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Molecular characterization of polar heteroatom species in oilsands bitumen-derived vacuum residue fractions by Fourier transform ion cyclotron resonance mass spectrometry

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Petroleum Science 2019年第5期16卷 1196-1207页

作者： Fang Zheng Warren chung Eusebio Palmisano Dahai Dong Quan Shi Zhiming Xu Keng h.chung State Key Laboratory of heavy Oil Processing China University of PetroleumBeijing 102249China Well Resources Inc EdmontonCanada Cenovus Energy Inc CalgaryCanada Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China

A Canadian in situ oilsands bitumen-derived vacuum residue(VR)was subjected to supercritical fluid extraction and fractionation(SFEF)into 13 extractable fractions and an unextractable end-cut and characterized by positive-and negative-ion electrospray ionization(ESI)Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS).The results of negative-ion ESI FT-ICR MS showed that the N1 class species was the most abundant and the multifunctional group compounds,such as N1 O1,N1 O2,N1 S1,N1 S2,and N2 class species became abundant as the SFEF fraction became *** positive-ion ESI mode,the relative abundance of N1 class species decreased gradually in the heavy SFEF fractions while that of multifunctional group compounds *** relative abundance of N4 V1 O1 increased dramatically in heavy fractions and the *** distributions of polar heteroatom species of VR derived from oilsands bitumen were similar with those of VR derived from the Venezuela Orinoco extra heavy oil.

关键词： Molecular characterization Canadian oilsands bitumen SFEF ESI FT-ICR MS

Characterization of Ultra Fine Solids(BS) in Athabasca Bitumen

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Chinese Journal of Structural Chemistry 2004年第7期23卷 751-754页

作者：李再峰 Judy KUNG 涂云 Luba S.Kotlyar Keng h.chung College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyShandong 266042China National Research Council of Canada Institute for Chemical Process andEnvironmental TechnologyMontreal Road CampusOttawaOntarioCanada K1A 0R6 Syncrude Canada Ltd.Edmonton Research Centre9421-17th Avenue EdmontonAlberta Canada T6N 1H4

The ultra fine (<200 nm) inorganic solids (BS) were separated from bitumen which was washed by toluene and centrifugated at 2000 rpm. The result of PAS FTIR and image of TEM showed that the structure of BS particles w... 详细信息

The ultra fine (hich was washed by toluene and centrifugated at 2000 rpm. The result of PAS FTIR and image of TEM showed that the structure of BS particles was smiliar to that of kaolinite clay. On the surface of BS, both toluene insoluble organic matter and structural Oh group are detected at the same time. The surface characteristics imparted a bi-wettable nature to the BS. As a result, the BS is able to stabilize fine water emulsion in the bitumen phase. The organic matter associated with BS is a possible factor of the fouling on catalyst and equipment.

关键词： ultra fine solids characterization bitumen

hydrodesulfurization and hydrodenitrogenation Kinetics of a heavy Gas Oil over NiMo/Al_2O_3 Catalysts

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高校化学工程学报 2005年第6期19卷 762-766页

作者： DUAN Ai-jun XU Chun-ming LIN Shi-xiong chung Keng h State Key Laboratory of heavy Oil Processing University of Petroleum Beijing 102249 China Syncrude Canada Ltd. 9421 - 17 Avenue Edmonton Alberta Canada T6N IH4

The kinetics of Athabasca bitumen derived heavy gas oil over NiMo/Al2O3 catalysts were studied in a JQ-II high-pressure microscale hydrotreator unit under different operation conditions, including temperature, pressure, h/O ratio and LhSV. The multi-parameter models of hydrodesulfurization and hydrodenitrogenation were proposed. The model parameters verify that the hDS and hDN reactions follow 1.5-order and 1.6-order kinetic rules, respectively. The kinetic activation energies of hDN and hDS over Com, hom1 and hom2 show that homemade catalysts exhibit higher activities in hDN than commercial catalyst. Using the multi-parameter kinetic model to predict the contents of sulfur and nitrogen in products is in good agreement with the experimental data.

关键词：加氢脱硫加氢脱氮动力学模型重气油 NiMo/Al2O3催化剂

Properties Correlations and Characterization of Athabasca Oil Sands-derived Synthetic Crude Oil

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Petroleum Science 2007年第3期4卷 84-90页

作者： Wang Jun Zhao Suoqi Xu Chunming chung Keng h. State Key Laboratory of heavy Oil Processing China University of Petroleum Beijing 102249 China Petrochemical Institute of PetroChina Beijing 10083 China EnergyINet Calgary Alberta Canada

Narrow fractions of Athabasca oil sands-derived synthetic crude oil （SCO） from Canada were obtained by distillation at 20 ℃ to 500 ℃ and characterized. The yield and properties, such as density, refractive index, viscosity, freezing point, sulfur and nitrogen content and UOP K-index, were correlated as a function of boiling temperature （Tb）. The properties of naphtha fractions, jet fuel and diesel fractions could be predicted accurately with the correlations, which are useful for process design considerations, such as optimizing operating conditions of refinery processing units. The other key properties and characteristics of naphtha fractions, jet fuel, diesel and vacuum gas oil were also determined.

关键词： SCO properties correlation characterization

Influence of Ti^(4+) doping on hyperfine field parameters of Mg_(0.95)Mn_(0.05)Fe_(2-2x)Ti_(2x)O_4(0≤x≤0.7)

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Journal of Central South University 2010年第6期17卷 1139-1143页

作者： KUMAR S PRAKASh R ALIMUDDIN ChOI h K KOO B h SONG J I chung h JEONG h LEE C G School of Nano and Advanced Materials Engineering Changwon National UniversityChangwon 641773Korea Department of Mechanical Engineering Changwon National UniversityChangwon 641773Korea Department of Applied Physics Aligarh Muslim UniversityAligarh 202002India Department of Precision & Mechanical Engineering and BK21 Eco-Friendly heat & Cooling Energy Mechanical Research Team Gyeongsang National U niversityTongyeong 650160Korea

The mixed spinel ferrite system Mg0.95Mn0.05Fe2-2xTizxO4 （0 ≤x ≤ 0.7） was synthesized by the conventional solid-state reaction technique. The effect of Ti^4＋ doping was studied by using the Moessbauer spectroscopy measurements at room temperature. From the analysis of the Moessbauer spectra, it is observed that s-electron density, electric field gradient （EFG）, quadrupole coupling constant （QCC） and the net hyperfine magnetic fields acting on the Moessbauer nuclei-FeA^3＋ and FeB^3＋ change with the increase of Ti^4＋ doping in Mg0.95Mn0.05Fe2O4. The hyperfine magnetic field decreases with the increase of Ti^4＋ doping.

关键词： spinel ferrite Moessbauer spectroscopy hyperfine magnetic field isomer shift Ti^4+ doping

Impedance spectroscopy study on Mn_(1+x)Fe_(2-2x)Ti_xO_4(0≤x≤0.5) ferrites

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Journal of Central South University 2010年第6期17卷 1133-1138页

作者： KUMAR S BATOO K M PRAKASh R ChOI h K KOO B h SONG J I chung h JEONG h LEE C G School of Nano and Advanced Materials Engineering Changwon National UniversityChangwon 641773Korea King Abdullah Institute for Nanotechnology King Saud UniversityRiyadh 11451Saudi Arabia Department of Mechanical Engineering Changwon National UniversityChangwon 641773Korea Department of Precision & Mechanical Engineering and BK21 Eco-Friendly heat & Cold Energy Mechanical Research Team Gyeongsang National U niversityTongyeong 650160Korea

The complex impedance spectroscopy and surface morphology of Mn1+xFe2-2xTixO4(0≤x≤0.5) system,prepared using a conventional solid state reaction technique,were *** impedance spectroscopy measurements were carried out at room temperature in the frequency range of 42-5 *** electrical processes in the samples were modeled in the form of an equivalent circuit made up of a combination of two parallel RC circuits attributed to grain and grain *** DC conductivity obtained by extrapolation of AC data using impedance spectroscopy and four-probe method increases at 10% doping of Ti *** energy-dispersive X-ray(EDX) pattern confirmed the homogeneous mixing of the Mn,Fe,Ti and O atoms in pure and doped ferrite samples.

关键词： spinel ferrite magnetic properties impedance spectroscopy Ti4+ ions doping

A multi-objective pigeon inspired optimization algorithm for fuzzy production scheduling problem considering mould maintenance

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Science China(Information Sciences) 2019年第7期62卷 15-32页

作者： Xiaoyue FU Felix T.S.ChAN Ben NIU Nick S.h.chung Ting QU Department of Industrial and Systems Engineering The Hong Kong Polytechnic University College of Management Shenzhen University School of Electrical and Information Engineering Jinan University

The fuzzy production scheduling problem considering mould maintenance(FPSP-MM) is studied. The processing time and the maintenance time are represented by triangular fuzzy numbers. When tasks are executed based on the sequence provided by the fuzzy schedule, the real duration of each task needs to be known so the posteriori solution with deterministic processing times can be obtained. Therefore, the concept of the schedule robustness needs to be considered for the fuzzy problem. The robustness is considered as the optimization objective except for the fuzzy makespan in this research. To optimize these two objective functions, a multi-objective pigeon inspired optimization(MOPIO) algorithm is developed. To extend the pigeon inspired optimization(PIO) algorithm from the single-objective case to the multi-objective case, nondominated solutions are used as candidates for the leader pigeon designation and a special crowding distance is used to ensure a good distribution of solutions in both the objective space and the corresponding decision space. Furthermore, an index-based ring topology is used to manage the convergence speed. Numerical experiments on a variety of simulated scenarios show the excellent efficiency and effectiveness of the proposed MOPIO algorithm by comparing it with other algorithms.

关键词： fuzzy production scheduling mould maintenance pigeon inspired optimization multi-objective

Petroleum heteroatom compounds in various commercial delayed coking liquids： characterized by FT-ICR MS and GC techniques

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Science China Chemistry 2017年第2期60卷 284-292页

作者： Miao hu Chuang Guo Linzhou Zhang Suoqi Zhao Keng h. chung Chunming Xu Quan Shi State Key Laboratory of heavy Oil Processing China University of Petroleum Beijing 102249 China Daqing Oilfield Limited Corporation Daqing 163159 China North huajin Chemical Industries Group Corporation Panjin 124000 China

Delayed coking is an important petroleum resid conversion *** processability of coking liquids is known to be dependent on the heteroatom compounds present in the coking *** commercial delayed coking liquids were characterized by electrospray ionization(ESI)Fourier transform ion cyclotron resonance mass spectrometry(ESI FT-ICR MS)and gas chromatographic *** relatively abundant heteroatom compounds in the coking liquids were 1-4 aromatic-ring pyridinic nitrogen compounds,carbazoles,benzocarbazoles,phenols,mercaptans,benzothiophenes,dibenzothiophenes,and *** liquids derived from various feeds had similar compound class types,molecular weight distribution ranges,and double bond equivalents(DBE).however,the concentration of individual compounds and the distribution of DBE versus carbon number of heteroatom compounds varied.A comparison of heteroatom compounds in coker feeds and products revealed the various reaction mechanism of heteroatom compounds occurred during the coking *** results suggested that molecular-level process models can be developed for optimization of unit operation to obtain desirable products that meet the environmental specifications and quality requirements.

关键词： FT-ICR MS molecular composition heteroatom compounds petroleum delayed coking

Subchronic Oral Toxicity of Pyridostigmine Bromide in Rats

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Biomedical and Environmental Sciences 1991年第3期4卷 283-289页

作者： B.S.LEVINE R.LONG h.chung Department of Pharmacology University of Illinois at Chicago Chicago IL 60680Pathology Associates Inc. Chicago IL 60616Walter Reed Army Institute of Research WashingtonDC 20307

This study evaluated the oral toxicity of pyridostigmine bromide in Sprague-Dawley rats when administered for 13 weeks by daily gavage. Groups of 10 rats/sex received doses of 0, 5, 15, 30, or 60 mg/kg/day. Toxicity was limited to exaggerated cholinergic stimulation at doses of 15 mg/kg/day or greater. Significant findings included tremors and inhibition of RBC acetylcholinesterase. Thus, 5 mg/kg/day of pyridostigmine bromide appears to be the no observed toxic effect level under the conditions of the present investigation.

关键词： Subchronic Oral Toxicity of Pyridostigmine Bromide in Rats