Method for recovering bromine from bromine-containing wastewater in production of brominated aniline

A technology of bromoaniline and wastewater, applied in the field of bromine recovery, to achieve the effects of low equipment corrosion resistance and automation requirements, low wastewater requirements, and simple process flow

Active Publication Date: 2020-03-24
ZHEJIANG RUNTU INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purpose of the present invention is to provide a method for recovering bromine from the bromine-containing waste water produced in the production of bromoaniline, which not only solve

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  • Method for recovering bromine from bromine-containing wastewater in production of brominated aniline

Examples

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Effect test

Embodiment 1

[0075] A large dye company in Zhejiang produces 2,4-dinitro-6-bromoaniline. The bromine ion content in the bromine-containing wastewater is 9640mg / L, the COD is 5040mg / L, and the acidity is 4.75%. In the present invention, acidity can be expressed as the mass fraction of sulfuric acid present in the hydrolyzate.

[0076] The method for reclaiming bromine from the bromine-containing wastewater producing 2,4-dinitro-6-bromoaniline of the present embodiment may further comprise the steps:

[0077] Step 1. Mix trioctylamine, sulfonated kerosene, and n-octanol in a volume ratio of 3:6:1 as an extractant.

[0078] Step 2. Mix waste water and extractant at a volume ratio of 2.5:1, and fully stir at 50°C for 30 minutes.

[0079] Step 3, the solution is placed in a separatory funnel, allowed to stand for stratification, and the primary extract phase (oil phase) and primary raffinate (water phase) are separated. Among them, the bromide ion concentration in the primary raffinate is 25...

Embodiment 2

[0086] A dye company in Zhejiang produces 2,6-dibromo-4-nitroaniline. The bromine ion content in the bromine-containing wastewater is 11640mg / L, the COD is 8580mg / L, and the acidity is 4.33%.

[0087] The present embodiment reclaims the method for bromine from the bromine-containing waste water of 2,6-dibromo-4-nitroaniline comprising the following steps:

[0088] Step 1. Mix trioctylamine, sulfonated kerosene and n-octanol in a volume ratio of 3:6:1 as an extractant.

[0089] Step 2. Mix the waste water and the extractant at a volume ratio of 2:1, and fully stir at 50°C for 30 minutes.

[0090] Step 3, the solution is placed in a separatory funnel, allowed to stand for stratification, and the primary extract phase (oil phase) and primary raffinate (water phase) are separated. The bromide ion concentration in the primary extract is 4322mg / L, and the COD is 5690mg / L.

[0091] Step 4. The primary raffinate (aqueous phase) is then mixed with the extractant at a volume ratio of...

Embodiment 3

[0097] A dye company in Zhejiang produces p-bromoaniline. The bromine ion content in the bromine-containing wastewater is 7450mg / L, the COD is 4269mg / L, and the acidity is 2.68%.

[0098] Step 1. Mix trioctylamine, sulfonated kerosene, and n-octanol in a volume ratio of 3:6:1 as an extractant.

[0099] Step 2. Mix waste water and extractant at a volume ratio of 2.5:1, and fully stir at 50°C for 30 minutes.

[0100] Step 3, the solution is placed in a separatory funnel, allowed to stand for stratification, and the primary extract phase (oil phase) and primary raffinate (water phase) are separated. The bromide ion concentration in the primary extract is 1760mg / L, and the COD is 1346mg / L.

[0101] Step 4. The primary raffinate (aqueous phase) is then mixed with the extractant at a volume ratio of 2.5:1 for secondary extraction, and the extraction conditions are the same as in step 2.

[0102] Step 5, obtain secondary extraction phase (oil phase) and secondary raffinate (water ...

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Abstract

The invention provides a method for recovering bromine from bromine-containing wastewater in production of brominated aniline, and the method comprises the following steps: a primary extraction step:absorbing bromide ions in the bromine-containing wastewater by using an organic extractant to obtain a primary extraction solution; a separation step: separating the primary extraction liquid to obtain a primary extraction phase and primary raffinate; and a reverse extraction step: absorbing the bromide ions in the primary extraction phase by using an alkaline substance to obtain a regenerated extracting agent and a bromide salt solution. The method is simple in technological process, free of dangerous links such as high temperature and high pressure in the whole process, free of toxic and harmful gases and new three wastes and environmentally friendly, and the bromide ions in the wastewater can be effectively recycled; furthermore, the method provided by the invention has low requirementson wastewater, corrosion resistance and automation of equipment, so that the operation cost is relatively low, and the method is suitable for industrial treatment.

Description

technical field [0001] The invention relates to a method for recovering bromine from bromine-containing wastewater produced by bromoaniline, belonging to the field of dye wastewater treatment. Background technique [0002] Bromoaniline refers to aniline compounds with one or more bromide ions attached to the benzene ring. It is an important class of chemical intermediates, widely used in the synthesis of fine chemical products such as medicine, dyes, and pigments. For example, p-bromoaniline can be used to produce anticancer drugs and coumarin fluorescent dyes; 2,4-dinitro-6-bromoaniline is used to produce dye disperse navy blue 2GL; N,N di(2-hydroxypropyl) -2,4,6-Tribromoaniline (BHTBA) can be used as a flame retardant chain extender in the synthesis of polyurethane. The current production process of bromoaniline has a one-step bromination reaction mainly using bromine as raw material. Therefore, in the synthesis process, a stream of synthetic wastewater will inevitably ...

Claims

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Application Information

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IPC IPC(8): C02F1/26C01B7/09C02F103/36C02F101/12
CPCC02F1/26C01B7/096C02F2101/12C02F2301/08C02F2103/36
Inventor 王迪丁兴成刘仲明沈振雄王汝陈清
Owner ZHEJIANG RUNTU INST
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