(P,V,T,X) MEASUREMENTS FOR TETRAHYDROFURAN AND (XC(4)H(8)O-X)H2O)((1)

The effect of pressure on the volume of tetrahydrofuran (THF) has been measured as the ratio of the volume under pressure to its value at 0. 1 MPa pressure with a bellows volumometer for temperatures from T = (2 78 to 323) K at pressures up to 300 MPa. Similar measurements have bee n made for two of its mixtures with water, x(THF) = (0.25 and 0.5) for temperatures from T = (288 to 338) K. The data have been fitted with two equations of state. Densities at atmospheric pressure have been me asured for THF and for aqueous mixtures of THF. For the latter the den sities cover the composition range (0.2 less than or equal to x less t han or equal to 0.8) at the temperatures (288, 298, and 313)K and smal ler ranges of composition at higher temperatures. Isothermal compressi bilities, volume fluctuations, thermal expansivities, and the change i n isobaric heat capacity from its value at 0.1 MPa pressure have been calculated. Significant features on these properties are discussed. (C ) 1998 Academic Press Limited.