Abstract
The kinetics of glycerol transacetalization with 1,1-diethoxyethane in ethanol over Amberlyst-15 cationic exchange resin catalyst at 25–40°C have been investigated. The reaction must be run with DEE as the limiting reactant to avoid over-acetalization of glycerol, and below 50°C to avoid formation of byproducts from DEE such as ethyl vinyl ether. A second order kinetic model describes the transacetalization reaction satisfactorily with a rate constant of 1.1×10−4m6/kmol/kgcat/s at 40°C and an activation energy of 58.6kJ/mol. The equilibrium constant for the reaction is 900kmol/m3 at 40°C, and the heat of reaction is estimated at −20.6kJ/mol. The reverse reaction has little influence on rate at reactant conversions less than 50%. The model and reaction conditions identified provide a framework to develop and better understand processes for glycerol acetalization.
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