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36 results on '"Long, Jinxing"'

27. Oxidation of Organosolv Lignin in a Novel Surfactant-free Microemulsion Reactor

Author

Hongyan He, Yingying Wang, Juanhua Kong, Chen Xiumin, Xin Luo, Li Xuehui, Qiang Zeng, Long Jinxing, Lixia Li, Zhenping Cai, and Sijie Liu

Subjects
Solvent, chemistry.chemical_compound, Monomer, Chemical engineering, Chemistry, Depolymerization, Yield (chemistry), Organosolv, Lignin, Microemulsion, Octane
Abstract

Lignin is considered as a promising substitute for fossil resources, but the efficient conversion of the lignin remains a huge challenge due to its structural complexity and immiscibility with typical solvents. Herein, a series of surfactant-free microemulsion reactors comprised of octane, water and n-propanol were designed and their corresponding phase behaviors alongside their ability to intensify oxidative depolymerization of lignin was explored. Experimental results show that the phenolic monomer yield improves substantially (40-500 wt.%) when the novel microemulsion systems are employed by comparison with processes performed in a single solvent. Detailed characterizations also suggest that the above intensification is rationalized by the solubilization effect of the microemulsion system, which arise as a consequence of directional aggregation of lignin at the microemulsion interface.

Published
2020
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29. Catalytic Synthesis of Trimethylolpropane in the Presence of Basic Ionic Liquid

Author

Shu Riyang, Long Jinxing, Yuan Zheng-Qiu, LI Xue-Hui, and Ma Hao

Subjects
chemistry.chemical_compound, chemistry, Homogeneous, Yield (chemistry), Ionic liquid, Organic chemistry, Physical and Theoretical Chemistry, Trimethylolpropane, Heterogeneous catalysis, Alkali metal, Butyraldehyde, Catalysis
Abstract

Ionic liquid (IL) catalyst attracts increasing attention during last few decades due to its excellent advantages of both homogeneous and heterogeneous catalyst. Here, a novel and efficient strategy for the production of trimethylolpropane (TMP) is proposed with basic IL catalysts. The catalytic activities of the IL catalysts are investigated. The effects of catalyst dosage, reaction temperature, time, and the molar ratio of the reactants are also studied. The results show that the basicity of the IL catalyst has a significant effect on the catalytic activity, where stronger basicity indicates higher catalytic activity. The IL 1-butyl-3-methyl imidazolium hydroxyl ([bmim]OH) is proven to be the most efficient catalyst where more than 84% isolated yield of TMP was obtained under optimized conditions. Furthermore, both the IL catalyst and butyraldehyde show excellent recyclability. Moreover, this IL catalytic system avoids the inevitable desalination encountered by current processes utilizing inorganic alkali catalysts.

Published
2015
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36. Selective Synthesis of Biogasoline Precursor from Renewable Platform Molecules at Ambient Temperature.

Author

Long, Jinxing, Zhang, Xiong, Lv, Cheng, Liu, Sijie, Song, Changhua, and Li, Xuehui

Abstract

The condensation of the dilute platform biochemical from the renewable lignocellulosic cellulose depolymerization for high quality energy production has attracted increasing attention currently. In this study, we propose an efficient process for biogasoline precursor production from the furfural and ethyl levulinate through the Aldol reaction at the ambient temperature. The results show that the furfural and ethyl levulinate can be efficiently condensed with the catalyst of commercial alkalis. Under the optimized condition, 78% of the product isolated yield can be obtained in the presence of KOH. Furthermore, the final product analysis using FT-IR, GPC, 1 H-NMR, 13 C-NMR and elemental analysis demonstrates that it mainly composes of 3-(furan-2-yl(hydroxy)methyl)-4-oxopentanoate acid, an excellent precursor for C9 branched hydrocarbon of gasoline. Moreover, the investigation shows that the product distribution of this Aldol process is high temperature dependent, higher temperature resulting in the recondensation of the product, hence decreasing the C9 gasoline precursor selectivity. [ABSTRACT FROM AUTHOR]

Published
2016
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