Abstract Large quantities of volatile and flammable liquids are used in extraction process, which are recognized as having a high fire potential. The flash point is one of the major physical properties used to determine the fire and explosion hazards of liquids. The flash point variation and the fire risk were studied for the extraction system. Experimental results were firstly presented for three ternary systems (diluent being phase 1: n-dodecane, kerosene or p-xylene; phase 2: water; phase modifier: n-butanol) and the binary pairs. The diluent is almost immiscible in water and the reverse also holds. It is assumed that only phase modifier distributes between two phases so that the partition ratio was used to estimate the equilibrium liquid composition in accordance with Nernst’s distribution law. A simple and reliable flash-point prediction model was developed based on the Liaw algorithm for binary miscible mixture, and the flash point prediction of the heterogeneous ternary system was reduced to that of a binary miscible system. The deviations between the predicted values and experimental data were mostly within 2.5°C.

中文翻译：

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三元萃取系统闪点测量及简化预测模型研究

摘要 提取过程中使用了大量易挥发、易燃的液体，被认为具有很高的火灾隐患。闪点是用于确定液体火灾和爆炸危险的主要物理特性之一。研究了萃取系统的闪点变化和火灾风险。首先展示了三个三元系统（稀释剂为第一相：正十二烷、煤油或对二甲苯；第二相：水；相改性剂：正丁醇）和二元对的实验结果。稀释剂几乎不溶于水，反之亦然。假设只有相改性剂分布在两相之间，以便根据能斯特分布定律使用分配比来估计平衡液体组成。基于Liaw算法建立了一种简单可靠的二元混相混合物闪点预测模型，将非均相三元体系的闪点预测简化为二元混相体系的闪点预测。预测值与实验数据的偏差大多在 2.5°C 以内。