## On multiphase negative flash for ideal solutions

Publication: Research - peer-review › Journal article – Annual report year: 2012

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**On multiphase negative flash for ideal solutions.** / Yan, Wei; Stenby, Erling Halfdan.

Publication: Research - peer-review › Journal article – Annual report year: 2012

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*Fluid Phase Equilibria*, vol 322-323, pp. 41-47., 10.1016/j.fluid.2012.03.004

### APA

*Fluid Phase Equilibria*,

*322-323*, 41-47. 10.1016/j.fluid.2012.03.004

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*Fluid Phase Equilibria*. 2012, 322-323. 41-47. Available: 10.1016/j.fluid.2012.03.004

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TY - JOUR

T1 - On multiphase negative flash for ideal solutions

AU - Yan,Wei

AU - Stenby,Erling Halfdan

PY - 2012

Y1 - 2012

N2 - There is a recent interest to solve multiphase negative flash problems where the phase amounts can be negative for normal positive feed composition. Solving such a negative flash problem using successive substitution needs an inner loop for phase distribution calculation at constant fugacity coefficients. It is shown that this inner loop, named here as multiphase negative flash for ideal solutions, can be solved either by Michelsen's algorithm for multiphase normal flash, or by its variation which uses F−1 phase amounts as independent variables. In either case, the resulting algorithm is actually simpler than the corresponding normal flash algorithm. Unlike normal flash, multiphase negative flash for ideal solutions can diverge if the feasible domain for phase amounts is not closed. This can be judged readily during the iteration process. The algorithm can also be extended to the partial negative flash situation where several phase amounts must be non-negative and at least one phase amount can be negative.

AB - There is a recent interest to solve multiphase negative flash problems where the phase amounts can be negative for normal positive feed composition. Solving such a negative flash problem using successive substitution needs an inner loop for phase distribution calculation at constant fugacity coefficients. It is shown that this inner loop, named here as multiphase negative flash for ideal solutions, can be solved either by Michelsen's algorithm for multiphase normal flash, or by its variation which uses F−1 phase amounts as independent variables. In either case, the resulting algorithm is actually simpler than the corresponding normal flash algorithm. Unlike normal flash, multiphase negative flash for ideal solutions can diverge if the feasible domain for phase amounts is not closed. This can be judged readily during the iteration process. The algorithm can also be extended to the partial negative flash situation where several phase amounts must be non-negative and at least one phase amount can be negative.

KW - Negative flash

KW - Multiphase

KW - Algorithm

U2 - 10.1016/j.fluid.2012.03.004

DO - 10.1016/j.fluid.2012.03.004

M3 - Journal article

VL - 322-323

SP - 41

EP - 47

JO - Fluid Phase Equilibria

T2 - Fluid Phase Equilibria

JF - Fluid Phase Equilibria

SN - 0378-3812

ER -