Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.
Reexamination Certificate
2008-06-17
2008-06-17
Nguyen, Tam M. (Department: 1797)
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By addition of extraneous agent, e.g., solvent, etc.
C208S240000, C208S291000
Reexamination Certificate
active
07388121
ABSTRACT:
The invention relates to a process to separate butadiene dimers from a mixture comprising butadiene dimers and alkyl-3-pentenoate and/or isomers thereof wherein the butadiene dimers are separated from said mixture by distillation in the presence of an alcohol and in that the distillation is effected at a bottom temperature of between 80 and 200° C. Examples of frequent occurring butadiene dimers are 4-vinylcyclohexene and 1,3,7-octatriene. Examples of the alcohol are monohydroxy aliphatic alcohols.
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patent: 4259520 (1981-03-01), Summer
patent: 5495041 (1996-02-01), Sielcken et al.
patent: 5693851 (1997-12-01), Sielcken et al.
patent: 6010975 (2000-01-01), Liu
patent: 95/06027 (1995-03-01), None
Doelman Michael S
Hangx Gerardus Wa
Smits Hubertus A
Tinge Johan T
DSM IP Assets B.V.
Nguyen Tam M.
Nixon & Vanderhye P.C.
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