A re-entrant resonator for the measurement of phase boundaries:: dew points for {0.4026CH4+0.5974C3H8}
A re-entrant resonator for the measurement of phase boundaries:: dew points for {0.4026CH4+0.5974C3H8}
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DOI：
10.1016/j.jct.2004.11.004
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发表时间：
2005-07-01
影响因子：
2.6
通讯作者：
Goodwin, ARH
中科院分区：
文献类型：
--
作者：
Kandil, ME;Marsh, KN;Goodwin, ARH
对于天然气，特别是反凝析油，沿着已知（液+气）两相区内的液-气体积比的（液+气）相边界对于勘探和生产是重要的。这些流体的性质可以通过大量的方法来测量，在这里，我们报告的方法的基础上测量的谐振频率的最低阶电感电容模式的凹腔能够在温度高达473 K和压力低于20 MPa。在T < 340 K时，用该仪器测量了{0.4026CH（4）+ 0.5974C（3）H（8）}的露点压。测得的露点压力相差小于0.5%，从文献中报道的那些，这是从测量与实验技术，遭受相当不同的潜在来源的系统误差比这里使用的射频谐振器的插值获得的值。根据NIST 14和Peng-Robinson状态方程估计的露水压力在以下范围内：
For a natural gas and, especially, retrograde condensates, it is important for exploration and production that the (liquid + gas) phase boundary be known along with the ratio of liquid-to-gas volumes within the (liquid + gas) two-phase region. These fluid properties can be measured by a plethora of methods and here we report a method based on the measurement of the resonance frequency of the lowest order inductive-capacitance mode of a re-entrant cavity capable of operating at temperatures up to 473 K and pressures below 20 MPa. This instrument has been used to measure, at T < 340 K, the dew pressures of {0.4026CH(4) + 0.5974C(3)H(8)}. The measured dew pressures differ by less than 0.5% from values obtained by interpolation of those reported in the literature, which were determined from measurements with experimental techniques that suffer from quite different potential sources of systematic error than the radio-frequency resonator used here. Dew pressures estimated from both NIST 14 and the Peng-Robinson equation of state lie within