Ultrasonic Emulsification Of Naphtha Fuel And Water For Octane Number Improvement
May 13, 2026
In the chemical industry, naphtha from chemical processes often has insufficient octane number, limiting its application in high-performance fuels. Incorporating water into naphtha via ultrasonic emulsification is an efficient, eco-friendly solution to this problem. This article focuses on its application in the industrial scenario with a naphtha flow rate of around 100 Kg/h and a water content of 30%-40%, summarizing the core principles, process design, advantages and key considerations.
1. Demand and Core Mechanism
Low octane number of naphtha may cause combustion knocking, reducing efficiency and damaging equipment. Traditional chemical antiknock agents increase costs and pollution, while water-naphtha emulsions can solve this by the "micro-explosion" effect: water droplets vaporize rapidly during combustion, breaking oil droplets into smaller particles to suppress knocking and improve octane number. The 30%-40% water content requires high-efficiency emulsification to avoid phase separation.
Ultrasonic emulsification relies on cavitation effect: high-frequency ultrasonic vibration generates alternating pressure pulses, forming and collapsing cavitation bubbles to produce shock waves and micro-jets. These break water into micron-level droplets, evenly dispersing them in naphtha to form a stable emulsion, without chemical emulsifiers.
2. Key Process Design (100 Kg/h Flow Rate)
The process includes four stages: Raw material pretreatment removes impurities from naphtha (400-mesh filtration, water content <0.5%) and uses deionized water to avoid scaling. Pre-mixing uses a static mixer to blend 100 Kg/h naphtha with 42.8-66.7 Kg/h water (30%-40% content) at 25-35℃.
The core ultrasonic emulsifier (5-10 kW, 20-80 kHz adjustable) uses 20-40 kHz frequency, 5-8 W/cm² power density, and 30-60 seconds residence time to ensure droplets <2 μm. Multi-probe 316L stainless steel equipment ensures uniform energy distribution. Post-treatment inspects particle size and stability (48-hour non-stratification), with storage at 20-40℃ and use within 30 days.
3. Advantages and Key Notes
Ultrasonic emulsification outperforms traditional methods: it forms stable emulsions (30+ days stability), increases octane number by 3-5 units, saves 30% energy, and suits continuous 100 Kg/h production with low failure rate.
Key considerations: Control water content within 30%-40% to avoid stratification; maintain 25-35℃ emulsification temperature; regularly clean/replace ultrasonic probes; troubleshoot stratification by adjusting power, residence time, water content or raw material purity.
4. Conclusion
Ultrasonic emulsification is reliable for improving naphtha octane number by incorporating water. Reasonable process and parameter design ensures stable emulsions for the target scenario, offering efficiency, stability, energy savings and environmental benefits, providing a new path for high-value naphtha utilization.