Process for the reduction in size of the pores of a filter mediu

Details Process for the reduction in size of the pores of a filter mediu Process for the reduction in size of the pores of a filter mediu

1989-01-18

1991-04-16

Silverman, Stanley

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210728, 210735, 210778, 210805, 210806, 426423, 426495, 4263304, B01D 3702

Patent

active

050080180

ABSTRACT:
The invention relates to a process for the reduction in size of the pores of a filter medium for beverages, preferably beer. Silica sol is added to the beverage to be filtered. In order to be able to reduce the size of the pores of the filter medium in a simple manner and to adjust it to the requirements, upstream of the filter medium through which passes the beverage, silica sol is added continuously or in a batch-feed process using a tank, in such a quantity and controlled such that the silicic-acid precipitation, i.e. the transition from SiO.sub.2 primary particles to SiO.sub.2 secondary particles, has taken place before the beverage has left the filter medium. The resultant silicic-acid precipitation reduces the size of the pores without sealing them.

REFERENCES:
patent: H89 (1986-07-01), Harville et al.
patent: 1426596 (1922-08-01), Peck
patent: 2573406 (1951-10-01), Clough et al.
patent: 3903316 (1975-09-01), Hoover
patent: 3993712 (1976-11-01), Guilbault
patent: 4027046 (1977-05-01), Bohm et al.
patent: 4457900 (1984-07-01), Steenken
patent: 4631193 (1986-12-01), Sobus

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