Method for the diafiltration of a product and device for carrying out said method

Abstract

The invention relates to a diafiltration stage for concentrated fruit juices, comprising a cross-flow filtration element (1). The product inlet (2) and the product outlet (3) of the filtration element (1) are united via a circulation pump (5) to form a product circuit, to which product is continuously supplied via a product supply line (6) and from which product can be continuously removed via a product discharge line (8). The permeate outlet (4) of the filtration element (1) is connected to the product circuit via a return line (11) comprising a permeate pump (13), enabling a desired amount of permeate to be returned to the product circuit. In addition, the stage comprises a wash-fluid supply line (10) that is equipped with a wash-fluid pump (12), which is used to supply a desired amount of water to the product circuit as wash fluid. The supplied amounts of permeate and water can be set independently of one another. Said diafiltration stage permits both the degree of washing of the product and the quality and amount of the product retentate and the permeate that is produced to be set and regulated within a wide range, even for fixed operating conditions, such as those required in continuous multi-stage large-scale installations.

Description

technical field [0001] The invention relates to a method for product diafiltration, a device for carrying out the method, a filter device with the device and the use of the device and the filter device according to the preambles of the independent claims . Background technique [0002] Filtration of a product by a membrane filtration mechanism under conditions where a purified fluid is introduced into the product is called diafiltration, whereby the concentration of the filtered content in the product is reduced, i.e., purification of this substance occurs without necessarily resulting in a The enrichment of the unfiltered contents of a product or the concentration of the contents. As purification fluid use is made of product-free purification fluid, such as water or solvent delivered separately, product-specific osmotic agents, which are taken, for example, from a subsequent diafiltration stage, or mixtures of both (for this see R.F.Madsen's Design of sanitary and sterile...

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Problems solved by technology

[0003] The currently known diafiltration processes all suffer from the disadvantage that the product purification rate, i.e. the degree of loss of the filtered content in the product, is in static operating conditions, as they are essential for continuously working multi-stage large equipment. , is not configurable and therefore has only a limited influence on the quality and flow of the concentrate and permeate streams produced

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