Acid Gasses

Acid gases are any gaseous compounds that form an acidic solution when dissolved in water.

The following is a list of generalised groupings of acid gases, click on each to go to their section below:

  • Hydrogen Sulfide (H2S) also known as rotten egg gas (see odours and smells)
  • Hydrogen Halides (HCl, HF, HBr)
  • Sulfur Oxides (SO2 and SO3)
  • Nitrogen oxides (NOx)
  • Other acid gases

 

Hydrogen Halides

Hydrogen halides (HCl, HF, HBr) often result from the burning of materials containing halide groups (plastics, salts, minerals, PCB etc.).  HCl is highly soluble in water and forms hydrochloric acid.  Hydrogen bromide is less soluble but forms hydrobromic acid.  Hydrogen fluoride is only weakly soluble and forms only a weak acid.  Because of these varying solubilities, the size and type of gas scrubbing varies with each.

We have multiple plants scrubbing hydrogen halides from simple tank vents to complex multi-stage systems. Contact us so that we can determine what is right for your system.

 

Equipment Options

Chemical Scrubbers

Chemical Scrubbers

Activated Carbon

Activated Carbon

Biological Scrubbers

Biological Scrubbers

Sulfur Oxides (SOx)

 

Sulfur dioxide and sulfur trioxide often results from the burning in oxygen of materials containing sulfur compounds (coal, oil, metalurgical ores.).  Typically sulfur trioxide and sulfur dioxide co-exist in an exhaust stream with a ratio of around 20 to 25:1 SO2:SO3.  Both SO2and SO3 are highly soluble in water, making water based scrubbing desireable at low temperatures.

We have multiple plants scrubbing SOx in various applications – from coal fired power station exhausts to steel mills. Contact us so that we can determine what is right for your system.

Equipment Options

Vapor Recovery System (Activated Carbon)

Vapor Recovery System (Activated Carbon)

Acticated Carbon Canisters

Acticated Carbon Canisters

Nitrogen Oxides (NOx)

 

NOx is typically a general term for a mixture of nitric oxide (NO) and nitrogen dioxide (NO2).  Both are formed in burning processes where oxygen is present, especially at high temperatures.  NOx is one of the prime constituents of photochemical smog.

Nitric oxide is low in solubility, hence it must be oxidised to nitrogen dioxide to be effectively scrubbed in a water based chemical scrubber.  Hence a multiple stage approach is required to remove NOx with a chemical scrubber.

At higher temperatures (above 340°C), catalytic destruction of NOx is the preferred option.  Ammonia or urea is injected into the gas stream prior to the catalyst, and via a series of complex reactions, nitrogen (N2) and water are produced.

We have multiple plants in NOx removal.  As the pollutant mix can be very complex, please discuss options with our engineers.

Equipment Options

Destruction via Catalyst

Destruction via Catalyst

Multi-Stage Chemical Scrubbers

Multi-Stage Chemical Scrubbers

Other Acid gases

 

Acid gases are typically water soluble, hence the predominant removal technique is packed bed chemical scrubbers with a caustic solution.

We have multiple plants in virtually every possible acid gas.  Contact us today for assistance with your issue.

Equipment Options

Chemical Scrubbers

Chemical Scrubbers

Contact us

+61 (0)2 4272 5233

sales@tapc.com.au