5 years ago

Cooling Crystallization of Sodium Chloride via Hollow Fiber Devices to Convert Waste Concentrated Brines to Useful Products

Cooling Crystallization of Sodium Chloride via Hollow Fiber Devices to Convert Waste Concentrated Brines to Useful Products
Tai-Shung Chung, Lin Luo, Jian Chang
Cooling crystallization via hollow fiber devices emerges as a new technology suitable for salt production from concentrated seawater brine. To generate high-quality NaCl crystals, a solid hollow fiber cooling crystallization (SHFCC) system was developed in this study using lab-made PVDF hollow fibers as the heat-exchanger and magnetic stirring as the downstream mixing device. Experiments were conducted to investigate the influences of downstream agitation methods and operation parameters on crystal properties. Narrowly distributed NaCl crystals with a small size of around 35 μm were successfully produced by the SHFCC system combined with ultrasonication or magnetic stirring. Specifically, the magnetic stirring-based agitation was the most effective in facilitating crystal generation with the highest rates of nucleation and crystal salt production due to the enhanced mass transfer in the diffusion-controlled crystallization process. The influences of feed solution and stirring speed on NaCl crystal production were also investigated and optimized. When treating a concentrated synthetic seawater, the SHFCC system with the optimal agitation method demonstrated a maximal nucleation rate of 8.38 × 108 no./m3 s, a high salt production rate of 598.4 g/m2 h, and a high purity (∼99%) of NaCl salt crystals.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02818

DOI: 10.1021/acs.iecr.7b02818

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