Spray drying

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Spray drying is a method of producing a dry powder from a liquid or slurry by rapidly drying it with a hot gas. This is the preferred method of drying of many thermally-sensitive materials such as foods and pharmaceuticals. A consistent particle size distribution is a reason for spray drying some industrial products such as catalysts. Air is the heated drying media; however, if the liquid is a flammable solvent such as ethanol or the product is oxygen-sensitive, then nitrogen is used.[1]

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