German term (edited): Reaktor

This is most likely a typo for "(chemical) reactor".

See, for example, https://www.processsensing.com/en-us/industries/monitoring-o...
("Pharmaceuticals and Specialty Chemicals are typically produced in batches by mixing several components in a reactor. These reactors vary in size from table-top glass jars to large stainless steel or glass lined vessels with a mixer (like a giant domestic food blender). The vessel will be subjected to a nitrogen blanket prior to and during batch production so oxygen levels must be monitored at all times for plant and operator safety.")