03988423 is referenced by 14 patents and cites 3 patents.

A method for removing efficiently and economically harmful materials from a waste gas exhausted in a process for producing acrylonitrile by ammoxidation of propylene, which comprises dividing the waste gas exhausted after the absorption of acrylonitrile into two flows, mixing the first flow gas with air in an amount necessary for combustion of the combustible gas contained in the whole waste gas, subjecting the main flow gas of the mixed gas thus obtained to heat-exchange with the gas of the outlet of the first catalyst layer, combining the main flow gas with the remainder of the mixed gas, preheating thereby the mixed gas at a temperature of 200.degree. to 450.degree. C, passing the preheated mixed gas through the first catalyst layer wherein at least one noble metal is dispersed on an alumina carrier, and therein burning the gas at a temperature of 650.degree. to 750.degree. C in the presence of an excess amount of oxygen to give a combustion gas, combining the combustion gas with the second flow gas which is preheated by subjecting the main flow gas of the second flow gas to heat-exchange with the gas of the outlet of the second catalyst layer and combining the main flow gas with the remainder of the second flow gas, and thereby controlling the temperature of the combustion gas to 250.degree. to 450.degree. C, passing the combustion gas combined with the second flow gas through the second catalyst layer, and therein burning the gas at a temperature of the outlet of 600.degree. to 750.degree. C in a concentration of the remaining oxygen of 0 to 0.5 % by volume.

Title
Method for removing harmful materials from waste gas
Application Number
5/514081
Publication Number
3988423
Application Date
October 11, 1974
Publication Date
October 26, 1976
Inventor
Masaaki Iwasa
Niihama
JA
Osamu Imai
Niihama
JA
Tetsuo Hoshikuma
Niihama
JA
Yasuhito Sakakibara
Saijo
JA
Tetsuya Ohrui
Niihama
JA
Agent
Stewart and Kolasch
Assignee
Sumitomo Chemical Company
JA
IPC
A62D 3/00
B01D 53/34
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