Equilibrium constants for the liquid-phase synthesis of methyl ferf-butyl ether (MTBE) were determined experimentally In the temperature range 40-80 °C. Equilibrium was established In the methanol addition to Isobutylene for obtaining MTBE over the sulfonic acid resin Lewatlt SPC 118 as the catalyst In a batch reactor maintained at 1.8 MPa. The experimental equilibrium constant Is given as a function of temperature, and enthalpy, free energy, and entropy changes have been determined as well. At 298 K, H°= -38.0 ± 0.8 kJ mol'1, AG°= -13.8 ± 0.8 kJ mol"1, and AS0 = -81.7 ± 0.5 J mol-1 K'1. The UNIFAC estimates of activity coefficients have been used to describe the liquid-phase nonideality. A comparison of experimental, thermodynamic, and literature data has been carried out.

The liquid-phase addition of ethanol to isobutene to give ethyl tert-butyl ether (ETBE) on the ion exchange resin Lewatit K2631 has been studied. Rate data were obtained free of mass transfer influence in a continuous differential reactor operated at 1.6 MPa and 40-90 "C, measuring steadystate conversions

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