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Melt crystallization offers the opportunity to produce ultrapure products, at low energy consumption compared to distillation processes and without additional solvents like in extraction processes. To reach the desired purity in melt suspension crystallization proper solid-liquid separation and washing steps are required. Hydraulic wash columns combine these two steps in one piece of equipment at a relatively high throughput and with a simple design. The research on the hydraulic wash column is part of the research project called 'Fractional Cooling Crystallization.' This project was carried out at the Laboratory for Process Equipment at the Delft University of Technology and aims at the development of melt suspension crystallization processes for application on industrial scale.