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AssigneeDegussa AG
InventorsMathias Hoepp, Dietrich Arntz, Wolfgang Boeck, Andreas Bosse-Plois, Klaus Raible
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Process for the production of 2-vinyl-1,3-dioxolane reacting acrolein with ethylene glycol in the presence of a solid, acidic catalyst and recovery of the reaction mixture. Selectivity may be increased in comparison with known prior art processes by performing the reaction in the presence of a solid acidic catalyst at a temperature of below 50.degree. C.; the reaction mixture, from which the catalyst has been removed, is treated by extraction using an organic solvent which substantially does not dissolve ethylene glycol and has a boiling point of above 130.degree. C.; the two phases obtained on extraction are treated for recovery by distillation and recovered educts and the organic solvent are recycled.
A process for the production of 2-vinyl-1,3-dioxolane, comprising reacting acrolein with ethylene glycol at a temperature of below 50.degree. C. in the presence of a solid acidic catalyst to form a reaction mixture, removing said catalyst to form a catalyst-free reaction mixture, extracting said catalyst-free reaction mixture with an organic solvent wherein the resulting aqueous phase contains ethylene glycol and the resulting organic phase contains 2-vinyl-1,3-dioxolane.
A process for the production of 2-vinyl-1,3-dioxolane comprising continuously adding acrolein and ethylene glycol into an equilibrium reaction mixture containing 2-vinyl-1,3-dioxolane, ethylene glycol, acrolein and water to form a reaction mixture, passing said reaction mixture over an acidic fixed bed catalyst, discharging and extracting a quantity of said reaction mixture corresponding to said acrolein and said ethylene glycol to be distilled and recycling the remaining quantity of said reaction mixture;
Dependencies are inferred from the claim text.