* feat: add Chlorine (Cl2) fundamental equation of state
Implements the EOS from Thol, Herrig, Span, Lemmon (AIChE J. 67, e17326,
2021, DOI: 10.1002/aic.17326) for chlorine (CAS 7782-50-5).
- 10-term polynomial/exponential residual + 5-term Gaussian bell-shaped
- Ideal gas: diatomic (2.5) + 3 Planck-Einstein terms (800/3000/8200 K)
- NBP reference state (h=0, s=0 at saturated liquid, 101325 Pa)
- Saturation ancillaries: pS, rhoL, rhoV from REFPROP coefficients
- Valid range: 172.17 K to 525 K, up to 20 MPa
- Adds BibTeX entry Thol-AICHE-2021
Closes#2714
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* feat: add superancillary equations to Chlorine EOS
Builds Chebyshev superancillary for Cl2 covering the full saturation
curve from Ttriple (172.17 K) to near-critical (416.865 K, 61
intervals). Errors away from the critical region are at machine-
precision level (~1e-13 %).
The fastchebpure builder was also patched to prune near-critical
intervals where the pressure Chebyshev expansion becomes non-monotone
due to ill-conditioned VLE convergence at very small Theta; 3 such
intervals were removed for Chlorine (Theta ~ 2.3e-7).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* Bump fastchebpure release to 2026.04.16 to fix docs CI failures
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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