pro2再沸器？ chemdist algorithm this method was designed to solve highly non-ideal distillation columns. it uses a modified naphtali-sandholm algorithm with a matrix solver developed by simsci. liquid activity coefficients and vapor phase fugacities are used directly rather than being converted to equilibrium k-values. mole fractions undergo a non-linear mapping which improves convergence. this is generally the best algorithm for three-phase distillation simulations or for two-phase simulations when the inside-out or enhanced i/o algorithm has difficulty converging. if you designate a vlle thermodynamic system for part of the column and a vle system for the rest, pro/ii checks the vle trays for possible vlle behavior. if vlle behavior is detected, the column may be resolved using vlle system for these trays. see column thermodynamic systems for more information. advantages of chemdist: (1) two liquid phases may be considered (2) solves highly non-ideal distillation columns disadvantages of chemdist: (1) side columns are not supported (2) pumparounds are not available (3) certain column specifications and variables are not permitted (4) only liquid activity thermodynamic systems or advanced equation-of-state methods may be used. 查看更多
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