Liquid purification or separation – Processes – Separating
Patent
1994-02-07
1995-08-29
Dawson, Robert A.
Liquid purification or separation
Processes
Separating
210193, 210143, 210204, 210230, 210231, 210284, 210335, 210807, B01D 3702
Patent
active
054457459
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY
The present invention refers to a filtering method for filtering liquids, especially beverages, and a filter device for carrying out this method with the features according to the generic clauses of claim 1.
Such a filtering method is known in practice. It is especially used for sterile filtration in the beverage industry. When beer is being filtered, yeast cells and bacteria can be held back without preventing fine substances, which are responsible for the taste, from flowing through. Such a filtering method and such a filter device are known e.g. from EP-A-368 076.
In the case of this method, the filters are produced in a station outside of the filtering station. Subsequently, one filter at a time is inserted between two filter holders provided in the filtering station. The filter bowls with the filters are stacked up in the filtering station. This method is disadvantageous insofar as the filters have to have a high inherent stability so as to permit the transport of the filters into the filter bowls. For this purpose, a binding agent is admixed to the filter raw material. In view of the fact that such a binding agent contains sugar, its use has the disadvantage that sugar may penetrate into the liquid to be filtered. This can be prevented to a large extent by flushing the filtering station with water prior to starting the filtering process so as to dissolve the binding agent out of the filters. This may, however, have the effect that the height of the filters shrinks by approx. 1/3 at the most. This shrinkage will cause sealing problems in the filter device, and these sealing problems can only be solved by the use of special sealing means for sealing the filters in the filtering station. This makes the device complicated and expensive.
DE-A-39 00 934 discloses a filter device into which filters, which are produced without any binding agent, are inserted. The filters are produced in the filtering station itself by precoating with filter aids. The filter aid is, prior to starting the filtration process, supplied via a common supply line for precoating onto the individual filter holders, which are arranged one on top of the other in a towerlike configuration, so that the individual filters will be formed on said filter holders. When the filtering process has been finished, the filters will be washed out of the device by means of an appropriate rinsing agent.
This method is disadvantageous insofar as the structural design of the filter device is big and complicated because the filter aid is supplied via a common line for producing all filters in common. Hence, the supply line provided must have a sufficiently large diameter. Moreover, it is impossible to check the formation of the individual filters and their uniformity independently and exactly and to change it, if necessary. The fact that the filter aid is supplied via a common line and distributed over all filter carriers may result in an non-uniform formation of the filters. In view of the fact that the filters are not pressed, such non-uniformity will not be levelled out.
With respect to this prior art, it is the object of the present invention to provide an improved and simultaneously simplified filtering method and filter device for filtering liquids without exerting any negative influence on the quality of the filtrate.
In accordance with the present invention, this object is achieved by a filtering method having the features of claim 1.
In view of the fact that each filter is produced by precoating the filter aid onto a filter carrier in a precoating station, i.e. it is produced outside of the filtering station, the production of each individual filter can be supervised and controlled individually. This will guarantee the uniformity of the filters. The fact that production of the filters takes place in a precoating station also permits a simple structural design of the filter station, since it is not necessary to provide there any additional big channel for supplying the filter aid. It follows that it will suffice when the f
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Dawson Robert A.
Popovics Robert James
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