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Coffee Processing (Practical Action Technical Brief)
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=== Percolation batteries === This is the most common method. The roasted and ground coffee is held in a series of 5-8 vessels. Hot water is passed through the vessels and, when the soluble coffee solids have been fully extracted from each vessel, it is isolated from the battery and spent coffee discharged. A new vessel replaces this exhausted vessel (see Figure 4). As the extraction takes place at 175ºC, the system needs to be under pressure. A solution of 15-25% w/w of soluble material is produced which can then be dried.
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