Adsorbed media and their molecular sizes

  1. Molecule

    Molecule critical diameter, A

    Molecule length, A


    Hydrocarbons


    Methane

    3.8

    Ethane

    4.0

    4.6

    Propane

    4.9

    6.52

    n-Butane

    4.9

    7.78

    n-Pentane

    4.9

    9.04

    n-Hexane

    4.9

    10.34

    n-Heptane

    4.9

    11.5

    Other normal paraffins

    4.9


    Neopentane

    7.0

    7.08

    Ethylene

    4.0

    4.6

    Propylene

    4.0

    6.5

    Buten-1

    4.9

    5.6

    Buten-2

    4.9

    1,3-Butadiene

    5.2

    Cyclopropane

    4.9


    Cyclohexane

    6.1

    Acetylene

    2.4


    Benzol

    6.0

    5.7

    Toluene

    6.7

    o-Xylol

    6.0-7.4

    n-Xylol

    6.5-6.8

    Thiophene

    5.3

    Isobutane

    5.6


    Isopentane

    5.6


    Acetylene

    2.4



    Industrial gas components


    Hydrogen

    2.4

    3.1

    Oxygen

    3.4

    3.9

    Nitrogen

    3.7

    4.1

    Carbon disulfide

    3.7

    Nitrous-nitric oxide

    5.0

    Ammonia

    3.6

    Carbon oxide

    2.8

    4.1

    COS

    2.7


    Water

    2.7

    3.2

    Carbon dioxide

    3.1

    4.1


    Acidic organic materials


    Methyl alcohol

    4.0

    Ethyl alcohol

    4.7

    5.9

    Butyl alcohol

    5.8

    Acetic acid

    5.1


    Ethyl ester

    5.1


    Diethyl alcohol

    5.1

    Acetaldehyde

    4.4

    Ethylene oxide

    4.2


    Halogenous media


    Bromine

    3.9


    Iodine

    4.3


    CHCl3

    6.9


    CF4

    5.5


    CCl4

    6.9

    7.1

    CBr4

    7.5

    7.7

    C(CH3)4

    6.9

    7.1

    C2F6

    5.3


    C2Cl6

    6.9


    CF3Cl

    4.9


    CF3Cl2

    4.9


    CF3H

    4.8


    CF2ClH

    4.9



    Rare gases


    Helium

    2.0


    Neon

    3.2


    Argon

    3.8


    Krypton

    3.9


    Xenon

    4.4



    Other media


    Tetramethylmethane

    6.8

    7.0

    1,3,5-triethylbenzol

    8.2


    Diperflourethylpropylamine

    8.7

    Tripropylamine

    9.1

    Hexaethylbenzol

    10.0

    Triperflourbutylamine

    11.5

    Triphenilmethanol

    14.0



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