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US 8,282,793 B2Granted
Continuous process for preparing neral in pure or enriched form
AssigneeBASF SE
InventorsGunnar Heydrich, Nawid Kashani-Shirazi, Christoph Jäkel, Joachim Schmidt-Leithoff
Life of this patent
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Abstract
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.
Claims17
A continuous process for preparing neral of the formula (I)
- in pure form which comprises distillative separation of a neral from a substance mixture comprising neral and geranial of the formula (II)
- wherein the distillative separation is performed in a dividing wall column or in a connection of two distillation columns in the form of a thermal coupling with from 80 to 200 theoretical plates and one or more side draws at an absolute operating pressure of from 5 to 200 mbar, and wherein the substance mixture consists to an extent of from 30 to 70% by weight of neral, to an extent of from 70 to 30% by weight of geranial and to an extent of from 0 to 5% by weight of further components, where the percentages do not exceed 100% by weight.
Dependencies are inferred from the claim text.