Coker Gas Oil Denitrification — Complete Solution
Non-hydrogenation complex denitrification process · basic nitrogen removal rate 70%~81% · Improve FCC/hydrogenation feed · a Shandong independent refinery and A Shandong Group Refinery have been implemented and verified
The problem: too much basic nitrogen in coker gas oil
Coker gas oil is a secondary processed distillate obtained by coking vacuum residue. Due to the enrichment of nitrogen compounds in the raw material,Basic nitrogen content Usually as high as 800-1500 μg/g, which is 2-4 times that of straight-run wax oil. Core problems caused by high basic nitrogen:
- 📉 Damage the FCC catalyst: Basic nitrogen preferentially adsorbs the acidic center of the catalyst, resulting in decreased activity, increased coke yield, and reduced gasoline yield.
- 📉 Poisoning the Hydrogenation Catalyst: Basic nitrogen competes for adsorption with active components such as hydrogenation catalyst Mo, W, Ni, etc., shortening the operation cycle
- 📉 Affect blending quality: When used as a fuel oil blending component, high nitrogen affects combustion cleanliness and NOx emissions.
The route: non-hydrogenation complexation denitrification
Hubei’s true heart Coker gas oil denitrification agent Using an in-house developed process, complex denitrification is achieved under normal temperature to 60°C and normal pressure conditions, without the need for a hydrogenation unit:
| Process Parameters | Typical Value |
|---|---|
| Add dose | 1.0%~1.4% (w/w, adjusted according to basic nitrogen content) |
| reaction temperature | 80-100°C (existing temperature in the tank area, no additional heating required) |
| Settling time | 24-48 hours (gravity settling) |
| basic nitrogen removal rate | 70%~81% (basic nitrogen reduced from 1000ppm+ to 300-600ppm) |
| Acid value after removal | ≤0.3 mgKOH/g (low acid value type) |
| Oil yield | ≥99.98% |
Implemented cases: A Shandong independent refinery Coker gas oil denitrification project,The Shandong group Refinery A/Refinery B The basic nitrogen dropped from 1136/1585 μg/g to 429.8/772.5 μg/g, the nitrogen removal rate was 61%~73%, and the acid value after removal was 0.15-0.19 mgKOH/g.
What it is worth
Take the 100,000 tons/year coker gas oil denitrification unit (basic nitrogen 1000 ppm, target 300 ppm) as an example:
- 💰 After denitrification, the FCC gasoline yield increases by 2-4%. Based on 100,000 tons of raw material/year, the efficiency increase is about More than 8 million yuan/year
- 💰 Reduce FCC catalyst consumption (catalyst dosage can be reduced by 10-20%), saving approximately 1 million to 2 million yuan/year
- 💰 The initial investment for the non-hydrogenation process is only hundreds of thousands of yuan, usually Investment will be recovered within 3-6 months
- 💰 Simultaneous demetallization (Fe, Ni, etc.) to reduce the risk of downstream catalyst poisoning
Coker gas oil denitrification — FAQ
Free trial evaluation
Mail a 100ml sample of coker gas oil and obtain a professional denitrification effect report (full test of basic nitrogen, acid value, and yield).
Contact us to apply for a trial