A Simplified Calculation Method for Flash Distillation and Equilibrium Partial Condensation

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  • YAMADA Ikuho
    Nagoya Institute of Technology, Department of Industrial Chemistry
  • MORI Hideki
    Nagoya Institute of Technology, Department of Industrial Chemistry
  • PARK Young Hae
    Nagoya Institute of Technology, Department of Industrial Chemistry
  • YOSHIDA Makoto
    Nagoya Institute of Technology, Department of Industrial Chemistry
  • HIRAOKA Setsuro
    Nagoya Institute of Technology, Department of Industrial Chemistry

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Other Title
  • フラッシュ蒸留と平衡分縮に対する簡略化計算法

Description

A new simple method is proposed to solve the flash distillation and equilibrium partial condensation problems of multicomponent systems where the external heat duty of a heat exchanger is specified.<br>The schematic flow diagram of the unit is shown in Fig. 1, and the mass and enthalpy balance equations are given in Eqs. (1) to (3).<br>The algorithm of the method consists of only a correction loop of the liquid composition based on the normalized θ method4), as shown in Eqs. (10) and (11), and is characterized by having no constraint from ratios, β and β', of vapor and liquid rates to feed rate. However, in spite of the simplicity of the algorithm compared with others1)-3), the results (Tables 4, 5) of the numerical examples given in Table 1 prove that the method is valid not only for ideal system but also for non-ideal system.<br>It is also easily understood that the proposed method can be applied to the adiabatic flash distillation calculations by setting the heat duty Q in Eq. (3) equal to zero.

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