Vapor Pressures of High Boiling Compounds such as Biogenic Substances

煤液化产物和天然产物等高沸点化合物的蒸气压是设计分离或提纯设备的重要依据。然而，它们是稀缺的，因此，它是在相关行业的要求，收集其蒸汽压数据系统和预测他们的基础上成功的方法。在本研究中，流动型装置已被开发，以获得准确的蒸汽压数据的高沸点化合物，它是确定的，通过测量萘的蒸汽压，我们的设备有足够的精度。利用本装置，对四氢萘和1-萘酚的蒸气压进行了详细的测量。本文首次测定了l-萘酚在熔点附近低温区的蒸气压数据。高沸点化合物蒸气压的测定一直是精细化学研究的热点，人们迫切希望通过一些成功的方法来预测高沸点化合物的蒸气压。对于工程目的，基于分子结构知识的基团贡献法似乎是非常有用的。目前，人们已经提出了几种预测煤液化产物等高沸点化合物蒸气压的方法。然而，人们发现，他们不能提供良好的结果复杂的分子。因此，本研究考虑了一种新的方法。

The vapor pressures of high boiling compounds such as coal liquefaction products and natural products are essentially important to design separation or purification equipments. Nevertheless, they are scarce and therefore it is required in the related industries to collect their vapor pressure data systematically and to predict them based on a successful method.In the present study, a flow type apparatus has been developed to obtain accurate vapor pressure data of high boiling compounds and it is ascertained, by measuring the vapor pressures of naphthalene, that our apparatus has enough accuracy. Using the present apparatus, the vapor pressures of tetralin and l-naphthol have been carefully measured. The vapor pressure data of l-naphthol were newly determined by the our study in the low temperature region near its melting point. Now, it is continued to measure vapor pressures of high boiling compounds interested in the fine chemistry.It is strongly desired to predict vapor pressures of high boiling compounds by using some successful method. For the engineering purpose, a group contribution method based on the knowledge of molecular structures alone seems to be very useful. Up to data, a few methods have been proposed to predict vapor pressures of high boiling compounds such as coal liquefaction products. However, it is found that they cannot provide good results for complex molecules. Thefore, a new approach is now considered in this study.