Thermodynamics of green process mixtures

拟议的研究将包括对流体混合物热力学性质的理论和实验研究。理论研究将集中于对状态方程的修改，以期将其应用于涉及缔合物种的体系，这些缔合物种的相行为和热性质不能用现有模型准确地表示。实验工作将包括研究具有工业重要性的混合物的相行为，以及测量选定混合物的超额热，这些混合物的组成成分为一种或多种缔合化合物。超临界流体技术经常用于所谓的绿色过程，包括分离过程、化学反应和生化反应过程。复杂物质的再结晶和材料加工，微生物和酶的失活，微生物细胞的破坏和纤维素材料的爆炸，以及其他化学工程过程。超临界流体技术的主要优点是减少工业废物，提高工艺效率，节约能源。由于其特殊的化学和物理特性，二氧化碳已被广泛用作超临界流体技术的选择流体。在这方面，拟议的研究将考察选定的以超临界二氧化碳为组分的绿色过程混合物的相行为。综上所述，拟议研究的主要目的是开发新的信息，这些信息不仅将拓宽我们对重要工业系统的热力学性质的了解，而且可以用于提高基于状态方程的模型在工程应用中的能力。

The proposed research will consist of both theoretical and experimental studies of the thermodynamic properties of fluid mixtures.  The theoretical study will focus on the modification of an equation of state with a view to extending its application to systems involving associating species whose phase behaviour and thermal properties cannot be accurately represented by the existing models.  The experimental work will consist of the study of the phase behaviour of industrially important mixtures and the measurement of excess enthalpies of selected mixtures involving one or more associating compounds as the constituent components.  Supercritical fluid technologies are frequently used in the so-called green processes including the separation processes, the chemical and biochemical reaction processes, the re-crystallization and materials processing of complex substances, the inactivation of microorganisms and enzymes, the disruption of microbial cells and explosion of cellulose materials, and other chemical engineering processes.  The main advantages of supercritical fluid technologies are the reduction of industrial wastes, the improvement of process efficiencies, and the saving of energy.  Owing to its special chemical and physical characteristics, carbon dioxide has been widely used as a choice fluid in the application of supercritical fluid technologies.   In this connection, the proposed research will investigate the phase behavior of selected green process mixtures that involve supercritical carbon dioxide as a component.  In summary, the main objectives of the proposed research are to develop new information that will not only broaden our knowledge of the thermodynamic properties of industrially important systems but also can be used to improve the capability of equation-of-state-based models for engineering applications.