Method for recycling bromine from bromine containing waste water

A wastewater recovery and bromine technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large number of equipment, complicated process, explosion, etc., to avoid poisonous and harmful, The effect of reducing bromine consumption and occupying a small area of ​​equipment

Active Publication Date: 2019-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the fact that the existing production method of bromine will involve the consumption of a large amount of oxidant, and there are potential safety hazards such as leakage and explosion of chlorine gas and hydrogen peroxide; at the same time, the process is complicated and the number of equipment involved is large, and further improvement will be needed.
For the treatment of industrial bromine-containing wastewater, especially when the amount of wastewater is small and dispersed, the feasibility of applying the above oxidation method is not high

Method used

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  • Method for recycling bromine from bromine containing waste water
  • Method for recycling bromine from bromine containing waste water
  • Method for recycling bromine from bromine containing waste water

Examples

Experimental program
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Embodiment 1

[0036] The electrolysis device used in the electrolytic treatment of bromine-containing wastewater in this embodiment is as follows: figure 1 As shown, it mainly includes a DC power supply, a 1.0L electrolyzer, four titanium electrode sheets, and a peristaltic pump for extractant circulation. The flow rate of the peristaltic pump is adjustable. The titanium electrode is a 8.0cm×20.0cm rectangular titanium plate with a thickness of 1.0mm, and the surface is coated with a ruthenium oxide coating, which can effectively prevent corrosion during the electrode oxidation reaction. During the electrolysis process, the phase-separated extracted oil phase can be pumped to the distributor arranged in the anode area through the oil phase circulation pump, and the dispersed oil phase extractant can quickly extract the bromine element generated by electrolysis into the oil phase in the anode area to realize Br 2 enrichment separation.

[0037]The bromine-containing wastewater treated in th...

Embodiment 2

[0041] The electrolytic treatment of bromine-containing wastewater was carried out in a manner similar to that of Example 1. The PTA bromine-containing wastewater after electrolytic treatment in Example 1 was used for 2 hours to continue electrolytic treatment, and its Br content was 590 ppm. Firstly separate the PX phase with bromine elemental substance extracted, add sulfuric acid to adjust the pH value of the water phase to 3.0, then add 200ml of fresh PX as the extraction agent, and circulate the upper oil phase to the distributor in the anode area for extraction by a peristaltic pump. The flow rate of the peristaltic pump is 20ml / min. Turn on the power, adjust the voltage and maintain a stable current of 0.8A to carry out the electrolysis reaction. It can be observed that a large number of bubbles are generated on both the anode plate and the cathode plate. The oil phase PX gradually deepens as the electrolysis progresses, which also shows that the electrolysis process ha...

Embodiment 3

[0043] Carry out the electrolysis treatment of bromine-containing wastewater in a manner similar to Example 1, and the bromine-containing wastewater that is used is also the PTA wastewater described in Example 1, and the PX extractant. The difference is that in this embodiment, a plate-type graphite electrode (8.0 cm×20.0 cm) is used instead of a titanium electrode, and sulfuric acid is added to adjust the pH value to 2.0. The change law of the remaining bromine concentration in the wastewater was compared with image 3 . It can be seen from the results that, when the graphite electrode is used under the condition of PH=2.0, the Br ion in the water undergoes an electrolysis reaction, the concentration decreases rapidly, and then reaches the equilibrium concentration, and the removal rate of the Br ion can reach 65%, indicating that the lower the pH value, the more favorable Electrolytic recovery of Br ions. Graphite is used as the electrode. After long-term electrolysis expe...

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Abstract

The invention discloses a device and method for recycling bromine from bromine containing waste water. The method comprises the following steps that a, pre-treated bromine containing waste water is led into an electrolysis device, direct current passes through the bromine containing waste water in the electrolysis device, and bromide ions have the electrolytic reaction to generate elemental bromide; b, an extraction agent and an electrolyzed water solution make contact, and the elemental bromide is recycled from an extraction phase; c, the extracted water phase is subjected to steam stripping,the extraction agent is recycled, and then the water phase enters a subsequent waste water treatment unit. The oxidizing agent safety problem brought by a traditional oxidation method can be solved.The recycled molecular bromine can directly return to the system to be applied, the bromine consumption is reduced. The high-added-value hydrogen resources can be recycled.

Description

technical field [0001] The invention relates to a method for recycling bromine-containing waste water, which uses an electrolysis method to oxidize ion bromine to generate elemental bromine and then further recycles and utilizes the wastewater. Background technique [0002] Brominated compounds are important fine chemicals, widely used as pharmaceutical intermediates, dye intermediates, gasoline additives, agricultural chemicals, flame retardants, and developers. Bromine is an important raw material for the synthesis of bromine-containing compounds, and is also an important raw material for the bromination reaction in the synthesis of related pharmaceutical intermediates. The corresponding target products can be obtained through substitution or addition reactions between reactants and bromine. As reported in the patent CN102942443, the bromination process of benzene to bromobenzene, the preparation process of biphenyl bromide reported in the patent CN107337218, and in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/24C02F1/461
CPCC02F1/461C25B1/24
Inventor 成有为祝炎雷卢晓飞李希
Owner ZHEJIANG UNIV
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