Can MVR Evaporators Be Used for Calcium Chloride Concentration?

Calcium Chloride Evaporation 

Calcium chloride is a versatile product, ranging from anhydrous granules to dihydrate flakes. In industrial production, it can be manufactured not only from hydrochloric acid and limestone in the chlor-alkali process, but also from by-product hydrochloric acid generated in barium chloride production and lithium hexafluorophosphate (LiPF₆) production, through reaction with limestone.

However, its high solubility, significant boiling point elevation (BPE), and corrosive nature make the evaporation process technically challenging. Effective process design and appropriate material selection are therefore critical to ensure efficient, reliable, and long-term operation.

Understanding the role of MVR

With the growing adoption of Mechanical Vapor Recompression (MVR) technology, its energy-saving potential makes it the preferred choice where energy costs are high. 

However, its suitability for calcium chloride concentration depends largely on the solution concentration:

Low to moderate concentrations (< 35%): MVR evaporator is highly efficient.

Higher concentrations (> 35%): The sharp rise in boiling point makes the temperature lift requirements steep. This could demand multiple compressors connecting in series, leading to higher power consumption and reducing the cost-saving benefits.

Recommended Process Strategy

Concentration range	Recommend process	Typical product
<5%  →~ 35%	MVR evaporator- Efficient concentration with low energy use.	Feed for multi-effect evaporator stage
~35% → ~50%	Multiple-Effect Evaporator – to reach ~50%, this concentration is ideal feedstock for spray granulation & fluidized-bed drying system to produce granule products	94% Anhydrous CaCl₂ granules
~50% → 68~70%	Multiple-Effect Evaporator + Single-Effect Finisher (high-pressure & high-temperature steam is needed as heat source to reach ~70%) –  The 68~70% CaCl₂ solution can be cooled and flaked to make calcium chloride dihydrate flakes, which are then dried in a fluidized-bed to get the final flake product.	77% CaCl₂ dihydrate flakes

Why Our Solutions Stand Out

Tailored Process Design: Whether you need granules or flakes, we design systems optimized for your production goals.

Energy-Efficient Operation : Integrating MVR evaporator and multiple-effect evaporator ensures the best balance between efficiency and performance.

Durable Materials:  Equipment is built with carefully selected alloys to handle the corrosive properties of calcium chloride, tailored to different concentration and operating temperatures. This approach not only optimizes economic performance, but also ensures long-time, reliable operation while minimizing maintenance and downtime.