Decarbonization›CO₂ Phase Envelope
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CO₂ Phase Envelope

Decarbonization · Span-Wagner (1996) · Operating point classification

CO₂ Pressure-Temperature Phase Envelope
Generates the saturation and sublimation curves for pure CO₂ from the Span-Wagner (1996) reference equation. Optionally classifies an operating point and reports margin to the nearest phase boundary.

Plot Range

°C
°C
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Operating Point (optional)

°C
bara

Leave blank to skip operating-point classification.

📚 Learn the Theory

Span-Wagner CO₂ phase envelope, dense-phase region, sublimation curve, and operating-point classification for CCUS transport.

Read Engineering Guide →

Engineering Basis

  • Saturation curve: Wagner-form vapour pressure equation from Span & Wagner (1996), JPCRD 25, 1509.
  • Sublimation curve: Span-Wagner solid-vapour pressure equation (T < triple point, 216.59 K).
  • Saturated densities: Span-Wagner auxiliary equations for liquid and vapour ρ_sat.
  • Critical point: 304.128 K (30.98 °C), 73.77 bara, 467.6 kg/m³.
  • Triple point: 216.59 K (-56.56 °C), 5.18 bara — solid CO₂ ("dry ice") boundary.
  • Standards: ISO 27913 / DNV-RP-J202 — for transport, stay in single-phase region (dense liquid or supercritical).

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