A system and a process for membrane filtration of a dispersion

Details A system and a process for membrane filtration of a dispersion A system and a process for membrane filtration of a dispersion

B - Operations, Transporting

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B01D 61/58 (2006.01) A23C 9/142 (2006.01) A23C 19/05 (2006.01) B01D 61/14 (2006.01) B01D 63/00 (2006.01)

Patent

CA 2135077

2135077 9322037 PCTABS00027 A dispersion having an aqueous continuous phase is membrane filtrated in one or more membrane filtration steps, where a feeding dispersion fed to a filtration membrane is separated in each step into a retentate retained by the filtration membrane and a permeate passing through said filtration membrane, whereby the retentate from one step can be used, if desired, as a feeding dispersion or a portion thereof in one or more succeeding steps. The permeate resulting from one or more steps is subjected to a concentration to form a concentrated fraction containing an increased concentration of the dry matter or a portion thereof present in the permeate, and this concentrated fraction is returned as a portion of the feeding dispersion in one or more membrane filtration steps. A system for membrane filtration of such dispersion comprises one or more membrane filtration units each associated with a feeding pipe, a retentate exit pipe, and a permeate exit pipe, one or more of the permeate exit pipes (8n-1, 8n, 8n+1, ...) being coupled to one or more concentrating units (10n-1, 10n, 10n+1, ...) adapted to separate the permeate into a diluted fraction and a concentrate, each concentrating unit being provided with an exit (12n-1, 12n, 12n+1, ...) for the diluted fraction and a concentration exit pipe (14n-1, 14n, 14n+1, ...) for the concentrate, said concentration exit pipe being coupled to a return pipe (16n-1, 16n, 16n+1, ...) opening on to one or more of the feeding pipes (2n-1, 2n, 2n+1, ...) of the membrane filtration units.

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