Method for distilling mixtures containing butanediol
AssigneeBASF SE
InventorsRolf Pinkos, Rolf Fischer, Shelue Liang
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Abstract
A process for the separation by distillation of a mixture of 1,4-butanediol and at least one 4-hydroxybutyraldehyde, its cyclic hemiacetal and its cyclic full acetals with at least one further alcohol by carrying out the distillation in the presence of an alkaline compound. The mixture to be separated preferably contains a cyclic full acetal of 4-hydroxybutyraldehyde with a further alcohol which has a lower boiling point than butanediol and also the further alcohol in free form. The process is particularly suitable for the separation by distillation of mixtures formed in the hydrogenation of maleic acid derivatives.
Claims6
A process for the separation by distillation of 1 ,4-butanediol from a mixture obtained in the catalytic hydrogenation of maleic acid derivatives, said mixture comprising 1,4-butanediol and at least one further compound selected from the group consisting of 4-hydroxybutyraldehyde, its cyclic hemiacetal and its cyclic full acetals with at least one further alcohol, wherein the distillation is carried out in the presence of an alkaline compound and a 1,4-butanediol whereby a reduced 2-(4-hydroxybutoxy) tetrahydrofuran content is obtained.
Dependencies are inferred from the claim text.