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Time：2025-07-14 14:55:14 Reading volume：
The deacidification device of the oil filter is an additional module or independent system specially used to remove acidic substances (such as organic acids and oxidation products) in the oil. Its function is to neutralize or separate the acidic components in the oil to prevent oil degradation, equipment corrosion and sludge formation. The following is a detailed analysis:
(1) Adsorption method (commonly used)
- Materials: Use activated alumina, silica gel, molecular sieve, or special adsorbent (such as alkaline clay).
- Process: The oil flows through the adsorbent bed, and the acidic substances are chemically adsorbed or neutralized.
- Effect: The total acid number (TAN) in the oil can be reduced to <0.1mg KOH/g.
(2) Alkali neutralization method
- System: Add a trace amount of alkaline agent (such as amine compounds) to the oil to neutralize the acidic substances through a mixing reaction.
- Features: The amount of addition must be precisely controlled to avoid overreaction.
(3) Electrostatic agglomeration and acid removal
- Technology: High-voltage electrostatic field causes acidic colloidal particles to agglomerate, and then separates them by filtration.
- Advantages: Applicable to trace acidic pollutants (such as transformer oil).
| Components | Function |
|----------------------|-------------------------------------------------------------------------------------------------------------------------------------|
| Adsorption tower | Filled with adsorbent, the oil slowly passes through to fully contact (the adsorbent needs to be replaced regularly). |
| Mixing reactor | The core of the alkali neutralization method, equipped with a stirrer and a reagent injection system. |
| Precision filter | Intercepts the adsorbent particles that fall off after adsorption (usually 1~5μm). |
| Acid value monitor | Real-time detection of oil TAN value, feedback control of the acid removal process (high-end equipment configuration). |
- Transformer oil: Remove low-molecular organic acids generated by oxidation to prevent the degradation of insulation performance.
- Turbine oil: neutralizes sulfate acid produced during operation and delays sludge formation.
- Industrial lubricating oil: handles acidity increase caused by high temperature oxidation (such as rolling mill lubricating oil).
- Processing capacity: usually matches the flow rate of the oil filter (such as 1000L/h oil filter with 0.5m³ adsorption tower).
- Acid removal efficiency: a single pass can reduce TAN by 30%~70% (depending on the initial acid value).
- Temperature requirements: the best working temperature is 50~70℃ (improve adsorption efficiency).
- Adsorbent replacement: When the outlet oil TAN no longer decreases, it needs to be replaced (usually every 200~500 hours).
- System cleaning: prevent adsorbent dust from clogging subsequent filter elements.
- Compatibility test: Some adsorbents may react with additives and need to be tested in advance.
Precautions
- Safety risks: Strong acidic oil may corrode equipment, so acid-resistant materials (such as 316L stainless steel) must be selected.
- Environmental protection treatment: Waste adsorbents must be disposed of as hazardous waste (containing acidic compounds).
The acid removal device is a key optional module for high-end oil filters, especially suitable for fields such as power and petrochemicals that are sensitive to the acid value of oil products. When selecting, the technical solution must be matched according to the oil type, initial acid value and target purification requirements.
