Process and apparatus for production of 5-cyclohexadecen-1-one

摘要

This invention relates to a process for producing 5-cyclohexadecen-1-one continuously from 1,2-divinylcyclododecanol in a short time in an efficient manner without no side reaction. In the process, 1,2-divinylcyclododecanol as starting material is supplied from a raw material container 1 by a fixed delivery pump 2 to a flash unit 3 which is vacuumed to 5 mm Hg (666.5 Pa) or less by a vacuum pump 8 and is heated and 1,2-divinylcyclododecanol which is flashed in the flash unit is supplied to a reactor 4 which is heated to 400 to 650 DEG C and vacuumed to 5 mm Hg (666.5 Pa) or less whereby 1,2-divinylcyclododecanol is converted into 5-cyclohexadecen-1-one. The reaction product is discharged from the top of the reactor and is cooled to recover the objective 5-cyclohexadecen-1-one in the recovery container 6. The reduction in the pressure of the apparatus is preferably performed by a vacuum pump 8 via a hydrochloric acid trap 7 comprising, for example, sodium methylate/methanol cooled to -78 to -100 DEG C.