Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-07-11
1977-06-21
Garner, Vivian
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260533N, 260533R, 260597R, 260604R, C07C 5132
Patent
active
040311350
ABSTRACT:
In the oxidation of propylene to acrylic acid in the gas phase in two spatially separate oxidation stages, a part of the off-gas, which has been freed from condensable products, is fed to the oxidation stages in addition to freshly charged propylene and air, under the following conditions:
A. The recycled off-gas and air are in part fed to the first oxidation stage and in part to the second oxidation stage,
B. The molar ratio of propylene : oxygen : residual gases fed to the first stage is 1 : 1.5-2.3 : 11-19,
C. The molar ratio of the total propylene fed in, to the total oxygen fed in, in the form of air or off-gas, before and after the first stage, and to the total residual gases fed in is 1 : 1.9-2.5 : 13-25, with the proviso that
D. The air and the recycled off-gas are divided between the two feed points in such a way that from 10 to 50% by volume of the total quantity of air and off-gas fed in are added after the first stage and
E. The air and off-gas are admixed to the reaction gas mixture after the first stage, immediately after it leaves the catalyst zone, so that the mixture is rapidly cooled to a temperature of from 150.degree. to 320.degree. C.
REFERENCES:
patent: 3801634 (1974-04-01), Krabetz et al.
Duembgen Gerd
Engelbach Heinz
Krabetz Richard
Lebert Ulrich
Thiessen Fritz
BASF - Aktiengesellschaft
Garner Vivian
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