The agitated reaction vessel is the standard apparatus in the chemical industry for mixing processes and for chemical reactions in the liquid phase. The vessel is operated in batch mode with a temperature up to approx. 150° C. Depending on the requests of the process the agitated vessel consists of unalloyed or alloyed steel or is enameled, plated or rubberized. Because of their universal application in the industry the agitated vessels and a set of special fittings and accessories are standardized.

The substantial sections of a stirred reaction vessel are the vessel with built-in and directly attached constructions as well as the stirrer arm with the stirrer. Additionally measuring instruments are inserted, like RTDs and pressure transmitters.

The vessel is a cylindrical vessel with curved soil and a curved lid, which is welded or connected with a flange. In the cover are several openings - nozzles -, which are provided with flanges usually. The centric stirrer flange carries the gear stool with the stirrer. The other nozzles are distributed on the lid.

The manhole is an entrance hole into the vessel for assembling, repair and for cleaning. The manhole is round or oval. It must have a certain minimum size, which permits entering of a person. It serves also for filling in solids. In order to open or to close it quickly, it has a lift-up lid with U-pins. Additionally, it can have an inspection glass.

Further flange pipes in the lid serve for the supply of the reaction liquids, to let in and attach baffles and protective pipes for temperature sensors. They may be equipped with an inspection glass for checking.

The long baffles sticking into the vessel from the lid lead in conjunction with the stirrer to an intensive blending of the vessel content. They prevent that the entire tank capacity rotates with the stirrer. Usually, two to four current disturbers are installed.

The discharge nozzle with the outlet valve is at the bottom of the vessel. The heating fluid or coolant flows between outer casing and the vessel wall and ensures the optimal temperature for the process.

If heating with steam, the steam is fed from above and the condensate drains off through a steam trap.

The agitated reaction vessel lies either on a pedestal or rests upon brackets or a carrying ring. The large stirred reaction vessels rest upon a carrying ring on the floor from where it is operated.