Flash Evaporation / Crystallisation

Flash evaporation or crystallisation is used to cool a hot brine (and precipitate a compound) without heat exchangers coming into contact with the process liquid or slurry. It provides longer operation cycles for the evaporator or crystalliser, as the scale formation in equipment is reduced substantially. Feedstock is exposed to low pressure, and flashes (boils) under controlled conditions. The flash generates vapour is condensed separately. The removal of water concentrates and cools the feed and leads to precipitation of product crystals. Forced Circulation or Draft Tube Crystallisers are used for this operation as well as Flash vessels.