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The Spray Drying Process

The Spray Drying Process

2025-04-04 The spray drying process is older than might commonly be imagined. Earliest descriptions date from 1860 with the first patented design recorded in 1872. The basic idea of spray drying is the production of highly dispersed powders from a fluid feed by evaporating the solvent. This is achieved by mixing a heated gas with an atomized (sprayed) fluid of high surface-to-mass ratio droplets, ideally of equal size, within a vessel (drying chamber), causing the solvent to evaporate uniformly and quickly through direct contact. Spray drying can be used in a wide range of applications where the production of a free-flowing powder is required. This method of dehydration has become the mo…

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Design and Control of Spray Dryer

Design and Control of Spray Dryer

2025-04-04 The challenges facing both designers and users are to increase production, improve powder quality and reduce costs. This requires an understanding of the process and a robust control implementation. Spray drying consists of the following phases:Feed preparation: This can be a homogenous, pumpable and free from impurities solution, suspension or paste.Atomization (transforming the feed into droplets): Most critical step in the process. The degree of atomization controls the drying rate and therefore the dryer size. The most commonly used atomization techniques are:1. Pressure nozzle atomization: Spray created by forcing the fluid through an orifice. This is an energy efficient met…

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