摘要：To accurately predict the thermodynamic behavior of wax phase in oil field gathering and transportation systems, this study developed a novel thermodynamic phase equilibria model for wax precipitation in paraffin mixtures over a wide temperature and pressure region. Based on isothermal flash calculation with stability testing, the model can accurately predict wax precipitated amount and its corresponding composition in the wax phase. The volume-translated PR equation of state, combined with the LCVM mixing rule, described the vapor–liquid phase, while the Predictive Wilson activity model calculated the non-ideality of the solid phase by incorporating the pressure influence from the Poynting term. Inspired by the melting characteristics of wax, the liquid–solid equilibrium ratio as a good initial value for stability testing is adopted to check for the existence of the wax phase. Additionally, this study proposed a new approach to calculate the temperature of wax disappearance conveniently utilizing the tangent-plane-distance (TPD) function. Analyzing the relationship between wax disappearance temperature and TPD function and comparing it with experimental data validate the approach. Also, a number of example calculations demonstrate the robustness and efficiency of the waxy phase equilibrium model, which can effectively address the convergence and continuity issues of the phase boundary. ? 2025 Elsevier Ltd

ISSN号：0016-2361

卷、期、页：卷401

发表日期：2025-12-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Fuel

参与作者：姚海元,陈海宏

通讯作者：陈好奇,郭恩岐,康琦

第一作者：史博会,宋尚飞,吴海浩,宫敬

论文类型：期刊论文

论文概要：陈好奇,史博会,郭恩岐,宋尚飞,康琦,姚海元,陈海宏,吴海浩,宫敬，A thermodynamic model with stability testing for wax precipitation in paraffin systems，Fuel，2025，卷401

论文题目：A thermodynamic model with stability testing for wax precipitation in paraffin systems