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Chinese Journal of Chemical engineering 2019年第4期27卷 905-911页

作者： Kangning Xiong Shuai Shen Youchang Wang Yun Chen state key laboratory of pulp and paper engineering Department of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China Department of Chemical & Biomolecular engineering North Carolina State University Raleigh NC 27695 USA

In this work, liquid–liquid equilibria(LLE) data for the ternary system methyl tert-butyl ketone(MTBK)+ o, m,p-benzenediol + water were investigated at 333.2 K, 343.2 K and 353.2 K under 101.3 kPa. The performance of MTBK to extract o, m, p-benzenediol from wastewaters was estimated by partition coefficients and separation factors. The Hand and Bachman equations were both applied to check the reliability of the experimental LLE data. Furthermore, the Non-Random Two-Liquid(NRTL) and Universal Quasi Chemical(UNIQUAC) models were applied to correlate the measured LLE data. The results showed a good agreement with the determined ternary LLE data with the root-mean-square error(RMSE) values below 0.71%. MTBK was proved to be a promising extracting agent in extracting benzenediols from effluents.

关键词： Liquid–liquid equilibrium Methyl tert-butyl ketone Benzenediol NRTL model UNIQUAC model

Novel efficient procedure for biodiesel synthesis from waste oils with high acid value using 1-sulfobutyl-3-methylimidazolium hydrosulfate ionic liquid as the catalyst

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Chinese Journal of Chemical engineering 2017年第10期25卷 1519-1523页

作者： Shuanglan Hu Ying Li Wenyong Lou School of Biosciences and Bioengineering South China University of Technology Guangzhou 510640 China School of Food Sciences and engineering South China University of Technology Guangzhou 510640 China state key laboratory of pulp and paper engineering South China University of Technology Guangzhou 510840 China

Preparation of biodiesel from waste oils containing 72% of free fatty acids catalyzed by a novel Br?nsted acidic ionic liquid 1-sulfobutyl-3-methylimidazolium hydrosulfate([BHSO_3MIM][HSO_4]) was systematically *** optimum molar ratio of methanol to waste oils,catalyst amount,reaction temperature and reaction time were 8/1,10%(based on the mass of waste oils),140°C and 6 h,respectively,under which the obtained yield of biodiesel reached 94.9%.Also,[BHSO_3MIM][HSO_4] as a catalyst still retained around 97% of its original catalytic activity after successive re-use of 5 batches(6 h per batch),showing the excellent operational ***,the acidic IL [BHSO_3MIM][HSO_4] was able to ef ficiently catalyze conversions of waste oils with different amounts of FFAs(free fatty acids) into biodiesel,and showed tremendous application ***,an ef ficient and environmentally friendly catalyst is provided for the synthesis of biodiesel from waste oils with high acid value.

关键词： 1-Sulfobutyl-3-methylimidazolium hydrosulfate Biodiesel Waste oils with high acid value Catalyst

Preparation of Organic Nanoacid Catalyst for Urethane Formation

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Chinese Journal of Chemical Physics 2017年第3期30卷 339-342,I0002页

作者：陈梓健钟伟强汤栋霖张广照华南理工大学材料科学与工程学院广州510640

Metal-free catalysts are preferred during these days in organic synthesis or in polymeriza- tions. Sulfonic acid is reported to be efficient in catalyzing reactions between isocyanates and alcohols. In this work, synthesis of sulfonic acid immobilized organic nanoparticles （nanoacid） and its application in catalyzing urethane formation, are elaborated. The nanoacid can be simply prepared by miniemulsion polymerization with a reactive surfacrant, namely sodium 4-（（perfluoronon-8-en-l-yl）oxy）benzenesulfonate, followed by an acidification. From the images of scanning electron microscope, the nanoacid obtained is found to be narrowly dispersed and the average diameter is around 90 nm. The measured sulfur content is 0.5%, from which the content of sulfonic acid in the nanoparticles is calculated to be 0.16 mmol/g. When catalyzing urethane formation based on hexamethylene diisocyanate and n-butanol, the nanoacid catalyst exhibits considerable efficiency.

关键词： Nanoacid Catalysis Urethane Miniemulsion

Synthesis, isolation and characterization of methyl levulinate from cellulose catalyzed by extremely low concentration acid

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Journal of Energy Chemistry 2013年第6期22卷 895-901页

作者： Hui Li Lincai Peng Lu Lin Keli Chen Heng Zhang Faculty of Chemical engineering Kunming University of Science and Technology state key laboratory of pulp and paper engineering South China University of Technology School of Energy Research Xiamen University

A direct synthesis of methyl levulinate from cellulose alcoholysis in methanol medium under mild condition(180 210 C)catalyzed by extremely low concentration sulfuric acid(0.01 mol/L)and the product isolation were developed in this *** of different process variables towards the catalytic performance were performed as a function of reaction *** results indicated that sulfuric acid concentration,temperature and initial cellulose concentration had significant effects on the synthesis of methyl *** optimized yield of around 50%was achieved at 210 C for 120 min with sulfuric acid concentration of 0.01 mol/L and initial cellulose concentration below 100 g/*** resulting product mixture was isolated by a distillation technique that combines an atmospheric distillation with a vacuum distillation where n-dodecane was added to help distill the heavy *** light fraction including mainly methanol could be reused as the reaction medium without any substantial change in the yield of methyl *** chemical composition and structural of lower heavy fraction were characterized by GC/MS,FTIR,1H-NMR and13C-NMR *** levulinate was found to be a major ingredient of lower heavy fraction with the content over 96%.This pathway is efficient,environmentally benign and economical for the production of pure levulinate esters from cellulose.

关键词： cellulose methyl levulinate extremely low acid catalysis alcoholysis isolation

Measurement and correlation of phase equilibrium data of the mixtures consisting of water, resorcinol, mesityl oxide at different temperatures

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Chinese Journal of Chemical engineering 2018年第12期26卷 2573-2580页

作者： Youchang Wang Shaoming Zhou Jinhui Tang Yun Chen Libo Li key laboratory of Heat Transfer Enhancement and Energy Conservation of Ministry of Education School of Chemistry and Chemical Engineering South China University of Technology

Liquid–liquid equilibrium(LLE) data were measured for the ternary system of water + resorcinol + mesityl oxide under atmospheric pressure at temperatures of(298.2, 323.2, 333.2, 343.2 and 353.2) K. The reliability of the experimental data was verified by the Hand and Bachman equations. The distribution coefficient and selectivity were calculated from the experimental LLE data, which showed high efficiency of mesityl oxide extracting resorcinol from the aqueous solution. The NRTL and UNIQUAC models were employed to fit the measured experimental LLE data and yield corresponding binary interaction parameters.

关键词： Liquid-liquid equilibrium Mesityl oxide Resorcinol NRTL UNIQUAC

Simultaneous anaerobic-aerobic biodegradation of halogenated phenolic compound under oxygen-limited conditions

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Journal of Environmental Sciences 2005年第5期17卷 873-875页

作者： CHEN Yuan-cai LAN Hui-xia ZHAN Huai-yu FU Shi-yu state key laboratory of pulp and paper engineering South China University of Technology Guangzhou 510641 China laboratory of Cellulose and Liguocellulosics Chemistry Chinese Academy of Sciences Guangzhou 510650 China

The successful application of co-immobilized aerobic-anaerobic biomass under limited aeration in wastewater treatment systems would eliminate the problems associated with the intermediates mono-chlorophenol（MCP） and di-chlorophenol（DCP） accumulations. With low initial pentachlorophenol（PCP） concentration, all PCP could be completely removed under oxygen-limited strict anaerobic conditions, and the removal efficiencies with different initial headspace oxygen percentage（IHOP） were not obviously different from each other. While at high initial PCP concentration, under strictly anaerobic conditions PCP and their intermediates were clearly higher than that under other conditions, and produced obvious accumulation, the highest PCP reduction was achieved by the system receiving 30 IHOP, oxygen-limited system also exhibited lower residual TOC concentration and lower concentration of metabolic intermediates MCP and DCP. These results suggested that under strictly anaerobic condition the reductive dechlorination of low chlorinated compounds became rate limiting in the reductive dechlorination pathway, less chlorinated compounds be more amenable to aerobic degradation, and the aerobes of outer layers could function under limited oxygen. The co-immobilized aerobic-anaerobic biomass for methanogenesis under limited-aeration for chlorophenol degradation might be an attractive and efficient alternative for the sequential anaerobic/aerobic system to achieve mineralization of a broad range of recalcitrance highly chlorinated organics and low final TOC concentrations.

关键词： PCP oxygen-limited immobilized cellr

Cultivation and characters of aerobic granules for pentachlorophenol(PCP) degradation under microaerobic condition

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Journal of Environmental Sciences 2005年第3期17卷 506-510页

作者： LANHui-xia CHENYuan-cai CHENZhong-hao CHENRong statekeylaboratoryofpulpandPalterengineering SouthChinaUniversityofTechnologyGuangzhou510640China laboratoryofCelluloseandLignocellulosicsChemistry GuangzhouInstituteofChemistryChineseAcademyofSciencesGuan

Cultivation of aerobic granular sludge for pentachlorophenol(PCP) degradation under microaerobic condition(DO concentration was controlled at 0.2—0.7 mg/L) was studied in this paper. Anaerobic granules were selected as inoculum. The changes of appearance were observed and the variations of SVI, VSS/TSS, PN/PS and the size of sludge were measured during cultivating. The capabilities for degradation of PCP, AOX and COD_ Cr were also studied. Observations on mature granules were carried out by scanning electron microscope, and the results indicated bacillus was dominant on the surface of granules while in the inner of granules both bacillus and coccus were the dominant microorganisms. K, Na, Fe, Ca, Mg, Ni, Co, Mn, Cu and Zn were detected in the granules by element analysis.

关键词： aerobic granular sludge pentachlorophenol microaerobic condition

Platinum-based ternary catalysts for the electrooxidation of ethanol

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Particuology 2021年第5期19卷 169-186页

作者： Guangxing Yang Qiao Zhang Hao Yu Feng Peng state key laboratory of pulp and paper engineering South China University of TechnologyGuangzhou 510641PR China School of Chemistry and Chemical engineering South China University of TechnologyGuangzhou 510641PR China School of Chemistry and Chemical engineering Guangzhou UniversityGuangzhou 510006PR China

Direct ethanol fuel cell(DEFC)as a promising device for converting chemical energy to electricity has been paid ever-increasing ***,the slow kinetics of ethanol electrooxidation at an anode hinders the application of *** Pt is the best catalyst among all the pure metal catalysts,it still has a relatively poor ability to break the Csingle bondC bond,is deactivated by the accumulated CO_(ad) intermediates,and undergoes unwanted desired structure change over long-term *** recent years,the addition of other metals to form binary,ternary,and quaternary catalysts have significantly improved electroactivity and *** catalysts can have numerous element combinations and complicated architectures and,therefore,have been the subject of considerable *** this review,most of the reported ternary catalysts will be summarized and categorized according to their structure while discussing the essence of the role of each component.

关键词： Direct ethanol fuel cell Ethanol oxidation reaction Ternary catalyst Composition-reactivity relationship

Polyisocyanuratoesters:Renewable Linear Polyesters with High Flame Retardancy

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Journal of Renewable Materials 2018年第6期6卷 584-590页

作者： Zijian Chen Rui Hou Jianbing Cheng Fengjie Fang Donglin Tang Guangzhao Zhang School of Materials Science and engineering South China University of Technology381 Wushan RoadTianhe DistrictGuangzhou 510640P.R.China

Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential,which benefits from the development of biobased ammonia and ecological sanitation *** is an ideal feedstock for chemical industry and developing new urea-based polymer materials can take advantage of the urea *** this work,a class of renewable linear polyesters,namely polyisocyanuratoesters(PICEs)were synthesized from a urea-based monomer bis(2-carbomethoxyethyl)isocyanurate and biobased aliphatic *** with conventional aliphatic polyesters,PICEs containing isocyanurate rings in the polymer chain backbone exhibit outstanding flame retardancy that both PICE-4(the number‘4’refers to the number of methylene in diols,e.g.4 for butylene and 6 for hexylene)and PICE-6 have high limiting oxygen index values over 30%.In the UL 94 tests,PICE-6 reaches V-1 rating;while V-2 is found for *** PICEs exhibit similar pyrolysis behavior that the temperatures of 5%weight loss are around 320°*** are found to have glass transition among 20°C-45°*** crystallization behavior is observed without annealing except for PICE-10,which can crystallize even at room temperature.

关键词： Urea isocyanurate ring aliphatic diol linear polyester flame retardancy

Carbon-based nanoarrays embedded with Ce-doped ultrasmall Co_(2)P nanoparticles enable efficient electrooxidation of 5-hydroxymethylfurfural coupled with hydrogen production

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Science China Chemistry 2023年第7期66卷 2141-2152页

作者： Shangfang Xie Hongchuan Fu Liyu Chen Yingwei Li Kui Shen Guangdong Provincial key laboratory of Fuel Cell Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China

The electrooxidation of 5-hydroxymethylfurfural(HMFOR)not only offers a green route to attain high-value 2,5-furandicarboxylic acid(FDCA)from biomass,but also is considered as a promising approach to replace the kinetically sluggish OER for future hydrogen ***,we report the construction and structural optimization of Ce-doped ultrasmall Co_(2)P nanoparticles(NPs)in carbon-based nanoarrays to boost HER-coupled *** demonstrate that the electronic structure of Co-based electrocatalysts can be positively regulated by Ce doping and the optimized Ce-Co_(2)P-based electrocatalyst only require a low voltage of 1.20 V *** to achieve 10 m A cm^(-2)for HMFOR with an excellent FDCA Faraday efficiency(FEFDCA)of 98.5%,which are superior to its Ce-free counterpart(1.29 V ***;FEFDCA=83.9%).When being assembled into a HERcoupled HMFOR system,this bifunctional electrocatalyst can achieve 50 m A cm^(-2)with an ultralow voltage of 1.46 V,which is reduced by 210 m Vas compared with that of its Ce-free counterpart(1.67 V).Quasi-operando experiments and DFTcalculations further reveal the significant roles of Ce doping in promoting the charge transfer between active sites and HMF,and reducing the free energy barrier of intermediate(^(*)HMFCA)*** study provides new insights into the underlying mechanisms of Ce doping into metal phosphides for boosting HER-coupled HMFOR,developing a facile methodology to construct efficient electrocatalysts for energy storage/conversion systems.

关键词： ultrasmall Co_(2)P nanoparticles Ce doping nanosheet arrays 5-hydroxymethylfurfural electrooxidation hydrogen evolution reaction