Patent RU-2379105-C2 (RU)
Inventor: KOVALESKI RUT MEHRI
IPC: C07C5/333
Filed: 2005-11-16
Granted: 2010-01-20
Abstract: FIELD: chemistry. 
     SUBSTANCE: present invention relates to dehydrogenation catalysts, their preparation and use. Described is a dehydrogenation catalyst composition based on iron oxide which includes an iron oxide component with low concentration of titanium, where the said iron oxide component is obtained through thermal treatment of a residue of yellow iron oxide prepared via precipitation from a solution of an iron salt, and where the said dehydrogenation catalyst composition based on iron oxide has first titanium concentration which is less than approximately 300 parts per million. Also described is a method of preparing a dehydrogenation catalyst based on iron oxide, with a first titanium oxide concentration less than approximately 300 parts per million, with the said method involving: obtaining a component in form of red iron oxide with low content of titanium, through thermal treatment of a residue of yellow iron oxide prepared by via precipitation of from a solution of an iron salt, where the said yellow iron oxide has a second titanium concentration; mixing the said component in form of red iron oxide with an additional component of the dehydrogenation catalyst and water with formation of a mixture; moulding particles from said mixture; and thermal treatment of said particles thereby obtaining said dehydrogenation catalyst based on iron oxide. Also described is a dehydrogenation method involving: bringing a hydrocarbon which can be dehydrogenated, under hydrogenation reaction conditions, into contact with a dehydrogenation catalyst composition based on iron oxide, which contains an iron oxide component with low content of titanium, where the said iron oxide component is obtained through thermal treatment of a residue of yellow iron oxide prepared via precipitation from a solution of an iron salt, and an additional component of the dehydrogenation catalyst, where the said dehydrogenation catalyst composition based on iron oxide has a first titanium concentration which is less than approximately 300 parts per million; and separation of the dehydrogenation product. Also described is a method of improving operation of a dehydrogenation reactor installation which includes a dehydrogenation reactor containing a first dehydrogenation catalyst volume which can reduce titanium concentration, with the said method involving: removal of the dehydrogenation catalyst from the said dehydrogenation reactor and its replacement with a dehydrogenation catalyst composition based on iron oxide containing an iron oxide component with low content of titanium, where the said iron oxide component is obtained through thermal treatment of a residue of yellow iron oxide prepared via precipitation from a solution of an iron salt, and an additional component of dehydrogenation catalyst, where the said dehydrogenation catalyst composition based on iron oxide has a first titanium concentration which is less than approximately 300 parts per million, and thereby obtaining a second dehydrogenation reactor installation; and carrying out processes in the said second dehydrogenation reactor installation in dehydrogenation reaction conditions. 
     EFFECT: more efficient method of preparing dehydrogenation catalyst. 
     19 cl, 1 tbl, 1 dwg, 2 ex