Overall solution for denitrification of coked wax oil
Non-hydrogenation complex denitrification process · Dealkalization nitrogen rate 70%~81% · Improve FCC/hydrogenation feed · Dongying Zhenghang and Hongrun Changyi Petrochemical have been implemented and verified
High alkali nitrogen problem in coked wax oil
Coked wax 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 alkali 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.
Non-hydrogenation complex denitrification process plan
Hubei’s true heart Coked wax oil denitrification agent Using national patented technology, complex denitrification is achieved under normal temperature to 60°C and normal pressure conditions, without the need for a hydrogenation device:
| Process Parameters | Typical Value |
|---|---|
| Add dose | 1.0%~1.4% (w/w, adjusted according to alkali nitrogen content) |
| reaction temperature | 80~100℃ (existing temperature in the tank area, no additional heating required) |
| Settling time | 24~48 hours (gravity settling) |
| dealkalization nitrogen rate | 70%~81% (alkali 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: Dongying Zhenghang Petrochemical Industry Coked wax oil denitrification project,Hongrun Group Changyi/Qingzhou Petrochemical The alkali 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.
Economic benefit calculation
Take the 100,000 tons/year coking wax oil denitrification device (alkali 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
Frequently Asked Questions about Denitrification of Coked Wax Oil
Free trial evaluation
Mail a 100ml sample of coked wax oil and obtain a professional denitrification effect report (full test of alkali nitrogen, acid value, and yield).
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