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Innovative hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride(PVDF)composite membrane for vacuum membrane distillation

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Chinese Journal of Chemical Engineering 2022年第5期35卷 248-257页

作者： Jun Pan Xianli Xu Zhaohui Wang Shi-Peng Sun Zhaoliang Cui Lassaad Gzara Iqbal Ahmed Omar Bamaga Mohammed Albeirutty Enrico Drioli State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 210009China National Engineering Research Center for Special Separation membrane Nanjing Tech UniversityNanjing 210009China Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM) Nanjing Tech UniversityNanjing 210009China Center of Excellence in Desalination Technology King Abdulaziz UniversityJeddah 21589Saudi Arabia Mechanical Engineering Department King Abdulaziz UniversityJeddah 21589Saudi Arabia Research Institute on membrane Technology ITM-CNRVia Pietro Bucci 17/CRende 87036Italy

Though membrane distillation(MD)has gained more and more attention in the field of desalination,the wetting phenomenon was still a non-negligible *** this work,a method combined dip-coating and UV in situ polymerization for preparing hydrophobic/hydrophilic perfluoropolyether(PFPE)/polyvinylidene fluoride composite *** composite membrane consisted of a top thin hydrophobic coating layer and hydrophilic substrate *** terms of anti-wetting properties,contact angle and liquid entry pressure of all composite membranes(except for those based on 0.45μm)exceeded 160°and 0.3 MPa,*** particular,the desalination performance was tested in vacuum membrane distillation tests by feeding 3.5%(mass)saline solution(NaCl)at 60℃.The composite membranes with larger support pore size and lower PFPE content had higher membrane distillation *** for stability tests(testing the 0.22μm membrane coated by 5%(mass)PFPE),the highest MD flux29.08 kg·m^(-2)·h^(-1) and stable salt rejection(over 99.99%)during the *** that,the effects of coating material concentration and pore sizes of substrate membrane were also investigated for surface morphology and topography,porosity,mechanical strength and pore size *** work provided a simple and effective alternative to prepare excellent hydrophobic composite membranes for MD applications.

关键词： Desalination membrane surface coating Composite membranes Anti-wetting vacuum membrane distillation

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Hydrochloric acid recovery from rare earth chloride solutions by vacuum membrane distillation

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Rare Metals 2006年第3期25卷 287-292页

作者： TANG Jianjun ZHOU Kanggen School of Construction and Environmental Engineering Shenzhen Polytechnic Shenzhen 518055 China Metallurgical Separation Science and Engineering Lab Central South University Changsha 410083 China

The possibility of the recovery of hydrochloric acid from rare earth （RE） chloride solutions was first experimentally studied by batch vacuum membrane distillation （VMD）. The recovery by continuous VMD was also studied to devise methods that enabled the operation of VMD setup in a stable condition as well as to increase the membrane-operating life The results indicated that HCl separation with RE by VMD was possible, and the recovery ratio of 80% could be achieved by batch VMD. In continuous VMD, when the temperature of circular solutions, circular rate, and downstream pressure was 62-63℃, 5.4 cm/s, and 9.33 kPa, respectively, the HCl concentration in circular solutions and the processing capacity per membrane area were obtained. The mathematical results were in accordance with the experimental ones.

关键词： membrane separation hydrochloric acid recovery vacuum membrane distillation rare earth mathematical stimulation

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Simultaneous recovery of phosphorus and nitrogen from liquid digestate by vacuum membrane distillation with permeate fractional condensation

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1558-1565页

作者： Boya Qiu Senqing Fan Xiaoyu Tang Bufan Qi Liangwei Deng Wenguo Wang Jingyun Liu Yuyang Wang Zeyi Xiao School of Chemical Engineering Sichuan UniversityChengdu 610065China Biogas Institute of Ministry of Agriculture and Rural Affairs Chengdu 610041China College of Pharmacy and Biological Engineering Chengdu UniversityChengdu 610106China Key Laboratory of Development and Application of Rural Renewable Energy Ministry of Agriculture and Rural AffairsChengdu 610041China

A vacuum membrane distillation(VMD)process with permeate fractional condensation on membrane downstream has been developed for simultaneous recovery of phosphorus and nitrogen from liquid *** polytetrafluoroethylene(PTFE)membrane flux could reach 6000 g·m-2·h-1 with the rejection efficiency of total phosphorus(TP)over 0.99,under the condition of flowrate being 120 L·h-1 and temperature being 40°*** fouling occurred with a film of organics and microorganism deposited on the surface of the *** flux could be reversed after the membrane was rinsed by *** feed temperature and flowrate could improve the membrane flux,while hardly affect the rejection efficiency of total *** concentration of TP could reach 1600 mg·L-1 after membrane distillation,which is about 5 times of that in initial liquid *** the downstream of the membrane,some of the permeate vapor was condensed under the vacuum condition and most of water was collected *** remaining vapor enriched with total nitrogen(TN)was compressed and pumped to the atmospheric condition to *** TN concentration in atmospheric condensate was as high as 7000 mg·L-1 with the process separation factor for ammonia being enhanced to 114.

关键词： Liquid digestate Resource recovery vacuum membrane distillation Permeate fractional condensation Enhanced separation factor

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Hydrochloric Acid Recovery from Rare Earth Chloride Solutions by vacuum membrane distillation (1) Study on the Possibility

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Journal of Rare Earths 2003年第S1期21卷 78-82页

作者：唐建军周康根赵方辉李荣光张启修 New Materials and Bio-Technology Key Laboratory Research Institute of Tsinghua University in Shenzhen Metallurgical Separation Science and Engineering Laboratory Central South University

The equilibrium between the gas-liquid phases of the system of HCl-RECl_3-H_2O was analyzed,and the possibility of hydrochloric acid recovery from rare earth chloride solutions by vacuum membrane distillation (VMD) was experimentally studied in the laboratory scale. The results indicate that increasing initial concentrations of both hydrochloric acid and rare earth increase recovery ratio of hydrochloric acid,and recovery ratio of 80% can be achieved. Concentrated multiple of rare earth shows great influence on recovery ratio,leakage ratio of rare earth is less than 2% generally,and pure acid can be acquired in the permeate side. The two factors,namely flux and leakage ratio,which may determine the future use of VMD were also discussed.

关键词： vacuum membrane distillation hydrochloric acid rare earths

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Removal of 2,4-dichlorophenol from wasterwater by vacuum membrane distillation using hydrophobic PPESK hollow hiber membrane

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Chinese Chemical Letters 2007年第12期18卷 1543-1547页

作者： Zhao Jin Da Ling Yang Shou Hai Zhang Xi Gao Jian Department of Polymer Science and Materials Dalian University of Technology Dalian 116012 China Liaoning High Performance Polymer Engineering Research Center Liaoning Province 116012 China

2,4-Dichlorophenol was removed from wasterwater using a new hydrophobic poly（phthalazinone ether sulfone ketone）（PPESK） hollow fiber membrane by vacuum membrane distillation （VMD）.

关键词： Poly(phthalazinone ether sulfone ketone) Hydrophobic hollow fiber membrane vacuum membrane distillation 2,4-Dichlorophenol Removal factor

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