Stirring

Magnetic stirring

Fluids in pressurized reactors are always stirred in a magnetically coupled manner, using two different technologies. Small reactors (≤300 ml) are stirred using an electric magnetic stirrer. Magnets rotate under the reactor at an adjustable rotational speed and drive a magnetic stirring rod in the reactor. This stirring fish ultimately ensures the mixing of the solution in the reactor. For stirring large-volume reactors (≥ 300 ml), the force is transmitted to the inside via a magnetic stirrer lock. This magnetic coupling is driven externally by a motor. Inside, a stirrer with different stirring geometries is connected. A bottom bearing guides the stirrer, stabilizes it and thus extends the service life of the magnetic coupling.The penetration of volatile, corrosive media into the coupling can be minimized by targeted condensation on the inner shaft. Corrosion is avoided. The optional cooling sleeve is required for this purpose.

In both cases, the stirring speed is controlled digitally, software-controlled in the BRHS or BRC. The starting and braking behavior can be adjusted. A break in the magnetic coupling, as can occur, for example, due to blocking of the stirring rod or stirrer in the reactor, is detected and the stirring speed is automatically ramped up again to ensure the desired mixing of the solution.