The Job: Remove Heat as Fast as the Reaction Makes It
In an exothermic reaction, heat is generated where and when the chemistry happens — often in a sharp peak. The cooling system has to pull that heat out through the reactor jacket at least as fast, or the temperature climbs, the reaction accelerates, and you lose control of both quality and safety. This is why reactor cooling is sized around the peak heat-release rate.
What Chilled Reactor Cooling Controls
- Reaction rate and selectivity — holding temperature keeps the reaction on the intended path.
- Runaway prevention — adequate cooling capacity is a safety barrier.
- Crystallization & precipitation — controlled cooling curves set crystal size and yield.
- Condensing & reflux — cold fluid recovers solvent vapors.
Low-temperature work needs the right fluid. Below the freezing point of plain water you move to glycol mixtures or other secondary fluids. The fluid choice changes the chiller’s required capacity because its specific heat and viscosity differ — our sizing tool accounts for this.
Setpoint, Ramp, and Glycol
| Need | Implication for the chiller |
|---|---|
| Sub-zero setpoints | Glycol or secondary fluid; capacity derates at low temp |
| Controlled cooling ramps | Reactor temperature controller paired with chiller |
| Peak exotherm | Size for the spike, not the average load |
| Tight setpoint hold | Stable control loop for product consistency |
Sizing the Right Way
Work from the reaction’s peak heat-release rate and the lowest jacket temperature you need, in the fluid you will actually use. Add margin so the chiller can both reach setpoint and hold it during the exotherm. If you are unsure of the peak load, that is exactly the conversation to have with us before buying.
FAQ
Why size for peak instead of average heat load?
Exothermic reactions release heat in a spike. If the chiller can only handle the average, the batch overheats during the peak — risking off-spec product or a runaway. Size for the maximum heat-release rate.
When do I need glycol instead of water?
Any time your jacket setpoint is near or below water’s freezing point. Glycol or another secondary fluid lets you go colder, but it changes the required capacity, so the chiller has to be sized for that fluid.
Can one chiller both heat and cool the reactor?
For processes that need to ramp up and down, a temperature-control unit (heat + cool) is often the right tool. Tell us your full temperature range and we will point you to the right configuration.
See the full Chemicals page for system options.
Not Sure What You Need?
Tell us what you are cooling and we will figure out the right chiller for you. No jargon, no catalog. Just a straight answer.