Project description: Anhydrous Sodium Sulfate (Na₂SO₄) Production;
Equipment: MVR evaporator;
Main composition of feedstock: sodium sulfate rich sulution;
PH of feedstock: slightly alkaline;
Evaporation capacity: 20,000.00kg/h;
Construction material: product wetted parts adopt SS316L, non wetted parts adopt SS 304 or carbons steel per actual need.
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.
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.
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.
