H2S Removal in Crude from Marine Tankers

REPLACEMENT OF MEA-TRIAZINE IN TREATMENT OF CRUDE OIL BARGES AND TANKERS USING NON-AMINE H2S SCAVENGER PRO-3.

Additive Direct Services and Q2 Technologies; a former subsidiary of Quaker Chemical which developed the MEA-Triazine scavengers used world-wide today, have brought to the market the Pro-3 series of non-amine H2S scavengers. The Pro-3 series is the next generation of scavengers replacing MEA-Triazine in liquid hydrocarbon streams.

The Pro-3 series is the result of a need to reduce fouling created by amine based scavengers in refineries, production streams and crude oil terminals while improving H2S removal performance compared to that of MEA-Triazine.

CHALLENGES:

• Demurrage fees and interruptions of crude oil loading into barges and tankers at terminals are frequent when H2S levels exceed 10 ppmv.

• High volumes of MEA-Triazine were necessary to reach the required H2S specification of <10 ppmv and scavenger injection pumps struggled to keep up with pipeline flowrates of up to 20,000 barrels per hour into barges and tankers at the terminal.

• Condensate and crude treated with MEA-Triazine were observed to cause fouling and corrosion in neighboring splitters and refining units.

• High level of H2S in some storage tanks required the terminal to have expensive independent H2S monitoring done.

SOLUTION:

• Pro-3 was recommended to replace the 40% MEA-Triazine scavenger to reduce chemical treatment cost, logistics, and fouling problems in splitters and refining units.
• A dual pump on-site injection system and chemical bulk storage with 24/7 support staff allowed for treatment of large volumes of crude oil on demand.

RESULTS:

Pre-treatment H2S level: 10 PPM - 800 PPM determined by ASTM D-5705 (3rd party inspection lab measurements of >100 vessels)
Post-treatment H2S level: <10 PPM
Loaded Volumes: 30,000-650,000 barrels

• Approximately 3 million barrels of EFL/EFR/WTI are treated monthly with the Pro-3 series.
• Chemical consumption was cut by 50% compared to 40% MEA-triazine resulting in:
• Deliveries cut by 50% translating into increased productivity personnel
• $10,000 per month reduction in chemical cost *will vary on requirements
• Injection system keeping up with terminal pipeline flowrates
• Potential demurrage fees ranging from $4,000 - $52,000 per day from out of specification H2S levels were eliminated.
• At one terminal site eleven H2S monitoring personnel were eliminated, resulting in substantial monthly savings.

TAKE-AWAYS:

• >$10k per month chemical savings
• Deliveries cut by 50%