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  • 1 Università di Messina Dipartimento di Chimica Industriale e Ingegneria dei Materiali Salita Sperone 31 (Casella Postale 29) I-98166 Sant'Agata di Messina Italy Salita Sperone 31 (Casella Postale 29) I-98166 Sant'Agata di Messina Italy
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Abstract  

A simple method for the on-line calibration, in which both the heat transfer coefficient and the heat capacity of the reactor contents are determined, is described for laboratory scale heat transfer calorimeters. The calorimeter is operated in the isoperibolic mode for the calibration and a constant power is supplied to a resistor placed inside the reactor. The reactor heat balance differential equation is used to produce a set of linear simultaneous equations with each data acquisition cycle giving one equation. The heat transfer coefficient and the heat capacity are obtained from this set of equations by linear least squares. The application of the calibration procedure is illustrated by experiments in which the heat of reaction is determined on-line fora simulated reaction with first order kinetics and for the hydrolysis of acetic anhydride.