When cooling Silicone oil in Constant Reactor Temperature control mode from 120 °C to 40 °C, all reactors achieved a maximum cooling rate of -9.0 °C/min with the oil temperature at 30 °C. This is due to the cooling capacity available from the circulator (graph 3). This was repeated with Methanol between 50 °C down to 10 °C. Though cooling was achieved at this lower temperature, the cooling rate was less stable at -4 °C/min or above.
When cooling in Constant Reactor Temperature mode, the reactor zones achieved a lower temperature in a shorter time with active cooling. With active cooling, circulator oil is continuously flowing through the PolyBLOCK’s oil cell. The reactor’s material and volume of solvent effect constant cooling rates, as shown in the graph below.
In Graph 4, it is observed that Reactors 4 and 5, a glass and a high-pressure reactor, take the same time to cool, possibly due to their similar vessel sizes. All reactors required approximately 30 minutes to cool 80 °C at varying rates. Graph 5 shows the benefits of cooling at -2 °C/min with active cooling, where all reactors behave uniformly.