Paranitrotoluene conveying device and device for preparing trinitrotoluene through nitrification of paranitrotoluene

Abstract

The invention discloses a paranitrotoluene conveying device. The paranitrotoluene conveying device is characterized by comprising a paranitrotoluene product channel, a centrifugal pump, a paranitrotoluene cooler, a paranitrotoluene high-position channel and a paranitrotoluene feeding pipe. The paranitrotoluene product channel, the centrifugal pump, the paranitrotoluene cooler and the paranitrotoluene high-position channel are sequentially connected through a heat preservation pipeline; and a material outlet of the paranitrotoluene high-position channel is connected with the paranitrotoluene feeding pipe. According to the paranitrotoluene conveying device, the paranitrotoluene conveying process is smooth, continuous and stable; and according to a device for preparing trinitrotoluene through nitrification of paranitrotoluene, the production process of the trinitrotoluene is continuous and stable, and the product yield is high.

Description

Technical field: [0001] The invention relates to the field of TNT preparation, in particular to a delivery device for p-nitrotoluene and a device for preparing TNT by nitration of p-nitrotoluene. Background technique [0002] TNT, also known as TNT (trinitrotoluene), Chinese name: 2,4,6-trinitrotoluene, English name: 2,4,6-Trinitrotoluene; it is white or yellow needle-like crystal, odorless, with Hygroscopicity. The mechanical sensitivity is low, the stability is good, the production and use are relatively safe, and it can be stored and transported for a long time, but it may explode when heated, exposed to open flames, or subjected to friction, vibration, and impact. [0003] At present, TNT is mainly produced by three-stage continuous nitration method. First, toluene, or a mixture of toluene and o-nitrotoluene is used as a raw material, which is put into the first stage of nitration. After nitration reaction with nitric acid mixed acid, mononitrotoluene is produced, and t...

AI Technical Summary

Problems solved by technology

[0005] The traditional three-stage continuous nitration method is used to produce TNT, and there are many side reactions in the reaction process. As mentioned above, the meta-nitrotoluene produced in the first stage of nitration will eventually generate impurities such as asymmetric TNT, resulting in a low product yield. Raw material consumption quota is high, resulting in high cost and little room for reduction

At the same time, in the process of continuous nitration reaction, the side reaction is easy to generate polymer and affect the normal production

If 2,2-dicarboxy-3,3,5,5-tetranitroazobenzene polymer is easy to be generated during the reaction, the polymer is easy to precipitate and adhere to the outer wall of the cooling coil of the nitration machine, reducing the temperature of the coil. The heat transfer effect makes it difficult to control the reaction temperature of the nitration machine, which eventually leads to the need to stop and empty the material of the nitration machine after about half a month of continuous production, clean and scrub, and then put it into production, which seriously affects production efficiency

Images