Preparation of diacetals of glyoxal
AssigneeBASF SE
InventorsGunnar Heydrich, Nicola Christiane Aust, Hermann Pütter, Andreas Fischer, Jörg Botzem
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Abstract
A process is described for preparing diacetals of glyoxal by reacting from 40 to 75% by weight aqueous glyoxal with monohydric alcohols in the presence of an acid catalyst, which comprises leaving a liquid mixture which, at the beginning of the reaction, comprises alcohol and glyoxal in a molar ratio of at least 15:1 and also water in a concentration of not more than 8% by weight in contact with the acid catalyst until concentration in the reaction mixture of the diacetal formed reaches at least 70% of the equilibrium concentration without more than 5% by weight of the alcohol used having already been distilled off.
Claims14
A process for preparing 1,1,2-tetramethoxyethane or 1,1,2,2-tetraethoxyethane by reacting from 40 to 75% by weight aqueous glyoxal with methanol or ethanol in the presence of an acid catalyst, which comprises contacting a liquid mixture which, at the beginning of the reaction, comprises the methanol or ethanol and glyoxal in a molar ratio of at least 15:1 and also water in a concentration of not more than 8% by weight with the acid catalyst until concentration in the reaction mixture of the diacetal formed reaches at least 70% of the equilibrium concentration without more than 5% by weight of the methanol or ethanol used having already been distilled off.
Dependencies are inferred from the claim text.