Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1986-11-19
1989-04-11
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210670, 210691, 210692, 2105021, 426422, 426423, 426490, B01D 1500
Patent
active
048204200
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process for secondary purification and stabilization of liquids containing polyphenols and/or proteins, particulary beverages and more especially beer.
The centrifugation of liquids, especially beverages, has been known and practiced to a great extent to separate components from the liquid that have become insoluble during the process. But this kind of solid-liquid separation can be used only when a density difference between the liquid and the solid is sufficiently great and the substance to be separated has a starting stable texture that does not disintegrate as result of the high shearing stresses appearing in the centrifugation, that is, for instance, particles having colloidal structures result.
However, the turbidities present in the beer as agglomerates of polyphenol and protein have the property of easily disintegrating into particles of colloidal structure during the centrifugation so that they can be removed only to an insufficient extent by centrifugation. When the beer is stored after the centrifugation, these disintegrated agglomerates again form and cloud the beer.
The use of a centrifuge has been tested for purifying beer since it would make possible a very economic purification, but in the practice it could not succeed for the reasons mentioned above.
Another kind of primary purification of the beer that is generally carried out consists of continuously treating the clouded beer ready for bottling with filter means such as kieselguhr, perlites, cellulose and the like, and separating the filter means in a filter utensil in which a corresponding cake builds up. The disadvantage here is that the filter means cannot be regenerated, accumulates as waste, and to a great extent burden the deposits. Besides, it is important to note that different kinds of kieselguhr contain portions of christobalite which is harmful to health.
Therefore, kieselguhr filters (alluvial filters) require disposable filter means for their use. They have a relatively elevated need of water and additionally burden the waste water with beer-water mixtures and kieselguhr residues. The consumed kieselguhr slurries pose another problem due to the bad smell during transportation and sedimentation of the deposits. Therefore, a solution has been sought for years to find a way in order to eliminate as far as possible kieselguhr filtration. But hitherto, all efforts have been unsuccessful.
A stabilization of the beer by adding stabilization means adsorbent of polyphenols such as polyvinyl polypyrrolidone (PVPP), for instance "Polyclar AT" (see DE-OS No. 15 17 874), in combination with stabilization means adsorbent of proteins, such as hydrogel, has been known and carried out after the purification step. In particular, the costly PVPP can be regenerated by adding tempered lye solutions which can dissolve and thereby selectively remove both the hydrogels and the adsorbed proteins and polyphenols (DE-OS No. 26 48 978, H. Schafft, in "Brewery Industry", Number 4, 1979, Dr. Hums "Monthly Publications for Breweries", No. 34, p. 83 to p. 85, 1981). It is also usual (see DE-OS No. 19 07 610) to employ filter means and stabilization means together in a throw-away operation.
According to the invention, it has now been surprisingly found that it is economically possible to use a centrifuge for the purification of beer when beer that has undergone primary purification with the centrifuge is then treated with stabilization means and filter means.
Therefore, in a recycling process for combining the secondary purification and the stabilization of liquids containing polyphenols and/or proteins according to the invention, especially beer, wine, or similar beverages, the liquid to be treated is first subjected to primary purification with a centifuge. The centrifuged product, mixed with a mixture of stabilization adsorbent means of polyphenols and proteins and filter means that retain fine turbidities, is then transferred as suspension to an apparatus adequate for retaining solids. The solid cake that forms in the solids ret
REFERENCES:
patent: 3867551 (1975-02-01), Jaegle
patent: 3940498 (1976-02-01), Butterworth et al.
patent: 4490399 (1984-12-01), Weetall
Hums Norbert
Schafft Helmut
Cintins Ivars
Westfalia Separator AG
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