1961 年 81 巻 7 号 p. 976-980
Thermostatic dehydration rate of A, B, and C crystals of calcium pyruvate isoniazone hydrate was measured in a temperature range of 30-130°. From the dehydration rate, αi, obtained in this experiment, linear fraction of dehydration is defined as ξi=1-(1-αi)1/3. ξi increases in proportion to time. Activation energy of each of the hydrated crystals was calculated and it was found that 4 moles of water in A crystal, 1 mole of water in B crystal, and 2.5 moles of water in C crystal are more easily liberated than other water of crystallization. Of these three kinds of crystals, B crystal was found to be the easiest to be dehydrated and C crystal, the hardest to become an anhydrate.