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Process for nitrating aromatic hydrocarbons

A technology for aromatic hydrocarbons and oxides, which is applied in the field of aromatic hydrocarbon nitration and can solve problems such as low conversion rate

Inactive Publication Date: 2002-05-01
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low conversion rate of

Method used

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Examples

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Embodiment Construction

[0008] specific implementation plan

[0009] At the start of the nitration, preference is given to using at least 0.5 mol % of water, particularly preferably at least 1 mol % of water, based on the aromatic hydrocarbons to be nitrated.

[0010] Either liquid phase water or vapor state water can be used. For example, water may be sent to the reaction system in a liquid phase in admixture with the aromatic hydrocarbon to be nitrated, or water alone may be sent to the reaction system in a liquid or vapor state. It is also possible to use water in an aqueous liquid, preferably water in nitric acid.

[0011] As nitrogen oxides, nitrogen oxides in the liquid phase or nitrogen oxide-containing gas streams can be used. In one embodiment of the invention, liquid dinitrogen tetroxide is used, which can be fed to the reaction system as a mixture with the aromatic compound to be nitrated. In a preferred embodiment, a nitrogen monoxide and / or nitrogen dioxide-containing gas stream is us...

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Abstract

A method for the nitration of aromatic hydrocarbons (I) by liquid-phase reaction with a nitrogen oxide (NO, N2O3, NO2 or N2O4) and an oxygen-containing gas stream in presence of a heterogeneous oxide catalyst, in which the reaction is started in presence of at least 0.1 mol% water (based on I).

Description

field of invention [0001] The present invention relates to a process for the nitration of aromatic hydrocarbons. Background of the invention [0002] Aromatic nitro compounds are key intermediates in organic synthesis and occupy an important position in the chemical industry. For example, they are reduced to amines, which react further to form isocyanates. Therefore, nitrobenzene is the raw material for preparing aniline, and methylene diphenyl diisocyanate (MDI) can be obtained from aniline, and MDI is an important structural unit for preparing polyurethane foam. In addition, aromatic nitro compounds are also the basis for the preparation of crop protection agents, drugs, dyes and explosives. [0003] Aromatic nitro compounds are industrially obtained by nitrating corresponding aromatic compounds with nitrating acid, that is, a mixture of concentrated nitric acid and sulfuric acid. This method has been known since the nineteenth century. According to the concentration, ...

Claims

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Application Information

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IPC IPC(8): C07C201/06C07B43/02C07B61/00C07C201/08C07C205/06
CPCC07C201/08C07B43/02C07C205/06C07C201/06
Inventor M·埃尔曼K·埃贝尔
Owner BASF AG
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