Application guide

Refinery Fuel-Gas H₂S Scavenger — Triazine

Refinery fuel gas, FCC/coker off-gas and low-pressure streams can carry residual hydrogen sulfide even downstream of amine treating. A triazine H₂S scavenger polishes that residual H₂S to protect burners, meet emissions limits and prevent corrosion.

Quick answer: triazine is a non-regenerative polish for residual H₂S in refinery fuel gas and off-gas — ideal after amine treating, on small/intermittent streams, and during upsets. MEA Triazine 78% for cost-effective bulk polishing; MMA Triazine 40% for hotter/continuous service.

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Where It Fits in the Refinery

  • Fuel-gas header polishing downstream of amine treating
  • FCC and coker off-gas
  • Low-pressure / intermittent gas streams without their own amine unit
  • Flare-gas recovery
  • Upset and turnaround H₂S mitigation

Scavenger vs Amine Unit

Triazine is most economical as a non-regenerative polish below a few hundred ppm H₂S. High, continuous loads belong to regenerative amine treating; triazine handles the residual, the small streams and the upsets — often at far lower CAPEX.

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Frequently Asked Questions

Why scavenge H2S from refinery fuel gas if there is an amine unit?+
Amine treating removes the bulk of H2S, but residual H2S can remain during swings, amine-unit upsets, or in smaller off-gas/low-pressure streams that do not justify their own amine system. A triazine scavenger polishes that residual H2S so fuel gas protects burners, meets emissions limits and avoids corrosion.
Where is triazine applied in a refinery gas system?+
Typical points are fuel-gas headers downstream of amine treating, FCC and coker off-gas, low-pressure or intermittent gas streams, and flare-gas recovery. Injection is by quill/mixer with enough contact time, or via a small contactor where the H2S load justifies it.
Which triazine grade suits refinery gas polishing?+
MEA Triazine 78% gives high active content for cost-effective polishing; MMA Triazine 40% is chosen for hotter or continuous service where more soluble by-products reduce solids/scaling. Grade is matched to temperature, H2S load and stream type.
Is a scavenger a replacement for an amine unit?+
No — triazine is a non-regenerative polish/backup, most economical below a few hundred ppm H2S. For high, continuous H2S loads, regenerative amine treating is the primary technology; triazine handles the residual, the small streams and the upsets.
How is over-treatment and solids avoided?+
Dose to the measured H2S load, select a soluble-by-product grade for hot streams, ensure mixing/contact time, and monitor spent scavenger. Polymeric dithiazine fouling is driven by highly spent MEA triazine left under continued H₂S exposure, so the goal is to manage the scavenger before it becomes over-spent — not to under-dose.
Do you supply triazine for refineries and gas plants?+
Yes. Vasudev Chemo Pharma manufactures MEA Triazine 78% and MMA Triazine 40% and exports globally with batch COA and application guidance for refinery fuel-gas and off-gas H2S polishing.

Polishing H₂S in refinery gas?

Vasudev Chemo Pharma supplies MEA Triazine 78% and MMA Triazine 40% with application guidance, batch COA, and global export from our ISO 9001:2015 certified facility in Gujarat, India.

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