Antisolvent crystallization of anhydrous sodium carbonate at atmosphericalconditions

When antisolvents are applied to crystallize sodium carbonate from aqueous solutions, the transition temperature at which the hydrates are in equilibr ium is decreased. Two models proposed can predict the influence of the amou nt and type of antisolvent on the transition temperature. Only binary data of the water/sodium carbonate system and measured vapor pressures over tern ary soda-saturated mixtures of water and antisolvent ape 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 influen ce of the antisolvent on the a transition temperature with good accuracy. A nhydrous soda with bulk densities of lip to 950 kg/m(3) was crystallized at temperatures as low as 80 degreesC.