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A process used to produce large quantities of soda ash from sodium chloride, ammonia, and carbon dioxide.
[After Ernest Solvay.]
(Chemical Engineering) an industrial process for manufacturing sodium carbonate. Carbon dioxide is passed into a solution of sodium chloride saturated with ammonia. Sodium bicarbonate is precipitated and heated to form the carbonate
[C19: named after Ernest Solvay (1838–1922), Belgian chemist who invented a process using salt, limestone, and ammonia]