Solubility properties in polymers and biological media. II. A new method for the characterisation of the adsorption of gases and vapours on solids.
Henry's constants at zero solute pressure have been determined by the gas chromatographic peak shape method for twenty-two solutes on four adsorbents (Rohm and Haas Ambersorb XE-348F carbonaceous adsorbent at 323 and 373 K, Sutcliffe Speakman 207A and 207C at 323 K, and Calgon Filtrasorb activated carbon at 323 K). The limiting values of log KH have been analysed in terms of solute dipolarity (pi 2*), solute hydrogen-bond acidity (alpha 2), and basicity (beta 2), and a new solute parameter (log L16), the solute Ostwald absorption coefficient on eta-hexadecane. The multiple linear regression equation, SP = SP0 + l.log L16 + s(pi 2* + d delta 2) + a alpha 2 + b beta 2 where in this instance SP = -log KH, can be used to identify the nature of the solute-adsorbent interactions, and to predict further values of log KH. For the solutes and solids we have studied, only the l.log L16 term is statistically significant, and hence--log KH is proportional to l.log L16. It is concluded that interactions between the gaseous solutes (that include alcohols and amines) and the four adsorbents involve just general dispersion forces.
Department of Chemistry, University of Surrey, Guildford, U.K.
M H
MH
Abraham
G J
GJ
Buist
P L
PL
Grellier
R A
RA
McGill
R M
RM
Doherty
M J
MJ
Kamlet
R W
RW
Taft
S G
SG
Maroldo
D000097:Acetonitriles / Q000032:analysis; D000327:Adsorption; D005740:Gases / Q000032:analysis*; D011108:Polymers / Q000032:analysis*; D012995:Solubility; D013816:Thermodynamics
D000097:Acetonitriles; D005740:Gases; D011108:Polymers