Phase Envelope

Description

Generates a phase envelope (P-T diagram boundaries) for a natural gas mixture using Peng-Robinson EoS. Returns:

  • Bubble curve (T, P arrays): boundary where liquid begins to vaporize
  • Dew curve (T, P arrays): boundary where vapor begins to condense
  • Special points: cricondenbar (max P), cricondentherm (max T), critical point

The array outputs (bubble_T, bubble_P, etc.) can be used directly for charting in Excel.

Spreadsheet Preview

21 rows x 6 columns

Required Functions

PO.EoS.Component.Props

Returns component properties [Tc, Pc, omega, Mw] as a row array from the database. Spills horizontally into 4 cells.

PO.EoS.Envelope.PR

Phase envelope using Peng-Robinson EoS. Output: 'bubble_T', 'bubble_P', 'dew_T', 'dew_P' (arrays), or 'cricondenbar_P/T', 'cricondentherm_P/T', 'critical_P/T' (scalars).

How to use this blueprint
  1. In Excel, go to the Petroleum Office ribbon tab and click Blueprint Manager
  2. Search for Phase Envelope
  3. Click on the blueprint to preview the spreadsheet template
  4. Click Insert to place it into your worksheet. Modify the input values to match your data.

Related Theory

C7+ Characterization

Methods for estimating critical properties, splitting heavy fractions, and lumping components for equation of state modeling

Phase Envelope

Theory and construction of phase envelopes showing bubble point and dew point curves, cricondentherm, and cricondenbar

Peng-Robinson Equation of State

Theory and equations for the Peng-Robinson cubic equation of state including mixing rules, alpha functions, and volume translation

Related Blueprints

Component Database

Browse all available components and their thermodynamic properties.

PT Flash Calculation

Performs rigorous PT flash calculation for a ternary mixture (ethane, propane, n-pentane) using the property-array workflow:

Separator Test

Demonstrates array composability by chaining Flash calculations in a two-stage separator:

Binary Interaction Parameters

Estimates binary interaction parameters using available correlations:

Fluid Model Setup

Build a fluid property table combining database components, SCN (Single Carbon Number) pseudo-components, and mixture molecular weight. This is the foundational step for all EoS calculations.

Bubble & Dew Point

Calculates bubble point and dew point (pressure and temperature) for a ternary hydrocarbon mixture using Peng-Robinson EoS.

Tags:
eosphase-envelopecricondenbarcricondenthermcritical-point

Need a custom calculation? Request a Blueprint

An unhandled error has occurred. Reload X