Raney nickel catalysis of aromatic amines

Details Raney nickel catalysis of aromatic amines Raney nickel catalysis of aromatic amines

1982-04-05

1985-03-05

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564449, C07C 8524

Patent

active

045032513

ABSTRACT:
Hydrogenation processes utilizing improved Raney nickel alloy catalysts are disclosed. The catalyst comprises a monolithic mesh type structure of a nickel alloy having an integral Beta phase Raney Ni.sub.x M.sub.1-x coating on its outer surfaces, where M is a catalytic activator selected from the group consisting of molybdenum, ruthenium, tantalum and titanium and where x, the weight fraction of nickel in the combined alloy, is between about 0.80 and about 0.95. The catalyst is effective in processes for hydrogenating an amine-substituted aromatic compound of the type ##STR1## wherein K is either benzene or naphthalene, R.sub.1 is a hydrogen atom or an aliphatic chain containing from about 1 to about 12 carbon atoms or a phenyl radical, R.sub.2 is a hydrogen atom, an amine group or an aliphatic chain containing from about 1 to about 3 carbon atoms, R.sub.3 is hydrogen or an amine group, and R.sub.4 is an amine group. When this catalyst is used, substantially higher reactant flow rates and lower operating temperatures are possible as compared to conventional fluidized bed granular catalysts.

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Barton Milligan and Kevin E. Gilbert, "Diaminotoluenes", Kirk-Othmer Encyclopedia of Chemical Technology, Third Edition, vol. 2, 1978, pp. 321-329.

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