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How is ammonia used in the Solvay process for producing soda ash?
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ammonia
Ammonia and amines have a slightly flattened trigonal pyramidal shape with a lone pair of electrons above the nitrogen. In quaternary ammonium ions, this area is occupied by a fourth substituent.
In the Solvay process (also known as the ammonia-soda process), ammonia acts as a critical reagent that is recycled throughout the production of soda ash (sodium carbonate).
The process functions as follows:
- Reaction: A strong brine of sodium chloride is treated with ammonia and carbon dioxide. This reaction produces sodium bicarbonate and ammonium chloride.21
- Product Formation: The sodium bicarbonate is heated to yield the final product, sodium carbonate.21
- Regeneration: The ammonium chloride byproduct is treated with lime, which releases ammonia and produces calcium chloride. This regenerated ammonia is then fed back into the start of the process.21
Because the economic viability of the Solvay process depends on the efficient recovery of ammonia, plants are designed to minimize losses, often keeping them to less than 0.1 percent of the product's weight.2