非随机双液体模型（英语： Non-Random Two-Liquid Model [1] ），简称NRTL模型，是一个描述化合物活性系数（ ）与液相莫耳分率（ ）关系的活性系数模型。 经常被应用于 化学工程 领域以进行 相平衡 计算。

2025年1月13日 · Because water is commonly used as a solvent and many electrolytes are present in bioprocesses, the electrolyte nonrandom two-liquid (NRTL) model (6−8) is a suitable choice for considering the effect of interactions between the components (interaction effects) in the simulation of industrial bioprocesses.

Calculate and return the excess Gibbs energy of a liquid phase represented by the NRTL model. Calculates and return the G terms in the NRTL model for a specified temperature. Calculates and return the alpha terms in the NRTL model for a specified temperature.

2004年4月1日 · A simple modification of the NRTL equation proposed in a previous work is the basis for a new predictive method to calculate VLE of binary liquid systems. The only analytical modification of the NRTL consists in inserting the ratio of the molar volumes of the pure compounds as a multiplying factor of the binary parameters G ij and G ji .

2010年2月25日 · Using the extended NRTL model, mean deviation of the computed mole fractions decreased by approximately four times (9.73 × 10 −3) compared to the value obtained using the original NRTL model. Both original and extended NRTL models were employed for the simulation of a model mixture separation by extractive distillation.

2014年7月15日 · The nonrandom two-liquid (NRTL) model is an activity coefficient model used widely in phase equilibria calculations. The NRTL model has three adjustable parameters that are determined through regression of experimental data for a specific system.

2019年1月16日 · In this work a new formulation of the problem of regressing NRTL binary interaction parameters from LLE data based on conventional constrained non-linear programming is proposed. In particular, a set of equations to force a positive tangent plane distance over the tie-lines are introduced.

2007年12月5日 · Three different excess Gibbs free energy models are evaluated: the non-random two-liquid (NRTL) model, the universal quasi-chemical (UNIQUAC) model, and the electrolyte−NRTL (eNRTL) model. In the case of eNRTL, a new formulation of the model is used, based on a symmetric reference state.

nrtl-hoc用的是hayden-o‘connell，考虑了中压以下的汽相中的溶和作用和二聚作用。 nrtl-rk用的是redlich-kwong 状态方程，是简单的立方状态方程，适合中压。 此外还有nrtl-nth

2016年1月10日 · NRTL方程的溶液超额自由焓表达式为： (1) 由此得到的活度系数方程为： (2) (3) (4) 其中gji的含义与Wilson方程中λji相似，表示i–j两种不同分子间相互作用的能量参数；参数αji与混合物中的非随机性有关，当αji为零时，混合物完全随机。 对于二元系统，αji即为α12或α21，且α12 = α21。 Renon等根据相似化学理论，通过整理大量二元系统实验数据后发现α12变化约从0.20至0.47，并可根据溶液的不同类型设置不同的α12值。 当实验数据缺乏时，α12的值常可任意规 …