Excess enthalpies of mixtures containing n-heptane, methanol and methyl tert-butyl ether (MTBE)

Excess thermodynamic properties of binary and ternary mixtures containing methyl 1,1-dimethylethyl ether (MTBE), -heptane, and methanol at= 313.15 K

“…As for the prediction of the miscibility gap for {x 1 CH 3 OH + (1 − x 1 )CH 3 (CH 2 ) 5 CH 3 }, the values obtained with the five-parameter Margules equation are x 1 = 0.2263, and x * 1 = 0.8714, and are close to the literature values: x 1 = 0.2248, and x * 1 = 0.8567 (reported by Tusel-Langer et al (28) ), x 1 = 0.2536, and x * 1 = 0.8486 (Tagliavini et al (29) ), and x * 1 = 0.8462 (Kiser et al (30) ). Support for this work came from the DGICYT, Dirección General de Investigación Científica y Técnica of the Spanish Ministry of Education, Project PB95-0704, and from Junta de Castilla y León (Consejería de Educación y Cultura) project VA 42/96.…”

“…They are presented in table 9, and compared with the few experimental results found in the literature. (28)(29)(30) The results for the ternary system are shown in figures 2 to 5. Constant pressure lines are shown in figure 2, constant excess molar Gibbs energy lines G E m in figure 3, and pressure and excess molar Gibbs energy surfaces in figures 4 and 5, respectively.…”

“…The experimental data for {x 1 (27) and the excess molar entropy S E m is calculated from the thermodynamic relation (28)(29)(30) We have not been able to make measurements in this region of the (vapour + liquid + liquid) equilibrium because the technique is not adequate for very low mole fractions. The pressure surface, figure 4, shows a maximum at 66.238 kPa which corresponds to the azeotrope {x 1 CH 3 OC(CH 3 ) 2 CH 3 + (1 − x 1 )CH 3 OH}, and a minimum at 12.331 kPa corresponding to the pressure of pure n-heptane.…”

Excess molar volumes and enthalpies of { an alkanol +tert -amyl methyl ether ( TAME )}

“…In previous papers, experimental excess molar enthalpy H E data of binary and ternary mixtures containing major members of the ether oxygenate family proposed as octane number enhancers have been reported: MTBE (methyl tert-butyl ether), (1,2) ETBE (ethyl tert-butyl ether) (3) or TAME (tert-amyl methyl ether) (4,5) as well as experimental excess volumes V E and excess heat capacities C E p of binary, ternary and quaternary mixtures containing ETBE. (6,7) The ERAS (Extended Real Associated Solution) model has been b To whom correspondence should be addressed (E-mail: R. Lichtenthaler@urz.uni-heidelberg.de).…”

Excess enthalpies for (propanone + 1,1-dimethylethyl methyl ether) and methanol + propanone + 1,1-dimethylethyl methyl ether) at the temperature 298.15 K

“…The thermodynamic properties of mixtures containing 1,1-dimethylethyl methyl ether thus seemed to us to be an interesting topic for study. The excess molar enthalpies H E m of the following binary and ternary mixtures containing 1,1-dimethylethyl methyl ether: {xC 6 (9) The experimental errors of measured variables were 20.005·H E m , 20.00005·x, and 21 mK in temperature T.…”