Patent ID: 8957241
Filing Date: 2015-02-17
Classification: C07C,Y02P

Abstract:
1. A method for producing a carbonyl compound, comprising a step (X) of reacting a compound having a urea moiety of a formula (1) as shown below with a carbonic acid derivative selected from the group consisting of a carbonic acid ester, an N-unsubstituted carbamic acid ester, urea, and phosgene under heating at a temperature equal to or higher than the thermal dissociation temperature of the nitrogen-carbonyl bond to obtain the carbonyl compound; wherein the step (X) is carried out in a distillation column comprising a supply port A, a supply port B and a discharge port C, the step X comprising: supplying raw material ingredients containing the compound having the urea moiety, or raw material ingredients containing a precursor of the compound having the urea moiety, to the distillation column via at least the supply port A, supplying the carbonic acid derivative to the distillation column via at least the supply port B, and recovering a generated mixture comprising the carbonyl compound via at least the discharge port C disposed at a lower part of the distillations column; and the supply port B is disposed at a position the same as or lower than the supply port A, the discharge port C is disposed at a position the same as or lower than the supply port B, and a temperature of the distillation column at a height of the supply port B is equal to or higher than the thermal dissociation temperature of the nitrogen-carbonyl bond in the compound having the urea moiety.