Back to results
US 2003/0171627 A1Published application
Process for the production of a dinitronaphthalene isomer mixture with a high proportion of 1,5-dinitronaphthalene
AssigneeBayer Aktiengesellschaft
InventorsMathias Brandt, Stephan Klein, Gerhard Wegener
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the production of a dinitronaphthalene isomer mixture, in which naphthalene and/or 1-nitronaphthalene is reacted with nitric acid in the presence of a zeolite.
Claims10
A process for the production of a dinitronaphthalene isomer mixture comprising reacting naphthalene and/or 1-nitronaphthalene with nitric acid in the presence of a zeolite.
A process for the production of 1,5-diaminonaphthalene comprising
- a) reacting naphthalene and/or 1-nitronaphthalene with nitric acid in the presence of a zeolite to form 1,5-dinitronaphthalene, and
- b) hydrogenating the 1,5-dinitronaphthalene to form 1,5-diaminonaphthalene.
A process for the production of 1,5-diisocyanatonaphthalene comprising
- a) reacting naphthalene and/or 1-nitronaphthalene with nitric acid in the presence of a zeolite to form 1,5-dinitronaphthalene,
- b) hydrogenating the 1,5-dinitronaphthalene to form 1,5-diaminonaphthalene, and
- c) phosgenating the 1,5-diaminonaphthalene to form 1,5-diisocyanatonaphthalene.
Dependencies are inferred from the claim text.