Separating mixture comprising ethylene glycol and 1,2-butanediol, useful e.g. to form lubricants, comprises distilling mixture with azeotropic agent comprising (1,3)dioxolane compound and distilling material flow to obtain ethylene glycol

摘要

Separating a mixture comprising ethylene glycol and 1,2-butanediol, comprises: distilling the mixture with an azeotropic agent comprising a [1,3]dioxolane compound (I) to obtain a material flow comprising ethylene glycol and azeotropic agent, where the material flow is held steady to delaminate and to separate the mixture enriched in ethylene glycol; and further distilling the mixture to obtain ethylene glycol. Separating a mixture comprising ethylene glycol and 1,2-butanediol, comprises: distilling the mixture with an azeotropic agent comprising a [1,3]dioxolane compound of formula (I) to obtain a material flow comprising ethylene glycol and azeotropic agent, where the material flow is held steady to delaminate and to separate the mixture enriched in ethylene glycol; and further distilling the mixture to obtain ethylene glycol. R1, R2 : H or 1-4C, preferably 1-2C-alkyl; and R3, R4 : H or 1-8C, preferably 1-5C-alkyl. [Image].