EXCESS PROPERTIES OF BINARY-MIXTURES CONTAINING 2-METHOXY-2-METHYLPROPANE (MTBE) AND ALKYL ALKANOATES AT 298.15K

Excess molar enthalpies, H-m(E), and excess molar volumes, V-m(E), Of 2-methoxy-2-methylpropane (MTBE) and four pairs of structural isomers of alkyl alkanoates (ethyl propanoate, propyl ethanoate, ethyl butanoa te, butyl ethanoate, ethyl pentanoate, pentyl ethanoate, ethyl hexanoa te, and hexyl ethanoate) have been determined at 298.15 K and at atmos pheric pressure using a flow microcalorimeter and an Anton Paar densit y meter. H-m(E) and V-m(E) values decrease as the chain length of the alkanoates is increased, showing marked negative values for V-m(E). In contrast the H-m(E) values are small for all mixtures and vary from a pproximate to 95 J.mol(-1) (ethyl propanoate) up to approximate to-70 J.mol(-1) (ethyl hexanoate); they are positive only for mixtures with ethyl propanoate, propyl ethanoate, ethyl butanoate, and butyl ethanoa te and negative for the other mixtures. Results have been correlated u sing the Redlich-Kister equation.