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Effect of carbon dioxide on oxy-fuel combustion of hydrogen sulfide:An experimental and kinetic modeling

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Chinese Journal of Chemical Engineering 2023年第7期59卷 105-117页

作者： Xun Tao Fan Zhou Xinlei Yu Songling Guo Yunfei Gao Lu Ding Guangsuo Yu Zhenghua Dai Fuchen Wang Shanghai Engineering Research center of Coal Gasification East China University of Science and TechnologyShanghai 200237China

CO_(2) is an important component in the acid gas and it is necessary to study the effect of CO_(2) presence on the oxy-fuel combustion of H_(2)S with particular focus on the formation of carbonyl sulfide(COS).The oxyfuel combustion of acid gas was conducted in a coaxial jet double channel *** distribution of flame temperature and products under stoichiometric condition along axial(R=0.0)and radial at about 3.0 mm(R=0.75)were analyzed,*** Chemkin-Pro software was used to analyze the rate of production(ROP)for gas products and the reaction pathway of acid gas *** experimental and simulation results showed that acid gas combustion experienced the H2S chemical decomposition,H_(2)S oxidation and accompanied by H_(2) *** CO_(2) presence reduced the peak flame temperature and triggered the formation of COS in the flame *** formation at R=0.0 was mainly through the reaction of CO_(2) and CO with sulfur species,whereas at R=0.75 it was through the reaction of CO with sulfur *** ROP results indicated that H_(2) was mainly from H_(2)O decomposition in the H_(2)S oxidation stage,and COS was formed by the reaction of CO_(2) with H_(2)*** and other detailed analysis further revealed the role of H,OH and SH radicals in each stage of H_(2)S *** study revealed the COS formation mechanisms with CO_(2) presence in the oxy-fuel combustion of H_(2)S and could offer important insights for pollutant control.

关键词： Carbon dioxide Oxy-fuel combustion of H_(2)S Reaction pathway Kinetics Oxidation

Flexible,durable,and anti-fouling nanocellulose-based membrane functionalized by block copolymer with ultra-high flux and efficiency for oil-in-water emulsions separation

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Nano Research 2023年第4期16卷 5665-5675页

作者： Jianfei Wu Yuxuan Su Ziwei Cui Yang Yu Jiafu Qu Jundie Hu Yahui Cai Jianzhang Li Dan Tian Qichun Zhang Co-Innovation center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China School of Materials science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Department of Materials science and Engineering&center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong Kong 999077China

The clearwater obtained from stabilized oily wastewater has become a worldwide ***,the area of oil/water emulsion separation materials have accomplished great progress,but still faces the enormous problems of low flux,poor stability,and pollution ***(cellulose nanocrystals(CNC))with the advantages of hydrophilicity,ecofriendliness,and regeneration are ideal materials for the construction of separation *** this paper,a flexible,antifouling,and durable nanocellulose-based membrane functionalized by block copolymer(poly(N-isopropylacrylamide)-b-poly(N,Ndimethylaminoethyl methacrylate))is prepared via chemical modification and self-assembly,showing high separation efficiency(above 99.6%)for stabilized oil-in-water emulsions,excellent anti-fouling and cycling stability,high-temperature resistance,and acid and alkali *** importantly,the composite membrane has ultra-high flux in separating oil-in-water emulsions(29,003 L·m^(−2)·h^(−1)·bar^(−1))and oil/water mixture(51,444 L·m^(−2)·h^(−1)·bar^(−1)),which ensures high separation *** its durability,easy scale-up,and green regeneration,we envision this biomass-derived membrane will be an alternative to the existing commercial filter membrane in environmental remediation.

关键词： nanocellulose-based membrane oil/water emulsions separation ultra-high flux good durability anti-fouling property

Influence of relative positions between RF coil and crucible on sapphire crystals by edge-defined film-fed growth(EFG) technique

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Journal of Central South University 2015年第10期22卷 3731-3737页

作者：吴小凤姚正军裴广庆罗西希徐尚君林玉划杨红勤 College of Material science and Technology Nanjing University of Aeronautics and Astronautics Research center Unionlight Technology Company Limited

To obtain the stable temperature field required for growing sapphire crystals, the influence of relative positions between RF coil and crucible on the performances of sapphires produced by edge-defined film-fed growth（EFG） technique was investigated. For comparison, the crucible was located at the top（case A） and the middle（case B） of the RF coil, respectively. Furthermore, the lattice integrities were studied by the double-crystal X-ray diffraction, and the dislocations were observed under the optical microscope and atomic force microscope after corroding in molten KOH at 390 ℃. The crystals in case B exhibit better lattice integrity with smaller full width at half maximum of 29.13 rad·s, while the value in case A is 45.17 rad·s. The morphologies of dislocation etch pits in both cases show typical triangular symmetry with smooth surfaces. However, the dislocation density of 2.8×104 cm-2 in case B is only half of that in case A, and the distribution is more uniform, compared to the U-shaper in case A.

关键词： sapphire single-crystal edge-defined film-fed growth two relative positions lattice integrity dislocations

Stereocomplexation and Mechanical Properties of Polylactide-bpoly(propylene glycol)-b-polylactide Blend Films: Effects of Polylactide Block Length and Blend Ratio

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Chinese Journal of Polymer science 2017年第11期35卷 1391-1401页

作者： Dutchanee Pholharn Onanong Cheerarot Yodthong Baimark Biodegradable Polymers Research Unit Department of Chemistry and Center of Excellence for Innovation in ChemistryFaculty of Science Mahasarakham University

In the present work, poly（propylene glycol）（PPG） was block copolymerized to form polylactide-poly（propylene glycol）-polylactide （PL-PPG-PL） triblock copolymers for preparing flexible stereocomplex PL （scPL） blend films. The scPL blend films were prepared by solution blending of poly（L-lactide）-PPG-poly（L-lactide）（PLL-PPG-PLL） and poly（D-lactide）- PPG-poly（D-lactide）（PDL-PPG-PDL） triblock copolymers before film casting. The influences of PL end-block lengths （2 ×10^4 and 4×10^4 g/tool） and blend ratios （75/25, 50/50 and 25/75 W/W） on the stereocomplexation and mechanical properties of the blend films were evaluated. From DSC and WAXD results, the 50/50 blend films had complete stereocomplexation. Phase separation between the scPL and PPG phases was not observed from their SEM images. The tensile stress and elongation at break increased with the sterecomplex crystallinities and PL end-block lengths. The PPG middle-blocks enhanced elongation at break of the scPL films. The results showed that the PL-PPG-PL triblock structures did not affect stereocomplexation of the PLL/PDL block blending. In conclusion, the phase compatibility and flexibility of the scPL films were improved by PPG block copolymerization.

关键词： Stereocomplex Polylactide Poly(propylene glycol) Block copolymers Mechanical properties

Robust online temperature estimation of a membrane-wall gasifier

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Chinese Journal of Chemical Engineering 2020年第2期28卷 556-565页

作者： Jianliang Xu Qinfeng Liang Zhenghua Dai Xiaolei Guo Haifeng Liu Xin Gong Shanghai Engineering Research center of Coal Gasification East China University of Science and TechnologyShanghai 200237China

The gasifier temperature is a key parameter in the operation of a slag-tapping entrained-flow ***,there is no effective method for measuring the operating temperature of a membrane-wall-lined *** this study,a novel robust method for estimation of the online temperature was developed for a membrane-wall gasifier and applied in an industrial SE *** industrial test results show that the method can estimate the gasifier temperature within 0.04 s,and its value can be reliably *** on the combination of bench-scale gasifier validation,commercial-scale gasifier operation experience,and the comparison of different simulation methods,the proposed method is accurate and reliable for measuring the operating temperature of a membrane-wall-lined gasifier.

关键词： Coal Gasification Temperature estimation Slag Membrane wall

Improved Properties in Relation to Fine Precipitate Microstructures Tailored by Combinatorial Processes in an Al-Cu-Mg-Si Alloy

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Acta Metallurgica Sinica(English Letters) 2020年第11期33卷 1527-1534页

作者： Fengjiao Niu Jianghua Chen Cuilan Wu Jing Wu Xiandong Xu Pan Xie Xiongwei Yu center for High-Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China

The 2xxx series Al alloys have been widely used in aerospace industry owing to their high strength,good plasticity and superior *** ensure a good control of shape,the quenched alloy sheets require a small pre-deformation before artificial ***,this pre-deformation considerably deteriorates the mechanical strength of the Al-3.0 Cu-1.8 Mg-0.5 Si(wt%)alloys due to the formation of unfavorable large-sized precipitates at *** tackle this issue,we designed a pre-aging process prior to the *** thermal-mechanical treatment,involving pre-aging,pre-deformation and subsequent aging,markedly enhanced the ultimate tensile strength up to 521 MPa compared to that(448 MPa)of the alloy without *** characterization revealed that the fine precipitates(~2 nm)with a uniform dispersion were promoted within the Al matrix,which in turn partly suppressed the formation of the unfavorable large-sized precipitate(~100 nm).Our findings provide a new clue for designing stronger Al alloys with age-hardenability.

关键词： Aluminum alloys Thermo-mechanical treatment Precipitation Age-hardenability

PVP/PAN-derived porous carbon fiber for zinc-ion hybrid supercapacitors

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Rare Metals 2024年第7期43卷 3066-3073页

作者： Shu-Hua Yang Wen-Qing Fu Yan-Wei Cui Bing-Qiang Cao Materials center for Energy and Photoelectrochemical Conversion School of Material Science and EngineeringUniversity of JinanJinan 250022China

Porous carbon fibers are promising cathodes for zinc-ion hybrid supercapacitors(ZHSs)owing to their abundant active sites,great conductivity,and stable physical and chemical ***,designing a proper preparation technique to regulate the microstructure of carbon fibers still remains a great ***,a poly vinylpyrrolidone/po-lyacry lonitrile(PVP/PAN)-derived porous carbon fiber is developed via the PVP/PAN blend electrospinning and hydrothermal selective PVP removal *** hydrothermal selective PVP removal strategy can effectively avoid a cross-linking between PVP and PAN during the traditional stabilization at air *** PVP/PAN-derived porous carbon fiber,the sufficient micropores provide abundant space for the Zn^(2+)storage,whereas the proper mesopores contribute to the fast ion *** hierarchical porous structures endow ZHSs with high specific capacity and high-rate *** ZHS assembled with the optimal PVP/PAN-derived porous carbon fiber(PVP-PANC-0.8)displays an outstanding specific capacity of 208 mAh·g^(-1),high rate capability(49.5%)from 0.5 to 5 A·g^(-1),and 72.25%capacity retention after 10,000 cycles at 0.5 A·g^(-1).

关键词： Zinc-ion hybrid supercapacitors Porous carbon fibers Hierarchical porous structures Electrospinning

Human induced pluripotent stem cell based in vitro models of the blood-brain barrier： the future standard？

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Neural Regeneration Research 2017年第10期12卷 1607-1609页

作者： Winfried Neuhaus AIT–Austrian Institute of Technology GmbH Competence Center Health and BioresourcesUnit Molecular DiagnosticsMuthgasse 111190 ViennaAustria

There is an urgent and tremendous need for human dis- ease models in drug development in order to improve pre- clinical predictability. In the case of brain disorders drugs have to cross the blood-brain barrier （BBB） to enter the central nervous system （CNS）. It was estimated that more than 95% of the drugs cannot cross the BBB.

关键词： Human induced pluripotent stem cell based in vitro models of the blood-brain barrier:the future standard BBB

B-COPNA resin formation from ethylene tar light fractions:Process development and mechanical exploration by molecular simulation

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Chinese Journal of Chemical Engineering 2024年第6期70卷 118-129页

作者： Hongyan Shen Lingrui Cui Xingguo Wei Yuanqin Zhang Lian Cen Jun Xu Fahai Cao Engineering Research center of Large Scale Reactor East China University of Science and TechnologyShanghai 200237China

An efficient utilization strategy of ethylene tar(ET),the main by-product of the ethylene cracking unit,is urgently required to meet demands for modern petrochemical *** the other hand,condensed polynuclear aromatic resin of moderate condensation degree(B-COPNA)is a widely used carbon material due to its superb processability,the production of which is,however,seriously limited by the high cost of raw *** such context,an interesting strategy was proposed in this study for producing B-COPNA resin using crosslinked light fractions of ethylene tar(ETLF,boiling pointmolecular simulation.1,4-Benzenedimethanol(PXG)was first selected as the crosslinking agent according to the findings of molecular *** effects of operating conditions,including reactions temperature,crosslinking agent,and catalyst content on the softening point and yield of B-COPNA resin products were then investigated to optimize the *** reaction mechanism of resin production was studied by analyzing the molecular structure and transition state of ETLF and crosslinking *** was shown that PXG exhibited a superior capacity of withdrawing electrons and a higher electrophilic reactivity than other crosslinking *** addition to the highest yield and greatest heat properties,PXG-prepared resin contained the most condensed *** corresponding optimized conditions of resin preparation were 180℃,1:1.9(PXG:ETLF),and 3%(mass)of catalyst content with a resin yield of 78.57%.It was the electrophilic substitution reaction that occurred between the ETLF and crosslinking agent molecules that were responsible for the resin formation,according to the experimental characterization and molecular ***,it was confirmed that the proposed strategy and demonstrated process can achieve a clean and high value-added utilization of ETLF via B-COPNA resin preparation,bringing huge economic value to the current petrochemical industry.

关键词： Ethylene tar Crosslinking COPNA resin molecular simulation Transient state