Dongying Zhenghang Petrochemical · Coker Gas Oil Denitrification

Background

Coker gas oil basic nitrogen typically exceeds 1000 ppm — 2–3× that of straight-run gas oil. As FCC feed, basic nitrogen preferentially adsorbs on catalyst acid sites, reducing activity, increasing coke yield, and decreasing gasoline/LPG yield. Dongying Zhenghang sought an economical, reliable denitrification process to improve coker gas oil catalytic processing performance.

Benxin Solution

Benxin prepared a coker gas oil complexation denitrification project plan: 95–105°C coker gas oil from the delayed coker is mixed with denitrification agent via static mixer, then held in a denitrification settling tank for 24–48 hours. Denitrified oil is drawn from mid-upper layer; nitrogen complex derivatives discharged from tank bottom. Atmospheric operation, low investment, no hydrogen required; simultaneous metals and Conradson carbon reduction.

• 📉 Basic nitrogen removal 70–81% (dosage 1.0–1.4%)
• ⚙️ Atmospheric tank farm settling — low investment, fast deployment
• 🌿 Complex derivatives blended into asphalt/petroleum coke — zero wastewater
• 🤝 On-site engineer support for bench, pilot, and unit commissioning

Project planning phase; field data per commissioning. See Hongrun Changyi denitrification case for measured data.