Study on the Preparation of Natural Ester Insulating Oil from High-Acid-Value Waste Cooking Oil Based on Multi-Stage Coupled Refining Process

Key Points

• The aim is to develop a natural ester insulating oil from high-acid-value waste cooking oil through a refining process.
• Utilized waste cooking oil as raw material for the preparation
• Implemented a multi-stage refining process
• Measured key properties: acid value, medium loss factor, and breakdown voltage
• Acid value reduced from 21.04 mg KOH/g to 0.024 mg KOH/g
• Medium loss factor decreased from 1.335 to 0.0197 at 90°C
• Breakdown voltage increased from 27.9 kV to 72 kV
• Produced insulating oil met established purity standards