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Chinese Journal of Chemical Engineering 2016年第2期24卷 323-329页

作者： Yangcheng Lu Jing He Longwen Wu Guangsheng Luo State Key Laboratory of Chemical Engineering Department of Chernical Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing School of Materials Sdence and EngineeringTsinghua UniversityBeijing 100084China

In this work, an equilibrium-dispersion model was successfully established to describe the breakthrough performance of Ca（Ⅱ） imprinted chitosan （Ca（Ⅱ）-CS） microspheres packed column for metal adsorption, and the assumptions of Langmuir isotherms and axial dispersion controlled mass transfer process were confirmed. The axial dispersion coefficient in Ca（Ⅱ）-CS microspheres packed column was found to be almost proportional to the linear velocity and fit for prediction through single breakthrough test. Sensitivity analysis for breakthrough curve indicated the axial dispersion coefficient as well as Langmuir coefficient was sensitive variable for deep removal requirement. The retrieval of the adsorption isotherms of Ca（Ⅱ）-CS microspheres from breakthrough curve was fulfilled by modelling calibration. A strategy based on the correlation between adsorption isotherms and breakthrough performance was further proposed to simplify the column adsorption design using absorbents with small/uniform size and fast adsorption kinetics like Ca（Ⅱ）-CS microspheres to cut down the gap between lab and industry.

关键词： Correlation breakthrough curve Adsorption isotherms Metal adsorption Ca(ll)-imprinted chitosan microsphere

Simulation of Cefoselis hydrochloride adsorption on macroporous resin in a fixed-bed column using orthogonal collocation

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1822-1828页

作者： Feng Xue Fugang Wang Shuai Chen Sheng Wang Shengui Ju Weihong Xing College of Chemical Engineering Nanjing Tech University

Adsorption operation is of great importance for separation and purification of semi-synthetic cephalosporin compounds in pharmaceutical industry. The adsorption dynamics of Cefoselis hydrochloride(CFH) on XR 920 C adsorbent in fixed bed was predicted by the model of modified film-pore diffusion(MFPD). The intraparticle diffusion equation and mass balance equation in fixed bed are discretized into two ordinary differential equations(ODEs) using the method of orthogonal collocation which largely improves the calculation accuracy. The MFPD model parameters including the pore diffusion coefficient(Dp), external mass-transfer coefficient(kf), and the axial dispersion(DL) were estimated. The kfvalue was calculated by the Carberry equation, in which the effective diffusion coefficient Dewas fitted based on Crank Model through experimental data. Moreover, three key operating parameters(i.e., initial adsorbate concentration; flow rate of import feed, and bed height of adsorbent) and the corresponded breakthrough curves were systematically studied and optimized. Therefore,this research not only provides valuable experimental data, but also a successfully mathematical model for designing the continuous chromatographic adsorption process of CFH.

关键词： Cefoselis hydrochloride breakthrough curve Orthogonal collocation Macroporous resin Fixed bed Simulation

Adsorption of Protein in the Expanded Bed

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Chinese Journal of Chemical Engineering 2000年第3期8卷 230-235页

作者：胡洪波姚善泾林东强朱自强 Zhejiang Univ Dept Chem Engn Hangzhou 310027 Peoples R China

The influence of operation parameters on the adsorption performance of protein (bovin serum albumin, BSA) in an expanded bed was studied using Streamline diethyl aminoethyl (DEAE). The result of residence time distributions (RTD) and breakthrough curves showed that adsorption performance of the expanded bed could not be improved by increasing the flow velocity at the range from 16ml·min-1 to 26ml·min-1. The increase of protein concentration from 0.5 mg·ml to 2 mg·ml-1 resulted in poor adsorption performance. With increasing temperature from 5℃ to 30℃ and the sedimented bed height from 11.5cm to 22.5cm, the adsorption characteristics in the expanded bed were improved.

关键词： adsorption performance expanded bed residence time distribution breakthrough curve protein

Lattice Boltzmann simulation of solute transport in a single rough fracture

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Water Science and Engineering 2014年第3期7卷 277-287页

作者： Zhi DOU Zhi-fang ZHOU School of Earth Sciences and Engineering Hohai University

In this study, the lattice Boltzmann method （LBM） was used to simulate the solute transport in a single rough fracture. The self-affine rough fracture wall was generated with the successive random addition method. The ability of the developed LBM to simulate the solute transport was validated by Taylor dispersion. The effect of fluid velocity on the solute transport in a single rough fracture was investigated using the LBM. The breakthrough curves （BTCs） for continuous injection sources in rough fractures were analyzed and discussed with different Reynolds numbers （Re）. The results show that the rough frac~＇e wall leads to a large fluid velocity gradient across the aperture. Consequently, there is a broad distribution of the immobile region along the rough fracture wall. This distribution of the immobile region is very sensitive to the Re and fracture geometry, and the immobile region is enlarged with the increase of Re and roughness. The concentration of the solute front in the mobile region increases with the Re. Furthermore, the Re and roughness have significant effects on BTCs, and the slow solute molecule exchange between the mobile and immobile regions results in a long breakthrough tail for the rough fracture. This study also demonstrates that the developed LBM can be effective in studying the solute transport in a rough fracture.

关键词： solute transport single rough fracture Lattice Boltzmann method, self-affinity breakthrough curve

Enrichment of CO from syngas with Cu（I）Y adsorbent by five-bed VPSA

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Frontiers of Chemical Science and Engineering 2013年第4期7卷 472-481页

作者： Shuna LI Huawei YANG Donghui ZHANG Chemical Engineering Research Center State key laboratory of chemical engineering Tianjin University Tianjin 300072 China

Cu（I）Y adsorbent was prepared by reduction of Cu（II）Y which was prepared by ion exchange between the NaY zeolite and a solution of Cu（II） chloride. The dynamic adsorption capacity of Cu（1）Y for CO was calculated by adsorption breakthrough curve measured on a fixed bed at 30~C and 0.006MPa （g） of CO partial pressure. The calculated CO adsorption capacity was 2.14 mmol/g, 37.5 times as much as that of NaY zeolite. The adsorption breakthrough curve experiment was also simulated with Aspen Adsorption software and the results were approxi- mately consistent with experimental results. Then a five- bed VPSA process for separating CO from syngas on this adsorbent was dynamically simulated with Aspen Adsorp- tion software with the adsorption pressure of 0.68 MPa （g） and the desorption pressure of -0.075MPa （g）. The results showed that CO was enriched from 32.3% to 95.16%-98.12%, and its recovery was 88.47%-99.44%.

关键词： Cu(I)Y adsorbent breakthrough curve deso-rption VPSA simulation

Batch and fixed-bed column studies of selenite removal from contaminated water by orange peel-based sorbent

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Water Science and Engineering 2020年第4期13卷 307-316页

作者： Barbara Perez Mora Fernando A.Bertoni María F.Mangiameli Juan C.Gonzalez Sebastian E.Bellu Faculty of Biochemical and Pharmaceutical Sciences National University of RosarioRosario S2002LRKArgentina Chemistry Institute of Rosario National Council of Scientific and Technological ResearchRosario S2002LRKArgentina

Orange peel is a biomass derived from citrus processing with desirable properties for metal *** recent years,orange peel has been used to remove various heavy metals and toxic ***(Se)is an essential trace element for ***,when the concentration of selenium exceeds an umbral limit,it becomes *** this study,orange peel was used to treat Se(IV)-contaminated water.A high sorption capacity of 32.5 mg/g was obtained at a temperature of 20℃and a pH of *** groups bound Se(IV)to the surface of the orange *** sorption process was spontaneous and endothermic.A chemical sorption mechanism was involved in the removal of Se(IV).The Thomas and modified dose-response models were used to simulate the experimental breakthrough *** bed depth service time model was used to calculate the critical bed depth(Z0),and the calculated Z0 value was 1.6 *** study reveals that orange peel is a useful sorbent for Se(IV),and can be used for the purification of Se(IV)-contaminated water.©2020 Hohai *** and hosting by Elsevier *** is an open access article under the CC BY-NC-ND license(http://***/licenses/by-nc-nd/4.0/).

关键词： Sorption Orange peel Removal of heavy metal Selenium-contaminated water Sorbent breakthrough curve

Gas phase tricholoethylene removal at low concentration using activated carbon fiber

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Journal of Environmental Sciences 2004年第1期16卷 53-55页

作者： LIUJun HUANGZheng-hong WANGZhan-sheng KANGFei-yu DepartmentofEnvironmentScienceandEngineering TsinghuaUniversityBeijing100084China DepartmentofMaterialScienceandEngineering TsinghuaUniversityBeijing100084China

The breakthrough adsorption behaviors of gas phase trichloroethylene in a packed bed of activated carbon fibers(ACF) were investigated. The specific surface area of the ACF was 600 m 2/g, 1400 m 2/g and 1600 m 2/g, respectively, and the concentration of trichloroethylene ranged from 270 mg/m 3 to 2700 mg/m 3. Results showed that the capacity of adsorption increased with increasing specific surface area, the relationship between the logarithms of 10% breakthrough time and concentration was approximately linear over the experimental range, the breakthrough time decreased with increasing temperature and humidity. The breakthrough curves at different inlet concentration or different temperature can be predicted by several simple theoretical models with good agreements.

关键词： trichloroethylene activated carbon fiber adsorption breakthrough curve

Adsorption characteristics of carbon tetrachloride from aqueous solution onto polyacrylonitrile-based activated carbon fiber

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Journal of Central South University 2010年第5期17卷 972-978页

作者：刘文霞官宝红于洁 Department of Environmental Engineering Zhejiang University

The isotherm,mechanism and kinetics of carbon tetrachloride(CT) adsorption by polyacrylonitrile-based activated carbon fiber(PAN-ACF) were investigated in batch reactors and a continuous flow reactor,and the regeneration of PAN-ACF was also *** and Dubinin-Radushkevich(D-R) adsorption equations can well describe the adsorption *** is mainly adsorbed on the exterior surface of PAN-ACF with low boundary layer effect and rate-controlling step of intra-particle *** adsorption dynamics in the batch reactor well fits with the pseudo-first-order model,and the breakthrough curves in the continuous flow reactor can be well described by the Yoon-Nelson *** ACF can be recycled through thermal regeneration,whereas the adsorption capacity decreases from 7.87 to 4.98 mg/g after the fourth regeneration.78%-94%of CT can be removed from the wastewater of a fluorine chemical plant on a pilot scale,which confirms the efficacy of ACF under industrial *** results indicate that PAN-ACF is applicable to CT removal from wastewater.

关键词： adsorption carbon tetrachloride activated carbon fiber isotherm kinetics breakthrough curve

Migration of Infiltrated NH_4 and NO_3 in a Soil and Groundwater System Simulated by a Soil Tank

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Pedosphere 2008年第5期18卷 628-637页

作者： WANG Chao WANG Pei-Fang State Key Laboratory of Hydrology- Water Resources and Hydraulic Engineering Key Laboratory of Integrated Regulationand Resource Department on Shallow Lakes Ministry of Education Environmental Science and Engineering CollegeHohai University Nanjing 210098 （China）.

The infiltration of water contaminants into soil and groundwater systems can greatly affect the quality of groundwater. A laboratory-designed large soil tank with periodic and continuous infiltration models, respectively, was used to simulate the migration of the contaminants NH4 and NO3 in a soil and groundwater system, including unsaturated and saturated zones. The unsaturated soil zone had a significant effect on removing NH4 and NO3 infiltrated from the surface water. The patterns of breakthrough curves of NH4 and NO3 in the unsaturated zone were related to the infiltration time. A short infiltration time resulted in a single sharp peak in the breakthrough curve, while a long infiltration time led to a plateau curve. When NH4 and NO3 migrated from the unsaturated zone to the saturated zone, an interracial retardation was formed, resulting in an increased contaminant concentration on the interface. Under the influence of horizontal groundwater movement, the infiltrated contaminants formed a contamination-prone area downstream. As the contaminants migrated downstream, their concentrations were significantly reduced. Under the same infiltration concentration, the concentration of NO3 was greater than that of NH4 at every corresponding cross-section in the soil and groundwater tank, suggesting that the removal efficiency of NH4 was greater than that of NO3 in the soil and groundwater system.

关键词： breakthrough curve migration NH4 NO3 soil tank experiment

Synthesis and Evaluation of Microporous Metal Organic Frameworks for Light Hydrocarbon Adsorption

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China Petroleum Processing & Petrochemical Technology 2022年第4期24卷 120-128页

作者： Wen Guilin Li Ying Li Jianzhe Li Qingrun Zhang Hongxing Xiao Anshan Tao Bin State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety Engineering Co.Ltd.Qingdao 266101China

Five microporous MOFs were synthesized and their static adsorption properties for light hydrocarbons were experimentally investigated at 298 K and 150 *** the five MOFs,HKUST-1 and Ni(bdc)(ted)0.5 exhibited much higher uptakes of ethane and propane than PCN-250,UiO-66,and *** experiments were carried out at 298 K and atmospheric pressure on HKUST-1 and two commercially used ***-1 exhibited a much lower dynamic than static adsorption ***,HKUST-1 and the two traditional adsorbents could effectively separate binary(ethane/propane)and ternary(ethane/propane/toluene)mixtures.

关键词： light hydrocarbons metal-organic frameworks adsorption breakthrough curve adsorption selectivity