反应详情

In a flask (capacity: 1 liter; connected to a plate column) were fed 3,5,5-trimethylcyclohexa-2-en-1-one (553 g) and adipic acid (38 g). Isomerization was carried out under a pressure of 340 Torr with a temperature (liquid phase) of 190° C. in the flask, while controlling the charge (supply) of 3,5,5-trimethylcyclohexa-2-en-1-one to keep the temperature at 154° C. at the top of the column, and simultaneously, continuous distillation was effected using a distilling column "Order show" equipped with 30 plates, adjusting the liquid level in the flask at a predetermined level. As a result, 3,5,5-trimethylcyclohexa-3-en-1-one was constantly obtained from the top of the column in 25 g per hour, its concentration being 99% or higher (analysed by gas chromatography).

1. customwas carried out under a pressure of 340 Torr with a temperature (liquid phase) of 190° C. in the flask
2. customat 154° C.
3. distillationsimultaneously, continuous distillation
4. customequipped with 30 plates