Technology Unit

: Falling Film HCl Absorption Column
: Thyssenkrupp ODC
Short Name: HCl Absorption
Description: If deployed in conjunction with MDI/TDI plants, the Process starts with Anhydrous Hydrogen Chloride Gas which is conditioned in the Absorption Unit. The dissociation of HCl Gas in Water or Weak HCl Solution is a strong exothermic Reaction. In general, Hydrochloric Acid in a concentration range between 28 to 37% is required. There are two different options: Isothermal or Adiabatic Absorption. In case of Isothermal HCl Absorption Process, either Demineralized Water or 12.5wt.% Hydrochloric Acid is used as an Absorbent in a Falling-Film Column to produce Hydrochloric Acid with a concentration of up to 37wt.%. It is continuously removed and sent to the Filtration Unit. Adiabatic absorption is usually applied for Weak HCl Gases and includes the deployment of Tray or Packed Columns. With an Adiabatic Absorption Process it is not possible to produce more highly concentrated Hydrochloric Acid.
Link: https://www.thyssenkrupp-uhde-chlorine-engineers.com/en/products/hydrochloric-acid-recycling/odc-technology