TB

This function looks up a chemical’s normal boiling temperature from curated thermophysical databases using its CAS number.

The normal boiling point is the saturation temperature at approximately one atmosphere pressure and is often used for separations, screening, and process design calculations.

Excel Usage

=TB(CASRN, method)

• CASRN (str, required): CAS Registry Number for the target chemical (-).
• method (str, optional, default: null): Optional data source method name; leave empty for automatic selection (-).

Returns (float): Normal boiling temperature in kelvin (K).

Example 1: Boiling point of water

Inputs:

CASRN
7732-18-5

Excel formula:

=TB("7732-18-5")

Expected output:

373.124

Example 2: Boiling point of ethanol

Inputs:

CASRN
64-17-5

Excel formula:

=TB("64-17-5")

Expected output:

351.57

Example 3: Boiling point of methane

Inputs:

CASRN
74-82-8

Excel formula:

=TB("74-82-8")

Expected output:

111.667

Example 4: Boiling point of benzene

Inputs:

CASRN
71-43-2

Excel formula:

=TB("71-43-2")

Expected output:

353.219

Python Code

Show Code

from thermo.chemical_package import Tb as thermo_tb

def tb(CASRN, method=None):
    """
    Retrieve the normal boiling temperature of a chemical by CAS number.

    See: https://thermo.readthedocs.io/thermo.chemical_package.html

    This example function is provided as-is without any representation of accuracy.

    Args:
        CASRN (str): CAS Registry Number for the target chemical (-).
        method (str, optional): Optional data source method name; leave empty for automatic selection (-). Default is None.

    Returns:
        float: Normal boiling temperature in kelvin (K).
    """
    try:
        value = thermo_tb(CASRN=CASRN, method=method)
        if value is None:
            return "Error: Boiling point data is not available for the provided CASRN"
        return value
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

CASRN *

CAS Registry Number for the target chemical (-).

method

Optional data source method name; leave empty for automatic selection (-).