Reaction Calorimetry - Syrris
- Category: ROOT
- Published: 30 April 2010
Reaction calorimetry is a non-intrusive, nondestructive, real time technique that yields valuable process data. It offers valuable kinetic data (rate, end point detection) and gives safety data for scale-up and hazard analysis. Therefore it is widely used by process and development chemists as well as dedicated process safety chemists/engineers. A reaction calorimeter accurately measures the power and enthalpy changes of chemical reactions.
Real time data with no extra effort
Historically, reaction calorimeters were too expensive, too difficult to operate or too slow to set up. The Atlas Calorimeter generates calorimetry data with the same effort required to run a regular experiment. The Atlas Calorimeter has been designed to be extremely accurate yet very easy to use
Heat Flow and Power Compensation Calorimetry
The Atlas Calorimeter has been designed so heat flow calorimetry (HFC) and power compensation calorimetry (PCC) are performed with the same equipment, allowing a choice of methods for the reaction.
Heat Flow Calorimetry (HFC) or Power Compensation Calorimetry (PCC)?
HFC is generally used for reactions where the heater may have an effect on the chemistry, since the dip in heater is not used during the reaction. HFC is also preferred when large exotherms are expected. PCC is used where quicker results are required, since no pre and post calibration is required. Data can be shown in real time with both methods using Atlas.
Power Compensation Calorimetry (PCC)
PCC provides a very direct method for measuring process power and enthalpy. The reactor runs isothermally with the jacket set at a constant temperature below the desired reaction temperature. The temperature offset is maintained by the addition of power. The energy input is adjusted continuously by the Atlas Software to maintain the reactor contents at the desired temperature. PCC determines the heat of reaction by monitoring the power supplied to a compensation heater placed in the reactor (above).
Heat Flow Calorimetry (HFC)
HFC determines the heat flow into or out of the system by measurement of the temperature difference between the vessel jacket and the reactor. The reactor temperature is controlled isothermally at all times by modulating the jacket temperature and the difference between the reactor temperature and the jacket temperature is monitored. Data is gathered by measuring the difference between reactor temperature (Tr) and jacket temperature (Tj). The result (Tr-Tj) is a measure of the heat flow between the reactor and the jacket, is directly proportional to the actual power and is automatically calibrated before and/or after the experiment.