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Recycling method for recycling brominated aromatic hydrocarbon-containing hazardous waste

A technology for hazardous waste and brominated aromatics, applied to chemical instruments and methods, alkali metal bromides, water pollutants, etc., can solve the problems of reducing the service life of incinerators, equipment corrosion, and high treatment costs, and shorten the hydrolysis reaction time , reduce corrosion, improve the effect of adsorption

Inactive Publication Date: 2021-08-31
GO HIGHER ENVIRONMENT GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main treatment method for the above-mentioned rectification raffinate / slag containing brominated aromatic hydrocarbons is incineration, which can be directly incinerated in an incinerator to achieve harmless treatment. Due to the high bromine content in the bromine-containing rectification raffinate / slag, A large amount of hydrogen bromide gas will be produced during the incineration process, which needs to be treated through flue gas treatment such as a large amount of lye absorption, which will cause high processing costs, and cause serious corrosion to equipment, reducing the service life of the incinerator

Method used

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  • Recycling method for recycling brominated aromatic hydrocarbon-containing hazardous waste

Examples

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Embodiment 1

[0070] Get 100kg of waste liquid from a certain bromine manufacturer, the main component in the waste liquid is polybrominated biphenyls. The waste liquid was detected by ion gas chromatography (ISO 10304-1-2007), and the bromine content was 36wt%. The organic bromine was 35wt% and the inorganic bromine was 1wt%.

[0071] A kind of recycling method of hazardous waste containing brominated aromatic hydrocarbons of the present embodiment comprises the following steps:

[0072] Step 1. Preprocessing

[0073] Under normal temperature, use 10 kg of sodium hydroxide alkali solution with a concentration of 5% to wash the waste liquid, stir at a stirring speed of 150 r / min for 20 min, then separate the liquids and let stand for 45 min; obtain 12 kg of the upper layer of alkali washing liquid and 98 kg of the lower layer of waste liquid ;

[0074] Step 2. Hydrolysis

[0075] Put all the waste liquid in the lower layer into the hydrolysis reactor, add 64.2kg of 30% sodium hydroxide s...

Embodiment 2

[0086] Get the waste liquid of a certain bromine manufacturer in 100kg embodiment 1.

[0087] The difference between the recycling method of hazardous waste containing brominated aromatic hydrocarbons in this example and Example 1 is that the catalyst used in step 2 is molecular sieve-loaded copper oxide; molecular sieve-loaded copper oxide adopts HZSM-5 molecular sieve, and Among them, the loading of copper oxide is 30wt%, and the specific surface area is 280m 2 / g;

[0088] When the hydrolysis reaction reached equilibrium in step 2, it took 7 hours; finally 48.7kg of sodium bromide product was obtained, and the recovery rate of sodium bromide was 95.77%.

Embodiment 3

[0090] Get the waste liquid of a certain bromine manufacturer in 100kg embodiment 1.

[0091] The difference between the recycling method of a kind of brominated aromatic hydrocarbon-containing hazardous waste resources of the present embodiment and embodiment 1 is that the catalyst used in step 2 is copper powder; the particle diameter of the copper powder is 3mm;

[0092] When the hydrolysis reaction reaches equilibrium in step 2, it takes 8 hours;

[0093] Finally obtain 48.6kg sodium bromide product, the rate of recovery of sodium bromide is 95.57%.

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Abstract

The invention relates to the technical field of bromine-containing hazardous waste treatment, and particularly discloses a recycling method for recycling brominated aromatic hydrocarbon-containing hazardous waste. The method comprises the following steps: (1) pretreatment: separating inorganic bromine from organic bromine in the waste to obtain an upper-layer alkali washing liquid and a lower-layer waste liquid; (2) hydrolysis: controlling the temperature at 300-400 DEG C and the pressure at 20-30 MPa, adding a sodium hydroxide aqueous solution with the concentration of 20-30% into the lower-layer waste liquid in the step (1), and carrying out hydrolysis reaction; (3) separating; and (4) purifying to obtain a sodium bromide product. According to the method, the recycling rate of sodium bromide can reach 95% or above, the purity meets the first-grade product standard, the hydrolysis reaction time is greatly shortened, and the treatment efficiency is improved; and the waste liquid is prevented from being directly incinerated to generate a large amount of acid gas such as hydrogen bromide, corrosion to treatment equipment is reduced, and harmless and resourceful bromine treatment and recovery of the brominated aromatic hydrocarbon-containing hazardous waste are achieved.

Description

technical field [0001] This application relates to the technical field of bromine-containing hazardous waste treatment, and more specifically, it relates to a recycling method for bromine-containing aromatic hydrocarbon hazardous waste recycling. Background technique [0002] Bromine is an important chemical raw material, and a wide variety of inorganic bromides, bromates and bromine-containing organic compounds derived from it have special value in the development of national economy and science and technology. After the rapid development in the past ten years, especially in recent years, my country has made great progress in the production and technology development of bromine series products, especially in inorganic bromides, brominated flame retardants, pharmaceutical intermediates and organic synthesis intermediates Great progress has been made in the synthesis and other aspects. [0003] Among them, organic bromine series fine chemical products with hydrogen bromide or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/10C02F1/00C02F1/04C02F1/28C02F1/66
CPCC01D3/10C02F1/00C02F1/04C02F1/283C02F1/66C02F2101/36
Inventor 陈福泰白立强褚永前解迪
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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