METHOD FOR PRODUCING OPTICALLY ACTIVE, RACEMIC MENTHOL
申请人:Heydrich Gunnar
公开号:US20100249467A1
公开(公告)日:2010-09-30
The present invention relates to a particularly economic overall method for producing menthol, specifically for producing optically active, essentially enantiomerically and diastereomerically pure L-menthol and racemic menthol, starting from the starting material citral which is available inexpensively on an industrial scale. The method comprises the following steps
a.1) catalytic hydrogenation of neral and/or geranial to give citronellal,
b.1) cyclization of citronellal to isopulegol in the presence of an acidic catalyst,
c.1) purification of isopulegol by crystallization and
d.1) catalytic hydrogenation of isopulegol to give menthol.
Kontinuierliches Verfahren zur Herstellung von Neral in reiner oder angereicherter Form
申请人:BASF SE
公开号:EP2008989A1
公开(公告)日:2008-12-31
Die vorliegende Erfindung betrifft ein kontinuierliches Verfahren zur Herstellung von Neral (cis-Citral) in reiner oder angereicherter Form durch destillative Abtrennung von Neral aus Stoffgemischen die im wesentlichen Neral und Geranial (trans-Citral) enthalten. Dabei wird die destillative Abtrennung in einer Trennwandkolonne oder in einer Zusammenschaltung von zwei Destillationskolonnen in Form einer thermischen Kopplung vorgenommen.
Kontinuierliches Verfahren zur Herstellung von Neral in reiner Form
申请人:BASF SE
公开号:EP2162418B1
公开(公告)日:2015-11-11
VERFAHREN ZUR HERSTELLUNG VON OPTISCH AKTIVEM UND RACEMISCHEM MENTHOL
申请人:BASF SE
公开号:EP2225192B1
公开(公告)日:2017-05-03
CONTINUOUS PROCESS FOR PREPARING NERAL IN PURE OR ENRICHED FORM
申请人:Heydrich Gunnar
公开号:US20100193348A1
公开(公告)日:2010-08-05
The present invention relates to a continuous process for preparing neral (cis-citral) in pure or enriched form by distillatively separating neral from substance mixtures comprising essentially neral and geranial (trans-citral). This distillative separation is performed in a dividing wall column or in a connection of two distillation columns in the form of a thermal coupling.