A kind of rectification column for the production of 2-methyl-3-trifluoromethylaniline

Abstract

The invention relates to the technical field of rectification towers, and discloses a rectification tower for the production of 2-methyl-3-trifluoromethylaniline, comprising a tower body, a condenser and a reboiler, and a first pipeline, the end of the first pipeline away from the tower body is fixedly connected with the condenser, the bottom of the condenser is fixedly connected with a second pipeline, the second pipeline is fixedly connected with a return pipe, and the end of the return pipe away from the second pipeline is fixedly connected with the tower body, The bottom of the tower body is fixedly connected with the third pipeline, the end of the third pipeline away from the tower body is fixedly connected with the reboiler, the bottom of the reboiler is fixedly connected with the fourth pipeline, and the side of the reboiler is fixedly connected with the fifth pipeline, the fifth The other side of the pipe is fixedly connected to the bottom of the tower body, and the tower body is fixedly provided with a feed port. The invention has high separation efficiency, low tower body height, and can prevent liquid dripping from the tray.

Description

technical field [0001] The invention relates to the technical field of rectification towers, in particular to a rectification tower for the production of 2-methyl-3-trifluoromethylaniline. Background technique [0002] Trifluoromethylaniline has three isomers, which are o-, m-, and p-trifluoromethylaniline. It is an important fluorine-containing organic intermediate and is widely used in the fields of medicine, pesticides, dyes, etc., especially in the synthesis of multi- A new type of high-efficiency, low-toxic fluorine-containing pesticide has attracted much attention from the pesticide industry at home and abroad. [0003] m-trifluoromethylaniline and p-trifluoromethylaniline are important medicines, pesticides, dyes and material intermediates. They are two important products in trifluoromethylaniline products. The method of synthesizing these compounds is through trifluoromethylaniline After nitration and reduction of toluene, o-trifluoromethylaniline, a mixture of m-tr...

AI Technical Summary

Problems solved by technology

[0006] First, in the above-mentioned patent, the separation filter screen will drip, causing the unseparated mixed liquid in the upper layer to fall into the separation filter screen of the next layer, and the separation effect will decrease;

[0007] Second, in the above-mentioned patents, the mixed liquid stays in the separation filter for a short time, and the mass transfer and heat transfer efficiency is poor. This requires more separation filters to make the mixed liquid separate more fully, but it will increase the overall capacity of the tower body. Height, the height of the tower body is too high, which will cause inconvenience to the production of the tower body and subsequent maintenance;

[0008] Third, in the above-mentioned patent, when the mixed liquid is heated and splashed, the mixed liquid will rise from the lower separation filter to the upper separation filter, so that the liquid with high concentration in the upper separation filter and the The liquids with low concentration are mixed together, forming a back-mixing phenomenon in the rectification column, which can lead to a decrease in the separation effect

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