Total Pressure Formula:
From: | To: |
Definition: This calculator computes the total pressure of a binary vapour system using Raoult's Law for dew-bubble point calculations.
Purpose: It helps chemical engineers and researchers determine the equilibrium pressure of a two-component vapour system.
The calculator uses the formula:
Where:
Explanation: The formula calculates the total system pressure based on the composition of the vapour phase and the saturation pressures of the pure components.
Details: Accurate pressure calculations are essential for designing distillation columns, vapor-liquid equilibrium studies, and process simulations.
Tips: Enter the mole fractions (must sum to ≤ 1) and saturation pressures for both components. All pressure values must be > 0.
Q1: What is Raoult's Law?
A: Raoult's Law states that the partial pressure of a component in a mixture is equal to the product of its mole fraction in the liquid phase and its vapor pressure as a pure substance.
Q2: When is this calculation most accurate?
A: This calculation is most accurate for ideal mixtures where the components have similar molecular sizes and intermolecular forces.
Q3: What if my mole fractions don't sum to 1?
A: The calculator will still work, but the result assumes the remaining fraction is non-condensable gas or other components not accounted for.
Q4: How do I find saturation pressures?
A: Saturation pressures can be found in chemical engineering handbooks or calculated using Antoine equation for a given temperature.
Q5: Can this be used for non-ideal systems?
A: For non-ideal systems, activity coefficients should be included in the calculation (modified Raoult's Law).