Alkali Concentration

Alkali concentration is the process of recovering and concentrating spent caustic solutions, typically containing NaOH (sodium hydroxide) or KOH (potassium hydroxide). These solutions come from textile mercerization, cleaning-in-place (CIP) systems, soap manufacturing, or dyeing processes. At SEDL, we offer efficient and corrosion-resistant evaporator systems that recover caustic solutions and concentrate them up to 48–50%, suitable for direct reuse.

Challenges in Alkali Concentration

Recovering alkali from spent streams is technically challenging due to

Highly Corrosive Nature

Strong alkalies like NaOH aggressively attack standard metallurgy.

Scaling & Crystallization

Alkali tends to form hard deposits, leading to clogging.

High Boiling Point

Alkali has a higher boiling point than water, requiring special design considerations.

Energy Consumption

Traditional systems consume high energy due to the elevated boiling point.

Safety Hazards

Leakage or spills of concentrated caustic can be hazardous.

Our Solution

SEDL provides a robust alkali concentration system designed for durability, safety, and efficiency

Special Alloys Used

Construction in SS 316L, or FRP-lined materials for long life under corrosive conditions.

Vacuum or Atmospheric Operation

System optimized based on feed concentration and recovery target.

Up to 50% Concentration

Final product can be reused in processes like mercerization or soap manufacturing.

MVR Integration

Mechanical Vapor Recompression for low-energy operation.

Online Cleaning (CIP)

For fouling reduction and ease of maintenance.

Why Choose SEDL?

SEDL Alkali Concentrators are tailor-made to recover value from waste caustic, reduce chemical purchase, and improve plant sustainability all while ensuring safety and efficiency.