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Optimization of hydrothermal pretreatment for co-utilization of xylose and glucose of cassava anaerobic residue for producing ethanol

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Chinese Journal of Chemical engineering 2019年第4期27卷 920-927页

作者： Huisheng Lü Jinyi Zhou Jiatao Liu Chunliu Lü Feng Lian Yonghui Li Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China

The development of a process that could recover biofuel from industrial cellulose waste can not only reduce the negative environmental impacts by using fossil fuels, but also bring a green idea for the waste’s disposing. In this study, hydrothermal pretreatment was optimized for cassava anaerobic residue, a cellulosic waste from cassava ethanol industry, to co-utilize xylose and glucose for producing bioethanol. The effect of the main pretreatment conditions, namely, temperature, solid content and time, was explored for the highest recovery of xylose in prehydrolysate and glucose in enzymatic hydrolysate. The single factor experiment results showed that the conditions for maximum xylose recovery in prehydrolysate and glucose recovery in enzymatic hydrolysate were 60℃, 75 min, 10% solids and 160℃, 75 min, 10% solids, respectively. Whereafter, response surface methodology(rSM) was applied to further optimize the pretreatment conditions for the maximum theoretical ethanol production through utilizing both xylose and glucose. A treatment at 163℃, for 59 min and with 9.5%solids was found optimal, with the highest ethanol production of 20.2 mg·g^-1 raw material. Furthermore, in order to assess the impacts of the pretreatment on cassava anaerobic residue, the changes in crystallinity and morphology for untreated and pretreated solids were investigated.

关键词： Waste treatment Biofuel Hydrothermal Cassava anaerobic residue Co-utilization response surface methodology

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Hollow nano-particles formation for CuO-CeO2-ZrO2 via a supercritical anti-solvent process

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Journal of rare Earths 2016年第11期34卷 1126-1133页

作者：姜浩锡周佳丽孙焕花李永辉张敏华 Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical TechnologyTianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China

Hollow CuO-CeO2-ZrO2nano-particles were prepared with supercritical anti-solvent apparatus by using methanol as sol-vent and supercritical carbon dioxide as anti-solvent. Two key factors （i.e., pressure and temperature） were investigated to explore the effects of catalyst structure and physic-chemical properties （i.e., morphology, reducing property, oxygen storage capacity and specific surface area）. The resulting materials were characterized with X-ray diffraction （Xrd）, high resolution transmission electron micros-copy （HrTEM）, Brunauer-Emmett-Teller （BET）,hydrogen temperature programmed reduction （H2-TPr） and oxygen storage capac-ity （OSC） measurement, respectively. The experimental results showed that lower temperatures promoted production of hollow struc-ture nano-particulates. The particle morphology also changed significantly, i.e. the solid construction was first transferred to hollow structure then back to solid construction. The optimal conditions for obtaining hollow nano-particles were determined at 45 °C, 18.0–24.0 MPa.

关键词： supercritical anti-solvent （SAS） CuO-CeO2-ZrO2 nano-particulate hollow structure rare earths

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research progress in the SO2 resistance of the catalysts for selective catalytic reduction of NOx

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Chinese Journal of Chemical engineering 2017年第12期25卷 1695-1705页

作者： Minhua Zhang Baojuan Huang Haoxi Jiang Yifei Chen Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China

The selective catalytic reduction （SCr） of NOx with NH3 has been proven to be an efficient technology for NOx conversion to N2. However, the catalysts used for SCr usually suffer from the problem of sulfur poisoning which seriously limits their practical application. This review summarized sulfur poisoning mechanisms of various SCr deNG catalysts and strategies to reduce deactivation caused by SO2 such as doping metals, controlling the structures and morphologies of the catalysts, and selecting appropriate supports. The methods and procedures of catalysts preparation and the reaction conditions also have effect on SO2-resistance of the catalysts. Several novel catalyst systems that exhibited good SO2 resistance are also introduced. This paper could provide guidance for the development of highly efficient sulfur-tolerant deNOx catalysts.

关键词： Words Selective catalytic reduction （SCr）SO2 resistance catalyst NOx

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Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol

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Chinese Journal of Chemical engineering 2019年第4期27卷 827-834页

作者： Huisheng Lü Zhi Wang Zhongfeng Geng Yonghui Li Shuangyan Liu Jiatao Liu Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072 China

Adsorption equilibria of paeoniflorin and albiflorin on a cyano-silica column(CN column) from the solution of supercritical carbon dioxide(scCO2) modified with ethanol were studied. The adsorption capacity at 308.15 K,313.15 K, 318.15 K and 323.15 K under pressures corresponding to carbon dioxide/ethanol densities from0.347 g·cm^-3 to 0.662 g·cm^-3 were determined using the elution by characteristic point method(ECP). The effects of temperature and pressure on the solute loading were investigated. The results showed that the lower the temperature, the higher the adsorption capacity. With the decrease of density of scCO2, the adsorption capacity strengthens. The maximum adsorption capacity of paeoniflorin(albiflorin) on the CN column was15.24 mg·ml^-1(31.14 mg·ml^-1) in the range of 0–1.84 mg·ml^-1(0–1.67 mg·ml^-1) of paeoniflorin(albiflorin)standard solution. The adsorption capacity of albiflorin was twice as much as that of paeoniflorin under the same conditions. Adsorption data of paeoniflorin and albiflorin could be well described by the Langmuir model and Freundlich model. Compared with the two model fitting results, the adsorption of paeoniflorin and albiflorin belonged to the monolayer adsorption under conditions of 308.15–323.15 K and 10–17 MPa.

关键词： Adsorption Supercritical carbon dioxide Paeoniflorin Albiflorin Isotherm model

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Insight into Vulcanization Mechanism of Novel Binary Accelerators for Natural rubber

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Chinese Journal of Polymer Science 2014年第8期32卷 1077-1085页

作者： Shu-yan Yang 贾志欣 Lan Liu Wei-wen Fu de-min Ji Yuan-fang Luo Chemical Industrial Cleaner Production and Green Chemical R&D Center of Guang Dong Universities Dongguan University of Technology College of Materials Science and Engineering South China University of Technology

A novel TU derivative, N-phenyl-N＇-（γ-triethoxysilane）-propyl thiourea （STU）, is prepared and its binary accelerator system is investigated in detail. Compared to the control references, the optimum curing time of Nr compounds with STU is the shortest, indicating a more nucleophilic reaction occurs. The Py-GC/MS results present that the phenyl iso- thiocyanate fragment still remains in the NPUSTU compounds with or without extracting treatment, but no silane segment can be found in the vulcanizate with extracting treatment. Vibrations of C=S, NH and aromatic ring in FTIr experiments and a new methyne carbon peak, as well as the peaks of phenyl group of STU, in the solid state 13C-NMr experiments are found in the Nr/STU vulcanizate with extracting treatment. Moreover, the crosslinking density of vulcanizates with STU evolves to lower level, indicating the sulfur atom of STU does not contribute to the sulfur crosslinking. Therefore, a new vulcanization kinetic mechanism of STU is propounded that the thiourea groups can graft to the rubber main chains as pendant groups by chemical bonds during the vulcanization process, which is in accordance with the experimental observations quite well.

关键词： Vulcanization mechanism Thiourea Natural rubber Binary accelerators.

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Prediction of dissolved gas content in transformer oil based on multi-information fusion

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High Voltage 2024年第3期9卷 685-699页

作者： Tongliang Yang Yun Fang Chengming Zhang Chao Tang dong Hu College of Engineering and Technology Southwest UniversityChongqingChina International R&D Center for New Technologies of Smart Grid and Equipment Southwest UniversityChongqingChina

In order to accurately predict the content and variation trend of dissolved gas in trans-former oil and guide the condition maintenance of power transformers,a combined prediction model based on multi-information fusion is proposed and its effectiveness is *** of all,based on the possibility of pathological and missing historical sample data,a detection and filling method based on variable weight combination samples is ***,the authors propose two *** at the non-linear and non-stationary characteristics of gas content,a univariate decomposition prediction mode HBA-VMd-TCN which based on the Honey Badger algorithm,variational mode decomposition and time convolutional network(TCN)is *** the multi-variate Informer prediction model is established for gas content affected by multiple ***,the cross-entropy theory is used to determine the weight coefficients of the two models,and the multi-information fusion combined prediction model is ***,on the basis of the above,a method to determine the time step and the position information of the transition point adaptively in the process of prediction is proposed to further improve the prediction *** results show that,through a series of simulation experiments of model comparison and transformer anomaly prediction,the accuracy and effectiveness of the combined prediction model are verified.

关键词： content prediction dissolved

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Novel Extracted Piperine as an Activatable Molecular Sensor Toward Viscosity detection in Liquid System

SSRN

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SSrN 2025年

作者： Xu, Lingfeng Huang, Yanrong Zhong, Xuefei Zeng, Lili deng, Xinmin Xie, Yu Li, Haibin Key Laboratory of Special Optoelectronic Artificial Crystal Materials of Jiangxi Province Jinggangshan University Jiangxi Ji’an343009 China State Key Laboratory of Luminescent Materials & Devices College of Materials Science & Engineering South China University of Technology Guangzhou510640 China School of Chemistry and Chemical Engineering Nanchang University Jiangxi Nanchang330036 China School of Modern Agriculture and Forestry Engineering Ji'an Vocational and Technique College Jiangxi Ji'An343009 China R&D Center Jiangxi Guangyuan Chemical Co. Ltd Jiangxi Ji’an331599 China

Micro-environmental viscosity affects microbial metabolism and metabolite diffusion and is closely associated with the deterioration process of liquid system. However, the utilization of viscosity-dependence fluorescent probes are unsatisfactory because these probes are artificially synthesized with large amount of organic solvents consumption. Thus, the development of natural products for monitoring viscosity variations in a micro-scale method has become considerable attempt. Herein, through simple stepwise extraction of Piperine (Pip) from the Piper nigrum L., we developed this natural product as a luminescent tool for detecting liquid viscosity at a molecular level. Based on the incorporation of benzo-dioxolane and piperidinone with rotatable single and double conjugated chemical structure, a typical intramolecular charge transfer system was formed. Pip displayed high signal-to-noise (71-fold) for viscosity with outstanding selectivity, and excellent photostability, adaptability, pH stability was exhibited. With the viscosity sensitivity coefficient (x=0.63) and large Stokes shift in both low viscosity water and high viscous media, the Pip has not only been applied to determine the thickening effects, but also to track the viscosity fluctuation during the liquid spoilage process successfully. We hope that this natural product extraction strategy will be an interesting and general strategy for micro-environmental viscosity detection across the liquid safety inspection. © 2025, The Authors. All rights reserved.

关键词： Charge transfer

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Application of membrane separation technology in postcombustion carbon dioxide capture process

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Frontiers of Chemical Science and engineering 2014年第2期8卷 233-239页

作者： Mo LI Xiaobin JIANG Gaohong HE State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and Technology School of Chemical Engineering Dalian University of Technology Dalian 116024 China

Membrane separation technology is a possible breakthrough in post-combustion carbon dioxide capture process. This review first focuses on the requirements for C02 separation membrane, and then outlines the existing competitive materials, promising preparation methods and processes to achieve desirable CO2 selectivity and permeability. A particular emphasis is addressed on polyimides, poly （ethylene oxide）, mixed-matrix mem- brane, thermally-rearranged polymer, fixed site carrier membrane, ionic liquid membrane and electrodialysis process. The advantages and drawbacks of each of materials and methods are discussed. research threads and methodology of CO2 separation membrane and the key issue in this area are concluded

关键词： membranes carbon dioxide capture separa-tion polymers post-combustion

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Pollutant emission characteristics of rice husk combustion in a vortexing fluidized bed incinerator

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Journal of Environmental Sciences 2013年第2期25卷 335-339页

作者： Feng duan Chiensong Chyang Yucheng Chin Jim Tso School of Metallurgy and Resource Anhui University of Technology Department of Chemical Engineering Chung Yuan Christian University R&D Center for Environmental Technology Chung Yuan Christian University

rice husk with high volatile content was burned in a pilot scale vortexing fluidized bed incinerator. The fluidized bed incinerator was constructed of 6 mm stainless steel with 0.45 m in diameter and 5 m in height. The emission characteristics of CO, NO, and SO2 were studied. The effects of operating parameters, such as primary air flow rate, secondary air flow rate, and excess air ratio on the pollutant emissions were also investigated. The results show that a large proportion of combustion occurs at the bed surface and the freeboard zone. The SO2 concentration in the flue gas decreases with increasing excess air ratio, while the NOx concentration shows reverse trend. The flow rate of secondary air has a significant impact on the CO emission. For a fixed primary air flowrate, CO emission decreases with the secondary air flowrate. For a fixed excess air ratio, CO emission decreases with the ratio of secondary to primary air flow. The minimum CO emission of 72 ppm is attained at the operating condition of 40% excess air ratio and 0.6 partition air ratio. The NOx and SO2 concentrations in the flue gas at this condition are 159 and 36 ppm, which conform to the EPA regulation of Taiwan.

关键词： incineration rice husk vortexing fluidized bed pollutant emission

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A tree-shaped motion strategy for robustly executing robotic assembly tasks

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2010年第12期11卷 986-991页

作者： Yusuke BOTA Hajime MIZUYAMA Akio NOdA Tatsuya NAGATANI Ken-ichi TANAKA Department of Mechanical Engineering and Science Kyoto University Yoshida-Honmachi Advanced Technology R&D Center Mitsubishi Electric Corporation 8-1-1Tsukaguchi-Honmachi

An assembly robot needs to be capable of executing an assembly task robustly under various *** attain this goal,we use a task sequence tree model originally proposed for manual *** model regards an assembly task under uncertainties as a transformation of the contact state *** concept may contain several contact states with probabilities but these are transformed through a series of task elements into the contact state concept having only the goal state at the *** transformed contact state concept can be classified according to the terminal condition of each task ***,the whole assembly task can be designed as a tree-shaped contingent strategy called a task sequence *** paper proposes a systematic approach for reconfiguring a task sequence tree model for application to a robotic assembly *** addition,by taking a 2d peg-in-hole insertion task to be performed by a robot equipped with a force sensor as an example,we confirm that the proposed approach can provide a robust motion strategy for the task and that the robot can actually execute the task robustly under bounded uncertainty according to the strategy.

关键词： Active compliant motion Contact states Motion strategy robotic assembly Task sequence tree

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