| abstract |
A process for the catalytic gas phase oxidation of propene to acrylic acid, in which the reaction gas starting mixture is oxidized with an increased propene load in a first reaction stage on a first fixed bed catalyst which is accommodated in two successive reaction zones A, B, the reaction zone B being at a higher temperature than that Reaction zone A is maintained, and then the acrolein-containing product gas mixture of the first reaction stage is oxidized in a second reaction stage under an increased acrolein load on a second fixed bed catalyst which is accommodated in two successive reaction zones C, D, the reaction zone D being at a higher temperature than the reaction zone C is held. |