Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1981-11-13
1983-05-31
Jiles, Henry R.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
546166, 546181, 546184, 546249, 546251, C07D21506, C07D21309
Patent
active
043862071
ABSTRACT:
An improved process for the preparation of pyridines and/or hydrogened pyridines that have been substituted with a hydrocarbon group at one or more carbon atoms. .gamma.-cyanoketone, in a gaseous phase and in the presence of hydrogen, is passed over a first catalyst in a reaction zone to form a reaction mixture containing substituted pyridines and/or hydrogenated pyridines and hydrogen. A hydrogen-containing gas is separated from the reaction mixture and, prior to being recycled, is subjected to a two-step catalytic treatment. In the first catalytic treatment step, the hydrogen-containing gas is passed over an iron, nickel, cobalt, or platinum-containing catalyst at a temperature of between about 250.degree. and 550.degree. C. In the second catalytic treatment step, the hydrogen-containing gas is passed over an iron, nickel, or cobalt catalyst at a temperature of between about 550.degree. and 800.degree. C.
REFERENCES:
patent: 4276419 (1981-06-01), Verheijen et al.
de Graaf Theodorus F. M.
Geersheuvels Charles H.
Dentz Bernard
Jiles Henry R.
Stamicarbon B.V.
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