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    • 10. 发明授权
    • Rapid method for determining critical vapor pressure
    • 用于确定临界蒸气压的快速方法
    • US5266492A
    • 1993-11-30
    • US975641
    • 1992-11-13
    • Ray W. WoodLee D. HansenJohn W. Crawford
    • Ray W. WoodLee D. HansenJohn W. Crawford
    • G01N25/48G01N25/56G01N7/16G01N25/20
    • G01N25/56G01N25/4846
    • A method of determining the critical vapor pressure of a hygroscopic material, such as a drug. A drug sample is placed in a substantially isothermal environment. A vapor, such as water vapor, at a given pressure is then placed in the ambient air over the drug. The rate of heat production from this sample at the given water vapor pressure, or the humidity of the air above the sample, is then measured. The water vapor pressure over the drug is gradually increased. Simultaneously, the rate of increase in heat production from the drug sample, or the rate of change of the relative humidity of the air above the drug sample, is measured. A marked increase in the rate of heat production generated by the drug, or a marked change in the relative humidity of the air over the sample, signals the attainment of the critical water vapor pressure.
    • 确定吸湿材料如药物的临界蒸气压的方法。 将药物样品置于基本上等温的环境中。 然后在给定压力下的蒸气(例如水蒸汽)被放置在药物上的环境空气中。 然后测量在给定水蒸气压下该样品的热量产生率或样品上方空气的湿度。 药物上的水蒸汽压力逐渐增加。 同时,测定药物样品的产生热量的增加率,或药物样品上方的空气相对湿度的变化率。 药物产生的热量产生明显增加,或样品上空气的相对湿度发生明显变化,表明达到临界水汽压力。