Adsorption of alkanes and other organic molecules in liquid phase and in the dense vapor phase: Influence of polarity, zeolite topology, and external fluid density and pressure

被引:53
作者
Denayer, JF
Bouyermaouen, A
Baron, GV
机构
[1] Vrije Univ Brussel, Dept Chem Engn, B-1050 Brussels, Belgium
[2] Univ Libre Bruxelles, B-1050 Brussels, Belgium
关键词
D O I
10.1021/ie9801397
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Adsorption of alkanes, aromatics, and other organic molecules in liquid phase and the dense vapor phase was studied on FAU and MFI zeolites at temperatures ranging from 25 to 300 degrees C. On faujasites, no competitive adsorption between n-alkanes of different carbon number was observed at room temperature. At higher temperatures and lower fluid densities, longer n-alkanes start being adsorbed preferentially over short n-alkanes on faujasites. On MFI zeolites, longer n-alkanes have larger partition coefficients than short n-alkanes. The difference in competitive adsorption behavior resides in the different pore structures of these zeolites: mutual interactions of several molecules adsorbed in the supercages of the faujasites dominate over direct interaction with the zeolites' force field, while on MFI zeolites, only one n-alkane molecule fits in the cross diameter of the pore, thereby strongly reducing the adsorbate-adsorbate interactions. On MFI zeolites, small n-alkanes have unrestricted access to both channel types, while long n-alkanes have restricted access to part of the micropore structure. Separation by selective adsorption in liquid phase on faujasites depends to a high extent on differences in building blocks of the molecules.
引用
收藏
页码:3691 / 3698
页数:8
相关论文
共 38 条
  • [1] MEASUREMENT OF INTRACRYSTALLINE DIFFUSIVITIES IN NAX ZEOLITE BY LIQUID-CHROMATOGRAPHY
    AWUM, F
    NARAYAN, S
    RUTHVEN, D
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1988, 27 (08) : 1510 - 1515
  • [2] ANALYSIS OF ZLC DESORPTION CURVES FOR LIQUID-SYSTEMS
    BRANDANI, S
    RUTHVEN, DM
    [J]. CHEMICAL ENGINEERING SCIENCE, 1995, 50 (13) : 2055 - 2059
  • [3] MICRODYNAMICS OF METHANE, ETHANE AND PROPANE IN ZSM-5-TYPE ZEOLITES
    CARO, J
    BULOW, M
    SCHIRMER, W
    KARGER, J
    HEINK, W
    PFEIFER, H
    ZDANOV, SP
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1985, 81 : 2541 - 2550
  • [4] ADSORPTION OF BRANCHED AND CYCLIC PARAFFINS IN SILICALITE .1. EQUILIBRIUM
    CAVALCANTE, CL
    RUTHVEN, DM
    [J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1995, 34 (01) : 177 - 184
  • [5] CHIANG AST, 1993, P 4 INT C FUND ADS K, P81
  • [6] CHIMOWITZ EH, 1989, J SUPERCRIT FLUID, V2, P106
  • [7] A LIQUID-PHASE CHROMATOGRAPHIC STUDY OF SORPTION AND DIFFUSION OF GLUCOSE AND FRUCTOSE IN NAX AND KX ZEOLITE CRYSTALS
    CHING, CB
    RUTHVEN, DM
    [J]. ZEOLITES, 1988, 8 (01): : 68 - 73
  • [8] VAPOR-LIQUID EQUILIBRIA AT HIGH PRESSURES - CALCULATION OF PARTIAL MOLAR VOLUMES IN NONPOLAR LIQUID MIXTURES
    CHUEH, PL
    PRAUSNITZ, JM
    [J]. AICHE JOURNAL, 1967, 13 (06) : 1099 - +
  • [9] Measurement of liquid phase multicomponent adsorption in a synzyme partial oxidation catalyst
    Claessens, R
    Baron, GV
    [J]. CHEMICAL ENGINEERING SCIENCE, 1996, 51 (10) : 1869 - 1878
  • [10] High-temperature low-pressure adsorption of branched C5-C8 alkanes on zeolite beta, ZSM-5, ZSM-22, zeolite Y, and mordenite
    Denayer, JF
    Souverijns, W
    Jacobs, PA
    Martens, JA
    Baron, GV
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (23): : 4588 - 4597