Location: Tunesia
Capacity: 100.000 Nm³/h
Year of Commissioning: 2008
Scope of Supply: EPC
OXYSULF sulfur and sulfuric acid technologies
Integrated solutions across the entire sulfur value chain
The OXYSULF portfolio is KVT’s advanced wet sulfuric acid technology designed to convert sulfur-containing process streams into high-value sulfuric acid while achieving maximum sulfur recovery, low emissions, and high energy efficiency. Based on proven thermal and catalytic oxidation processes, OXYSULF enables the direct recovery of sulfur from a wide range of sulfur-bearing gases, transforming environmental challenges into valuable products. The technology combines sulfur oxidation, sulfuric acid condensation, heat recovery, and emission control in a highly integrated process that delivers reliable operation and superior environmental performance.
Beyond wet sulfuric acid production, KVT provides engineering solutions across the entire sulfur value chain. Our expertise includes sulfur handling and storage, sulfur combustion, SO₂ generation, sulfuric acid and oleum production, absorption systems, spent acid regeneration, sulfur recovery, tail gas treatment, and advanced emission control technologies. This comprehensive approach allows clients to optimize sulfur utilization, improve plant efficiency, and meet the most stringent environmental requirements with a single technology partner.
Technology in Detail
The OXYSULF technology is an innovative wet process to produce sulfuric acid from off-gas containing sulfur-bearing compounds. This technology pairs sustainability with guaranteed low emissions. OXYSULF technology offers total and reliable solutions for a wide range of industrial sectors.
-
Refineries and petrochemical industry
-
Coal based fertilizer and chemical industry
-
Natural gas processing
-
Viscose industry
-
Power industry
-
Cokes manufacturing
-
Metallurgical industry (Cu, Mo, Pb, …)
For each client and their application, a specific plant configuration is developed to achieve an optimal solution.
Plant configurations depend on feed composition and impurities.
-
Type of sulfur-compounds in the feed (H₂S, CS₂, COS, SO₂, R-SH, spent acid or sulfates, …)
-
Concentration of sulfur-compounds in feed (low/high)
-
Clean or dirty feeds
-
Liquid/gaseous feed
-
Emission requirements of local authorities
-
Additional sulfur burning for higher H₂SO₄ production
-
Additional products are required
OXYSULF plants are easily operated and highly automated to minimize operator working time and maximum availability.
OXYSULF plants have a compact design with modular parts which means easy installations and easy integration into existing industrial plants:
- Combustion and waste heat boiler unit
- Reactor: to achieve high overall conversion, special TARDIGRAD catalysts are used (a noble metal-based catalyst for wide temperature range, low pressure drop and high conversion rate).
- Heat recovery system: uses a heat transfer fluid to achieve the maximum efficiency. Due to the exclusive design the excess heat is recovered from the reactor and from the condensation column as the acid cooler to recover it efficiently in the process or externally.
- Condensation unit: the acid condensation column is based on a new KVT proprietary design which ensures reliability, high on-stream time, and low maintenance costs. The column is made of PFA lined stainless steel which ensures the required corrosion resistance.
- Acid Management: to cool and store the acid, a special type of plate heat exchanger and PTFE-lined tubes and components are used.
- Wet electrostatic precipitator removes the sulfuric acid aerosols formed during condensation in the condensation column. The acid mist emission complies with the environment regulations.
- Tail Gas Reactor: specially applied, if very high overall efficiency or very low emissions are required.
- Scrubber units: for special requirement, several scrubber types as feed gas scrubbers to remove impurities or tail gas scrubber as NaOH or H₂O₂ scrubber maybe added to achieve an optimal plant performance.
Key Advantages
- Robust, high-quality acid condensation column
- Guaranteed low SO2 emission and high sulfur oxidation efficiency
- Highly efficient heat recovery system
- Guaranteed low acid mist emission
- Simple automated operation
- Compact, modular construction
Our customers include:
- Refineries
- Steel industry
- Power industry
- Viscose industry
Oxysulf LC – Low Concentration
download OXYSULF HC_LC flow diagram
The OXYSULF LC technology is used for lean H2S and SO2 off gas feed streams. In the reactor the H2S and SO2 is converted
to SO2 by the proprietary catalyst. For concentrations below the autothermal condition, an additional raw
gas preheating is required. With an optional Tail Gas Reactor, SO2 required emission limits are achieved.
Oxysulf HC – High Concentration
download OXYSULF HC_LC flow diagram
For high concentration gas feed OXYSULF HC is used. The process is equipped with a combustion chamber for the thermal oxidation of sulfur compounds and for sulfur combustion if a certain quantity of sulfuric acid is required. The heat recovery system is equipped with a proper waste heat boiler to recover the excess heat after the combustion chamber from the reactor and from the condensation column.
Integrated solutions across the entire sulfur value chain
The OXYSULF portfolio is KVT’s advanced wet sulfuric acid technology designed to convert sulfur-containing process streams into high-value sulfuric acid while achieving maximum sulfur recovery, low emissions, and high energy efficiency. Based on proven thermal and catalytic oxidation processes, OXYSULF enables the direct recovery of sulfur from a wide range of sulfur-bearing gases, transforming environmental challenges into valuable products. The technology combines sulfur oxidation, sulfuric acid condensation, heat recovery, and emission control in a highly integrated process that delivers reliable operation and superior environmental performance.
Beyond wet sulfuric acid production, KVT provides engineering solutions across the entire sulfur value chain. Our expertise includes sulfur handling and storage, sulfur combustion, SO₂ generation, sulfuric acid and oleum production, absorption systems, spent acid regeneration, sulfur recovery, tail gas treatment, and advanced emission control technologies. This comprehensive approach allows clients to optimize sulfur utilization, improve plant efficiency, and meet the most stringent environmental requirements with a single technology partner.
Technology in Detail
The OXYSULF technology is an innovative wet process to produce sulfuric acid from off-gas containing sulfur-bearing compounds. This technology pairs sustainability with guaranteed low emissions. OXYSULF technology offers total and reliable solutions for a wide range of industrial sectors.
-
Refineries and petrochemical industry
-
Coal based fertilizer and chemical industry
-
Natural gas processing
-
Viscose industry
-
Power industry
-
Cokes manufacturing
-
Metallurgical industry (Cu, Mo, Pb, …)
For each client and their application, a specific plant configuration is developed to achieve an optimal solution.
Plant configurations depend on feed composition and impurities.
-
Type of sulfur-compounds in the feed (H₂S, CS₂, COS, SO₂, R-SH, spent acid or sulfates, …)
-
Concentration of sulfur-compounds in feed (low/high)
-
Clean or dirty feeds
-
Liquid/gaseous feed
-
Emission requirements of local authorities
-
Additional sulfur burning for higher H₂SO₄ production
-
Additional products are required
OXYSULF plants are easily operated and highly automated to minimize operator working time and maximum availability.
OXYSULF plants have a compact design with modular parts which means easy installations and easy integration into existing industrial plants:
- Combustion and waste heat boiler unit
- Reactor: to achieve high overall conversion, special TARDIGRAD catalysts are used (a noble metal-based catalyst for wide temperature range, low pressure drop and high conversion rate).
- Heat recovery system: uses a heat transfer fluid to achieve the maximum efficiency. Due to the exclusive design the excess heat is recovered from the reactor and from the condensation column as the acid cooler to recover it efficiently in the process or externally.
- Condensation unit: the acid condensation column is based on a new KVT proprietary design which ensures reliability, high on-stream time, and low maintenance costs. The column is made of PFA lined stainless steel which ensures the required corrosion resistance.
- Acid Management: to cool and store the acid, a special type of plate heat exchanger and PTFE-lined tubes and components are used.
- Wet electrostatic precipitator removes the sulfuric acid aerosols formed during condensation in the condensation column. The acid mist emission complies with the environment regulations.
- Tail Gas Reactor: specially applied, if very high overall efficiency or very low emissions are required.
- Scrubber units: for special requirement, several scrubber types as feed gas scrubbers to remove impurities or tail gas scrubber as NaOH or H₂O₂ scrubber maybe added to achieve an optimal plant performance.
Key Advantages
- Robust, high-quality acid condensation column
- Guaranteed low SO2 emission and high sulfur oxidation efficiency
- Highly efficient heat recovery system
- Guaranteed low acid mist emission
- Simple automated operation
- Compact, modular construction
Our customers include:
- Refineries
- Steel industry
- Power industry
- Viscose industry
Oxysulf LC – Low Concentration
download OXYSULF HC_LC flow diagram
The OXYSULF LC technology is used for lean H2S and SO2 off gas feed streams. In the reactor the H2S and SO2 is converted
to SO2 by the proprietary catalyst. For concentrations below the autothermal condition, an additional raw
gas preheating is required. With an optional Tail Gas Reactor, SO2 required emission limits are achieved.
Oxysulf HC – High Concentration
download OXYSULF HC_LC flow diagram
For high concentration gas feed OXYSULF HC is used. The process is equipped with a combustion chamber for the thermal oxidation of sulfur compounds and for sulfur combustion if a certain quantity of sulfuric acid is required. The heat recovery system is equipped with a proper waste heat boiler to recover the excess heat after the combustion chamber from the reactor and from the condensation column.
References
Location : Malaysia
Capacity: 15.000 Nm³/h
Year of Commissioning: 2012
Scope of Supply: Licence Business and Key Equipment
Location: China
Capacity: 20.000 Nm³/h
Year of Commissioning: 2012
Scope of Supply: Licence Business and key equipment
Location: Bulgaria
Capacity: 50.000 Nm³/h
Year of Commissioning: 2015
Scope of Supply: EPCM
