The aqueous solubility of sodium perchlorate during 313.15-338.15 K(40-65 ℃)was measured through gravimetric method and the solubility curve versus temperature was obtained.Then Apelblat equation,polynomial equation and Van't Hoff equation were applied to correlate and fit the solubility data.The supersaturation and metastable zone width of sodium perchlorate were tested in use of laser method.The effects of temperature,stirring rate and cooling rate on the metastable zome width and crystal morphology of sodium perchlorate were investigated.The results show that the aqueous solubility,whose optimal fitting accuracy can be achieved in Van't Hoff equation,increases with temperature increasing.The metastable zone narrows with higher temperature,faster stirring rate and lower cooling rate.Under the condition of 40-65 ℃,250 r/min stirring rate and 0.3 K/min cooling rate,sodium perchlorate crystals with well-defined crystal form can be obtained,which can contribute data support and theoretical insights for resolving the problems such as crystal aggregation and instability of crystals during the industrial crystallization.
关键词
高氯酸钠/结晶/溶解度/超溶解度/介稳区
Key words
sodium perchlorate/crystallization/solubility/supersaturation/metastable zone
维普
万方数据