Phenyl silicone oil is widely used in electronics, aerospace, precision machinery and other fields due to its excellent high and low temperature resistance, insulation, chemical stability and lubrication performance. However, as the use time increases, phenyl silicone oil may fail due to oxidation, pollution or performance degradation. Its regeneration and recycling have become an important issue to reduce the cost of use and reduce environmental pollution.

1. Causes of failure of phenyl silicone oil
Physical aging: Long-term high temperature or shearing causes molecular chain breakage and viscosity decrease.
Chemical pollution: Water, impurities, metal ions and other pollutants cause oxidation or increase in acid value.
Additive failure: Antioxidants, anti-wear agents and other additives are exhausted and performance decreases.

2. Regeneration technology route
The regeneration of phenyl silicone oil needs to select a suitable method according to the cause of failure. Common technologies include:
- Physical regeneration
Filtration and impurity removal: Remove mechanical impurities and particulate matter through precision filtration (such as nano-scale filter elements).
Centrifugal separation: Use centrifugal force to separate water and heavy pollutants.
Vacuum distillation: Distillation under vacuum conditions to remove low-boiling impurities and volatile substances.
- Chemical regeneration
Adsorption refining:
Use activated clay, silica gel or molecular sieve to adsorb polar pollutants (such as acids and oxides).
For example, after waste phenyl silicone oil comes into contact with activated clay, the acid value can be significantly reduced by filtering to remove the adsorbent.
Solvent extraction:
Use polar solvents (such as methanol and ethanol) to extract oxidation products and additive residues.
Reuse the solvent after recovery to reduce costs.
Chemical neutralization:
For waste oil with increased acid value, add alkaline substances (such as sodium hydroxide) to neutralize the acidic substances.
- Adding additives
After regeneration, antioxidants (such as phenols, amines), anti-wear agents (such as molybdenum disulfide), etc. are added to restore the performance of the oil.
- Catalytic regeneration
Promote the decomposition and recombination of oxidation products through catalysts (such as acid clay and metal oxides) to restore the molecular structure of silicone oil.

3. Regeneration process case
Process of a certain enterprise:
Waste phenyl silicone oil → centrifugal separation (moisture removal) → vacuum distillation (volatile removal) → activated clay adsorption (deacidification) → filtration → additives → finished product.
Effect: The viscosity recovery rate of the recycled oil is more than 90%, and the acid value is reduced to less than 0.1 mgKOH/g.
Solvent extraction method:
Waste oil and methanol are mixed in a volume ratio of 1:1, stirred and extracted, and then allowed to stand for stratification, the upper silicone oil is separated, and the methanol is distilled and recovered.
Advantages: Simple operation, suitable for light pollutant removal.

4. Recycling strategy
Graded utilization:
High-quality recycled oil is used for precision equipment, and low-quality oil is used for non-critical parts or downgraded to heat transfer oil.
Closed-loop management:
Establish a waste oil recovery system and cooperate with suppliers to achieve a "production-use-regeneration-reuse" closed loop.
Policy support:
The government encourages enterprises to use recycled lubricants and provides tax exemptions or subsidies.

5. Technical Challenges and Prospects
Technical bottlenecks:
Phenyl silicone oil has a complex molecular structure and is prone to crosslinking or degradation during the regeneration process, affecting performance.
The performance gap between recycled oil and new oil is large, and the additive formula needs to be further optimized.
Development direction:
Develop efficient catalysts and green solvents to reduce regeneration energy consumption and pollution.
Combined with nanotechnology, improve the antioxidant and anti-wear properties of recycled oil.

6. Conclusion
The regeneration and recycling of phenyl silicone oil lubricants have significant economic and environmental benefits. Through the combination of physical, chemical and catalytic regeneration technologies, efficient regeneration of waste oil can be achieved, but the process parameters need to be optimized for specific application scenarios. In the future, with technological progress and policy promotion, the recycling of phenyl silicone oil will become a key direction for the sustainable development of the industry.