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THIOPAQ®

Gas containing hydrogen sulphide (H₂S) can effectively be desulphurized by using THIOPAQ^® technology.

THIOPAQ® is a biogas scrubber or gas scrubber and applicable to

• Biogas (from anaerobic wastewater treatment, anaerobic digestion, landfill, etc)
• Vent air loaded with hydrogen sulphide
• Refinery gas
• Hydrogen sulphide containing gases in the oil and gas and petrochemical industry

The THIOPAQ^® installations range from very small standardised units to very large custom made design. The (bio)gas flows range from 10Nm3/hr to more than 50,000 Nm3/hr. The daily sulphur loads range from 10 kg to 50 tonnes.

With more than 120 THIOPAQ^® installations operating worldwide, this technology has proven its effectiveness.

Advantages of THIOPAQ®

• Highly reliable and robust (over 98% uptime)
• Deep H₂S removal sulphide (to less than 25 ppm)
• Treatment of largely fluctuating gas flows and sulphur loads
• Biogas is not diluted with air: strict physical separation between biogas and air
• Only small amounts required of caustic, water and nutrients
• No risk of plugging and fouling, therefore low maintenance
• Operating at ambient pressures and temperatures
• Production of sulphur: this is can be used as fertilizer and fungicide

Working principle

THIOPAQ^® combines physical-chemical adsorption of hydrogen sulphide in a mild alkaline solution with biological regeneration of the caustic solution using air.

The biogas containing hydrogen sulphide enters the absorber column and is washed by a scrubbing liquid with an alkaline nature that absorbs the hydrogen sulphide.

H₂S + OH^- → HS^- + H₂O

The biogas exits the top of the absorber virtually free of hydrogen sulphide. The liquid containing sulphide flows to the bioreactor, where bacteria oxidise it and convert it under oxygen-limiting conditions to sulphur and caustic.

HS^- + ½ O₂ → S⁰ + OH^-

THIOPAQ® cases