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Optimization of Hydrocracking Process for Enhanced BTX Production from Coal Tar-Derived Hydrorefined Products

China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 139-151页

作者： Wu Hao wei hongyuan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

Hydroconversion of coal tar to produce aromatic hydrocarbons(BTX)represents a crucial strategy for the highvalue hierarchical utilization of *** study focused on the hydrocracking of hydrorefined products derived from coal tar to enhance the production of benzene,toluene,and xylene(BTX).Various reaction conditions,including reaction temperature,hydrogen pressure,space velocity,and hydrogen-to-oil volume ratio,were systematically explored to optimize BTX yields while also considering the process’s economic *** results indicate that increasing the reaction temperature from 360℃ to 390℃ significantly favors the production of BTX,with yields increasing from 21.42%to 41.14%.Similarly,an increase in hydrogen pressure from 4 MPa to 6 MPa boosts BTX production,with yields rising from 36.31%to 41.14%.Reducing the space velocity from 2 h^(-1) to 0.5 h^(-1) also favors the BTX production process,with yields increasing from 37.96%to 45.13%.Furthermore,raising the hydrogen-to-oil volume ratio from 750 to 1500 improves BTX yields from 41.61%to 45.44%.Through economic analysis,the optimal conditions for BTX production were identified as a reaction temperature of 390℃,hydrogen pressure of 5-6 MPa,space velocity of 1 h^(-1),and hydrogen-to-oil volume ratio of 1000,achieving a BTX yield of 43.73%.This investigation highlights the importance of a holistic evaluation of hydrocracking conditions to optimize BTX ***,the findings offer valuable insights for the design and operation of industrial hydrocracking processes aimed at efficiently converting coal tar-derived hydrorefined feedstock into BTX.

关键词： coal tar hydrocracking BTX process optimization economic assessment

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Ultra-deep Removal of Metal Ions from Coal Tar by Complexation:Experimental Studies and Density Functional Theory Simulations

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China Petroleum Processing & Petrochemical Technology 2023年第3期25卷 127-135页

作者： Wu Hao wei hongyuan Li Wangliang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

As one of the important aspects of upgrading coal tar,the ultra-deep removal of metal ions via the complexation method was investigated by screening four complexing agents and performing density functional theory(DFT)*** of the compositions and contents of the metallic compounds in the coal tar revealed that the main components were iron and calcium *** filtration reduced the mechanical impurity content from 0.24%to 0.0752%,indicating that most of the large particles could be easily *** the four complexing agents,namely,acetic acid,oxalic acid,citric acid,and ethylenediaminetetraacetic acid,oxalic acid exhibited the best demetallization *** DFT simulations suggested that the high performance of oxalic acid originated from its 1:1 coordination mode,rigid dicarboxyl structure,and greater binding energy.

关键词： complexation metallic compounds coal tar upgrading density functional theory

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Solubility and Thermodynamic Properties of Sulfamethazine-Saccharin Cocrystal in Pure and Binary (Acetonitrile + 2-Propanol) Solvents

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Transactions of Tianjin University 2021年第6期27卷 460-472页

作者： hongyuan wei Ningcan Gao Leping Dang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China

In this work,a new crystallization method was used to prepare two polymorphs of sulfamethazine-saccharin(SMT-SAC)cocrystal in *** purity and crystal form of both polymorphs were confirmed by optical microscopy,scanning electron microscopy,powder X-ray diff raction,diff erential scanning calorimetry,and thermogravimetric ***,the solubility of the stable form(form Ⅱ)was determined by gravimetric analysis in nine pure solvents and one binary(acetoni-trile+2-propanol)solvent at temperatures ranging from 278.15 to 348.15 K at atmospheric *** data were correlated using the modified Apelblat model,theλh equation,the nonrandom two-liquid(NRTL)model,the Jouyban-Acree model,and the CNIBS/Redlich-Kister ***,the apparent thermodynamic properties,such asΔ_(dis)G,Δ_(dis) H,andΔ_(dis) S,were calculated on the basis of the activity coefficient obtained by the NRTL *** the models correlate well,and all the experimental and calculated results indicate that the dissolution behavior of SMT-SAC cocrystal form II is a spontaneous,endothermic,and entropy-driven process.

关键词： Sulfamethazine-saccharin cocrystal Solid-liquid equilibrium Thermodynamic model Dissolution thermodynamic property

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Black Phosphorus/Nanocarbons Constructing a Dual-Carbon Conductive Network for High-Performance Sodium-Ion Batteries

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Transactions of Tianjin University 2022年第2期28卷 132-143页

作者： Leping Dang Jiawei He hongyuan wei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Black phosphorus has been recognized as a prospective candidate anode material for sodium-ion batteries(SIBs)due to its ultrahigh theoretical capacity of 2596 mA·h/g and high electric conductivity of≈300 S/***,its large volume expansion and contraction during sodiation/desodiation lead to poor cycling *** this work,a BP/graphite nanoparticle/nitrogen-doped multiwalled carbon nanotubes(BP/G/CNTs)composite with a dual-carbon conductive network is successfully fabricated as a promising anode material for SIBs through a simple two-step mechanical milling *** unique structure can mitigate the eff ect of volume changes and provide additional electron conduction pathways during ***,the formation of P–O–C bonds helps maintain the intimate connection between phosphorus and carbon,thereby improving the cycling and rate *** a result,the BP/G/CNTs composite delivers a high initial Coulombic efficiency(89.6%)and a high specific capacity for SIBs(1791.3 mA·h/g after 100 cycles at 519.2 mA/g and 1665.2 mA·h/g after 100 cycles at 1298 mA/g).Based on these results,the integrated strategy of one-and two-dimensional carbon materials can guide other anode materials for SIBs.

关键词： Sodium-ion batteries Anode material Black phosphorus Ball milling Carbon conductive network

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Simultaneous optical and electrochemical recording of single nanoparticle electrochemistry

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Nano Research 2017年第5期10卷 1740-1748页

作者： Linlin Sun Yimin Fang Zhimin Li wei Wang hongyuan Chen State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093 China

Single nanoparticle collisions have become popular for studying the electro- chemical activity of single nanoparticles by determining the transient current during stochastic collisions with the electrode surface. However, if only the electrochemical current is measured, it remains challenging to identify and characterize the individual particle that is responsible for a specific current peak in a collision event; this hampers the understanding of the structure-activity relationship. Herein, we report simultaneous optical and electrochemical recording of a single nanoparticle collision; the electrochemical signal corresponds with the activity of a single nanoparticle, and the optical signal reveals the size and location of the same nanoparticle. Consequently, the structure （optical signal）- activity （electrochemical signal） relationship can be elucidated at the single nanoparticle level; this has implications for various applications including batteries, electrocatalysts, and electrochemical sensors. In addition, our previous studies have suggested an optical-to-electrochemical conversion model to independently calculate the electron transfer rate of single nanopartides from the optical signal. The simultaneous optical and electrochemical recording achieved in the present work enables direct and quantitative validation of the optical-to-electrochemical conversion model.

关键词： single nanoparticlecollision surface plasmonresonance microscopy plasmonics-basedelectrochemicalmicroscopy Ag nanoparticles

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Synergistic Effect of Cocamidopropyl Betaine and Sodium Lauroyl Sarcosinate

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Transactions of Tianjin University 2021年第5期27卷 366-376页

作者： hongyuan wei Rui Zhang Zhong Lei Leping Dang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Procter&Gamble Technology(Beijing)Co. Ltd.Beijing 101312China

In this study,we investigated the synergistic effect of a zwitterionic surfactant(cocamidopropyl betaine)and amino acid surfactant(sodium lauroyl sarcosinate)by measurements of surface tension,rheological properties,dynamic light scattering(DLS),and transmission electron microscopy(TEM).The results confirm the formation of wormlike micelles in the mixed system,which leads to superior surface activity as compared to that of an individual *** and dynamic viscoelastic measurements were also performed to explore the characteristics of wormlike micelles at different mole fractions,p H values,and *** results indicate that the strongest wormlike structure formed under the conditions of X_(1)=0.5,pH=4.7,and C T=600 mmol/*** size and morphology of the mixed micelles were obtained by DLS and *** results of this work offer insight into the interaction between zwitterionic and amino acid surfactants,which will contribute to the design of complex surfactants.

关键词： Surfactant Synergistic effect Rheology Wormlike micelles

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Crystal Structure Stability of Simulated Sr1-1.5xYxTiO3(x=0-0.12)Waste Forms

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Journal of Wuhan University of Technology(Materials Science) 2017年第1期32卷 89-93页

作者：牟婉君 YU Qianhong LI Xingliang wei hongyuan 蹇源 Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

A series of Sr1-1.5xYxTiO3（x = 0-12） solid solutions were synthesized by a solid state reaction *** effects of reaction temperature and dopant on the crystallinity,microstructure and morphology of Sr1-1.5xYxTiO3（x=0-0.12） were *** and single-phase perovskite-type Sr1-1.5xYxTiO3（x0.08） solid solutions were obtained at 1 400 ℃ for 6 *** perovskite-type SrTiO3 and pyrochlore-phase Y2Ti2O7 coexisted for x = 0.08-0.12,leading to an unstable and unfavourable solid solution structure for long-term immobilization of the *** X-ray diffraction patterns for Rietveld refinement analysis confirmed the formation of a Sr1-1.5xYxTiO3（x = 0-0.12） continuous solid *** and bending vibrations were assigned in the infrared *** SrTiO3 grain size increased with Y *** leaching behavior of Y^3＋ from the waste forms of Sr1-1.5xYxTiO3 was controlled by its structural change.

关键词： perovskite-type SrTiO3 phase transition temperature leaching behavior

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Hydrothermal Synthesis of WO3 Nanowires in the Presence of Guanidine Sulfate and Its Photocatalytic Activity

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Journal of Wuhan University of Technology(Materials Science) 2016年第4期31卷 731-735页

作者：牟婉君 yu qianhong li xingliang wei hongyuan 蹇源 Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

WO3 nanowires were fabricated by a hydrothermal method,which proceeded at 170 ℃ for 48 h in a solution containing C2H10N6H2SO4 as a dispersant and Na2WO4 as a starting *** nanowires exhibit a well crystallized one-dimensional structure with 20 nm in diameter and several microns in *** physicochemical properties of WO3 were compared using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,energy dispersive X-ray spectroscopy（EDX） and UV-vis spectroscopy（UV-Vis）.The photoactivity of the as-perpared WO3 nanowires was evaluated through the photodegradation of methylene blue（MB） in aqueous *** experimental results demonstrate that addition of C2H10N6H2SO4 salt in the WO3 nanowires synthesis process can enhance its photocatalytic activity obviously.

关键词： hydrothermal photocatalytic dispersive crystallized tungsten starting length hexagonal methylene nanotubes

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Effects of Formulation Parameters and Process Variables on the Properties of Granules Obtained by Reactive Granulation

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Transactions of Tianjin University 2018年第3期24卷 224-233页

作者： Leping Dang Xiaojun Lang Xu Li hongyuan wei School of Chemical Engineering and Technology Tianjin University

In this work, granulation between dodecyl-benzenesulfonic acid and sodium carbonate was investigated in a laboratory-scale high shear mixer. The effects offormulation parameters and process variables, including primary carbonate size, binder content, impeller speed, and operating temperature, were correlated to the properties ofthe product granules. Design ofexperiment and analysis ofvariance were combined to analyze the experimentaldata, and results showed that larger granule sizes with fewer fine particles can be obtained by employing higher binder contents and larger sodium carbonate sizes. The shear force ofthe impeller can extensively break oversized granules. The binder content exerted a contrasting effect on the flowability ofgranules formed with two kinds ofsodium carbonate, likely because ofdifferences in the liquid saturation ofthe solids. The dissolution rate determined by in-line size analysis showed that high binder contents were beneficialto dissolution performance, and the relationships between Hunter color and tested parameters were evaluated. The results ofthis work can be used as a reliable guidance for process controland optimization in powder detergent manufacturing.

关键词： Dry neutralization Granulation Size Flowability Dissolution rate Color

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Paraffin/SiC as a Novel Composite Phase-Change Material for a Lithium-Ion Battery Thermal Management System

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Transactions of Tianjin University 2021年第1期27卷 55-63页

作者： wei Kang Yiqiang Zhao Xueheng Jia Lin Hao Leping Dang hongyuan wei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Tianjin Lishen Battery Joint-Stock Co. LtdTianjin 300072China

A lithium-ion battery thermal management system has always been a hot spot in the battery industry. In this study, a novel high-thermal-conductivity composite phase-change material(CPCM) made by paraffin wax and silicon was adopted to facilitate heat transfer. Moreover, high resistance or even insulation of CPCM is capable of preventing short circuits between the cells. The heat transfer mechanism of CPCMs was determined under a scanning electron microscope. A thermogravimetric analyzer was employed to determine the thermal stability. A diff erential scanning calorimeter was used to explore the thermophysical properties of the composite samples. By comparing the results of the experiment, it was reported that under the silicon carbide content of 5%, the parameters were better than others. The phase-change enthalpy of CPCM was 199.4 J/g, the leakage rate of liquid was 4.6%, and the melting point was 53.6℃. To verify the practicality of CPCM, a three-dimensional layered battery pack model was built in the COMSOL Multiphysics software. By simulating the thermal runaway inside the battery packs of various materials, it was reported that the addition of CPCM significantly narrowed the temperature range of the battery pack from 300–370 to 303–304 K. Therefore, CPCM can eff ectively increase the rate of heat transfer to prevent the chain of thermal runaway reactions. It also enables the battery pack to run at a stable temperature.

关键词： Lithium-ion battery Phase-change material Paraffin Silicon carbide Thermal runaway

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