ISSN:
1572-8927
Schlagwort(e):
Solubility
;
high pressure
;
xylene
;
hydrophobic interaction
;
partial molar volume
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The solubilities of o-, m- and p-xylene in water were measured at 25.0°C up to 250, 385, and 50 MPa, respectively. The solubility increased with increasing pressure up to 120 MPa (50 MPa for p-xylene) and then decreased. The reaction volumes, ΔVo accompanying the dissolution at 0.1 MPa were estimated as −3.6±0.5, −3.4±0.5, and −4.1±0.5 cm3-mol−1 for o-, m-, and p-xylene, respectively, from the pressure dependences of the solubilities. The limiting partial molar volumes, of p- and o-xylene in water under high pressure were estimated from ΔVo and the molar volume of the xylene. The partial molar volumes decreased with increasing pressure. The reaction volume for the formation of intra-molecular pairwise hydrophobic interaction between the methyl groups, as proposed by Ben-Naim, is discussed for the ΔVo of p- and o-xylene at 0.1 MPa.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00649092
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