METHOD OF OXIDATIVE DEHYDRATION WITH IMPROVED REGULATIBILITY FOR OBTAINING BUTADIENE Russian patent published in 2017 - IPC C07C5/48 C07C11/167 

FIELD: chemistry.

SUBSTANCE: one of the process variants comprises the steps of providing a butene-enriched hydrocarbon feed, evaporating and superheating said butene-enriched hydrocarbon feed at a temperature of at least about 345°C (650°F), mixing said butene-rich hydrocarbon feed with superheated steam and oxygen-rich gas to form a reactor feed stream; providing a catalytic bed of oxidative dehydrogenation catalyst pellets, passing mentioned reactor feed stream from the inlet through said catalyst bed and forming a stream of a butadiene-rich product; providing a catalytic bed of oxidative dehydrogenation catalyst pellets, passing mentioned reactor feed stream from the inlet through said catalyst bed and forming a stream of a butadiene-rich product; providing mentioned catalytic oxidative dehydrogenation catalyst bed with a plurality of temperature sensing devices associated therewith for measuring the temperature in the bed in the direction of flow; controlling the inlet conditions of mentioned reactor such that oxidative dehydrogenation reactions initially take place in the layers of mentioned oxidative dehydrogenation catalyst most remote from said inlet, including reacting interaction with reactor feed stream with mentioned catalyst in the reaction zone and forming a butadiene-rich product stream; controlling the temperature over the length of the bed and occasionally increasing the temperature at the inlet so that the reaction zone migrates relative to said inlet in said oxidative dehydrogenation catalytic bed.

EFFECT: use of the proposed invention avoids the effects of oxygen leaking into the catalyst.

20 cl, 6 tbl, 8 dwg