ISSN:
1572-8927
Schlagwort(e):
Activity coefficient
;
adduct formation
;
butanol
;
complexation
;
m-cresol
;
extraction
;
hydrogen bonding
;
isomers
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Equilibrium distribution ratios were measured for the four butanol isomers between aqueous solutions and solutions of m-cresol in n-octane at various concentrations at 25°C. At any fixed extractant concentration, the order of the distribution ratios among the butanol isomers, from highest to lowest, is n〉i〉s〉t. A comparison of the activity coefficients of the isomers in the aqueous and organic phases, the latter calculated from the measured distribution data, suggests that the dominant isomeric effects reside in the aqueous phase. The mass-action-law interpretation of the distribution data indicates a one-to-one stoichiometry of the butanol:cresol adduct for all of the isomers. The apparent stability of the adduct, with heterogeneous formation constant between 1 and 3 kJ-mol−1, decreases with increasing branching of the butanol.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00662923
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