A simple way to treat Claus Tail Gas for Natural Gas Processing Plants and Petroleum Refineries.

When it comes right down to it, there aren't many tail gas treating processes that can get your sulfur recovery up to 99.8% or higher as is frequently required by regulation. The traditional choice for extremely high recovery has been H₂S absorption and recycle processes (with their reducing gas generator, hydrogenation reactor, quench, and amine system).

Capital costs for this type of tail gas treatment are often as high if not higher than the Claus unit itself. In addition, recycling H₂S and CO₂ back to the Claus reaction furnace adds unnecessary load.

CrystaSulf is a new, breakthrough technology that offers many advantages over the traditional approach to high-efficiency Claus tail gas treating.

CrystaSulf convert H₂S and SO₂ in the tail gas directly to sulfur in a simple, low-temperature liquid system.

CrystaSulf can achieve 99.8+% overall sulfur recovery without any recycle streams at a fraction of the cost of the traditional technologies.

Advantages

Lower cost

• Lower capital cost
• Lower operating cost

Simpler plant

• Simpler to build
• Simpler to operate

No recycle of H₂S, CO₂, or SO₂

• Does not reduce Claus reaction furnace capacity or temperature
• Simplifies Claus unit controls

No reducing gas generator or incinerator on the gas stream entering the tail gas treater

• Avoid installing and operating the equipment
• Avoid the high temperatures
• Smaller tail gas stream to treat

No hydrogenation reactor needed

• Avoid installing and operating the equipment
• Avoid initial and replacement catalyst cost

No quench water system needed

• No sour water to deal with
• No weak acid streams to manage

More efficient scrubbing of sulfur vapor

• Sulfur very soluble with CrystaSulf
• Sulfur vapors scrubbed to <10 ppm

Better conditions for liquid phase H₂S/SO₂ reactions

• Operates at 120°-180°F versus others at greater than 250°F where equilibrium limits conversion
• Solution buffering capacity maintains removal during Claus tail gas ratio swings

CrystaSulf

A simple way to treat Claus Tail Gas

Compare with some other recycle processes.