| 摘要 |
<p>A process for vapor-phase catalytic oxidation by feeding a gaseous raw material into a fixed-bed multi-pipe reactor comprising reaction pipes filled with catalysts, wherein two or more catalyst layers different in activity are placed in each reaction pipe in a state stratified in the reaction direction and the catalyst layer nearest to the port of feeding the gaseous raw material has a higher catalytic activity than that of the next catalyst layer adjacent thereto; and a process for production of (meth)acrolein or (meth)acrylic acid by vapor -phase catalytic oxidation of a raw material for production of (meth)acrolein or (meth)acrylic acid with molecular oxygen or a gas containing molecular oxygen in a fixed-bed multi-pipe reactor comprising reaction pipes each containing two or more catalyst layers placed in the axial direction, wherein the difference between the maximum and minimum reaction peak temperatures of each catalyst layer in the pipe-axial direction is controlled to be 20 °C or below. According to these processes, the occurrence of hot spots can be efficiently inhibited.</p> |
