|
|
|
|
|
| An asymmetric membrane of polyimide 6FDA-BDAF and its pervaporation desulfurization for n-heptane/thiophene mixtures |
| YANG Xiang-dong, YE Hong, LI Yan-ting, LI Juan, LI Ji-ding, ZHAO Bing-qiang, LIN Yang-zheng |
1、Institue of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2、Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R.China
3、School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing 100048, P.R.China
4、Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA |
|
|
|
摘要 Polyimide (PI) is a type of important membrane material. A soluble polymer was synthesized from 4,4´-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy) phenyl] hexafluoropropane (BDAF) by the two-step polymerization method. The polymer was proved to be polyimide 6FDA-BDAF by the Fourier transform infrared (FT-IR), the 1H-NMR and 19F-NMR spectra. An asymmetric membrane was prepared with the synthesized polyimide 6FDA-BDAF, it was porous in the 50 μm height bulk and dense in a 3–5 μm height surface. The membrane was used to separate n-heptane/ thiophene mixtures by pervaporation with sulfur (S) contents from 50 to 900 μg g–1. The total flux was enlarged from 7.96 to 37.61 kg m–2 h–1 with temperature increasing from 50 to 90°C. The membrane’s enrichments factor for thiophene were about 3.13 and dependent on the experimental conditions. The experimental results demonstrated that polyimide 6FDA-BDAF would be a potential membrane material for desulfurization and controlled release of the S-containing fertilizer.
Abstract Polyimide (PI) is a type of important membrane material. A soluble polymer was synthesized from 4,4´-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy) phenyl] hexafluoropropane (BDAF) by the two-step polymerization method. The polymer was proved to be polyimide 6FDA-BDAF by the Fourier transform infrared (FT-IR), the 1H-NMR and 19F-NMR spectra. An asymmetric membrane was prepared with the synthesized polyimide 6FDA-BDAF, it was porous in the 50 μm height bulk and dense in a 3–5 μm height surface. The membrane was used to separate n-heptane/ thiophene mixtures by pervaporation with sulfur (S) contents from 50 to 900 μg g–1. The total flux was enlarged from 7.96 to 37.61 kg m–2 h–1 with temperature increasing from 50 to 90°C. The membrane’s enrichments factor for thiophene were about 3.13 and dependent on the experimental conditions. The experimental results demonstrated that polyimide 6FDA-BDAF would be a potential membrane material for desulfurization and controlled release of the S-containing fertilizer.
|
|
Received: 14 August 2015
Accepted:
|
| Fund: The authors greatly appreciate the support from the Key Technology R&D Program of China (2011BAD11B05) and the National Nonprofit Institute Research Grant of Chinese Academy of Agricultural Sciences (2011-28; 2013-17). This work was supported by the National Basic Research Program of China (973 Program, 2003CB615701), the National Natural Science Foundation of China (20576059, 20676067, 31572204), the China Petroleum & Chemical Corporation (SINOPEC Foundation, X505002) and the China National Petroleum Corporation (CNPC) Innovation Foundation (05051143). |
|
Corresponding Authors:
LIN Yang-zheng, Tel: +86-10-62782432,Fax: +86-10-62770304, E-mail: sealin2008@hotmail.com
|
Cite this article:
YANG Xiang-dong, YE Hong, LI Yan-ting, LI Juan, LI Ji-ding, ZHAO Bing-qiang, LIN Yang-zheng.
2015.
An asymmetric membrane of polyimide 6FDA-BDAF and its pervaporation desulfurization for n-heptane/thiophene mixtures. Journal of Integrative Agriculture, 14(12): 2529-2537.
|
| Acharya H R, Stern S A, Liu Z Z, Cabasso I. 1988. Separationof liquid benzene/cyclohexane mixtures by perstractionand pervaporation. Journal Membrance Science, 37, 205.Ahmad M B, Gharayebi Y, Salit M S, Hussein M Z, EbrahimiaslS, Dehzangi A. 2012. Preparation, characterizationand thermal degradation of polyimide (4-APS/BTDA)/SiO2 composite films. International Journal of MolecularSciences, 13, 4860-4872Ayala D, Lozano A E, De Abajo J, García-Perez C, De la CampaJ G, Peinemann K V, Freeman B D, Prabhakar R. 2003.Gas separation properties of aromatic polyimides. Journalof Membrance Science, 215, 61-73Chen J, Li J, Qi R, Ye H, Chen C. 2010. Pervaporation separationof thiophene-heptane mixtures with polydimethylsiloxane(PDMS) membrane for desulfurization. Applied Biochemistryand Biotechnology, 160, 486-497Guo W F, Chung T S. 2005. Study and characterization ofthe hysteresis behavior of polyimide membranes in thethermal cycle process of pervaporation separation. Journalof Membrance Science, 253, 13-22Kim J H, Chang B J, Lee S B, Kim S Y. 2000. Incorporationeffect of fluorinated side groups into polyimide membraneson their pervaporation properties. Journal of Membrance ofScience, 169, 185-196Kuo Y, Chung T, Nominand H. 2003, Plasma hydrogenation - Anew method of reducing the k value of the low k polyimidefilm. MRS (Materials Research Society) Online ProceedingsLibrary, 766, 333.Lin L, Kong Y, Wang G, Qu H, Yang J, Shi D. 2006a. Selectionand crosslinking modification of membrane material for FCCgasoline desulfurization. Journal of Membrane Science, 285, 144-151Lin L, Wang G, Qu H, Yang J, Wang Y, Shi D, Kong Y. 2006b.Pervaporation performance of crosslinked polyethyleneglycol membranes for deep desulfurization of FCC gasoline.Journal of Membrane Science, 280, 651-658Qi R, Wang Y, Li J, Zhao C, Zhu S. 2006a. Pervaporationseparation of alkane/thiophene mixtures ith PDMSmembrane. Journal of Membrance Science, 280, 545-552Qi R, Wang Y, Li J, Zhu S. 2006b. Sulfur removal from gasolineby pervaporation: The effect of hydrocarbon species.Separation and Purification Technology, 51, 258-264Qi R, Zhao C, Li J, Wang Y, Zhu S, 2006c. Removal of thiophenesfrom n-octane/thiophene mixtures by pervaporation. Journalof Membrance Science, 269, 94-100Rychlewska K, Konieczny K. 2014. Pervaporativedesulfurization of gasoline-separation of hydrocarbon/thiophene mixtures using polydimethylsiloxane (PDMS)-based membranes. Desalination and Water Treatment. doi:10.1080/19443994.2014.988412Shi D, Kong Y, Yu J, Wang Y, Yang J. 2006. Separationperformance of polyimide nanofiltration membranes forconcentrating spiramycin extract. Desalination, 191,309-317Tanaka K, Islam M N, Kido M, Kita H, Okamoto K I. 2006.Gas permeation and separation properties of sulfonatedpolyimide membranes. Polymer, 47, 4370-4377Teng M Y, Li C L, Lee K R, Lai J Y. 2006. Permselectivities of3,3´,4,4´ benzhydrol tetraacarboxylic dianhydride basedpolyimide membrane for pervaporation. Desalination, 193,144-151Wang L, Zhao Z, Li J, Chen C. 2006. Synthesis andcharacterization of fluorinated polyimides for pervaporationof n-heptane/thiophene mixtures. European PolymerJournal, 42, 1266-1272Wang Y C, Huang S H, Hu C C, Li C L, Lee K R, Liaw D J,Lai J Y. 2005. Sorption and transport properties of gasesin aromatic polyimide membranes. Journal of MembranceScience, 248, 15-25Wind J D, Paul D R, Koros W J. 2004. Natural gas permeationin polyimide membranes. Journal of Membrance Science,228, 227-236White L S. 2002. Transport properties of a polyimide solventresistant nanofiltration membrane. Journal of MembranceScience, 205, 191-202White L S. 2006. Development of large-scale applicationsin organic solvent nanofiltration and pervaporation forchemical and refining processes. Journal of MembranceScience, 286, 26-35Yang Z, Zhang W, Li J, Chen J. 2012. Polyphosphazene membranefor desulfurization: Selecting poly[bis(trifluoroethoxy)phosphazene] for pervaporative removal of thiophene.Separation and Purification Technology, 93, 15-24Ye H, Li J, Lin Y, Chen J, Chen C. 2008. Synthesis of polyimidescontaining fluorine and their pervaporation performancesto aromatic/aliphatic hydrocarbon mixtures. Journalof Macromolecular Science (Part A: Pure and AppliedChemistry), 45, 172-178Zhao Y, Yuan Q. 2006. Effect of membrane pretreatment onperformace of solvent resistant nanofiltration membranesin methanol solutions. Journal of Membrance Science,280, 195-201 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
