Cryogenic cooling Type TG-RD for reaction vessels from +100°C (+212°F) to -180°C (-292°F)

Cryogenic cooling for reaction vessels from +100°C (+212°F) to -180°C (-292°F)

To obtain rapid cooling speeds and very low temperatures, sometimes you have to switch from conventional mechanical cooling to cryogenic cooling. With this scenario in mind, KGW-ISOTHERM has developed a new KALTGAS system. In it, the reactor is cooled with cryogenic nitrogen gas, resulting in a high cooling speed.
KALTGAS is a tempering system that utilizes the very low temperature of liquid nitrogen as a cooling agent. The Jet vaporizes the liquid nitrogen in a cryogenic container, producing a steady cryogenic gas flow. This LN2 vaporizer (Jet) can be adjusted to minimize liquid nitrogen consumption and to change both the cooling rate and the volume of the gas flow. The cryogenic gas flow is then piped through a vacuum-insulated flexible metal line (N2 gas line) to a heat exchanger (heater). The heat exchanger is designed to heat the cold gas flow to the desired temperature. The final product, a clearly quantified gas flow exiting the heat exchanger at a clearly defined temperature, is ready for use as a cooling agent. The steady gas flow is directed through a cooling coil suspended in the reaction vessel, where it cools the medium contained in the vessel. The cooling coil can be connected to the KALTGAS system with a quick-lock mechanism, providing for quick and effortless assembly. This is a type of KALTGAS system that tempers reaction vessels directly. The KALTGAS system cools the medium in the reaction vessel at an extremely high speed because of the great differences in temperature between the cold gas and the medium to be tempered.

A KALTGAS system needs only a few minutes to produce a cold gas flow with a temperature of -180°C (-292°F). This extremely cold gas flow makes it possible to rapidly cool down the medium in the reaction vessel. With the standard safety control unit (SC5), a temperature stability of better than ± 0.2°C can be achieved. A cascade control system can also be used. With it, you can control the temperature of both the gas and the medium in the reaction vessel. As the current temperature approaches the temperature set point, the difference in temperature is continuously reduced by the temperature controller. That means that a temperature stability of approx. ± 0.1°C can be achieved at steady state.

In addition to their high cooling speed and good control stability, another significant advantage of KALTGAS systems is their modular design. Both the cooling rate and the cooling speed can be changed simply by replacing individual modules such as the N2 gas line, the LN2 vaporizer (Jet) or the heater. The basic modules, including the LN2 container, the vacuum pump and the safety control unit, remain unchanged. Another advantage lies in the cooling agent itself. Since liquid nitrogen gas is inert, reaction vessels can be switched without the usual problems associated with the thermostat oil. Furthermore, cleaning the reaction vessel is limited to the vessel's reaction chamber and no longer entails cleaning the thermal jacket.
In a reaction vessel, 1.5 liters of methanol are cooled from +20°C (+68°F) to -95°C (-139°F) within approx. 50 minutes. During the cooling phase, about 5 to 6 liters of LN2 are consumed. To maintain the methanol at -95°C (-139°F), the reactor needs only about 1.2 liters of LN2 per hour.

Technical data for:

Model TG-RD
Jet = 500 Watt
Ln2 vaporizer = 500 watts Heater = 630 watts
Reactor = 2 liters volume vacuum insulated with viewing stips
Reactor lid = 3 x NS 29/32 on sides and middle, vacuum insulated
Fame = Aluminum / V2A
N2 gas line = V2A, length 1.5 meters, with vacuum pump
Standard safety control unit = Constancy +/-0,2°C
Siphon Lever = for LN2 container with KF NW 50
Order No.: TG-RD 63/50


LN2 container with 20 to 300 liter capacity Stirrer, stirring machine and dynamic stirrer seal

Further reactor and cooling system information available.
Technical data subject to change.