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Process for the production of dinitrotoluene

一种硝酸、硝化芳族的技术，应用在硝基化合物制备、有机化学等方向，能够解决无法实现等问题

Inactive Publication Date: 2010-12-29
COVESTRO DEUTSCHLAND AG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the goal of making the reaction as selective as possible and largely avoiding the formation of by-products cannot be achieved using only the above-mentioned reactors

Method used

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  • Process for the production of dinitrotoluene
  • Process for the production of dinitrotoluene

Examples

Experimental program
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Embodiment

[0028] Toluene is carried out the reaction that nitration generates dinitrotoluene is carried out in an experiment workshop according to the present invention, and wherein flow process is shown in figure 2 middle. A mixture of 9.4% by weight nitric acid, 71.5% by weight sulfuric acid and 19.1% by weight water was used as nitrating acid. A flow of 5000 kg / h of toluene was mixed with 36616 kg / h of premixed nitrating acid in figure 1 Mix in the mixing nozzle shown. The average flow velocity of toluene in the tubular reactor of the mixing nozzle was 5 m / s. The average flow velocity of nitrifying acid in the annular gap of the mixing nozzle is 2.2 m / s. Nitrification was carried out in reactor 1 with a cooling water temperature of about 35°C and in reactor 2 with a cooling water temperature of 65°C. A mixing nozzle is used in Reactor 1.

[0029] In comparative examples (ie, examples not representative of the present invention), nitrating acid and toluene were fed into the reac...

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Abstract

The present invention is directed to a process for the isothermal nitration of aromatic organic compounds, wherein an aromatic organic compound is brought into contact and reacted with a mixture of sulfuric acid and nitric acid. The mixture of sulfuric acid and nitric acid, and the aromatic organic compound are brought into contact with each other through a mixing nozzle which comprises a substantially cylindrical tubular reactor and an annular gap which surrounds the tubular reactor. The aromatic organic compound flows through the tubular reactor, and the mixture of sulfuric acid and nitric acid flows through the annular gap, and they are mixed together upon emerging from the tubular reactor and the annular gap, wherein the ratio of the average rates of flow of the aromatic organic compound in the tubular reactor, and of the mixture of sulphuric acid and nitric acid in the annular gap ranges from 0.5:1 to 10:1.

Description

technical field [0001] The invention relates to a process for the nitration of aromatic organic compounds in the liquid phase, wherein the aromatic organic compounds are vigorously mixed with a mixture of nitric acid and sulfuric acid in a mixing nozzle and then added to a reaction capable of active mixing device. During the process, dinitrotoluene is produced from toluene. Background technique [0002] Dinitrotoluene (DNT) is an intermediate in the production of toluene diisocyanate (TDI). DNT can be produced on an industrial scale by nitrating toluene with nitric acid in the presence of sulfuric acid (see, Ullmann's Encyclopedia of Industrial Chemistry, 6th edition, 2003, Wiley). However, this method has the disadvantage that it typically produces wastewater that must be purified before being discharged into surface waters. The cost of purifying these wastewaters is quite high. [0003] It is therefore an object of the present invention to reduce the formation of these...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C201/08C07C205/06C07C205/21
CPCC07C205/06C07C201/08
Inventor J·穆宁B·彭尼曼D·瓦斯蒂昂V·米谢勒J·卡拉瓦焦J·F·吉斯奇
Owner COVESTRO DEUTSCHLAND AG
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