Sulfur Removal
Protect you profit with our Smarter Sulfur Solutions
Sulfurous emissions standards are tightening worldwide, forcing industrial, chemical, refining, and metallurgical operations to compromise profitability to meet legal requirements. Sometimes a crystal-ball approach is needed when dealing with sulfurous emissions. Planning requires forward-thinking that takes both compliance and profitability into consideration.
With our Smarter Sulfur Solutions program, we provide you with the know-how, technology, and services needed to keep your operation running smoothly and compliantly. Each solution is optimized for a cost-effective lifecycle to protect your profit.
Smarter Sulfur Solutions solve your challenges
Flue Gas Desulfurization (FGD)
- SNOX™ technology removes SO2, NOx, particulates and mercury from flue gases without limestone consumption and without generating waste materials.
Sulfur Recovery (SRU)
- WSA technology recovers sulfur from waste streams in the form of concentrated, commercial grade sulfuric acid in a highly energy efficient way.
- TopClaus® technology combines the well-known Claus technology with WSA to recover sulfur from H2S gases in the form of elemental sulfur in the most efficient way, both with respect to CAPEX and OPEX. TopClaus® is applicable for green-field projects and revamps.
Upgrading of fuel gasses
- Our SweetPlus™ technology removes sulfur compounds and other troublesome compounds from fuel gases, making them easier to utilize as fuel or feedstock for chemical production.
Regeneration of spent acid
- With SmartSAR™ you get a highly economical and well-proven spent acid regeneration technology. This compact solution produces no waste and is highly energy efficient.
Topsoe offers a full range of solutions for dealing with sulfur emissions. When you partner with us, you gain access to a comprehensive range of technical services and innovative solutions that are designed to comply with increasingly stringent emissions standards. We also deliver licensing, basic engineering, and connected analytics services – and we offer the industry’s most extensive and advanced range of catalysts.
What we deliver
Related Downloads

SNOX™ technology solves SO2, NOx and dust challenge for ENI
“The plant achieved an average reliability factor of 99% over ten years of operation”
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WSA plant helps Sokolovská Uhelná meet emission standards
“Our WSA unit has been in operation for over 25 years and has exceeded our expectations for reliability, emission levels and sulfuric acid, which is a very good product to sell!”
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WSA - turn sulfurous emissions into commercial opportunities
With our well-proven WSA (Wet gas Sulfuric Acid) technology, you can turn your sulfurous gases into commercial-grade sulfuric acid.
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TopClaus® - minimize your sulfur recovery costs with a two-in-one solution
With our innovative TopClaus® solution, you get the best of two proven and well-known technologies: Claus and WSA.
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SweetPlus™ - monetize sour fuel gasses through sweetening
Turn waste into profit with SweetPlus™ technology, a process that lets you monetize otherwise hard-to-utilize sour fuel gas by converting it into pure fuel.
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SmartSAR™ - regenerate spent acid with maximum energy recovery
SmartSAR™ is a cost-effective, and well-proven spent sulfuric acid regeneration technology that has been successfully applied to more than 20 alkylation units worldwide and a handful of other plants generating spent acid.
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SNOX™ - reduce your costs for flue gas emission compliance
Low cost and effective flue gas emission control used to be a contradiction, but with our reliable and efficient SNOX™ technology, you can significantly reduce the cost of staying compliant without generating any waste.
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SNOX™ for carbon black - reduce your costs for air quality control
With our SNOX™ technology, carbon black producers can significantly reduce the cost of staying compliant without generating waste. It even goes one step further by eliminating any related dust nuisance, placing stack emissions well below allowable levels.
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Air quality with SNOX™ in carbon black plants
Carbon black manufactures worldwide are striving to meet public and governmental calls for more climate-friendly and sustainable production. Therefore, Topsoe introduces SNOX™ – a solution that efficiently removes sulfur oxides (SOx), nitrogen oxides (NOx) and particulates (PM) without consuming any water or absorbents.
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