(31700507);the Major Project on the Integration of Industry-Education-Research of Fujian Provincial Department of Science and Technology(2018H6003). |
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摘 要: | 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.
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关 键 词: | bamboo kraft pulp HEMICELLULOSE alkali extraction ammonium carbonate drying process dissolving pulp |
收稿时间: | 2020/10/30 0:00:00 |
Green and Effective Ammonium Carbonate-assisted Process for Drying Hemicellulose Obtained through Alkali Extraction of Bleached Bamboo Kraft Pulp |
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Authors: | Gong Xiaoqi Zhang Zongwei Ni Yonghao Ouyang Xinhu Chen Lihui Huang Liulian Hu Huichao |
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Affiliation: | 1.College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, 350002, China;2.Department of Chemical Engineering, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada |
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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. |
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Keywords: | bamboo kraft pulp hemicellulose alkali extraction ammonium carbonate drying process dissolving pulp |
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