A method for recovering bromine in hazardous waste liquid containing brominated aromatics

A brominated aromatic hydrocarbon and dangerous technology, applied in the field of recovering bromine, can solve the problems of reducing the service life of the incinerator, corrosion of the incinerator, and high treatment costs, and achieve the effects of good economic benefits, improved recovery efficiency, and high product purity.

Active Publication Date: 2022-02-11
GO HIGHER ENVIRONMENT GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of lye is needed in the process of flue gas treatment, and the treatment cost is high; at the same time, in the process of using the incinerator to incinerate the residual liquid, it will also cause serious corrosion to the incinerator, thereby reducing the service life of the incinerator

Method used

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  • A method for recovering bromine in hazardous waste liquid containing brominated aromatics
  • A method for recovering bromine in hazardous waste liquid containing brominated aromatics
  • A method for recovering bromine in hazardous waste liquid containing brominated aromatics

Examples

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preparation example Construction

[0048] The application provides a method for preparing a molecular sieve loaded with copper oxide, which specifically includes the following steps:

[0049] a. Modification of the HZSM-5 molecular sieve: modify the HZSM-5 molecular sieve with a modifier, and dry at high temperature to obtain the molecular sieve A.

[0050] Wherein, the modifying agent is a mixed solution composed of sodium fluoride, trifluoroacetic acid and sulfuric acid. Among them, the weight ratio of sodium fluoride to HZSM-5 molecular sieve is (4-6):1. The weight ratio of sulfuric acid to HZSM-5 molecular sieve is (1.5-2.5):1. The weight ratio of trifluoroacetic acid to HZSM-5 molecular sieve is (1.4-2.8):1. Further, the molar concentration of sulfuric acid is 9.2-13.8mol / L. The temperature of the modification treatment is 90-110° C., and the modification time is 4-6 hours.

[0051] The temperature of high-temperature drying is 120-140°C, and the drying time is 6-9h.

[0052] b. Treating the molecular...

preparation example 1-6

[0069] Preparation Examples 1-6 respectively provide a method for preparing molecular sieves loaded with copper oxide. The difference between Preparation Examples 1-6 lies in the different parameters in the preparation methods, as shown in Table 1 for details.

[0070] The preparation method of the above-mentioned molecular sieve loaded with copper oxide specifically comprises the following steps:

[0071] a. Modification of the HZSM-5 molecular sieve: modify the HZSM-5 molecular sieve with a modifier, and dry at high temperature to obtain the molecular sieve A. Wherein, the modifying agent is a mixed solution composed of sodium fluoride, trifluoroacetic acid and sulfuric acid, and the respective addition amounts are shown in Table 1.

[0072] b. Mix the sodium hydroxide solution with the molecular sieve A and fully stir, process the molecular sieve A obtained in step a, and roast at high temperature until dry to obtain the molecular sieve B.

[0073] c. Treating the molecul...

preparation example 7-14

[0077] Preparation Examples 7-14 respectively provide a method for preparing molecular sieves loaded with copper oxide. The difference between Preparation Examples 7-14 and Preparation Example 1 lies in the different parameters in the step of "modification of HZSM-5 molecular sieve", as shown in Table 2 for details.

[0078] Table 2 Parameters in the step of "modification of HZSM-5 molecular sieve" in preparation examples 7-14

[0079]

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Abstract

The application relates to the technical field of bromine-containing hazardous waste treatment, and specifically discloses a method for recovering bromine from hazardous waste liquid containing brominated aromatic hydrocarbons. The preparation method includes: pretreatment of hazardous waste liquid to be treated, hydrolysis reaction, purification and evaporative crystallization; wherein, the hydrolysis reaction is carried out under the action of a catalyst; the catalyst is a molecular sieve loaded with copper oxide, and the preparation method is as follows: a. The HZSM-5 molecular sieve is modified with a modifier, and dried at high temperature to obtain molecular sieve A; the modifier is a mixed solution composed of sodium fluoride, trifluoroacetic acid and sulfuric acid; b. the treatment step of using excess alkaline solution a. The obtained molecular sieve A is filtered and dried at high temperature to obtain molecular sieve B; c. The molecular sieve B obtained in step b is treated with a copper sulfate solution, filtered and dried at high temperature to obtain a copper oxide-loaded molecular sieve. The method for recovering bromine provided by the present application has little corrosive effect on the incineration equipment, and can effectively improve the recovery rate of bromine in the hazardous waste liquid.

Description

technical field [0001] The application relates to the technical field of bromine-containing hazardous waste treatment, more specifically, it relates to a method for recovering bromine from hazardous waste liquid containing brominated aromatic hydrocarbons. Background technique [0002] In recent years, my country has made considerable progress in the production and technology development of bromine series products, especially in the synthesis of inorganic bromides, brominated flame retardants, pharmaceutical intermediates and organic synthesis intermediates. . However, in the production process of bromine series products, a large amount of bromine-containing wastes are often produced. Especially in the field of flame retardants, brominated flame retardants (BFRs) such as polybrominated diphenyl ethers (PBDEs), polybrominated biphenyls (PBBs), tetrabromobisphenol A (TBBPA), and hexabromocyclododecane (HBCD) are low in price, It is widely used because of its high flame retard...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/09B01J29/46
CPCC01B7/096B01J29/46B01J2229/186
Inventor 陈福泰白立强褚永前解迪
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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