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Additional info for Bench Scale Calorimetry in Chemical Reaction Kinetics: An Alternative Approach to Liquid Phase Reaction Kinetics
Even better would be to draw an exponentially curved line because the chemical conversion and, hence, the consistency usually change in an exponential way. This procedure is based on the assumption that the consistency of a reaction mixture changes synchronously and monotonously with the progress of the chemical conversion. Normally this is the case; but it is not necessarily so. For example, the heat-transfer coefficient decreases during the beginning of polymerization because of growing viscosity, but then it can change as a result of gas being stirred into the mixture (producing bubbles), which causes the effective viscosity to start decreasing; In addition, simultaneously occurring fluctuations in pressure can induce an alternating gas hold-up (change in magnitude of bubbles) causing a fluctuation in the heat-transfer coefficient.
Therefore, this type of construction is very appropriate for kinetic investigations. 14 2 Bench Scale Calorimeter Fig. g. phase inversion, precipitation) in a simple way, but knowledge of these special events often constitutes important information for chemists. Suitable devices, such as fiberscope endoscope, may allow one to view the reaction chamber. • Therefore, in the case of a non-compact calorimeter (Fig. 11), only a part of the intermediate thermostat encloses the measuring kettle in the form of a hollow jacket.
To hinder heat transfer into the surroundings of the measuring kettle, the temperature of the surroundings (intermediate thermostat) is adjusted to the changing temperature of the reaction mixture at any moment (Fig. 28). To be precise, this way of proceeding however, cannot attain an exact, thermal insulation of the reaction mixture because of the following facts: • The reaction mixture is separated from the filling of the intermediate thermostat by a wall of finite heat capacity • The heat-transfer coefficients from the reaction mixture into the inside surface of the wall and from the thermostat fluid into the outside surface of the wall of the measuring kettle are different • The heat flows due to the change in temperature simultaneously from the reaction mixture and the filling of the intermediate thermostat into the wall are therefore different • The mean temperature of the wall changes is temporarilly delayed compared with the changing temperature of the measuring kettle and the intermediate thermostat 36 2 Bench Scale Calorimeter Fig.