German Notes on BAT of the production of

The annual world production of sodium carbonate (soda) amounted to approximately 31,5 million tons in 1993. The main share is synthetic soda. Nowadays it is only manufactured by means of the Solvay technology, which – as it uses NH3 as auxiliary material – is also called „ammonia soda process“. Approximately 35 % of the world production is natural soda, mainly manufactured in the USA.