DE1275033B - Filters, especially for raw drinking fluids, made of foam - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN mftfm PATENTAMT Int. CL:

BOId

EDITORIAL

German class: 12d-19

Number: 1275 033

File number: P 12 75 033.3-27 (K 50607)

Filing date: August 22, 1963

Opening day: August 14, 1968

The invention relates to a filter, in particular for raw drinking liquid, with a tubular or plate-like shape Filter elements made of foam in a container provided with proppants.

Sometimes it is difficult to get rid of bothersome solids in brewing liquid, liquid seasoning, soy sauce, raw fruit juice are included to filter. So far, mostly filter presses or centrifugal separators have been used used for this purpose. However, working with these separation devices is based on equipment laborious. In addition, it can still be difficult to obtain a filtrate with devices of this type to achieve good quality. It is also known to use synthetic foam, among other things, for air or Use liquid filtration. The known foams can have different pore sizes exhibit. One of the known filter bodies of this type consists of several concentric, different ones Hollow cylinders or plates made of foam with pore size. The me- ao to be filtered Medium is sucked or pressed through the foam layer structure.

The invention is based on the problem of solids from liquids which are difficult to filter and with good filtration performance in a filter with a relatively large surface area of the filter material made of foam and with temporary backwashing of solids without interrupting the filtration period.

The invention solves this problem in that each cylinder, adjacent to the filtrate side, in a flat bed of foam, which is arranged on the reticulated support means, embedded and at least in this area is solid and from the opposite side a vertical one Gas inlet line is passed through substantially the entire cylinder.

The filter according to the invention is distinguished by simple filters compared to the filters previously used and easy to manufacture construction using commercially available foam as well as through a simple mode of operation. The filter is well suited for gravity filtration. Another advantage consists in the high filtration performance at low overpressure.

The invention is now explained using an exemplary embodiment in the drawing. It shows

F i g. 1 is a side view of the filter placed in a sealed container and FIG

F i g. 2 is a schematic view of a foam cylinder with a foam bed. >

In these drawings, 1 is a closed container, 2 is an inlet for the liquid to be filtered, filters, in particular for raw drinking liquid,
made of foam

Applicant:

Kyowa Hakko Kogyo Co., Ltd., Tokyo

Representative:

Dr.-Ing. H. Ruschke

and Dipl.-Ing. H. Agular, patent attorneys,

8000 Munich 27, Pienzenauer Str. 2

Named as inventor:

Mikio Kato,

Kokichi Sato,

Iwaki Oide, Amimachi, Inashiki-gun,

Ibaragi-ken (Japan)

Claimed priority:

Japan August 25, 1962 (35 152)

3 a multitude of elastic, permeable foam cylinders in which vertical branches of the Gas injection lines 4 are arranged, 5 is an elastic, permeable foam bed, 6 is a Stainless steel wire mesh, 7 is an outlet for the filtrate, 8 is an opening for removal of the deposited material and 9 is a gas inlet.

During the filtration, the liquid to be filtered is through the line 2 into the container 1 introduced, and a valve at outlet 7 is slowly opened. In the beginning the filtrate is during a little cloudy for a short time and is therefore generally returned to the container. As soon as it becomes clear runs, it is collected in a receptacle. The liquid is in the elastic foam absorbed by capillary attraction and flows slightly downwards due to gravity, the Filtration speed becomes very large. The troublesome solids settle on the surface of the permeable elastic foam and then serve in a known manner as a filter aid. if As the filtration proceeds and the liquid level decreases, new liquid is added. if As the rate of filtration decreases, air or carbon dioxide will pass through a number of holes which are bored over the entire surface of the gas inlet pipe 4. The gas flow dissolves

809 590/385

precipitation from the foam surface, increasing the filtration period can. The gas cushion can after blowing back z. B. be vented via the nozzle 2. After completion the sludge precipitate is removed through the opening 8 during the filtration.

The following examples show the good filtration performance of the filter according to the invention. In all examples the filter area (= bed + cylinder) is 5.15 m ² .

example 1

A seasoning liquid is filtered. The material of the filter medium is odorless polyurethane foam. The result of the filtration is shown in the following table.

Table 1

Time (min.)

Filtrate (1)

Total quantity (1)

Filtration speed (l / min.)

30th 90 150 270 420 510 630 926 530 353 510 480 255 310 926 1456 1809 2319 2799 3054 3364 30.8 8.8 5.9 4.3 3.2 2.8 2.6

1050 466 3824 0.9

Example 2

The seasoning liquid is then filtered under a pressure of 0.2 kp / cm ² (carbon dioxide). The device is the same as in Example 1. The result is shown in Table 2.

Table 2

Time (min.)

Filtrate (1)

Total quantity (1)

Filtration speed (l / min.)

30th 90 150 270 420 510 1883 609 409 576 523 277 1883 1692 2101 2677 3200 3477 36.1 10.1 6.8 4.7 3.4 3.0

840 374 3851 1.1

Example 3

Sugared liquid is used for filtration. The experimental design is selected as in Example 1. The result is shown in Table 3.

Table 3

Time (min.)

Filtrate (1)

Total amount (1) .. Filtration speed (l / min.) ....

10

63.0

63.0

6.3

40 87.5 150.5

5.0

100 98.5 249.0

4.2

220

102.6

351.6

3.0

Example 4

Sugared malt liquid is used for filtration. The experimental design is selected as in Example 1. The result is shown in Table 4.

Table 4

Time (min.)

Filtrate (1)

Total amount (1) .. Filtration speed (l / min.) ....

15th

1048 1048

70.0

45 180 1228

6.0

75

190

1418

6.3

105 50

1468

Example 5

To compare the filtering speed of different materials as filter medium, the filtration of seasoning liquid was carried out using a flat filter bed of 5.15 m ² .

Tabel 5 20th 30th 40 40 time (min.) 10 Odorless poly 6.1 4.8 3.5 urethane foam .. 11.8 1.0 0.6 0.5 Nylon filter cloth .... 1.7 Wire mesh with a 45 clear meshes width of 0.8 mm 0.5 0.4 0.3 (20 mesh) 1.4 0.4 0.3 0.2 Filter paper No. 2 1.0

When the polyurethane foam is arranged in the manner according to the invention, the rate of filtration will be far above that of the flat filter bed above.

1.7

Example 6

The filtration of summer orange juice is carried out according to Example 1 using elastic polyvinyl chloride foam carried out in place of the polyurethane foam. The result is shown in Table 6.

Table 6 15th 30th 45 60 75 1020 695 482 405 323 1020 1715 2197 2602 2925 68.0 46.3 32.1 27.0 21.5

Time (min.)

Filtrate (l)

Total quantity (1)

Filtration rate (l / min) 105 242 3167 16.1

Claims (1)

Claim: Filters, in particular for raw drinking liquid, with tubular or plate-shaped filter elements made of foam in a container provided with proppants, characterized in that that each cylinder (3), adjacent to the filtrate side, in a flat bed (5) made of foam, which is arranged on the net-shaped support means (6), let in and at least in this area is solid and from the opposite side a vertical gas inlet line (4) is guided through substantially the entire cylinder. Considered publications: German patents No. 918 027, 971481, 1091323;
German utility model No. 1708 009, 1847 028. 1 sheet of drawings 809 590/385 8.68 ® Bundesdruckerei Berlin