Hydrogen Fluoride Scrubber


  • Competitive packages including instrumentation and controls, skid mounting of equipment, acid storage tanks, metering pumps, and installation
  • Vertical and horizontal configuration
  • Efficiencies up to 99.9 %
  • Capacities of 50 to 30,000 CFM
  • Custom designed systems
  • Options to be retrofitted with current equipment
  • Media options
  • Faster commissioning time
  • In-house designed and manufactured control panels
  • Sized system process fans
  • Portable options and sizes available


  • Chemicals industry
  • Waste incineration installations
  • Pharmaceutical industry
  • Storage and transfer of chemicals
  • Surface treatment
  • Gas cleaning system


Hydrogen Fluoride (HF) is a colorless gas.  Hydrogen Fluoride in the liquid form is Hydrofluoric Acid. Hydrogen Fluoride emissions are present across a variety of industries including metal processing and finishing, agricultural, fertilizer, semiconductor, chemical production, and mining.   HF is widely used in stainless steel and alloy industries for pickling and descaling various metals.  HF is often used in the chemical etching process of aerospace components.

Exposure limit

  • The permissible exposure limit (PEL) for HF is 3 ppm (for an 8-hour time weighed average exposure)
  • The IDLH (immediately dangerous to life or health) limit for HF is 30 ppm. The odor detection threshold is about 1 ppm and is very noticeable at the PEL.


  • Modern dry scrubbers operate with very high efficiency, typically above 99 %, and all but the fugitive fluoride losses are returned into electrolytic cell.
  • The principle of purification of exhaust gases from electrolytic cells is adsorption of HF onto primary alumina in dry scrubber reactors, where gases from cells and flow of active (primary) alumina run into each other and react.
  • The scrubbers are filled with crushed limestone (CaCO3) which reacts with HF to produce inert calcium fluoride (CaF2): CaCO3 + 2HF E CaF2 + H2O + CO2
  • There are three primary scrubbers operating in parallel plus a secondary scrubber following in series that is intended to further reduce the HF emissions to the environment.


  • Remove less concentrated pollutant in exhaust stream
  • Versatile
  • Capable of abating very acidic streams
  • Spent media can be a source of revenue
  • Smaller space requirements
  • Can be retrofitted into current equipment
  • Lower cost of purchase
  • Able to neutralize highly corrosive gases
  • Several customizable options, based on specific output and applications, often allowing for a reduction in cost.
  • Eliminates as much or more than 99% of dangerous gases
  • Doesn’t produce any wet sludge
  • We can include a fabric filter to effectively control the particulates