DE1062185B - Method for sterilizing liquids and disc centrifuge for use in the method - Google Patents

Description

GERMAN

JO /

KL .:

INTERNAT. KL. B 04 b

PATENT OFFICE. ,,,

W 20759III / 82 b

REGISTRATION DAY: MARCH 11, 19 5 7

NOTICE THE REGISTRATION AND ISSUE OF THE EDITORIAL: JULY 23, 1959

The disinfection of liquids is particularly important in the food and beverage industry Meaning. The purpose of the disinfection measures is to keep the number of germs intended for human consumption Reduce drinks to such an extent that health-damaging effects are excluded. Simultaneously the shelf life of the drinks, z. B. of fruit and Plant seeds, milk and the like, significantly increased.

According to a known method, the liquid to be sterilized is heated to paste curation temperature heated and then in a high-speed centrifuge with a centrifugal force of about Centrifuged 30,000 g.

A disadvantage of this process is that some of the vitamins are due to the previous pasteurization as well as the flavors and fragrances are destroyed, thereby impairing the natural character of the drink will. Another disadvantage is that with high-speed centrifuges, because of their high angular velocity preferably as tellcrlosc Tubular centrifuges are designed with relatively small diameters, the separation force with increasing Deposition of solids decreases very quickly. It is also for the smaller and lighter ones Solid particles also a centrifugal acceleration of 30,000 g is not sufficient to during the short Dwell time in the drum to be able to cover the way to the inner wall of the drum. Self a multiple extension of the dwell time by reducing the throughput would not be necessary lead to a complete throwing off of all solid particles, apart from the fact that in such a Performance the use of a centrifuge would no longer be economical.

The aim of the invention is to remedy the above-mentioned disadvantages by heating the liquid to be treated but not pasteurizing it, subjecting the preheated liquid to the action of centrifugal force in a cleaning centrifuge with a plate insert and from the space between the plate insert and the inner wall of the drum finer solids and liquid enriched with MikrolKui is withdrawn continuously or periodically. This liquid contains the finer and lighter germ carriers, e.g. B. also suspended particles that require a very long dwell time to cover the way to the inner wall of the drum. By discharge of this fluid is prevented that the keinmbeladene liquid ring in the disc stack grows $ ° and is entrained by the inward flow. The amount of this liquid fraction can be regulated so that the loss of useful liquid is only slight. There is, however, the method for sterilizing

of liquids

and disc centrifuge for use in the process

Applicant:

Westfalia Separator A. G., Oelde (Westf.)

Dr. Wilhelm Wilsmann and Karl Meis,

Oelde (Westf.), Have been named as inventors

Possibility of later making this portion of the liquid germ-free by heating it up or in some other way make and put to further use. Since the pressure difference between the cleaned and the highly germ-containing liquid is very small, can also with free exit from the drum fog formation does not occur.

The system for carrying out the disinfection is in place from a heater in which the centrifugal nuts is heated, and a cleaning centrifuge with a plate insert, which is connected immediately after the heater is. The liquid treated in the centrifuge can optionally after its exit from the The drum must be immediately cooled down to storage temperature.

The disc centrifuge according to the invention is essentially characterized in that for discharge a peeling disk or one tightly connected to the centrifugal drum Line and a throttle device is provided in this discharge line, while the discharge of the strongly germ-containing Liquid takes place via a free transition edge, which is practically at the same radial distance from the The drum axis lies like the free liquid level in the peeling chamber with foam-free discharge or like the radially inner fluid limitation in the hermetically sealed drain. Because the difference between the specific gravity of the purified and kcim-containing liquid is very low, During normal operation, the liquid level of the highly germ-containing liquid is close to the overflow edge reach out. By throttling the flow

909 578/156

for the purified liquid can be the liquid level shifted inwards and more or less germ-containing liquid pressed out of the drum will. This throttling can be set either test or at predetermined time intervals can be carried out manually or automatically. It is also possible to drain the highly germ-laden Controlling the amount of liquid by regulating the inflow. Of course you can also the highly germ-containing liquid content by means of a paring disc or a hermetic discharge and in this discharge also * a Throttle body are provided.

Another feature of the invention is that the space outside the plate insert with the drain for the highly germ-containing liquid is connected by individual channels, the cross-section of which is so dimensioned is that despite the small amount of liquid removed, high flow velocities arise and thereby prevent deposits of solids in the channels. To this end the drum can be equipped with a massive separating plate protruding over the outer edge of the plate his, which is provided on the top with grooves that form such channels with the drum cover; however, holes or tubes can also be arranged in the drum cover. It may be It is advisable to lengthen these tubes and bend them so that they are parallel outside the plate package run to the drum axis and extend to the drum base. The axially directed part is then to be provided with inlet openings for the germ-containing liquid, which are preferably arranged on the outside in order to avoid clogging by the solids migrating outwards.

The drawing shows two exemplary embodiments of the centrifuge according to the invention with a free outlet the germ-containing liquid shown, namely Fig. 1 shows a drum with the derivation of the sterilized Liquid through a peeling disk and

2 shows a drum with a tightly connected discharge line for the sterilized liquid portion.

In the case of the centrifugal drum according to FIG. 1, the material to be centrifuged flows from the feed vessel 1 through the feed pipe 2 into the inlet frame 3 of the centrifugal drum and from there through the riser channels 4 into the Space between the insert plate 6. The heavier and larger solids are deposited on the inner wall of the drum 7 from. The cleaned liquid passes through channels 8 in the peeling chamber 9 and is through the peeling channels 10 and the discharge line 11 are discharged. The one in the annular space 12 between the inner wall of the Tromrael and outer edge forming with finer solid particles and bacteria-enriched suspension is directed through holes 13 in the drum cover to the drum acb.se and gets through holes 14 into the collecting vessel. The step edge 15 is approximately at the same radial distance from the drum axis as the liquid level 16 in the peeling chamber 9. The bore 17 is used to vent the inlet space. With the help of the throttle organ 18, the liquid level 16 in the peeling chamber 9 and in the annular space 19 can be shifted, so that over the step edge 15 a more or less large amount of germ-containing liquid can be drained from the drum.

In the case of the centrifugal drum according to FIG. 2, the liquid to be cleaned and sterilized passes through a supply line tightly connected to the rotating drum into the separation space. The separation of the Liquid proportions are carried out in the same way as with the centrifugal drum according to FIG. 1. The sterilized Part of the liquid flows through channels. 19 α in the annular chamber 20 and leaves the centrifuge through the Drainage 21. For the drainage of the highly germ-containing liquid portion, tubes 22 are in the Drum cover or below the drum cover arranged, which are angled outside of the plate assembly and axially parallel to the drum base

ίο run away. Between the inner wall of the drum and Liquid enriched with finer solid particles and bacteria occurs outside the rim enters the tubes 22 through bores 23 and passes through the annular channel 24 into the annular chamber 25 and is discharged through the discharge pipe 26. The. The amount of this liquid content can be adjusted with the help of the Throttle member 27 can be adjusted. For the derivation, in the case of the drum according to FIG. 1, a second peeling disk and in the drum according to FIG. 2

ao a second, hermetically connected to the drum Derivation can be provided. In the latter case, a throttle device must also be arranged in the discharge.

Claims (7)

Patent claims: 1. Procedure for disinfecting liquids by means of a cleaning centrifuge with a plate insert, characterized in that from the previously heated material to be centrifuged from the zone outside the bowl insert via a free liquid drain liquid enriched with bacteria is discharged. 2. The method according to claim 1, characterized in that the quantity control of the bacteria enriched liquid content by means of a throttle device in the discharge of the cleaned Liquid occurs. 3. Disc centrifuge for use in the method according to claim 1 or 2, characterized by a peeling chamber with peeling disk arranged on the drum head for the derivation of the cleaned and a free drain for the highly germ-containing liquid component, its overflow is approximately at the same radial distance in front of the drum axis as the free liquid surface in the peeling chamber with foam-free drainage of the sterilized liquid. 4. Expensive centrifuge for use with the Process according to Claim 1 or 2, characterized in that the purified and the highly germ-containing liquid is carried out by means of peeling discs, the inlet opening for the highly germ-containing liquid in the peeling chamber practically at the same distance from the Like the free surface of the liquid, the drum axis lies in the peeling chamber for the cleaned one Liquid with foam-free drainage. 5. TeUerzentrifuge for use in the method according to claim 1 or 2, characterized by a discharge pipe which is tightly connected to the rotating drum and provided with a throttle element for the cleaned and a free drainage for the strongly germ-containing liquid part, whose overflow edge is approximately at the same radial distance from the drum axis as the radially inner fluid limitation in the hermetically sealed drain. 6. TeUerzentrifuge for use in the method according to claim 1 or 2, characterized in that that the derivation of the purified and the highly germ-containing liquid by being tightly connected to and with the rotating drum Discharges each provided with a throttle device takes place. 7. Disc centrifuge according to claim 3, 4, 5 or 6, characterized in that the space between the inner boundary of the deposited sludge ring and the outer limit of the plate insert connected to the drain for the germ-containing liquid through channels or tubes is. Considered publications:
German patent specifications No. 659 724, 855 938. 1 sheet of drawings