Patent Number: 6,169,211

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

Abstract: Disclosed is a process for producing 5-cyclohexadecen-1-one continuously from 1,2-divinylcyclododecanol in a short time in an efficient manner without side reactions. In the process, 1,2-divinylcyclododecanol as a starting material is supplied from a raw material container 1 by a dosage pump 2 to a flash unit 3 which is set under a vacuum of 5 mm Hg or less by a vacuum pump 8 and is heated. 1,2-Divinylcyclododecanol which is flashed in the flash unit is supplied to a reactor 4 which is heated to 400 to 650.degree. C. and is set under a vacuum of 5 mm Hg 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.degree. C.

Inventors: Yagi; Misao (Hiratsuka, JP), Itakura; Keisuke (Hiratsuka, JP), Yamamoto; Kenichi (Hiratsuka, JP), Amano; Akira (Hiratsuka, JP)

Assignee: Takasago International Corporation

International Classification: C07C 49/587 (20060101); C07C 45/00 (20060101); C07C 45/51 (20060101); C07C 49/00 (20060101); C07C 049/547 ()

Expiration Date: 01/02/2018