Use of a monolith catalyst for the hydrogenation of dinitrotolue

Details Use of a monolith catalyst for the hydrogenation of dinitrotolue Use of a monolith catalyst for the hydrogenation of dinitrotolue

1998-08-07

1999-12-21

McKane, Joseph K.

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

Organic compounds

Amino nitrogen containing

564420, C07C20936

Patent

active

060051434

ABSTRACT:
This invention relates to an improvement in a process for hydrogenating a nitroaromatic composition namely dinitrotoluene by contacting the dinitrotoluene with hydrogen in a reactor employing a monolith catalyst system. Broadly the improvement resides in the continuous, essentially solventless, adiabatic hydrogenation of dinitrotoluene to toluenediamine in a plug flow reactor system incorporating the monolith catalyst. The process generally comprises the steps:
introducing a feedstock comprised of dinitrotoluene and reaction product components continuously into the reactor and said feedstock having less that 30% by weight of a solvent,
carrying out the hydrogenation of dinitrotoluene to toluenediamine under adiabatic conditions; and,
continuously removing hydrogenated reaction product from the reactor.

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Hatziantoniou, et al., "The Segmented Two-Phase Flow Monolith Catalyst Reactor. An Alternative for Liquid-Phase Hydrogenation" Ind. Eng. Chem. Fundam vol. 23, No. 1, 82-88 (1984).
Hatziantoniou, et al., "Mass Transfer and Selectivity in Liquid-Phase Hydrogenation of Nitro Compounds in a Monolithic Catalyst Reactor with Segmented Gas-Liquid Flow", Ind. Eng. Chem Process Des. Dev., vol. 25, No. 4, 964-970 (1986).

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