1,1,2,2-Tetrabromoethane CAS 79-27-6

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1,1,2,2-Tetrabromoethane, yellow liquid, with the odor of camphor and chloroform. It is a chemical substance with the molecular formula of C2H2Br4 and CAS 79-27-6 Insoluble in water, soluble in ethanol, chloroform and other organic solvents. It is unstable, can decompose under light and heat, and its color turns yellow. When the temperature is higher than 190 ℃, the decomposition product is highly toxic carbonyl bromide vapor. React with strong base to release hydrogen bromide. It is stable at room temperature. When heated to 239~242 ℃, it will decompose and release bromine, hydrogen bromide, etc. This product is used as an intermediate of quaternary amine compounds, pharmaceuticals and dyes, and also for the preparation of chemical fiber cocatalyst, initiator of polyester oxidation process, flame retardant, refrigerant, fire extinguishing agent, fumigation disinfectant, etc.

Tetrabromoethane (chemical formula C ₂ H ₂ Br ₄, CAS number 79-27-6) is a symmetrical organic compound containing four bromine atoms. Its unique physical and chemical properties make it irreplaceable in various fields such as chemical engineering, medicine, materials, and environmental protection.

Industrial Basic Applications: Functional Materials in Multiple Fields

 

1. Flame retardant: a core additive that enhances material safety
Tetrabromoethane, as an additive flame retardant, significantly improves the flame retardancy of materials by releasing bromine free radicals to interrupt the combustion chain reaction. Its application coverage:

Building materials: used for flame retardant treatment of polyurethane foam, polystyrene (EPS) and other thermal insulation materials, meeting the requirements of building fire protection specifications. For example, in the insulation layer of high-rise building exterior walls, the addition of tetrabromoethane can make the material meet the B1 level flame retardant standard.

 

Wire and cable: As a flame-retardant component of polyvinyl chloride (PVC) cable sheath, it prevents the spread of electrical fires. Experimental data shows that adding 5% tetrabromoethane to PVC cables increases their oxygen index from 22% to 35%, and the vertical combustion test passes UL94 V-0 level.

Textile: Used for flame retardant finishing of synthetic fibers such as polyester and nylon, endowing fabrics with self extinguishing properties. For example, curtain fabric treated with tetrabromoethane can self extinguish within 5 seconds when exposed to an open flame.

 

2. Refrigerants and fire extinguishing agents: solutions for special scenarios
In the field of refrigeration, tetrabromoethane was once used as a medium to low temperature refrigerant in industrial refrigeration equipment, but its environmental toxicity issues have gradually been replaced by fluorine substitutes.
Fire extinguishing system: Due to its high density and low vapor pressure characteristics, tetrabromoethane has been developed as a substitute for Halon fire extinguishing agents for protecting precision instruments, libraries, and other places. Its fire extinguishing efficiency is three times that of carbon dioxide and leaves no residue.

 

3. Plastic foaming agent: a key component of lightweight materials
In the foaming process of plastics such as polyethylene (PE) and polypropylene (PP), tetrabromoethane is used as a chemical foaming agent to decompose and produce gases such as nitrogen to form a closed cell structure, significantly reducing material density. For example:

Packaging material: It is used to produce light foam boxes. The density can be reduced to 0.02g/cm ³, and the cushioning performance can be improved by 40%.
Building board: In the production of EPS foam board, the addition of tetrabromoethane reduces the thermal conductivity of the board to 0.032W/(m · K), while maintaining flame retardancy.

 

4. Mineral processing solvent: an enhancer for mineral separation
In the flotation process of copper, lead, zinc and other metal ores, tetrabromoethane as an adjusting agent can change the surface hydrophobicity of minerals and improve the grade of concentrates. For example:

Copper ore flotation: Adding 0.5% tetrabromoethane can increase the copper recovery rate from 82% to 88%, while reducing the dosage of reagents by 30%.
Phosphate ore selection: As an inhibitor, it effectively separates apatite from silicate gangue, increasing the P ₂ O ₅ content of concentrate to over 32%.

The dual roles of intermediates and catalysts in the field of fine chemicals

 

1. Pharmaceutical intermediates: key raw materials for drug synthesis
Tetrabromoethane is the core skeleton constructed by various drug molecules, and its bromine atoms can be introduced into specific functional groups through substitution reactions. Typical applications include:

Antibacterial synthesis: As an intermediate used in the preparation of quinolone antibiotics, such as the key intermediate 3,4-difluoroaniline of ciprofloxacin, tetrabromoethane introduces fluorine atom sites through bromination reaction.
Research and development of anti-tumor drugs: In the structural modification of paclitaxel analogs, tetrabromoethane participates in the bromination reaction of the side chain, enhancing the targeting of drugs to cancer cells. The experiment showed that the inhibition rate of derivatives modified with tetrabromoethane on breast cancer cell MCF-7 increased to 85%.

 

2. Dye intermediates: the cornerstone of the color industry
Tetrabromoethane is mainly used as a bromination reagent in dye synthesis, participating in the structural construction of azo dyes and anthraquinone dyes. For example:

Disperse dye: used for synthesizing Disperse Red 60, its brominated structure endows the dye with high temperature stability, suitable for dyeing polyester fibers, with a color fastness of 4-5 levels.
Acid dye: In the synthesis of Acid Red 88, tetrabromoethane introduces sulfonic acid groups through bromination reaction to enhance the water solubility of the dye, making it suitable for dyeing wool and silk.

 

3. Chemical fiber catalysts: synergists for polymerization reactions
In the production of synthetic fibers such as polyester (PET) and nylon (PA), tetrabromoethane as a catalyst can accelerate polymerization reactions and optimize fiber properties. For example:

Polyester oxidation initiator: In the PET condensation process, tetrabromoethane works synergistically with antimony based catalysts to shorten the reaction time by 30% and reduce the amount of by-products generated.
Nylon polymerization regulator: By controlling the amount of tetrabromoethane added, the molecular weight distribution of PA6 can be adjusted, resulting in a 15% increase in fiber strength and a controlled elongation at break of 25% -30%.

Expanding into Emerging Fields: Innovative Applications Driven by Technology

 

1. New energy materials: the breakthrough point of battery technology
Lithium ion batteries: Tetrabromoethane, as an electrolyte additive, can form a stable SEI film on the negative electrode surface, inhibiting lithium dendrite growth. Experiments have shown that adding 1% tetrabromoethane electrolyte can extend the battery cycle life to over 2000 times and achieve a capacity retention rate of 90%.
Sodium ion battery: In the modification of the hard carbon negative electrode, tetrabromoethane introduces defect sites through bromination reaction, improving the efficiency of sodium ion insertion/extraction and increasing the energy density of the battery to 150Wh/kg.

 

2. Environmental Governance: Innovative Solutions for Pollution Control
Heavy metal adsorbent: The resin modified with tetrabromoethane has an adsorption capacity of up to 200mg/g for heavy metal ions such as Pb ² ⁺ and Cd ² ⁺, which is much higher than traditional adsorbent materials.
Organic pollutant degradation: As a photocatalyst precursor, tetrabromoethane can generate reactive oxygen species under ultraviolet light irradiation, which can degrade pollutants such as phenol and dyes in water with a degradation rate of over 95%.

 

3. Electronic materials: auxiliary agents for the semiconductor industry
Photoresist additive: Tetrabromoethane as a crosslinking agent can enhance the heat resistance and corrosion resistance of photoresist, meeting the process requirements below 14nm.
Conductive polymer: In the doping of polyaniline (PANI), tetrabromoethane is used as a p-type dopant to increase the conductivity to 100S/cm, which can be used as a flexible electrode material.

The method discloses a 1,1,2,2-tetrabromoethane process for preparing tetrabromoethane using a microchannel reactor. The raw material bromine is continuously fed into the microchannel reactor under the drive of the power system; Acetylene is continuously introduced into the microchannel reactor through the gas mass flow controller; The incoming acetylene and bromine are fully mixed in the microchannel reactor for reaction; Control the temperature of reactants through the heat exchange system; After the reaction process is completed, the products are collected through the gas-liquid separator; The collected products are added with stabilizer and packaged into products after passing the analysis. The production process of the invention can realize the uniform distribution of acetylene and bromine in the microchannel reactor, make acetylene fully contact with bromine, improve the production efficiency and yield, and improve the utilization rate of raw acetylene; Avoid the formation of explosive mixture of acetylene and air to improve safety; Shorten the process flow, greatly reduce waste water, waste gas and eliminate the generation of by-products.

Tetrabromoethane is obtained by bromination from acetylene. The production process is as follows:

Raw material → synthesis → neutralization → distillation → product

Acetylene gas is generated from calcium carbide in the acetylene generator. After purification and drying, it enters the reactor and reacts with bromine to obtain crude tetrabromoethane. The crude product of tetrabromoethane is subject to alkali washing and water washing to remove acidic substances and water-soluble substances, and then the product of tetrabromoethane is refined by distillation. At present, the reaction of acetylene and bromine is carried out by directly passing the breather pipe into the reactor. After the reaction is completed, it needs to be neutralized by alkali washing, and then distilled to obtain the finished product of tetrabromoethane.

The method provides a production process for preparing tetrabromoethane using a microchannel reactor, including the following steps:

(1) The raw material bromine is continuously introduced into the microchannel reactor driven by the power system;

(2) Acetylene is continuously introduced into the microchannel reactor through the gas mass flow controller;

(3) The incoming acetylene and bromine are fully mixed and reacted in the microchannel reactor; Control the temperature of reactants through the heat exchange system;

(4) After the reaction process is completed, the products are collected through the gas-liquid separator; The collected products are added with stabilizer after passing the analysis, and then packaged into products.

The invention uses a microchannel reactor to prepare 1,1,2,2-tetrabromoethane. The main equipment includes:

(1) Raw material and power system: (a) bromine raw material tank, (b) acetylene raw material tank;

(2) Heat exchange system;

(3) Reaction and heat exchange system;

(4) Finished products and filling system. The bromine raw material tank is a glass-lined tank; Acetylene raw material tank is acetylene cylinder; The microchannel reactor is made of glass, and the finished product tank is a glass-lined tank. Among them, the microchannel reactor in the reaction and heat exchange system is five microchannel glass reactors used in series.

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