Process for the production of nitriles and oxides

Details Process for the production of nitriles and oxides Process for the production of nitriles and oxides

C - Chemistry, Metallurgy

07

C

23/47, 260/562.6

C07C 253/26 (2006.01) B01J 19/00 (2006.01) C01C 3/02 (2006.01) C07C 253/34 (2006.01) C07C 255/08 (2006.01) C07D 301/08 (2006.01)

Patent

CA 2007824

An improved process is provided for the production of nitriles and oxides from hydrocarbons by reaction with oxygen, air or a gas enriched in oxygen relative to air, preferably the latter, and ammonia where a nitrile is desired, in the presence of a suitable catalyst. An alkane, e.g. propane, is converted to an alkene in a catalytic dehydrogenator. The product stream is intro- duced into an ammoxidation/oxidation reactor. The product formed therein is recovered in a conventional quench tower. The pressure of the gaseous effluent from the quench tower is raised and it is introduced into an absorber/stripper unit to form a recycle stream containing unreacted alkane and alkene as well as a minor amount of oxygen, typically 1-2 percent by volume, and a waste stream comprising the remainder of the quench tower gaseous phase. The recycle stream is introduced into a selective oxidation unit to remove the oxygen therefrom and then recycled to the dehydrogenator. Flammability of the quench tower gaseous effluent and the waste stream from the absorber/stripper is minimized by assuring that the nonflammability index (NFI) thereof is within certain limits. The desired NFI is related to the total hydro- carbon content of the stream and may be achieved, if required, by the addition thereto of a gaseous flame sup- pressor. The gaseous flame suppressor is removed with the absorber/stripper unit waste stream which may advan- tageously be combusted to provide energy for the process. A PSA unit may be utilized to remove excess hydrogen from the dehydrogenator effluent. The dehydrogenator may be a multistage dehydrogenator.

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