EQUILIBRIUM CONSTANTS FOR ETHYL tert-BUTYL ETHER LIQUID-PHASE SYNTHESIS |
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Authors: | Meritxell Vila Fidel Cunill Jos -Felipe Izquierdo Javier Tejero Montserrat Iborra |
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Affiliation: | a Chemical Engineering Department, University of Barcelona, Barcelona, Spain |
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Abstract: | Thermodynamic equilibrium constants for the liquid-phase synthesis of ethyl terl-butyl ether (ETBE) were determined experimentally in the temperature range 40-80°C (313-353 K) at 1.6 MPa for an initial molar ratio of ethanol to isobutene ranging from 1 to 1.5. To reach etherification equilibrium a macroporous sulphonic acid resin (K-2631, Bayer) was used as a catalyst. The thermodynamic equilibrium constant and the enthalpy, free energy, and entropy changes are given as a temperature function. At 298 K, ΔH° = -34.8 kj mol-1, ΔG° = -11.7kJmol-1, and ΔS° = -77.3J mol-1 K-1. A comparison with the values obtained for MTBE is also included. |
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Keywords: | Ethyl tert-butyl ether synthesis Isobutene Ethanol ETBE equilibrium synthesis |
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