激光法测定硫氰酸铵结晶介稳区宽度

Measurement of Crystallization Metastable Zone Width of Ammonium Thiocyanate with Laser Scattering Method

用激光法测定了不同温度下硫氰酸铵在水、甲醇、乙醇和w(乙醇)=95%4种溶剂体系中的溶解与超溶解特性,得到硫氰酸铵在不同温度下不同溶剂中的介稳区宽度。结果表明,硫氰酸铵在4种溶剂体系中介稳区宽度均随温度的升高而降低。在相同温度下,硫氰酸铵在水、甲醇、乙醇和w(乙醇)=95%中介稳区宽度顺序为:水<甲醇<w(乙醇)=95%<乙醇。

The saturated and supersaturated characteristics of ammonium thiocyanate in water, methanol, ethanol and w （ethanol） = 95% aqueous solution at different temperatures were investigated by using the laser detection technique. The crystallization metastable zone width of ammonium thiocyanate was obtained at different temperatures in the above four solvents. The results indicated that the metastable zone width of ammonium thiocyanate decreases with increasing temperature. At the same temperature, the metastable zone width of ammonium thiocyanate ranks as follows ： water 〈 methanol 〈 w （ethanol） = 95 % aqueous solution 〈 ethanol.