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Phase equilbria for bio-derived chemicals

Michigan State University is actively pursuing reactive distillation for economical upgrading of bio-derived platform molecules to chemicals. To support the process design and scale-up, thermodynamic properties are measured and estimated. A P-x-y apparatus has been developed to collect binary VLE data for the multicomponent systems involved in reactive distillation for production of ethyl lactate, triethyl citrate, and diethyl succinate. The apparatus is capable of measuring VLE and VLLE at temperatures between 25C and 80C and pressures down to 0.7 kPa. Data pass either the area or point-to-point thermodynamic consistency tests. Systems measured include ethanol + ethyl lactate, water + ethyl lactate (maximum pressure azeotrope), ethanol + triethyl citrate, water + triethyl citrate (VLLE), ethanol + diethyl succinate. The use of the P-x-y method permits measurements of reactive systems at low temperature where insignificant reaction occurs. A T-x-y apparatus has been used to collect data for lactic acid + water, as well as selected multicomponent systems.