Application of NMR to Transport Phenomena in Hydrocarbon CO2 Mixtures

摘要CTS-9321887 William Marsh Rice University P.I.： 小林力 本文提出了一个新的适用于稠密流体相中各种烃类的粘度和质子自旋-晶格弛豫速率的五参数扩展对应态模型。 简单的混合规则允许扩展的模型的混合物。 所提出的模型带来了改进的粘度模型的伊利和汉利1，2，环状和支链烷烃，以及它们的混合物与正构烷烃。 质子自旋-晶格弛豫速率R1的对应态处理产生了饱和烃的R1与温度之间的新的相关性，跨越了三种不同的自旋弛豫过程（即自旋-旋转、分子内和分子间偶极-偶极机制）。 对于纯流体和混合流体，{符号104 \f“符号”}之间的精确相关性被生成，观察到的均方根偏差小于8.0%。 这种新方法利用形状因子3来正确预测p-v-t表面;以及两个额外的常数来解释传输。 新的参数，{SYMBOL 103 \f“Symbol”}表示粘度，{SYMBOL 98 \f“Symbol”}表示R1，主要来自多原子分子的受阻旋转。 四参数对应状态的治疗，只利用形状因子3，产生可比的准确性，当仅限于长链烷烃的相关性。

ABSTRACT CTS-9321887 William Marsh Rice University P. I.: Riki Kobayashi A new five-parameter extended corresponding states model has been developed for viscosity and proton spin-lattice relaxation rate applicable to a variety of hydrocarbons in the dense fluid phase. Simple mixing rules allows extension of the model to mixtures. This proposed model is shown to bring improvements over the viscosity model of Ely and Hanley 1, 2 , for cyclic and branched alkanes, and their mixtures with n-paraffins. The corresponding states treatment of the proton spin-lattice relaxation rate, R1, yields a new correlation between R1 and temperature for saturated hydrocarbons, spanning three different processes of spin relaxation (i.e. spin-rotation, intramolecular and intermolecular dipole-dipole mechanisms). Accurate correlations between {SYMBOL 104 \f "Symbol"} are generated for pure and mixed fluids, with observed root-mean-square deviations of less than 8.0%. This new approach utilizes shape factors 3 to properly predict p-v-t surfaces; and two additional constants to account for transport. The new parameters, {SYMBOL 103 \f "Symbol"} for viscosity, and {SYMBOL 98 \f "Symbol"} for R1, mainly arise from hindered rotation of polyatomic molecules. The four-parameter corresponding states treatment, utilizing only the shape factors 3 , yields correlations of comparable accuracy, when confined to long-chain alkanes.