Equilibrium constants for the liquid-phase synthesis of isopropyl tert-butyl ether from 2-propanol and isobutene
- Univ. of Barcelona (Spain) Chemical Engineering Dept.
Equilibrium constants for the liquid-phase addition of 2-propanol to isobutene to give isopropyl tert-butyl ether (IPTBE) were determined experimentally in the temperature range 303--353 K and at 1.6 MPa. To reach etherification equilibrium, the macroporous sulfonic resin Bayer K-2631 was used as the catalyst. The UNIFAC estimates of activity coefficients were used to describe the liquid-phase nonideality. The thermodynamic equilibrium constants and the enthalpy, free energy, and entropy changes of the reaction were given as a function of temperature. At 298.15 K, the standard molar reaction enthalpy {Delta}{sub r}H{degree}{sub m}(298.15 K) is {minus}(22.9 {+-} 1.3) kJ/mol, in agreement with literature data, and the standard molar reaction entropy {Delta}{sub r}S{degree}{sub m}(298.15 K) and free energy {Delta}{sub r}G{degree}{sub m}(298.15 K) are {minus}(60.3 {+-} 0.5) J/mol{times}K and {minus}(4.9 {+-} 1.4) kJ/mol, respectively. Finally, at 298.15 K the standard molar enthalpy of formation {Delta}{sub f}H{degree}{sub m}(l, 298.15 K) and the standard molar entropy of IPTBE S{degree}{sub m}(l, 298.15 K) were estimated to be {minus}(378.5 {+-} 2.7) kJ/mol and 337.6 {+-} 1.5 J/(mol{times}K), respectively.
- Sponsoring Organization:
- DGICyT (Spain)
- OSTI ID:
- 458468
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 36, Issue 3; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermochemistry of uranium compounds: XVI, Calorimetric determination of the standard molar enthalpy of formation at 298.15 K, low-temperature heat capacity, and high-temperature enthalpy increments of UO{sub 2}(OH){sub 2} {center_dot} H{sub 2}O (schoepite)
Standard molar enthalpies of formation and transition at 298. 15 K and other thermodynamic properties of the crystalline and vitreous forms of arsenic sesquiselenide (As sub 2 Se sub 3 ): Dissociation enthalpies of As-Se bonds