| abstract |
The present invention comprises hexanedioic acid, 6-hydroxy caproic acid and a small amount of 1,4 cyclohexane diol and contains water from the reaction mixture during oxidation of cyclohexane to cyclohexanone / cyclohexanol using oxygen or an oxygen containing gas. From the mixture of the carboxylic acid obtained by extracting, it relates to a method for producing 1,6 hexanediol by esterification of acid and subsequent hydrogenation. According to the invention, the alcohol is separated from the mixture of alcohol and low boilers obtained after esterification and / or hydrogenation by means of a membrane system and the alcohol is regenerated in an esterification step. |