Chemistry | H2SO4 | Optimizing Sulfuric acid production with H2SO4 Process Concentration Measurement

Anton Paar’s process sensors help to increase H2SO4 production efficiency and to protect plant equipment. A complete, high-performance process concentration measurement portfolio that covers the entire H2SO4 and oleum range from 0 % to 110 % is offered.

Sulfuric acid (H2SO4) production

Sulfuric acid can be produced from different raw materials. The main one is elemental sulfur, but also others, e.g. spent sulfuric acid, can be used. At present, the double contact double absorption (DCDA) process is state of the art when it comes to producing sulfuric acid and oleum.

First, the element sulfur is burned to produce sulfur dioxide (SO2). Then this resulting sulfur dioxide is cleaned, dried, and oxidized to sulfur trioxide (SO3) using oxygen in the presence of a catalyst. Finally, the SO3 is absorbed into a strong H2SO4 solution. By adding water, in addition to the dissolved SO3, the concentration is kept constant at an optimum and the H2SO4 amount is increased. For oleum production, the SO3 first passes an oleum tower which is also fed with 98 % H2SO4 to form oleum. The aim is to run the process with the highest efficiency regarding the conversion of SO2 into SO3 and SO3 into H2SO4.

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