VDP Vacuum Oil Dehydrator/Oil Dehydration Plant is specially produced for dehydration and purification of transformer insulating oil, it adopts double stages vacuum dehydrators, precise filters, high effective heating system and inter protection system, which can improve quality of used insulating oil and reach the standards of new oil. After purification by VDP Vacuum Oil Dehydrator, the oil can be used in transformers or electric equipments again. The development of a strong suction, high breakdown field strength, and excellent compatibility with PP film more synthetic oils. Synthetic oil in its molecular structure, can be divided into aromatic synthetic oils, silicone oils, oil esters, ethers and synthetic sulfone, poly-butene. Common synthetic oils are shown in Table. Table lists the PCB characteristics for comparison. Synthetic purification treatment often used clay adsorption. When the purification treatment, clay oil content of about 0.5 to 3% by weight, the treatment temperature is about 40 ~ 80 ℃. Of polar, synthetic oils containing impurities, it may be appropriate to increase the amount of clay and processing times when refined.