Abstract This work reports vapor pressures and vaporization enthalpies of 1-nonadecanol, isophytol, 2E- and 2Z-phytol, and the phytol found naturally, (2E,7R,11R)-phytol. Both phytol and isophytol are important commercial substances. 2E and 2Z-phytol exhibit a variety of useful pharmaceutical properties, are used in many fragrance formulations, and have been approved as a food flavor in the US. Isophytol also exhibits a similar fragrance and flavor profile and is an intermediate in the synthesis of vitamins E and F1. Vaporization enthalpies at T = 298.15 K are evaluated as are vapor pressures from T = (298.15 to 450) K for the phytols and from T = (298.15 to 550) K for 1-nonadecanol. Reasons for the variations in the temperature range studied are discussed. Vapor pressures are fit to a second order polynomial. Results for 1-nonadecanol at elevated temperatures are in good agreement with previous work. Vapor pressures for isophytol at elevated temperatures are in qualitative agreement with previous literature values but the calculated vaporization enthalpy at T = 454.1 K evaluated in this work differs significantly from the literature value calculated using previously reported vapor pressure data.

中文翻译：

---

1-十九醇的蒸气压和蒸发焓。异植醇、2 Z- 和 2 E-植醇以及 (2E,7R,11R) 植醇，通过相关气相色谱法测定

摘要 这项工作报告了 1-十九烷醇、异植醇、2E- 和 2Z-植醇以及天然存在的植醇 (2E,7R,11R)-植醇的蒸气压和蒸发焓。植醇和异植醇都是重要的商业物质。2E 和 2Z-植醇表现出多种有用的药物特性，用于许多香料配方中，并已在美国被批准用作食品香料。异植醇也表现出类似的香味和风味特征，是合成维生素 E 和 F1 的中间体。在 T = 298.15 K 时的蒸发焓被评估为从 T = (298.15 到 450) K 的植物醇和从 T = (298.15 到 550) K 的 1-十九烷醇的蒸气压。讨论了研究温度范围变化的原因。蒸汽压力适合二阶多项式。1-十九醇在升高的温度下的结果与之前的工作非常一致。高温下异植醇的蒸气压与先前的文献值定性一致，但在本工作中评估的 T = 454.1 K 时计算的蒸发焓与使用先前报告的蒸气压数据计算的文献值显着不同。