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1. (WO2018156039) CENTRIFUGAL FILTRATION DEVICE AND METHOD FOR CONCENTRATING LIQUID MIXTURES

Pub. No.:    WO/2018/156039    International Application No.:    PCT/PT2018/050006
Publication Date: Fri Aug 31 01:59:59 CEST 2018 International Filing Date: Sat Feb 24 00:59:59 CET 2018
IPC: B01D 61/08
B01D 33/15
B01L 3/00
B01D 61/18
B01D 63/08
B01D 63/16
B04B 5/00
G01N 1/40
Applicants: INSTITUTO SUPERIOR TÉCNICO
Inventors: FERNANDES, Vitor Manuel Geraldes
DE ALMEIDA SEMIÃO, Viriato Sérgio
RODRIGUES, Miguel Ângelo Joaquim
DA SILVA COMPLETO, Carlos Duarte
Title: CENTRIFUGAL FILTRATION DEVICE AND METHOD FOR CONCENTRATING LIQUID MIXTURES
Abstract:
The present invention relates to a centrifugal filtration device and a method for concentrating, fractionating, purifying and/or desalinating small volumes of liquid samples, using reverse osmosis, nanofiltration or ultrafiltration membranes. The device comprises a shell, which comprises a sample chamber (102) with at least one ventilation orifice (123); a permeate chamber (106) with at least one ventilation orifice (145); a filtration chamber (104) with at least one semi-permeable membrane (105); a concentrate chamber (107) downstream of the filtration chamber (104); and at least one neck (103) connecting the sample chamber (102) to the filtration chamber (104) and the volume of which is less than the volume contained in the concentrate (107) and filtration (104) chambers. The device is particularly suited to performing nanofiltration or reverse osmosis on liquid samples with high osmotic pressures. Filtration takes place by means of the rotation of the centrifugal filtration device about a rotation shaft in a centrifuge. By using a long, narrow neck between the sample chamber, which is closer to the rotation shaft of the centrifuge, and the filtration chamber, which is further away from said rotation shaft, it is possible to maintain the pressure at high levels throughout the filtration process, which allows higher concentration factors to be achieved and the filtration time to be reduced.