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Device and method for producing aromatic amines

A device and technology for aliphatic amines, applied in the field of devices and methods for preparing aromatic amines, can solve the problems of unfavorable optimal control of hydrogenation reactors, delayed data transmission, complicated equipment and the like

Inactive Publication Date: 2014-07-23
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, the hitherto known methods of testing the completeness of hydrogenation reactions are not satisfactory in every respect
For example, some of these methods require complex equipment, while others rely on operator experience, which inevitably leads to errors
Other methods, such as those for determining the temperature rise, have delays in transmitting the required data, which is also disadvantageous for optimal control of the hydrogenation reactor

Method used

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  • Device and method for producing aromatic amines
  • Device and method for producing aromatic amines
  • Device and method for producing aromatic amines

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Embodiment

[0047] figure 1 Reactor A according to the invention is shown. Molten dinitrotoluene and hydrogen are supplied to reactor A via reactant line 1 and hydrogen line 2, respectively. Reactor A contains a mixture of toluenediamine and water and a nickel catalyst, and dinitrotoluene is hydrogenated at a temperature of 130° C. and a pressure of 20 bar.

[0048] A part of the reaction mixture - in particular containing reactants, products and catalyst - is circulated from reactor A through line sections 8 , 9 , 3 , 5 by means of pump D. Line section 9 leads to a condenser F in which the reaction mixture is cooled. From there the cooled reaction mixture is fed via line section 3 to a cross-flow filter E, where the hydrogenation product, namely diaminotoluene (“DNT”), is withdrawn via product line 6 . The remaining reaction mixture is returned to the reactor via line section 5, thus ending the cycle.

[0049] The amount of dinitrotoluene melt was adjusted so that the average reside...

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Abstract

The invention relates to a method for producing organic amino compounds from organic nitro compounds, wherein the organic nitro compound hydrogenated to the organic amino compound with a hydrogen-containing gas stream by means of a catalyst, the reaction course of the hydrogenation being monitored by analysis of secondary products forming during hydrogenation, wherein the method is characterised in that the concentration of one or more gaseous secondary products is determined in the gas phase and if the concentration falls below a predefinable minimum concentration the hydrogenating activity of the catalyst is increased. The present invention also relates to a device for performing said method.

Description

[0001] Cross References to Related Applications [0002] Pursuant to 35 U.S.C. §119(a)-(g), this application claims priority to European Patent No. 13152196.5, filed January 22, 2013. Background technique [0003] The present invention relates to the equipment and the method of preparing organic amino compound from organic nitro compound, wherein use the gas stream containing hydrogen gas to hydrogenate the organic nitro compound to organic amino compound by means of catalyst, the reaction process of said hydrogenation is analyzed in the hydrogenation process By-products formed in the [0004] The preparation of organic amino compounds from the corresponding nitro compounds is widely known. In the method described in EP0223035A1 the hydrogenation is carried out by means of a modified Raney nickel catalyst dispersed in a liquid reaction mixture. The catalyst can be separated from the liquid reaction mixture by filtration or settling and optionally returned to the process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/51C07C209/36
CPCC07C209/36Y10T436/12C07C211/50G01N33/0073
Inventor B·彭纳曼B·特默
Owner COVESTRO DEUTSCHLAND AG