Treatment of Highly Emulsified Acidic Water in Coking
Process Overview
Process Introduction
The treatment of highly emulsified coking sour water has always been one of the most challenging issues in the petroleum refining industry. The sour water generated from coking contains high concentrations of various components with particularly complex compositions: high coke powder content with small particle size distribution, high oil content with severe emulsification, high levels of sulfur, ammonia nitrogen and phenols, and complex compositions with large fluctuations in content. Without proper treatment before entering the stripper tower, it easily causes blockages in the stripper tower. Large amounts of emulsified oil and suspended solids (coke powder) affect the stripping efficiency and liquid ammonia quality, and in severe cases cause unplanned shutdowns.
Traditional treatment methods usually adopt chemical agents for treatment, but problems such as large chemical dosage, generation of large amounts of scum and sludge, unstable treatment effects still exist, while bringing the risk of secondary pollution. Sinokle has specially developed a coking sour water treatment device with CDFU cyclone dissolved air flotation + fine filter + KHC high-efficiency coalescing oil remover as the core, adopting pure physical demulsification separation without adding chemical agents. The wastewater passes through coarse filtration -> CDFU deep treatment -> fine filtration -> KHC coalescing oil removal in sequence. The on-site effluent appears bright and clear, with oil content reduced to below 73.8 mg/L and oil removal rate reaching over 99%.
CDFU cyclone dissolved air flotation for high-efficiency oil and solids removal + fine filtration for deep suspended solids removal + KHC high-efficiency coalescing oil remover for pure physical demulsification, fully enclosed pressurized operation, no chemical agents required.
| Parameter | Process Influent | Process Effluent |
|---|---|---|
| Oil Content | High oil content (severe emulsification) | <73.8mg/L |
| Coke Powder / Suspended Solids | High coke powder content, small particle size distribution | Bright and Clear |
Coking Emulsified Sour Water CDFU+KHC Coalescing Oil Removal Process Flow Diagram
Technical Advantages
Technological Advantage
No chemical agents required, avoiding large chemical dosage and scum/sludge problems, fundamentally eliminating secondary pollution risks
Pure physical demulsification with excellent and stable separation effect, effectively separating emulsified oil and suspended solids, oil removal rate over 99%
Recovered waste oil is of excellent quality with low water content, can be sent back for refining, saving resources while generating economic benefits
CDFU cyclone dissolved air flotation relies on oil-gas-water three-phase density difference for high-efficiency separation, deeply removing oil and suspended solids
Fully automatic, enclosed pressurized operation, no acidic gas leakage, no safety or environmental risks, ensuring operator safety
Skid-mounted design with small footprint, low operating cost, long maintenance cycle, high automation level, low labor cost
Technical Comparison
Technical Comparison
| Comparison Item | Traditional Flotation + Membrane/Coalescer | CDFU + KHC Coalescing Separator |
|---|---|---|
| Separation Principle | Traditional flotation + membrane filtration/filter + coalescer, requires multi-stage series connection | Cyclone dissolved air flotation + coalescing, concise and efficient process |
| Emulsified Oil Removal | Only partial emulsified oil can be removed, poor effect on highly emulsified water | Removes most emulsified oil, pure physical demulsification is thorough |
| Secondary Pollution | Adding chemicals or acid/alkali washing generates secondary pollution | No chemicals, pure physical demulsification separation, recovers high-quality crude oil, no secondary pollution |
| Recovered Oil Quality | Partial demulsification, high suspended solids and water content, poor quality | Pure physical demulsification, low suspended solids and water content, high quality for refining |
| Operational Stability | Unstable, poor reliability, large fluctuation in effluent quality | Stable effluent meeting standards, good reliability, oil removal rate over 99% |
| Comprehensive Cost | High energy consumption, chemical dosing, short maintenance cycle, high cost | Low energy consumption, no chemicals, long maintenance cycle, low cost |
Application Cases
Application Case
Sinopec Luoyang Coking Sour Water Treatment Project - Treatment Effect Comparison
