Examples
Examples
Try the starting example
- Feed mole fractions
- 0.5,0.5
- Supplied equilibrium K ratios
- 2,0.5
- Equilibrium vapour fraction
- 0.5
- Liquid mole fractions
- [0.333333333333,0.666666666667]
- Vapour mole fractions
- [0.666666666667,0.333333333333]
- Phase status
- Two phase
Try another scenario
- Feed mole fractions
- [0.6, 0.4]
- Supplied equilibrium K ratios
- [2, 0.5]
- Equilibrium vapour fraction
- 0.8
- Liquid mole fractions
- [0.333333333333,0.666666666667]
- Vapour mole fractions
- [0.666666666667,0.333333333333]
- Phase status
- Two phase
Calculation method
Calculation method
Equilibrium vapour fraction
Solve sum zi(Ki−1)/(1+beta(Ki−1))=0 by bisection; return single-phase limits when no two-phase root.
Liquid mole fractions
xi=zi/(1+beta(Ki−1)), normalized if hypothetical single-phase complement.
Vapour mole fractions
yi=Ki xi, normalized for single-phase complement.
Phase status
Two-phase, all-liquid or all-vapour under constant supplied K model.
Symbols and units
- a
- Feed mole fractions
- b
- Supplied equilibrium K ratios
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Isothermal ideal constant-K Rachford–Rice flash. User supplies thermodynamically appropriate equilibrium ratios; no equation of state or heat balance is solved. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Feed mole fractions: minimum 0, maximum 1. Supplied equilibrium K ratios: minimum 1e-12, maximum 1000000000000.0.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.