Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing 2,6-dichlorine para-nitraniline

A technology of p-nitroaniline and its production method, which is applied in 2 fields and can solve problems such as lowering market competitiveness and environmental pollution

Inactive Publication Date: 2011-09-14
苏州市罗森助剂有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this process, the purity of 2,6-dichloro-p-nitroaniline can only reach about 96%, and it contains 2-4% of internationally banned by-product polychlorinated benzidine, which greatly reduces the market competition of products force
In addition, a large amount of acid water is also produced in the reaction, which pollutes the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with specific examples, but is not limited thereto.

[0018] The production method of 2,6-dichloro-p-nitroaniline according to the present embodiment mainly includes the following steps.

[0019] ①. High-pressure ammonolysis reaction: Add 3000L of 33% ammonia water and 800Kg of 3,4,5-trichloronitrobenzene into a 4500L autoclave, slowly raise the temperature to 160-170°C, and control the pressure to 54Kg / cm 2 Left and right, record the time, and keep warm for 12 hours to obtain a product solution containing 2,6-dichloro-p-nitroaniline;

[0020] 2., separation: above-mentioned product solution passes in the separation still that fills saturated ammonium chloride solution, carries out separation, and precipitate is through filtering, drying to obtain product 722Kg and be 2,6-dichloro-p-nitroaniline, measure its purity as 99.50%, polychlorinated benzidine-free, based on 2,6-dichloro-p-nitroaniline, its ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for producing 2, 6-dichloro-p-nitroaniline. The method comprises the steps of taking 3, 4, 5-trichloronitrobenzene as a raw material and subjecting the 3, 4, 5-trichloronitrobenzene to high-pressure ammonolysis reaction in ammonia water so as to form the 2, 6-dichloro-p-nitroaniline, wherein the high-pressure ammonolysis reaction is carried out under the pressurebetween 3 and 8 MPa and at a temperature between 150 and 180 DEG C. The purity of the 2, 6-dichloro-p-nitroaniline produced by the method is more than 99 percent. In addition, the method generates nopolychlorinated biphenyls amine as a byproduct during production, thereby causing little pollution to environment.

Description

technical field [0001] The invention belongs to the field of organic synthesis, in particular to a production method of 2,6-dichloro-p-nitroaniline. Background technique [0002] 2,6-Dichloro-p-nitroaniline is an important dye intermediate. In the prior art, the preparation of 2,6-dichloro-p-nitroaniline mainly takes p-nitroaniline as raw material, in 30% hydrochloric acid medium, under the condition of 50 ℃, feeds chlorine gas, carries out chlorination reaction, chlorination After the reaction reaches the end point, the chloride material is press-filtered, washed until neutral, and dried to obtain the 2,6-dichloro-p-nitroaniline product. According to this process, the purity of 2,6-dichloro-p-nitroaniline can only reach about 96%, and it contains 2-4% of internationally banned by-product polychlorinated benzidine, which greatly reduces the market competition of products force. In addition, a large amount of acid water is produced in the reaction, which pollutes the envir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/52C07C209/10
Inventor 李根荣徐新连裘雪根
Owner 苏州市罗森助剂有限公司