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首页> 外文期刊>Journal of industrial and engineering chemistry >An extended critical-scaling equation with a nonlinear order parameter and its use for the fits to vapor/liquid equilibria
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An extended critical-scaling equation with a nonlinear order parameter and its use for the fits to vapor/liquid equilibria

机译:具有非线性阶数参数的扩展临界尺度方程及其在汽/液平衡拟合中的应用

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摘要

A method to extend the region of validity of the critical-scaling equations is presented and is tested by fits to the vapor/liquid equilibria (VLE) of ethane, propane, and n-butane. In this method there are two elements. One of them is to find an appropriate order parameter (OP) and the other one is how to fit the equations to equilibrium data. As for the OP, the nonlinear OP Smith and Ferer proposed [7] has been used. For the critical scaling equations, terms different from those they used have been employed. This leads to better results and physically sounder value of exclusion-volume-like fitting parameter b. As for the fitting method, first the critical parameters, T_c and V_c are determined and then linear regressions for the fits to VLE data have been adopted. Otherwise, nonlinear regressions have to be essentially employed.
机译:提出了一种扩展临界比例方程的有效范围的方法,并通过拟合乙烷,丙烷和正丁烷的气/液平衡(VLE)进行了测试。在此方法中,有两个元素。其中之一是找到合适的阶数参数(OP),另一种是如何使方程适合平衡数据。对于OP,已经使用了非线性OP Smith和Ferer提出的方法[7]。对于临界比例方程式,已使用了与所用术语不同的术语。这样可以得到更好的结果,并且体积类似的拟合参数b在物理上更合理。对于拟合方法,首先确定关键参数T_c和V_c,然后采用线性回归对VLE数据进行拟合。否则,必须使用非线性回归。

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