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Antisolvent crystallization of anhydrous sodium carbonate at atmospherical conditions
Author(s) -
Oosterhof Harald,
Witkamp GeertJan,
van Rosmalen Gerda M.
Publication year - 2001
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690470310
Subject(s) - anhydrous , sodium carbonate , ternary operation , aqueous solution , crystallization , ethylene glycol , chemistry , diethylene glycol , sodium , carbonate , inorganic chemistry , thermodynamics , chemical engineering , organic chemistry , physics , computer science , engineering , programming language
When antisolvents are applied to crystallize sodium carbonate from aqueous solutions, the transition temperature at which the hydrates are in equilibrium is decreased. Two models proposed can predict the influence of the amount and type of antisolvent on the transition temperature. Only binary data of the water/sodium carbonate system and measured vapor pressures over ternary soda‐saturated mixtures of water and antisolvent are needed. To validate the two models, continuous crystallization experiments were carried out at various temperatures using ethylene glycol (EG) and diethylene glycol (DEG) as antisolvent, in varying concentrations. Both models predict the influence of the antisolvent on the transition temperature with good accuracy. Anhydrous soda with bulk densities of up to 950 kg/m 3 was crystallized at temperatures as low as 80°C.