METHOD OF OBTAINING AN UNSATURATED ALDEHYDE AND/OR UNSATURATED CARBOXYLIC ACID Russian patent published in 2017 - IPC C07C27/12 C07C45/35 C07C47/22 C07C51/215 C07C57/55 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method of receipt of acrolein and acrylic acid or methacrolein and methacrylic acid, which effect on propylene or, at least, on one type of compounds selected from the group consisting of isobutylene tertiary butanol, as has a contact oxidation using gas containing molecular oxygen, using a fixed bed multitube reactor, where (A) provide many layers of catalyst formed by division of catalyst layer in layer N (N is an integer equal to or greater than 2) in the direction of flow of gaseous source materials in reaction tubes. And among segments of the catalyst layer of catalyst, which is located on the near side of the input reactive gas is defined as Zin, while catalyst layer located at the farthest outlet side reactive gas is defined as Zout, and (B) catalyst downloaded so that load into catalyst activity Zout, higher than loaded catalyst activity in Zin, and thus that is satisfied by the following equation (1): 0.5≤ (Cmax-Ccrs) (1), where Cmax is the degree of transformation of source materials in which the desired output product becomes maximum; Ccrs and represents the degree of transformation of raw materials where high/low ratio between the Tin and Tout changes to reverse when the maximum temperature layer of the catalyst Zin is defined as Tin, and the maximum temperature of the catalyst bed Zout is defined as Tout, and the conversion of the starting materials varies.

EFFECT: method enables stable work process over an extended period of time.

9 cl, 7 ex