Zinc Bromide
Overview
Zinc bromide (ZnBr₂) is an inorganic compound composed of zinc and bromine. It is commonly found as a white crystalline solid and is highly soluble in polar solvents. The compound is notable for its hygroscopic nature, often forming hydrates when exposed to moisture. Industrially, zinc bromide is synthesized by reacting zinc oxide or zinc metal with hydrobromic acid. Its versatility in chemical reactions and stability under various conditions make it valuable in multiple industrial applications.
Physical and Chemical Properties
Zinc bromide exhibits a high melting point of 394°C and a boiling point of 697°C, indicating its thermal stability. Its density is 4.22 g/cm³, and it forms colorless, deliquescent crystals. The compound is highly soluble in water, ethanol, and ether, facilitating its use in liquid-phase reactions. As a Lewis acid, zinc bromide catalyzes organic reactions such as Friedel-Crafts alkylation. It also forms complexes with amines and other ligands, expanding its utility in coordination chemistry. Its hygroscopicity necessitates careful storage to prevent degradation.
Main Applications
In organic synthesis, zinc bromide serves as a catalyst and reagent for reactions like bromination and cyclization. The photography industry uses it in emulsion formulations for light-sensitive materials. It is also a key component in zinc-bromine flow batteries due to its high ionic conductivity. Additionally, zinc bromide is employed in nuclear reactors as a shielding material to absorb gamma radiation. Its transparency to neutrons makes it suitable for this specialized application. Other uses include oil well drilling fluids and corrosion inhibitors.
Safety and Storage
Zinc bromide poses moderate health risks, causing skin and eye irritation upon contact. Inhalation of dust or fumes may lead to respiratory discomfort. Proper personal protective equipment (PPE), including gloves and goggles, is essential during handling. Storage requires airtight containers in a cool, dry environment to prevent moisture absorption. Incompatible with strong oxidizing agents, it should be kept away from reactive chemicals. Spills should be neutralized with sodium carbonate and disposed of according to local regulations.
B2B Procurement Guide
When procuring zinc bromide, prioritize suppliers with certifications like ISO 9001 or GMP to ensure quality. Key specifications include purity (≥98%), particle size, and absence of heavy metal contaminants. Packaging should be moisture-proof, typically in polyethylene-lined drums or bags. Bulk purchases (≥100 kg) often reduce costs by 10-20%. Request Material Safety Data Sheets (MSDS) and batch analysis reports. For international shipments, confirm compliance with transportation regulations (e.g., UN3077 for hazardous solids).
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