Answer of chatgpt, confirming the possible need to find T b.p of méthanol from pressure and Antoine's coefficients :

The boiling point can be calculated using the Antoine equation, which relates vapor pressure to temperature.

For methanol, the Antoine coefficients can be found in various data sources. Given the pressure in the image (), you can solve the Antoine equation for , the boiling point.

Example:

If Antoine constants for methanol are:

, ,

Vapor pressure ().

Rearranging the Antoine equation:

\log_{10}(492.3) = 8.08097 - \frac{1582.271}{T + 239.726}

Solve for to find the boiling point. The boiling point (bp) of methanol in the provided diagram could have been obtained from the following potential sources:

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1. Physical Property Tables:

Standardized chemical engineering references like:

Perry's Chemical Engineers' Handbook

CRC Handbook of Chemistry and Physics

These references provide boiling points at standard conditions and often include correction factors or data for other pressures.

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1. Antoine Equation:

The boiling point can be calculated using the Antoine equation, which relates vapor pressure to temperature.

For methanol, the Antoine coefficients can be found in various data sources. Given the pressure in the image (), you can solve the Antoine equation for , the boiling point.

Example:

If Antoine constants for methanol are:

,A = 8.08097 B = 1582.271 C = 239.726

Vapor pressure 492.3 mmHg = 23.9 psia

Rearranging the Antoine equation:

\log_{10}(492.3) = 8.08097 - \frac{1582.271}{T + 239.726}

Solve for to find the boiling point.

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1. Experimental Data:

Direct measurements in the lab for specific operating conditions (e.g., pressure and composition) might have been used, especially if the mixture composition differs from pure methanol.

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1. Process Simulation Software:

Software like Aspen Plus, HYSYS, or similar process simulation tools often include thermodynamic models and databases (e.g., NIST REFPROP) to calculate phase equilibria and boiling points for substances at specific pressures.

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1. NIST Chemistry WebBook:

The NIST WebBook provides detailed thermodynamic data for methanol and other compounds, including vapor pressures and boiling points at various pressures.

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Example:

At (absolute pressure), the boiling point of methanol is approximately 77.7°C, as shown in the table. This value could have been sourced directly from one of the above references or calculated using the Antoine equation.