Siemenseljárás

Siemenseljárás, also known as Siemens process, is a method for the industrial production of sulfuric acid. It was developed by the German industrialist and inventor Werner von Siemens in the 1850s. The process involves the oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3) using a catalyst, typically vanadium(V) oxide (V2O5). The resulting sulfur trioxide is then absorbed in concentrated sulfuric acid to produce oleum, which can be further diluted to produce sulfuric acid.

The Siemens process is significant in the chemical industry due to its efficiency and ability to produce high-purity sulfuric acid. It is widely used in the production of fertilizers, detergents, and other chemicals. The process is also environmentally friendly, as it produces less sulfur dioxide emissions compared to other methods of sulfuric acid production.

The Siemens process has undergone several improvements over the years, including the use of different catalysts and the development of more efficient absorption systems. Today, the Siemens process is one of the most commonly used methods for the industrial production of sulfuric acid.