Method of extracting bromine from bromine-bearing liquids or wastewaters

A technology for feed liquid and waste water, applied in the direction of bromine/hydrogen bromide, bromine, chlorine/hydrogen chloride, etc., can solve the problems that hinder the popularization and application of solvent extraction method, it is difficult to obtain high-purity products, and it takes a long time for phase equilibrium to achieve extraction The effect of small dosage, high saturation capacity and fast establishment time

Inactive Publication Date: 2018-12-25
山东省海洋化工科学研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon tetrachloride is resistant to bromine and chlorine oxidation, but it is banned as an ozone-depleting substance. Other halogenated hydrocarbons and halogenated aromatics are highly toxic and easily cause environmental pollution.
The traditional solvent extraction method generally uses a box-type mixing and settling tank extraction method, which has the following disadvantages: 1. The extraction process requires a large amount of organic phase, the volume of the organic phase that needs to be filled in the extraction tank is large, and the extraction tank occupies a large area; 2. 1. The extraction efficiency is low, the total flux of the extraction tank is small, and the processing capacity of the feed liquid is small; 3. The number of stages required is large, and it is difficult to obtain high-purity products; 4. It takes a long time to re-establish phase equilibrium; 5. The raffinate during the extraction process The organic phase in the
The above reasons have hindered the popularization and application of solvent extraction in the process of extracting bromine

Method used

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  • Method of extracting bromine from bromine-bearing liquids or wastewaters

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Effect test

Embodiment 1

[0028] Realize that the used bromine extracting device of process method of the present invention is as figure 1As shown, it includes a raw material tank 1, an acidification tank 2, an oxidation tank 3, a first centrifugal extractor 4, a second centrifugal extractor 5 and a distillation tower 6 arranged in sequence according to the process route; the acidification tank 2 is provided with a feed liquid inlet 21. An acidifying agent inlet 22 and an acidifying liquid outlet 23; the oxidation tank 3 is provided with an acidizing liquid inlet 31, an oxidizing agent inlet 32 ​​and an oxidizing liquid outlet 33; the raw material tank 1 communicates with the feed liquid inlet 21, and the acidifying agent inlet 22 It communicates with the acidifying agent supply device 7 , the acidizing liquid outlet 23 communicates with the acidizing liquid inlet 31 , and the oxidant inlet 32 ​​communicates with the oxidant supply device 8 . The first centrifugal extractor 4 has a first upper liquid i...

Embodiment 2

[0031] The method for extracting bromine comprises the following steps:

[0032] (1) The salt-making bittern in the raw material tank 1 enters the acidification tank 2 through the pipeline, and at the same time, the concentrated hydrochloric acid is sent to the acidification tank 2 through the acidifier supply device 7, and the salt-making bittern is acidified into a pH value of 3.0-4.0 Acidification solution: the acidification solution enters the oxidation tank 3 through the pipeline, and at the same time, chlorine gas is introduced into the oxidation tank 3 through the oxidant supply device 8, and the bromide ions in the acidification solution are oxidized into free bromine, thereby obtaining the oxidation solution, the bromine of the oxidation solution The element content is 0.68g / L. The amount of chlorine introduced in moles is 1.1 times the molar number of bromide ions in bittern for salt making.

[0033] (2) The oxidizing liquid in the oxidation tank 3 flows into the fi...

Embodiment 3

[0037] The method for extracting bromine comprises the following steps:

[0038] (1) The bromine-containing phosphate ore tail water in the raw material tank 1 enters the acidification tank 2 through the pipeline, and at the same time, the concentrated hydrochloric acid is sent to the acidification tank 2 through the acidifier supply device 7 to acidify the phosphate ore tail water to a pH value of 2.0 -3.0 acidizing solution; the acidizing solution enters the oxidation tank 3 through the pipeline, and simultaneously feeds chlorine gas into the oxidation tank 3 through the oxidant supply device 8 to oxidize the bromide ions in the acidizing solution into free bromine, thereby preparing the oxidation solution. The bromine content of the liquid is 1.35g / L. The amount of chlorine introduced in moles is 1.3 times the molar number of bromide ions in the salt-making bittern.

[0039] (2) The oxidizing liquid in the oxidation tank 3 flows into the first centrifugal extractor 4 throu...

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Abstract

The invention discloses a method of extracting bromine from bromine-bearing liquids or wastewaters. The method includes the steps of (1) acidifying a bromine-bearing liquid or wastewater, and introducing chlorine into the acidified liquid to oxidize bromine ions into free bromine so as to obtain an oxidized liquid; (2) feeding both the oxidized liquid and an extracting agent into a centrifugal extractor to carry out counter-current extraction so as to obtain extract and raffinate; (3) feeding both the raffinate and a stripping agent solution into the centrifugal extractor to carry out counter-current stripping so as to obtain hydrobromic acid-bearing absorption liquid and the extracting agent; (4) feeding the absorption liquid into a distilling column, introducing chlorine into the absorption liquid, generating hydrogen chloride and free bromine by reaction of the chlorine with hydrobromic acid in the absorption liquid, allowing the hydrogen chloride to turn into hydrochloric acid uponcontact with water, and distilling the free bromine during distilling to obtain finished bromine. The method herein is continuous, high in automation level, high in establishment speed of phase balance, and low in extracting agent consumption.

Description

technical field [0001] The invention relates to a method for extracting bromine from bromine-containing material liquid or waste water. Background technique [0002] Bromine is widely used in modern chemical industries such as pesticides, medicines, petroleum, and dyes. It is an important chemical raw material for the production of flame retardants, fire extinguishing agents, and photosensitive materials. A wide variety of inorganic bromides and organic bromides derived from it are in the national It plays a special role in economic and technological development. Bromine mainly exists in the ocean, oil and gas field water, underground brine and salt lake brine, and also exists in the feed liquid or wastewater of some chemical plants. [0003] The traditional bromine extraction methods are steam distillation and air blowing. The steam distillation method uses chlorine gas to oxidize the bromine ions in the bromine-containing liquid or waste water into elemental bromine, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09C01B7/01
CPCC01B7/012C01B7/096
Inventor 杨瑞光李善清孟烨李远超李秋霞
Owner 山东省海洋化工科学研究院
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