Method for production of 1,6-hexanediol with a purity in...

Details Method for production of 1,6-hexanediol with a purity in... Method for production of 1,6-hexanediol with a purity in...

2005-07-07

2008-11-11

Price, Elvis O (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

Reexamination Certificate

active

07449609

ABSTRACT:
The present invention provides a process for preparing 1,6-hexanediol by hydrogenating dialkyl adipates, alkyl 6-hydroxycaproates, 1,4-cyclohexanedione and 4-hydroxycyclohexan-1-one as ester mixtures comprising impurities, bya) freeing resulting the esterification mixture of excess alcohol and low boilers in a first distillation stage (alcohol removal),b) carrying out a separation of the bottom product in a second distillation stage into an ester fraction substantially free of 1,4-cyclohexanediols and a fraction comprising at least the majority of the 1,4-cyclohexanediols,c) catalytically hydrogenating the ester fraction substantially free of 1,4-cyclohexanediols (ester hydrogenation) andd) in a purifying distillation stage, obtaining 1,6-hexanediol from the hydrogenation effluent in a manner known per se,which comprises selectively hydrogenating the ester mixture before stage a) and/or before stage b) (purifying hydrogenation).

REFERENCES:
patent: 5981769 (1999-11-01), Bauer et al.
patent: 6008418 (1999-12-01), Bauer et al.
patent: 196 07 954 (1997-09-01), None
patent: 196 07 955 (1997-09-01), None
patent: WO 97/31882 (1997-09-01), None
patent: WO 2004/046072 (1997-09-01), None
patent: WO 2004/026798 (2004-04-01), None
Ullmann's Encyclopedia of Industrial Chemistry, 1989.

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