Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1994-09-23
1996-10-01
Fortuna, Ana
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210650, 210636, 2103331, 21033301, 210108, B01D 6100, B01D 6502
Patent
active
055608280
ABSTRACT:
The invention relates to a process for the removal of components causing turbidity, from a fluid, by means of microfiltration, whereby the fluid is beer, wine, fruit juice, bacterial suspension, blood, milk, enzyme suspension, etc. According to the invention, the fluid to be treated is fed across an asymmetric membrane having a pore structure such that the pores on the feed side of the membrane are larger than the nominal pore size and the pores of nominal pore size occur in the cross section toward the permeate side, the filtered off components are back-flushed from the membrane and are subsequently carried away with the fluid. The nominal pore size is usually 0.1-5.0 .mu.m and preferably 0.2-1.0 .mu.m. The membrane may be tubular, flat or capillary. Back-flushing takes place intermittently with a frequency of 1 second to 10 minutes for 0.1-1 second at a counter pressure of 0.5-5 bar. The feed velocity is preferably below 2 m/s and the pressure difference over the membrane is less than 0.5 bar.
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Jonsson Gunnar
Koenhen Dirk M.
Rasmussen Alan
Roesink Hendrik D. W.
Wenten Gede
Fortuna Ana
X-Flow B.V.
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