Device with Reflux Condenser for Isothermal, Discontinuous Reaction Boiling Condition

4 Device with Reflux Condenser for Isothermal, Discontinuous Reaction (Boiling Condition) 

While boiling a component of the reaction mixture (as a rule, the solvent) the temperature does not change despite heat release from the reaction. As is well known, the temperature remains unchanged as a result of more or less boiling. Consequently, it is not possible to measure the nascent heat directly, i.e. by changes in the compensating power of the electric heater in the measuring kettle. 

However, under certain conditions, this measurement can be carried out indirectly by measuring the rate of heat release from the condensation of vapour in the condenser, which is recorded by the condenser/ intermediate thermostat (Fig. 2.36). The conditions for equality of the thermal reaction power and the rate of heat release by condensation are as follows  

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