Black Liquor Evaporation Antifoam (Silicone Defoamer)
Silicone-based antifoam agents designed for kraft black liquor evaporation are used to suppress foam formation during the concentration of spent cooking liquor in multi-effect evaporators. Uncontrolled foaming in evaporators causes carryover, equipment fouling, and reduced evaporation efficiency. These high-temperature-stable, alkali-resistant antifoams are effective at trace dosage levels in highly caustic, high-solids black liquor.
Technical Specifications
| pH | 6.0–8.0 |
| appearance | White to off-white viscous emulsion |
| solid content (%) | 10±2 |
| temperature stability | Stable up to 150°C |
Applications
- Kraft black liquor multi-effect evaporator foam control
- Green liquor and white liquor clarification foam suppression
- Chemical recovery boiler feed liquor defoaming
- Tall oil and soap skimming process foam control
- Caustic evaporation and concentration operations
Key Features
- Stable under high-temperature, highly alkaline black liquor conditions
- Effective foam collapse and prevention at low dosage (10–50 ppm)
- Does not contaminate tall oil soap or reduce recovery efficiency
- Suitable for continuous or intermittent dosing systems
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