Invention Grant
- Patent Title: Monitoring of the stoichiometric ratio in the reaction of nitroaromatics with hydrogen
- Patent Title (中): 监测硝基芳烃与氢气反应的化学计量比
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Application No.: US13759466Application Date: 2013-02-05
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Publication No.: US08895783B2Publication Date: 2014-11-25
- Inventor: Andreas Raichle , Stefanie Haase , Holgar Braunsberg , Johannes Buettner , Ulrich Penzel , Samuel Neto
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Main IPC: C07C209/00
- IPC: C07C209/00 ; C07C209/36

Abstract:
The present invention relates to a continuous process for preparing at least one aromatic amine by hydrogenation of at least one nitroaromatic by means of hydrogen, where a liquid phase comprising at least the aromatic amine and a gas phase comprising at least hydrogen are present, in the presence of a catalyst suspended in the liquid phase at a temperature of from 50 to 250° C. and a pressure of from 5 to 50 bar, wherein the pressure in the reactor is kept essentially constant by continuous adaptation of the amount of hydrogen fed to the reactor, the total amount of hydrogen fed to the reactor is monitored and the introduction of the at least one nitroaromatic is interrupted if the hydrogen uptake in the reactor is not at least 50 mol % of the amount of hydrogen required for stoichiometric reaction of the at least one nitroaromatic to form the at least one aromatic amine.
Public/Granted literature
- US20130211141A1 MONITORING OF THE STOICHIOMETRIC RATIO IN THE REACTION OF NITROAROMATICS WITH HYDROGEN Public/Granted day:2013-08-15
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