Lithium bromide (LiBr) is a white, hygroscopic solid. The hygroscopic nature makes it a versatile chemical that can be put to various end uses. It is usually sold in anhydrous form or in aqueous solutions of varying concentrations.
The salt is produced by reaction between lithium carbonate and hydrobromic acid. Alternatively, it is also produced by bromination of lithium hydroxide.
Hydrobromic acid lithium salt
LiBr acts as sedative and is used in treatment of bipolar disorders. It is also a medical humectant.
The bromide finds its major application in some air conditioning systems, whereby its 55-60% aqueous solution is used as desiccant (phenomenon of absorption chilling).
The salt is further applied in various processes such as:
|Absorption of water vapors (vapor absorption media)|
|Catalyst in dehydrogenation reactions|
|Low temperature heat exchange processes|
|Carbonyl compound condensations with active methylene compounds|
|Some alkylation reactions|
|Inexpensive catalyst in epoxide ring opening using amines|
|Deprotonation and dehydration of organic molecules possessing acidic protons|
|Purification of steroids|
Reconstitution of brines, electrolyte component in Li batteries, and welding flux are some of the feeble uses of LiBr.
|Appearance||–||White to off-white hygroscopic powder|
|Solubility||–||Soluble in water|
|pH of 10% aqueous solution||–||7.5 – 10.5|
|Loss on drying||%||Max 1.0|
The product is stored at ambient temperature.
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