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提出一种计算和分析含化学反应真实溶液体系相平衡问题的方法——元素组成法. 定义元素(可以是原子、分子或原子团)的含义, 推导得到元素组成与组分组成之间的数学关系. 从热力学角度进一步明确元素化学位的概念及其物理意义, 用热力学方法推导出元素的化学位与物质的化学位之间的数学关系式, 进而得到用元素化学位表示的含化学反应非理想体系的相平衡方程. 基于元素组成, 提出了一个形式简单的“元素反应共沸点”的充分和必要条件, 其数学形式与非化学反应体系的“共沸点”的充分和必要条件相似. 所提出的方法适用于含化学反应非理想体系的相平衡问题的计算和分析, 而且计算可得到降维简化. 计算了几个实例, 表明这是一个通用和有效的方法.
A method to calculate and analyze the phase equilibrium problem of the solution system containing chemical reaction - Element composition method is used to define the meaning of element (which can be atom, molecule or atomic group) and to derive the mathematical relation between element composition and component composition From the thermodynamic point of view, the concept of elemental chemical position and its physical meaning are further clarified, and the mathematical relation between the chemical position of the element and the chemical position of the substance is deduced by the method of thermodynamics, and then the chemical reaction nonidealities Phase equilibrium equation of the system is proposed.Based on the elemental composition, a sufficient and necessary condition for the simple “elemental reaction azeotropic point” is proposed, and its mathematical form is similar to the sufficient and necessary condition for the “azeotropic point” of the non-chemical reaction system. Is suitable for the calculation and analysis of the phase equilibrium problem of chemical reactions with non-ideal system, and the calculation can be simplified to reduce the dimension.A few examples are calculated, which shows that it is a general and effective method.