Technology Unit

: Absorber
: Espindesa Nitric Acid
Short Name: Absorber
Description: The Internals of the Absorber are a set of Sieve Trays with Integral Cooling Coils; the number of Trays depends on the Tail Gas NOx content permitted in the Exhaust Gas; where that could be designed below 200 ppm, a Catalyst for DeNOx Abatement may be advisable. The separated 30% Nitric Acid Stream is pumped to the appropriate Tray of the Absorber towards the Top of the Column, whereas the Process Gases cooled down to 50°C are sent to a lower Tray of the Absorber; by the time the Gases reach the Inlet of the Absorption Tower the Oxidation of NO to NO₂ has already been completed. The Acid leaving the Bottom of the Absorption Column is a reddish colour due to the presence of dissolved free NO₂. The Tail Gas leaves the Absorption Tower at 10 bar and 25º C.
Link: https://espindesa.es/uploads/technologies/1.-ficha%20HNO3%20DUAL.pdf