Patent ID: 9340472
Filing Date: 2016-05-17
CPC Classification: B01J,C07C,Y02P

Claim Text:
1. A method for producing a conjugated diene, comprising: feeding a raw material gas comprising a monoolefin having a carbon atom number of 4 or more and a molecular oxygen-containing gas in a heat-exchange-type reactor having a molybdenum-containing metal oxide catalyst; and performing an oxidative dehydrogenation reaction while removing reaction heat with a coolant, thereby producing a corresponding conjugated diene, wherein an amount of molybdenum adhered onto a cooling heat transfer surface within the reactor is kept at not more than 20 mg/m wherein a surface roughness Ra of a cooling heat transfer surface within the reactor is not more than 3 μm, and a temperature difference between a reaction temperature and a coolant temperature is in a range from 5 to 220° C.