Vapor-Phase (p, ρ, T, x) Behavior and Virial Coefficients for the (Methane + Propane) System

Vapor-Phase (p, ρ, T, x) Behavior and Virial Coefficients for the (Methane + Propane) System
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(甲烷丙烷)系统的气相(p、Ï、T、x)行为和维里系数

DOI:
10.1021/je500792x
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发表时间:
2014
影响因子:
--
通讯作者:
McLinden
McLinden
中科院分区:
工程技术3区
文献类型:
--
作者:
Richter;McLinden

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用双沉降式磁悬浮密度计在248.15 ~ 373.15 K的温度范围内测量了甲烷和丙烷三种混合物的(p,ρ,T,x)行为,压力为露点压力或6 MPa,以较低者为准。重量法制备的混合物的组成为(0.74977、0.50688和0.26579)摩尔分数甲烷。给出了详细的不确定性分析。考虑到所有影响,包括成分不确定度,大多数点的密度相对组合扩展不确定度(k= 2)为0.05%或更低,但密度小于5 kg·m-3时较大。与GERG-2008天然气混合物状态方程的比较表明,密度的显著偏差(高达-1.3%)随着温度的降低,压力的增加和混合物中丙烷含量的增加而增加。并利用实验值计算了该体系的相互作用维里系数B12(T)。B12(T)与文献值吻合较好。正如理论所预期的那样,它们随组成而恒定(在实验不确定性范围内)。与此相反,用GERG-2008状态方程计算的B12(T)随组成而变化。
The (p, ρ, T, x) behavior of three (methane + propane) mixtures was measured with a two-sinker magnetic suspension densimeter over the temperature range of (248.15 to 373.15) K with pressures up to the dew-point pressure or 6 MPa, whichever was lower. The compositions of the gravimetrically prepared mixtures were (0.74977, 0.50688, and 0.26579) mole fraction methane. A detailed uncertainty analysis is presented. The relative combined expanded uncertainty (k= 2) in density considering all effects, including the uncertainty in composition, was 0.05 % or lower for most points, except it was larger at densities less than 5 kg·m–3. Comparisons to the GERG-2008 equation of state for natural-gas mixtures showed significant deviations in density (as large as −1.3 %) that increased with decreasing temperature, with increasing pressure, and with increasing propane fraction in the mixture. The experimental values were also used to calculate interaction virial coefficientsB12(T) for this system. TheB12(T) agreed well with literature values. They were constant (within experimental uncertainty) with composition, as expected from theory. In contrast, theB12(T) calculated with the GERG-2008 equation of state varied with composition.
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