| 摘要 |
PURPOSE:To advantageously obtain the title compound from >= 4C aliphatic hydrocarbon using a specific fluid bed catalyst by returning the catalyst recovered in a cyclone to a reoxidation zone provided in the lower region of a thick fluid layer and simultaneously controlling inlet temperature of the cyclone. CONSTITUTION:When >= 4C aliphatic hydrocarbon is subjected to catalytic vapor phase oxidation by an oxygen-containing gas fed from the lower part of a gas dispersing plate 2 in a fluid bed reactor 1 providing the gas dispersing plate 2 at the bottom, forming a thick fluid layer 1 consisting of an oxidation catalyst using a V-P based complex oxide as an active catalyst above the plate 2 and providing cyclones 12 and 13 for recovering a scattering catalyst at the top to provide the title compound, the above-mentioned raw material is fed to the position 7 separated apart from the above of the dispersing plate 2 in the lower region of the fluid layer 5 and simultaneously substantial part of the recovered catalyst is returned to the lower region of a flow stream layer 5. Further, a heat exchanger 11 is installed in a dilute fluid layer 10 above the fluid layer 5 and the inlet temperature of the cyclones 12 and 13 is controlled to 330-450 deg.C to suppress non-catalyst oxidation, secure the safeness and simultaneously reduce the loss of product. |
