On-line Calorimetry for the Determination of the Rate of Heat Production by Reaction within a Stirred Tank Reactor

Abstract

Besides the state variables usually available for measurement, such as temperature, pressure etc., the rate of heat production is a meaningful and fully accessible quantity to be measured for the model‐supported determination of the state of a chemical process. In the present study, the author describes the on‐line determination of the heat production rate within a stirred tank reactor by means of an appropriately designed calorimeter sensor and the results yielded by this measuring system for homogenous and heterogeneous reaction mixtures.

Bench Scale Calorimetry in Chemical Reaction Kinetics

“…In contrary to the totally irreversible two-stage, consecutive reaction (4.65) it can be assumed a priori that the following expression holds: 31 This means that the slope of the ending straight line κ 2 is the sum of the rate coefficients k 2 and k 3 .…”

“…31 When the equilibrium achieved between B and C is quicker than the consumption rate of A, the temporal course of the formation in B and C corresponds more or less to the course of a coupled parallel reaction, the plot of ln{q} over time yields in the case (k 2 + k 3 ) ) k 1 over the total reaction time approximately a straight line with slope κ ¼ k 1 : in that case, (4.72) changes to…”

“…31 Scheme of isoperibolic measurement equipment. Characteristic course of temperature of an exothermic reaction13 The plot of ln T 2 versus time gives a curve which turns into a straight line.…”

“…31) and(5.33) in the explicit form T 2 ¼ f(t) respectively of the combination of (5.31) and (5.33) with(2.22) in the explicit form T 2F (t), i.e. the signals of the temperature sensor, do not exist.…”

The Law of Gas–Liquid Shear Mixing under the Synergistic Effect of Jet Stirring

“…The traditional method of using direct gas supply is not conducive to the full mixing of gas and liquid phases, reducing the utilization rate of the gas and causing impurities that damage the chemical properties of the prepared products. Moreover, the production cost of the equipment is high, which is not conducive to maintenance and upkeep [25][26][27][28].…”