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US 5,177,265 AGranted
Process for the preparation of citral
AssigneeRhone-Poulenc Sante
InventorsPierre Chabardes, Jacques Chazal
Life of this patent
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Abstract
An improved method for preparing citral in liquid phase from prenol and prenal, wherein, in a single reaction enclosure, the prenol and prenal are condensed in the presence of a mineral acid at a concentration of about 5.10.sup.-3 mole for one mole of prenal, 90 to 95% of the acid is neutralized, and once excess prenal and prenol is eliminated, the citral is distilled.
Claims5
A process for the preparation of citral starting from prenal and prenol, characterized in that,
- in the same reaction space,
- in a first step, the condensation of prenal with prenol is carried out in a liquid phase in the presence of a solvent forming an azeotrope with water and a mineral acid at a concentration of approximately 5.times.10.sup.-3 mol per mole of prenal,
- in a second step, 90 to 95% of the mineral acid is neutralized and
- in a third step, after elimination of the prenal and prenol which have not reacted, the citral is distilled off.
1 more element
Dependencies are inferred from the claim text.