アイソトープ分離のための蒸留計算法

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  • Distillation Calculation Method for Isotope Separations.
  • アイソトープ ブンリ ノ タメ ノ ジョウリュウ ケイサンホウ

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Some isotopes are separated and concentrated by distillation. The characteristics of isotope distillation due to extremely low relative volatilities compared with ordinary distillation columns are as follows : 1) a large number of theoretical plates ; 2) high reflux ratio ; and 3) constant vapor and liquid flows due to the same chemical and physical properties except vapor pressure which require no enthalpy balances on each plate. Two distillation calculation algorithms I and II based on the Newton-Raphson method are proposed : algorithm I whose submatrix dimensions are 2 m, in which the vapor-liquid equilibrium ratio is a function of only liquid compositions and algorithm II whose submatrix dimensions are 2 m+ 1, in which the equilibrium ratio of vapor and liquid equilibrium relationships is a functions of only temperature, where m is the number of components. Numerical examples are shown for the above two algorithms : As the first example, a distillation process of nitric oxide is proposed to concentrate 14N17O. As the second example, a distillation column with an intermediate reboiler in the methane process to concentrate 13CH4 is studied. In spite of the large number of plates and high reflux ratio, the two examples are successfully simulated.

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