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254 results on '"Hou, Qingxi"'

66. From Biomass to Nanomaterials: A Green Procedure for Preparation of Holistic Bamboo Multifunctional Nanocomposites Based On Formic Acid Rapid Fractionation

Author

Zhang, Yongchao, primary, Xu, Wenyang, additional, Wang, Xiaoju, additional, Ni, Shuzhen, additional, Rosqvist, Emil, additional, Smått, Jan-Henrik, additional, Peltonen, Jouko, additional, Hou, Qingxi, additional, Qin, Menghua, additional, Willför, Stefan, additional, and Xu, Chunlin, additional

Published
2019
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68. Facile fractionation of bamboo hydrolysate and characterization of isolated lignin and lignin-carbohydrate complexes.

Author

Wang, Xiaodi, Zhang, Yongchao, Wang, Luyao, Wang, Xiaoju, Hou, Qingxi, Willför, Stefan, Fu, Yingjuan, Qin, Menghua, and Xu, Chunlin

Subjects
LIGNINS, LIGNIN structure, LIGNANS, BAMBOO, SOLVENT extraction, SEPARATION (Technology), ORGANIC solvents, LIGNOCELLULOSE
Abstract

An efficient separation technology for hydrolysates towards a full valorization of bamboo is still a tough challenge, especially regarding the lignin and lignin-carbohydrate complexes (LCCs). The present study aimed to develop a facile approach using organic solvent extraction for efficiently fractionating the main components of bamboo hydrolysates. The high-purity lignin with only a trace of carbohydrates was first obtained by precipitation of the bamboo hydrolysate. The water-soluble lignin (WSL) fraction was extracted in organic solvent through a three-stage organic solvent extraction process, and the hemicellulosic sugars with increased purity were also collected. Furthermore, a thorough characterization including various NMR techniques (31P, 13C, and 2D-HSQC), GPC, and GC-MS was conducted to the obtained lignin-rich-fractions. It was found that the WSL fraction contained abundant functional groups and tremendous amount of LCC structures. As compared to native LCC of bamboo, the WSL fraction exhibited more typical LCC linkages, i.e. phenyl glycoside linkage, which is the main type of chemical linkage between lignin and carbohydrate in both LCC samples. The results demonstrate that organic phase extraction is a highly efficient protocol for the fractionation of hydrolysate and the isolation of LCC-rich streams possessing great potential applications. [ABSTRACT FROM AUTHOR]

Published
2021
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86. Structural changes of bamboo-derived lignin in an integrated process of autohydrolysis and formic acid inducing rapid delignification.

Author

Hou, Qingxi, Zhang, Yongchao, Xu, Wenyang, Willför, Stefan, Xu, Chunlin, Qin, Menghua, Fu, Yingjuan, Wang, Zhaojiang, and Li, Zongquan

Subjects
*BAMBOO, *LIGNINS, *FORMIC acid, *DELIGNIFICATION, *DOSE fractionation
Abstract

Bamboo chips were efficiently fractionated using an integrated process of autohydrolysis and formic acid to induce rapid delignification. Autohydrolysis pretreatment facilitated oligosaccharide production, while the subsequent rapid-delignification using formic acid at a low liquid/solid ratio with a relatively short reaction time allowed obtaining cellulose fibers and lignin. The major inter-unit linkages of side-chain in lignin were cleaved during the combined fractionation process. The lignin fraction exhibited higher purity, more phenolic OH groups, less condensed phenolic OH groups, and higher syringyl/guaiacyl ratio (S/G) as compared to MWL and formic acid lignin from the direct formic acid delignification. These results indicate that the combined fractionation process presents a promising approach to the commercial utilization in the biorefinery industry. [ABSTRACT FROM AUTHOR]

Published
2018
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98. AchievingRefining Energy Savings and Pulp Propertiesfor Poplar Chemithermomechanical Pulp Improvement through OptimizedAutohydrolysis Pretreatment.

Author

Hou, Qingxi, Liu, Lihui, Liu, Wei, Wang, Yang, Xu, Ningpan, and Liang, Qian

Subjects
*THERMOMECHANICAL treatment, *HYDROLYSIS, *BIOMASS, *RAW materials, *ENERGY consumption, *STORM water retention basins
Abstract

Pretreatmentof biomass is expected to improve the pulp propertiesand facilitate the main components in the raw materials to be betterused. In this work, the refining energy consumption and propertiesof the poplar chemithermomechanical pulp (CTMP) from different autohydrolysispretreatment intensities of wood chips were investigated, and thepulp bleaching ability was also studied. The results showed that theCTMP with autohydrolysis pretreatment at a severity factor of 3.47could have a 26% energy reduction in pressurized refining, a 60% energysaving in PFI refining, and 44% and 46% increases in tensile and tearindices, respectively. Autohydrolysis pretreatment prior to pulpingcould result in CTMP with a higher water retention value, higher finescontent, better strength properties, lower shives content, and lowerbulk and ISO brightness after PFI refining. The brightness of CTMPcan be improved by alkaline peroxide bleaching. [ABSTRACT FROM AUTHOR]

Published
2014
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