Deep naphthenic acid removal under mild conditions (80-85℃, atmospheric pressure) — not just anti-corrosion deacidification, but turning naphthenic acid into a resource: closed-loop chemical recovery and a profitable by-product turn deacidification from a cost center into a profit center
Naphthenic acid corrosion runs through the entire refining process, threatening long-cycle safe operation and driving up maintenance costs.
A high acid value makes electric desalting demulsification difficult, with high calcium, iron and sodium salt content disrupting steady downstream operation and product quality.
Traditional caustic-wash electric refining deacidification generates acidic wastewater that is difficult and costly to treat, and the valuable naphthenic acid is not recovered.
High chemical consumption becomes a fixed cost, by-product value goes untapped, and overall processing profitability is limited.
Using a proprietary complexing deacidification agent, under mild conditions (80-85℃, atmospheric pressure) it undergoes a selective complexation reaction with the naphthenic acid in crude distillate fractions (such as gas oil and diesel); the resulting complex derivative is removed by settling separation.
| Item | Value |
|---|---|
| Unit capacity | 200,000 tonnes/year |
| Operating temperature | 80-85℃ (atmospheric) |
| Distillate oil acid value | Above 5.0 mgKOH/g |
| Post-treatment acid value | <1.0 mgKOH/g |
| Refined oil yield | ≥92% |
| Feed stability | 25 tonnes/hour (twin-tank alternating) |
Temperature, flow, level and dosing are all under automated control for stable operation. Core equipment: dedicated settling tanks, static mixer, precision metering injection system, complex transfer pump, and flash tower (for residual solvent recovery).
This is what sets this technology package apart from traditional deacidification — it goes beyond separating out naphthenic acid to achieve recycling and value creation across the whole material system, turning deacidification from a "pure cost" into a "profit center."
The complex derivative is processed through acidification, neutralization, distillation, extraction and electrodialysis, achieving deacidification agent recovery ≥85% and solvent recovery ≥95%; recycling these directly lowers per-tonne processing cost and cuts hazardous waste at the source.
The deacidification and recovery process generates no solid waste, with no environmental compliance burden.
Crude naphthenic acid is separated, acidified, washed and dehydrated from the complex derivative for further refining. Naphthenic acid is an important chemical raw material (additives, catalysts, surfactants, etc.), converting directly into economic value.
Share your feedstock oil's acid value and other properties, and our technical team will provide a tailored deacidification proposal, economic analysis, and bench evaluation