FIELD: chemistry.
SUBSTANCE: invention relates to an improved method for long-term heterogeneous catalytic partial gas-phase oxidation of an organic starting compound selected from propylene, isobutene, acrolein, methacrolein, propane or isobutane, to the desired organic compound, where the starting gaseous reaction mixture, containing the organic starting compound and molecular oxygen, is first passed through a freshly loaded sold catalyst layer which is filled with separation into two temperature zones A and B, lying in space one behind the other, temperature TA of which is such that the difference ΔTBA between temperature TB of zone B and temperature TA of zone A, which is calculated by taking the greater of the two values as the minuend, is greater than 0°C, such that the starting reaction mixture of gases successively flows through temperature zones A, B, first through A and then B, where temperature zone A extends until conversion of the organic starting compound UA = 15-85 mol %, and in temperature zone B conversion of the organic starting compound increases to a value UB ≥ 90 mol %, and as the operating life increases, temperature of zones A, B is changed in order to compensate for deterioration of quality of the solid catalyst layer, where as the duration of operation increases, temperature of that temperature zone which initially had a lower value, is raised, and the difference ΔTBA between temperature values of both zones is lowered, such that when calculating the difference, temperature of that zone which was initially the higher value, remains as the minuend.
EFFECT: compensating for the deterioration of quality of the solid catalyst layer with long operating life.
21 cl, 1 tbl
