Patent ID: 9550709
Date: 2017-01-24
CPC Classifications: B01J,C07C,Y02P

Claim:
1. A process for the catalytic oxidative dehydrogenation of one or more C 2-4 alkanes comprising at least two pre-reactors and one or more downstream main oxidative dehydrogenation reactors comprising: i) passing a feed stream comprising said one or more C ii) reacting the feed stream with the dehydrogenation catalyst that is saturated with reactive oxygen at a temperature from about 300° C. to about 500° C. and a pressure from about 0.5 to about 100 psig to produce a partially dehydrogenated stream comprising unreacted C iii) passing the partially dehydrogenated stream together with additional oxygen feed to one or more downstream main oxidative dehydrogenation reactors; iv) oxidatively dehydrogenating the partially dehydrogenated stream at a temperature from about 300° C. to about 500° C. and a pressure from about 0.5 to about 100 psig to produce a product stream; v) removing the product stream from said one or more downstream main oxidative dehydrogenation reactors comprising corresponding C vi) passing the product stream through a second pre-reactor comprising a second dehydrogenation catalyst that is depleted of reactive oxygen; vii) reacting the product stream, with the dehydrogenation catalyst depleted of reactive oxygen at a temperature from about 50° C. to about 270° C. and a pressure from about 0.5 to about 100 psig to complex the oxygen depleting oxygen from the product stream and regenerating oxidative dehydrogenation catalyst by increasing the saturation with reactive oxygen; and viii) recovering a product stream depleted of oxygen; ix) continuing step (i) to (viii) until either: x) when condition (a) is achieved the feed stream is diverted from the first pre-reactor to another pre reactor comprising a dehydrogenation catalyst that is saturated with reactive oxygen and the process continues from step (ii) on; xi) when condition (b) is achieved the product stream is diverted from the second to another pre reactor comprising a second dehydrogenation catalyst depleted of reactive oxygen and the process continues from step (viii) on.