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Co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine

A technology of nitroaniline and p-nitroaniline, which is applied in two fields, can solve the problems of dilute acid and bromine added as raw materials, high raw material costs, etc., and achieve the effects of saving raw material costs, simplifying the production process, and reducing the consumption of raw materials

Active Publication Date: 2013-05-01
山东鲁源化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of coproduction method of 2,6-dibromo-4-nitroaniline and bromine, aim at solving the respective production of bromine and 2,6-dibromo-4-nitroaniline Dilute acid and bromine are added as raw materials, and the cost of raw materials is high

Method used

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  • Co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine
  • Co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine
  • Co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Take an appropriate amount of 20% hydrochloric acid and add it to the synthesis kettle, weigh p-nitroaniline and add it to the synthesis kettle, add bromine to the synthesis kettle dropwise, the weight ratio of p-nitroaniline and bromine is 1:1.02 , a bromination reaction occurs at 40°C to generate hydrobromic acid and 2,6-dibromo-4-nitroaniline;

[0036] Feed chlorine gas into the synthesis kettle again, the molar ratio of chlorine gas and bromine added dropwise is 1:1, chlorine gas reacts with generated hydrobromic acid to generate bromine, and bromine continues to react with p-nitroaniline to generate 2,6 - Dibromo-4-nitroaniline solid and hydrochloric acid;

[0037] Send the mixture of 2,6-dibromo-4-nitroaniline solid and hydrochloric acid into a plate and frame filter, wash and separate with water, and the separated 2,6-dibromo-4-nitroaniline solid is flashed Dried in a steamer to obtain 2,6-dibromo-4-nitroaniline product;

[0038] (2) Import the hydrochloric...

Embodiment 2

[0043] (1) Take an appropriate amount of 25% hydrochloric acid and add it to the synthesis kettle, weigh p-nitroaniline and add it to the synthesis kettle, add bromine to the synthesis kettle dropwise, the weight ratio of p-nitroaniline and bromine is 1:1.5 , a bromination reaction occurs at 45°C to generate hydrobromic acid and 2,6-dibromo-4-nitroaniline;

[0044] Feed chlorine gas into the synthesis kettle again, the mol ratio of chlorine gas and the bromine added dropwise is 1.5:1, chlorine gas reacts with the generated hydrobromic acid to generate bromine, and bromine continues to react with p-nitroaniline to generate 2,6 - Dibromo-4-nitroaniline solid and hydrochloric acid;

[0045] Send the mixture of 2,6-dibromo-4-nitroaniline solid and hydrochloric acid into a plate and frame filter, wash and separate with water, and the separated 2,6-dibromo-4-nitroaniline solid is flashed Dried in a steamer to obtain 2,6-dibromo-4-nitroaniline product;

[0046] (2) Import the hydro...

Embodiment 3

[0051] (1) Add an appropriate amount of 30% hydrochloric acid to the synthesis kettle, weigh p-nitroaniline and add it to the synthesis kettle, add bromine dropwise to the synthesis kettle, the weight ratio of p-nitroaniline and bromine is 1:2 , a bromination reaction occurs at 50°C to generate hydrobromic acid and 2,6-dibromo-4-nitroaniline;

[0052] Feed chlorine gas into the synthesis kettle again, the molar ratio of chlorine gas and the bromine added dropwise is 2:1, chlorine gas reacts with generated hydrobromic acid to generate bromine, and bromine continues to react with p-nitroaniline to generate 2,6 - Dibromo-4-nitroaniline solid and hydrochloric acid;

[0053] Send the mixture of 2,6-dibromo-4-nitroaniline solid and hydrochloric acid into a plate and frame filter, wash and separate with water, and the separated 2,6-dibromo-4-nitroaniline solid is flashed Dried in a steamer to obtain 2,6-dibromo-4-nitroaniline product;

[0054] (2) Lead the hydrochloric acid generat...

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Abstract

The invention belongs to the technical field of synthesis of 2, 6-dibromo-4-nitroaniline and bromine, and particularly relates to a co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine. The method includes the following steps: (1) reacting paranitroaniline with bromine in a hydrochloric acid medium at 40 DEG C-50 DEG C to generate 2, 6-dibromo-4-nitroaniline and hydrobromic acid, and reacting chlorine gas with hydrobromic acid to generate hydrochloric acid; (2) adding hydrochloric acid generated in the step (1) into brine, subjecting brine to acidification, blowout, absorption, distillation and condensation, and enabling brine to enter a bromine water separator for separation to prepare bromine; and (3) adding bromine obtained in the step (2) dropwise into a reaction kettle in the step (1) to prepare 2, 6-dibromo-4-nitroaniline. The device comprises a bromine producing unit and a 2, 6-dibromo-4-nitroaniline producing unit communicated with the bromine producing unit. The co-production method and device save the raw material cost and simplify the production technology.

Description

technical field [0001] The invention belongs to the technical field of synthesis of 2,6-dibromo-4-nitroaniline and bromine, and in particular relates to a co-production method and a co-production device of 2,6-dibromo-4-nitroaniline and bromine . Background technique [0002] Bromine is a brown-red volatile liquid with a strong pungent odor. Its vapor is brown-red, and its solid is yellow-green with metallic luster. It is an important chemical raw material, especially in pharmaceutical, chemical, pesticide, oil fields and other industries. Widely used, mainly used in the preparation of bromide, medicine, fumigant, flame retardant, fire extinguishing agent, fuel intermediate, chemical preparation, refrigerant, photosensitive material, etc., and also used for bleaching and disinfection. [0003] The natural resources of bromine mainly exist in seawater, underground concentrated brine and salt lake water. Usually, concentrated seawater or brine is used to extract bromine. Duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/52C07C209/74C01B7/09
Inventor 冯仲善许明然李京东安国成王光平
Owner 山东鲁源化工科技有限公司
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