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Halowerk Fixed-K Rachford-Rice Flash Split
x402
Halowerk Fixed-K Rachford-Rice Flash Split is a paid API for AI agents from detect.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-04).
Computes a fixed-K vapor-liquid equilibrium phase split using the Rachford-Rice equation with explicit phase-composition bounds for a mixture.
Price / call$0.003
Success—
StatusUnknown
How this service works
Compute a fixed-K mathematical flash split with explicit phase-composition bounds.
Output
Returns the equilibrium vapor fraction (beta), along with the computed mole fractions for each component in the liquid phase (x_i) and vapor phase (y_i), subject to explicit phase-composition bounds. Oversized inputs exceeding 16000 bytes or outputs exceeding 20000 bytes return an unknown result without charge.
Example use cases
Hydrocarbon separator flash calculation
“I have a 4-component hydrocarbon mixture with feed compositions z = [0.25, 0.35, 0.25, 0.15] and equilibrium K-values k = [5.2, 1.8, 0.4, 0.05] — can you run the fixed-K Rachford-Rice flash split and give me the vapor fraction plus liquid and vapor mole fractions?”
Natural gas phase equilibrium check
“For a natural gas mixture with 5 components, feed mole fractions z = [0.6, 0.15, 0.1, 0.1, 0.05] and K-values k = [12.0, 4.5, 1.2, 0.3, 0.02], solve the Rachford-Rice equation and return the equilibrium phase split.”
Refinery process simulation step
“I need the vapor-liquid phase split for a 6-component refinery stream: feed compositions z = [0.1, 0.2, 0.25, 0.2, 0.15, 0.1] and fixed K-values k = [20.0, 7.0, 2.5, 0.6, 0.1, 0.01] — please compute it using the Rachford-Rice method with bounded phase compositions.”
Technical details
Endpoint
POSThttps://detect.halowerk.com/v1/F-TD2000-ENGINEERING-B001/fixed-k-mixture-rachford-rice-equilibrium-phase-split?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have pre-computed or assumed K-values for a multicomponent mixture (up to 24 components) and need to solve the Rachford-Rice flash equation to determine phase split fractions and compositions. This is ideal for process simulation steps, separator calculations, or sensitivity studies where K-values are fixed externally (e.g., from a correlation or prior thermodynamic model) and only the phase-split arithmetic needs to be performed. It is not suited for full equation-of-state flash where K-values must be iterated simultaneously.
Side effects
- Feed composition z values do not sum to 1.0 — invalid input
- K-values outside allowed range (0.0001 to 10000) — schema validation error
- Component count below 2 or above 24 — rejected by schema
- Input UTF-8 payload exceeds 16000 bytes — returns unknown without charge
- Computed result exceeds 20000 bytes — returns unknown without charge
- Degenerate mixture (all K-values ≈ 1) where Rachford-Rice has no unique solution
- Trivial solution (fully liquid or fully vapor) returned when feed is outside two-phase region
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| artifact | object | Bounded model; oversized UTF-8 input (16000 bytes) or computed result (20000 bytes) returns unknown without truncation or charge. |
Tags
x402
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