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A method for recovering bromine from bromobutyl rubber industrial waste water

A technology of brominated butyl rubber and industrial wastewater, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the environmental pollution caused by the discharge of bromine-containing wastewater, bromine elements cannot be processed and recycled, and bromine resources waste and other issues, to achieve the effect of resource reuse, large economic and environmental benefits, and low labor management costs

Active Publication Date: 2021-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of general wastewater treatment methods will not only cause the discharge of bromine-containing wastewater to pollute the environment, but also cause a great waste of bromine resources
[0004] Chinese patent CN 102464417A concentrates bromine-containing wastewater and mixes it with chlorine-containing bactericide, and then adds it to industrial circulating cooling water for sterilization treatment. Although the rational utilization of wastewater resources can be realized, on the one hand, the suspended solids and hardness in the wastewater are extremely high. It is easy to cause equipment pollution, and the bromine element in the circulating water still cannot be processed and recovered
However, it is necessary to use a toxic extractant during the treatment process, and the extractant will cause serious losses during the extraction process, which increases the cost of bromine extraction and pollutes the environment

Method used

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  • A method for recovering bromine from bromobutyl rubber industrial waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] The industrial wastewater produced by a company to prepare bromobutyl rubber was used as the raw water in this example. The specific water quality data analysis is shown in Table 1:

[0108] Table 1

[0109] serial number parameter Value range unit 1 temperature 75～85 ℃ 2 TSS 1000～2000 mg / L 3 pH 8～10 - 4 Na +

300～600 mg / L 5 Br -

4000～8000 mg / L 6 Cl -

300～500 mg / L 7 SO 4 2+

15000～25000 mg / L 8 rubber powder 50～100 mg / L

[0110] Adopt the method for reclaiming bromine from brominated butyl rubber industrial waste water described in the application to reclaim bromine, concrete steps are as follows:

[0111] S1, the brominated butyl rubber industrial wastewater and the bromine-containing wastewater in step S5 are heat-exchanged and cooled, then enter the homogeneous pool, stay for 4 hours, and mix with the backwash water of the multimedia filter and the backwash water of t...

Embodiment 2

[0118] The water quality data of the bromobutyl rubber industrial wastewater used in this embodiment are the same as those in Embodiment 1.

[0119] Adopt the method for reclaiming bromine from brominated butyl rubber industrial waste water described in the application to reclaim bromine, concrete steps are as follows:

[0120] S1, the brominated butyl rubber industrial wastewater and the bromine-containing wastewater in step S5 are heat-exchanged and cooled, then enter the homogeneous pool, stay for 4 hours, and mix with the backwash water of the multimedia filter and the backwash water of the ultrafiltration membrane module After the mixture is further cooled to 52°C, it enters the nano-dissolved air flotation device. Based on each liter of brominated butyl rubber industrial wastewater, 10ppm of PAC and 0.5ppm of PAM coagulant are added to remove large suspended solids and organic pollutants. The removal rate of COD reaches 70% to obtain the primary pretreatment wastewater; ...

Embodiment 3

[0127] The water quality data of the bromobutyl rubber industrial wastewater used in this embodiment are the same as those in Embodiment 1.

[0128] Adopt the method for reclaiming bromine from brominated butyl rubber industrial waste water described in the application to reclaim bromine, concrete steps are as follows:

[0129] S1, the brominated butyl rubber industrial wastewater and the bromine-containing wastewater in step S5 are heat-exchanged and cooled, then enter the homogeneous pool, stay for 4 hours, and mix with the backwash water of the multimedia filter and the backwash water of the ultrafiltration membrane module After the mixture is further cooled to 50°C, it enters the nano-dissolved air flotation device. Based on each liter of brominated butyl rubber industrial wastewater, 12ppm of PAC and 1ppm of PAM coagulant are added to remove large suspended particles and organic pollutants. The COD removal rate reaches 70% to obtain the primary pretreatment wastewater;

...

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Abstract

The invention discloses a method for recovering bromine from brominated butyl rubber industrial waste water, comprising the following steps: S1, after the brominated butyl rubber industrial waste water is cooled in a homogeneous pool, enters a nano-dissolved air flotation device, Add coagulant to remove large particles and organic matter, and obtain primary pretreatment wastewater; S2, introduce primary pretreatment wastewater into a multimedia filter for filtration, and cool down to obtain secondary pretreatment wastewater; S3, secondary pretreatment wastewater Filtrate through the ultrafiltration membrane to remove tiny particles to obtain ultrafiltration wastewater; S4, adjust the ultrafiltration wastewater to acidity, add an oxidant to oxidize free bromine to bromine, and obtain bromine-containing wastewater; S5, flow bromine-containing wastewater through Hollow fiber hydrophobic membrane, bromine volatilizes and permeates the membrane at the interface between the membrane and water, and is absorbed and reacted by the absorption liquid to obtain a bromine-containing salt solution; S6, evaporating and crystallizing the bromine-containing salt solution to obtain a bromine-containing solid salt. The method of the invention has low energy consumption, high separation efficiency, simple process and no pollution.

Description

technical field [0001] The invention belongs to the technical field of industrial waste water treatment, in particular to a method for recovering bromine from brominated butyl rubber industrial waste water. Background technique [0002] Bromobutyl rubber (BIIR) is an isobutylene-isoprene copolymer elastomer containing activated bromine. Its research and development began in the 1950s. Because of its heat resistance, ozone resistance, corrosion resistance, low air permeability, flex resistance and easy sharing with other rubber products, it is widely used in various rubber products, especially It is an irreplaceable raw material for the manufacture of radial tire inner tubes, tubeless tires and special pharmaceutical products. In recent years, due to the vigorous development of the automobile industry, the domestic demand and industrial output of bromobutyl rubber are also increasing day by day. A large amount of bromobutyl rubber industrial wastewater is inevitably produce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/36
CPCC02F1/001C02F1/04C02F1/24C02F1/44C02F1/444C02F1/5236C02F1/56C02F1/66C02F1/72C02F1/722C02F1/76C02F9/00C02F2101/36
Inventor 任鹏飞栾金义杨永强奚振宇张新妙王玉杰
Owner CHINA PETROLEUM & CHEM CORP