The low-temperature heat capacity and ideal gas thermodynamic properties of isobutyl tert-butyl ether

The thermodynamics of vaporization of ethyl tert-butyl ether, isobutyl tert-butyl ether, and di-isopropyl ether

“…Chromatographic analysis was carried out on a gasliquid chromatograph with a flame ionization detector, a capillary column with stationary phase SE-30 being used. According to g.l.c., the DIPE sample had a mass fraction of 0.9996, in good agreement with the value 0.9991 obtained by a fractional melting study on the analogy of [6].…”

“…The third sample of the ETBE having a mole fraction of 0.9991 was used for ebulliometric and heat capacity [5] studies. According to the fractional melting study of IBTBE [6], the sample under study had the mole fraction of 0.9992 in good agreement with the value of 0.9992 obtained by g.l.c.-analysis.…”

“…The densities were determined by means of a quartz pycnometer (volume 1 cm 3 ) with accuracy ±4 AE 10 À4 g AE cm À3 . Table 5 lists the densities, thermodynamic properties calculated from the equations (4) to (6), and corresponding literature data for the substances under study. TABLE 4 Coefficients of equations (4) to (6) for di-isopropyl ether (I), propane,2-ethoxy-2-methyl (II), and propane,1-(1,1-dimethylethoxy)-2-methyl (III) [11] Fisher's criteria and that estimated from equation (7), respectively.…”

“…Then the ethers were distilled at a reduced pressure. In preparation of the pure tertiary ethers, g.l.c.-analysis and also adiabatic calorimetry [5,6] had been used for determination of the impurity contents. Table 1 and figure 1 show the impurity decreasing and, respectively, qualitative change of the fractional melting curves of ETBE samples during their purification by blowing off dissolved isobutylene.…”

“…The vapour pressure of DIPE was obtained in the temperature range from (284.8 to 365.1) K with accuracy ±0.01 K, the appropriate pressure interval being equal to (from 10.7 to 201.8) kPa. References [5,6] reported our determination of the low-temperature heat capacities and ideal thermodynamic properties of ETBE, tert-amyl ethyl ether (TAEE) {2-ethyl-2-ethoxypropane}, and IBTBE, respectively.…”