VLE Thermodynamic Consistency Checker

Audit binary Txy or Pxy vapor–liquid equilibrium data for Gibbs–Duhem consistency — Herington / Redlich–Kister area, Van Ness point, pure-component endpoint, and Kojima infinite-dilution tests — with units normalized and suspect points flagged before regression or flash calculations.
0 data points ready
Estimated minimum cost: $—

Examples

Binary pair

Identify the two species by name, SMILES, or CAS number. Pure-component vapor pressures come from the thermo property database unless Antoine constants are supplied.

ComponentIdentifierValueTc (K)Pc (Pa)ωAntoine AAntoine BAntoine C
1
2

VLE data

One row per measured point with a temperature column (t_k, t_c, or t_f), a pressure column (p_pa, p_kpa, p_mpa, p_bar, p_atm, p_mmhg, p_torr, or p_psia), and liquid mole fraction x1 of component 1, plus y1 when measured. Mole percent columns (x1_pct, y1_pct), complements (x2, y2), a dataset label for separate isotherms or isobars, and uncertainties (u_t_k, u_p_kpa, u_x1, u_y1, …) are optional. CSV or a JSON array of objects, up to 500 rows.

or drop a file here
0 / 500 rows

Tests and settings

Gibbs–Duhem tests on activity coefficients derived from the data. Results depend on the vapor model and vapor-pressure source, so each verdict is reported with its assumptions rather than as a universal pass or fail.

Tests
Criteria and classification▶