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Help CenterMVR Evaporator for Anhydrous Sodium Sulfate (Na₂SO₄) Production
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Project Description
Anhydrous sodium sulfate (Na₂SO₄), commonly referred to as sodium sulfate or thenardite, is widely used in:
• Detergents and cleaning agents
• Glass manufacturing
• Pulp and paper industry
• Dye and textile processing
It is often produced by concentrating sodium sulfate-rich solutions (from brine or chemical by-products) through evaporation and crystallization. MVR evaporators (Mechanical Vapor Recompression) provide a highly energy-efficient solution for this process.
Process Flow
An MVR evaporator system is employed for producing anhydrous sodium sulfate from sodium sulfate-rich solutions. The system primarily consists of the following components:
• Condensate preheater
• Exhaust vapor preheater
• Exhaust condenser
• Forced circulation heater
• Crystallization separator
• Vapor scrubber
• Steam compressor(MVR)
• Thickener
• Mother liquor tank
• Centrifuge
• Pump group
• Piping system
• Electrical control system
These components work together to concentrate the feed solution, induce controlled crystallization of sodium sulfate, and recover both the product and recyclable streams in an energy-efficient manner.
Design Considerations
1. Boiling Point Elevation (BPE)
As concentration increases, BPE rises. This reduces the available temperature difference (ΔT) for evaporation.
Proper BPE calculation is critical for compressor selection and system sizing.
2. Crystallization Behavior
Na₂SO₄ crystallizes as anhydrous salt above ~32.4°C.
The process should maintain supersaturation and control nucleation rates for good crystal size.
3. Scaling Risk & Circulation Design
MVR systems should adopt forced circulation to minimize scaling.
Crystal slurry management is important to prevent clogging.
4. Compressor Sizing
The compressor must provide enough temperature lift to overcome BPE and ensure continuous evaporation.
Oversized compressors increase CAPEX and energy use; undersized ones lead to poor performance.
Conclusion
MVR evaporators in sodium sulfate production help industries transition toward clean, energy-efficient, and sustainable processing. They also enhance the recovery of valuable salts from industrial waste streams, aligning with zero-liquid discharge (ZLD) and circular economy goals.
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