All Vapourtec cooled tube reactors contain a coil housed inside an insulated glass manifold. Temperature can be easily controlled by cooled air around the reactor. Vapourtec cooled tube reactors, therefore, do not need to be wound tightly round any sort of former to achieve thermal conductivity, so as a result have little or no physical stress and are also kept at a uniform temperature with no hotspots. This results in more precise control of reaction temperature and long reactor life.
All reactors can be switched in seconds with no tools.
Cooled tube reactor features
- PFA reactor tubing – resistant to strong acids
- Ambient down to -70°C
- Precooled reagent feeds
- Cooled mixing
- Cooled post reaction quenching
- Standard available sizes 2, 5 and 10ml
- Can accept DualCore™ reactor coils
- No icing up
- No external recirculating chiller required
How does the cooled tube reactor work ?
The standard Vapourtec system controls temperature by blowing air around the reactor within the reactor manifold. Hot air is used to raise the reactor temperature, ambient air is used to cool it.
With the new cooled tube reactor module, a dry ice heat exchanger is used to generate chilled nitrogen which is used to cool the cooled tube reactor down to the low temperatures required. No external recirculating chiller is required, and the reactor temperature set point is completely programmable, under control of either the simple front panel controls or the Flow Commander™ control software.
(New users are often strangely sceptical of the forced convection temperature control used by Vapourtec – until they have used it. It is clean, reliable, and provides extremely accurate temperature control). Because the reactor tube is surrounded on all sides by the temperature controlled gas, conductivity is actually better than the line contact achieved by winding a reactor tube around a metal mandrel. And the new cooled tube reactor module is no exception.
“Pre-cooling” and Quenching
Often cooling is required to slow down what would otherwise be a very rapid reaction. But there is no point in cooling a reactor if the reagents have already been mixed (and started reacting) upstream of the cooled region, because the reaction will already have been partially completed by the time it enters the cooled area. Furthermore, rapid exothermic reactions can dissipate a significant amount of heat in the actual mixer, which needs to be removed.
For this reason, Vapourtec have included the mixer that precedes the reactor within the cooled housing, along with the actual reactor, so the reagents are already in the cooled zone when they first meet. Not only that, but lengths of “pre-cooling tube” before the mixer ensure that the reagents are already at target temperature before they are brought together.
There is also provision for a second mixer after the reactor, enabling inline quenching to occur before the reaction products leave the cooled zone.
What else will I need to use this new cooled tube reactor ?
- You’ll need access to dry ice, and a supply of dry nitrogen.
- Your Vapourtec system may need upgrading to be compatible with the new module.
- No additional recirculating chiller, water supply or other cooling equipment is required.