第45卷第6期
石油与天然气化工
CHEMICAL ENGINEERING OF OIL & GAS
液化石油气物性规律的研究邓凡锋周鑫李志昂董了瑜郑力文方正
中国测试技术研究院
摘要通过Peng-Robinson方程建立模型对LPG物性随温度、压力的变化规律进行求解，并通过配制丙烷和正戊烷的标准物质对所建模型的准确性进行验证。结果表明，模型可以很好地与工程实践经验公式Antoine法吻合，模型可靠准确;LPG的饱和蒸气压随温度的升高呈现出几何倍数的增加趋势；温度升高使气相组分密度升高，液相组分密度降低：在同一温度条件下,LPG液相组成恒定时的饱和蒸气压相同；在规定的双组分标准物质体系中，得到丙烷和正戊烷液相组成的拟合方程Y1三—2.0923E—5X+1.0025,Y2=0.01132e-X/256.62+0.01089(Y为液相中的质量分数，X为压力）。
关键词液化石油气PR方程温度压力标准物质拟合方程
中图分类号：TE622
文献标志码：A
D0I:10.3969/j.issn.1007-3426.2016.06.017
Study on physical properties of liquefied petroleum gas DengFanfeng,Zhou Xin,Li Zhiang,DongLiaoyu,ZhengLiwen,FangZheng(National Institute of Measurement and Testing Technology ,Chengdu 610021, China)
Abstract: In this paper, the change law of LPG physical properties with temperature and pressure was solved by the Peng-Robinson equation . And the accuracy of the calculation model was verified by using the reference material of propane and n-pentane . The results showed that the model was reliable and accurate which could accord with engineering practice experience Antoine formula . Saturated vapor pressure of LPG increased geometric linearly as temperature went up . Liquid phase density decreased and gas phase density went up with temperature increasing - Saturated vapor pressure of LPG with constant liquid phase composition was equal at the same temperature . In the prescribed aeiaeneaeeasaseaeeesaoooo =-2.092 3E5X+1.002 5,Y2 0.011 32e-x/256.62+0.010 89(Y represented the mass fraction in the liquid phase, Xrepresented pressure).
Key words: liquefied petroleum gas, Peng-Robinson equation, temperature, pressure, reference material,fitting equation
液化石油气（LPG)用途广泛，可作为理想的民用燃气和车用燃料，是生产丙烯和丁烯的化工原料，可芳构化制备轻质芳烃或高辛烷值汽油1-3]。LPG各组分
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的沸点和饱和蒸气压各不相同，饱和蒸气压低、沸点高的组分更易发生液化。反之，饱和蒸气压高、沸点低的组分更易发生气化。各组分的物性差别使得LPG的
基金项目：四川省科技支撑计划项目“计量测试关键技术研究及检测检验科技服务平台应用示范”（2015GZ0084）；四川省科技支撑计划项目四川省科技服务业检验检测综合公共服务平台建设示范项目”(2015GFW0046)。
作者简介：邓凡锋(1987一）,男，硕士，毕业于中国石油大学(北京)化工学院，主要从事化学计量标准物质的研究。E-mail： peakdeng .6@163.com
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