Agitated Nutsche Filter Dryer

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Agitated Nutsche Filter Dryer

ANFD is one of the most popular Filtration cum drying equipment. In a typical Pharmaceutical API (Active Pharma Ingredients) production, after the reaction and crystallization stage, a free flowing slurry is formed which needs Filtration as well as Drying in order to produce a dry powder and granules which are free from impurities. To facilitate this, typically multiple small unit operations are carried out, including, Mechanical Filtration using Centrifuge or Filter Press, followed by Vacuum Or other type of Drying. This is highly time consuming, as well as, cumbersome (both ergonomically, as well as, economically). ANFD combines both these operations easily and effectively, thus producing dry cake with minimum moisture or solvent in it.

WORKING PRINCIPLE OF AGITATED NUTSCHE FILTER DRYER (ANFD)

ANFD consists of a vertical cylindrical stirred tank vessel (somewhat looking like a reactor), which has its shell divided into two parts viz. Main Shell and Bottom Shell, which are separated by means of a mesh Or sieve and a filter cloth covering the sieve. The excess water Or solvent from the wet mass is filtered through and collected in the bottom shell, whereas, the remaining major part of the water or solvent is removed by heating and vacuum drying the wet mass. In short, the solvent or water to be removed, is separated and collected at two different places viz.