T, °C Solubility, g sodium acetate/100 g H2O 30 54.5 65.5 139 40 60
The feed to a continuous crystallizer that can be simulated with the MSMPR model is 5,000 kg/h of 40 wt% sodium acetate in water. Monoclinic crystals of the trihydrate are formed. The pressure in the crystallizer and the heat-transfer rate in the associated heat exchanger are such that 20% of the water in the feed is evaporated at a crystallizer temperature of 40oC. The crystal growth rate, G, is 0.0002 m/h and a predominant crystal size, Lpd, of 20 mesh is desired. Determine the: (a) kg/h of crystals in the exiting magma; (b) kg/h of mother liquor in the exiting magma; and (c) volume in m3 of magma in the crystallizer if density of the crystals=1.45 g/cm3 and density of the mother liquor =1.20 g/cm3 .
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