Trouble-free sulfur recovery for small to mid-sized applications such as natural gas, EOR gas, refinery fuel gas, refinery offgas, geothermal vent gas, and others.

Recovering sulfur from gas streams that contain 0.2 to 25 LTPD of sulfur has historically been problematic. In this size range, the operating costs of throw-away H₂S scavenging chemicals are too high, and traditional amine/Claus approaches are unwieldy and capital intensive.

Aqueous-iron redox systems showed promise in this range, but often proved unacceptable because of their operating problems. CrystaSulf^SM, a new breakthrough sulfur recovery technology, can remove sulfur economically without the operating problems of aqueous-iron systems.

Using a gentle SO₂ oxidant, CrystaSulf converts inlet H₂S to elemental sulfur. Elemental sulfur is soluble in CrystaSulf solution; thus, there is no danger of sulfur plugging high-pressure equipment that plagues aqueous-iron systems.

Meeting pipeline H₂S specifications is easy, and CO₂ has been shown to have no effect on the CrystaSulf process.

Advantages

Lower cost

• Lower overall treatment cost
• Much lower maintenance and clean-out costs
• Greater on-stream factor

Can directly treat high-pressure streams

• Solids-free solution is easy to pump
• Requires very low circulation rate

Nonaqueous solvent has high solubility for elemental sulfur

• Has no sulfur particles in circulating liquor
• Needs no sulfur settling additives or surfactants
• Avoids foaming and plugging problems associated with the aqueous-iron redox systems

Wide range of acceptable equipment

• Special designs to handle slurry are not necessary for most equipment
• No sulfur solids in circulating liquor means that trays or packing can be used

High boiling, stable solvents

• No chelates to degrade
• Very low vaporization losses

Produces large sulfur particles

• Sulfur handles, separates, and purifies easily
• Much purer sulfur product than possible with aqueousiron redox systems

Easy control of H₂S removal

• Solution has buffering capacity (changes happen slowly, upsets are moderated)
• Can track/measure dissolved species that correlate directly with removal

CrystaSulf

Trouble-free sulfur recovery for small to mid-sized applications

Compare with other processes for high-pressure applications.