Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1995-08-04
1998-09-15
Robinson, Allen J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564410, 564420, C07C20904
Patent
active
058081577
ABSTRACT:
Aromatic amines are produced by hydrogenation of the associated aromatic nitro compounds in the gas phase over fixed catalysts. The catalysts contain active hydrogenation metals on supports. The reaction is conducted at a pressure of 2-50 bar and at a temperature in the range 250.degree.-500.degree. C. under adiabatic conditions. A circulating gas is passed over the catalyst, which circulating gas contains 3-150 moles of hydrogen, 2-100 moles of the amino groups to be formed per mole of nitro groups, and 2 to 6 moles of water per amino group equivalent. The amine and water formed, as well as a purification stream, are separated from the circulating gas. Thereafter the circulating gas is enriched with volatilised aromatic nitro compound and fresh hydrogen and recycled.
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Buysch Hans-Josef
Langer Reinhard
Pentling Ursula
Wagner Paul
Badio Barbara
Bayer Aktiengesellschaft
Gil Joseph C.
Robinson Allen J.
Whalen Lyndanne M.
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