T. Gross et al., T,p dependence of intradiffusion in binary fluid mixtures with carbon dioxide as one component, PHYS CHEM P, 3(14), 2001, pp. 2845-2851
Intradiffusion coefficients D-ii were measured by the pulsed field gradient
NMR technique for five binary systems with carbon dioxide as one component
, the second component being benzene, hydrogen, palmitic acid methyl ester,
acetic acid or methanol. The studies are limited for most systems to low t
emperatures because of the onset of crystallisation. They are extended to a
maximum pressure of 200 MPa. The concentration dependence of the hydrogen-
containing mixtures shows, at the carbon dioxide rich side of the D-ii vs.
x diagram, a fairly steep increase in diffusivity with hydrogen concentrati
on. The analysis of the methanol/carbon dioxide system is complemented by s
tudies of the hydroxyl proton chemical shift. The x, T, p dependence of the
chemical shift is described by a linear association model. These data show
clearly that the carbon dioxide molecule does not form any hydrogen bonds
with the methanol hydroxyl group.