DE1014409B - Method and device for cleaning rigid material using liquid, volatile, organic solvents - Google Patents

Description

The cleaning of rigid material, in particular made of metal, is carried out with the exception of an aqueous solution especially with volatile, organic solvents, especially with chlorinated hydrocarbons such as trichlorethylene, Perchlorethylene and the like. Open or closed devices are used for this in technology used, in which different demands are made, namely high performance on purified Objects, simple operation and, above all, low solvent losses. These conditions are largely fulfilled by the invention described below.

The method according to the invention for cleaning rigid material, preferably made of metal, by means of liquid, volatile, organic solvent, mainly Chlorinated hydrocarbons, such as trichlorethylene or perchlorethylene, in several steps, e.g. B. Loading with cleaning items and emptying, Filling with solvents, drying, etc., consists essentially in the fact that the operations are regulated in several movable treatment tanks in sequence by a control unit, which is actuated by rotating the treatment tank, which is moved horizontally in a circle. It will the cleaning liquid in a known manner into the treatment container from a arranged underneath Reservoir promoted by the pressure of solvent vapor. The displaced when filling the treatment tank with the cleaning liquid from them Air and the air used to dry the solvent-dampened items to be cleaned is used for Purpose of recovery of the solvent passed through a cooler to the outside.

The operation of the device is very simplified because of the method according to the invention they only ensure that the cleaning container is filled and emptied with the items to be cleaned which takes place in the same place, so that the worker does not have to leave their place. The remaining Operations such as pre-cleaning with an impure solvent, post-cleaning with a pure solvent and drying of the items to be cleaned are carried out completely automatically, simply by turning the star-shaped arranged treatment tank, whereby "the movement of the cleaning agent, the action the drying air, etc. is controlled.

To carry out the process, use is made of a device, one embodiment of which is in the is described below. On a stationary disk 1 is a rotatable disk 2, which three star-shaped arranged treatment container 3, 4 and 5 carries, which are mutually offset by 120 °. By turning the disk, each treatment container is put into the I, II and III be processes one after the other and device

for cleaning rigid material

by means of liquid, volatile, organic

Solvents

Applicant:

Wacker-Chemie GmbH,
Munich 22, Prinzregentenstr. 20th

Georg Edhofer, Munich,
has been named as the inventor

signed work positions. For each treatment container, two openings are provided in the rotatable disk, which are connected to the treatment containers. The lines 3 a, 4 α and 5 α are intended for liquid, the lines 3b, 4b and Sb for gases. The openings in the disk 2 correspond to the same ones in the lower disk 1, so that when the disk 2 is rotated through 120 °, the openings in the disk 2 are connected to those in disk 1.

The disk 1 has the following connecting lines: In working position I, the line 5 d leads to the open air, and the line 5 c leads to the cooler 9, which opens into a suction fan 8. In working position II, a line 3c goes to the solvent reservoir 6, which already contains some dirty solvent. The line 10 establishes the connection with the cooler 11, with the three-way valve 12 and via the line 17 with the steam generator 13.

In working position III there is also a connection with line 10, and line 4 c also emerges

into the solvent reservoir 7, which contains pure solvent. From the gas space of the solvent storage tank 6 and 7, a line 16 leads to the three-way valve 12, and there is also the storage container 6 through line 15 to the lower part of the solvent vapor generator 13 and the container 7 over Line 18 is connected to the cooler 11.

The device works as follows:

In working position I, the cleaning container 5 is filled with cleaning material and then closed. By Turning by 120 ° the cleaning container reaches working position II. The three-way valve 12 is set so that that the gas space of the solvent evaporator 13

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is connected to the gas space of the storage container 6 and 7 via the lines 14 and 16. As a result, the solvent is pressed out of the container 6 through the line 3 c and 3 α into the treatment container 3. After completion of the cleaning process, a connection between the line 16 and the cooler 11 is established by "turning the three-way tap 12. As a result, the solvent vapor flows out of the containers 6 and: 7 into ^: the cooler 11," where it is precipitated. The condensate flows back through the line 18 into the storage container 7. As a result of the release of the pressure, the cleaning liquid - can flow back out of the cleaning container 3 iff the storage container 6 ... .......

The same process also takes place in working position III, in which the cleaning container 4 is first fed with pure solvent from the container 7 through the lines 4 c and 4 α and then emptied again. The container 7 contains pure solvent, since the condensate from the coolers 11 and 9 flows into it via the lines 19 and 18. After rotating the cleaning container through 120 ° in working position I, the cleaning container is connected to the open air by lines 5 d and 5 b , and to the cooler 9 and suction fan 8 by lines 5 α and 5 c. The extracted solvent vapor is precipitated in the cooler 9. The condensate runs back into the storage container 7 via lines 19 and 18. The cleaning container 5 is then opened and the items to be cleaned are removed. It is then filled again with cleaning material, closed and brought into the working positions II, III and then back to I by turning it through 120 °.

The overflow from the container 6 is through the line 15 that collects in the line 10 Solvent fed through line 17 to evaporator 13.

Claims (8)

Claims ·. 1. Process for the continuous cleaning of rigid material using volatile, liquid, organic solvents in several steps, e.g. B. Loading by means of cleaning items and draining, filling with solvents, and draining and drying, whatever is required liquid solvents into the or the corresponding treatment container from an underlying one closed container is promoted by the pressure of solvent vapor, thereby characterized in that several arranged in a star shape on a disc-shaped rotary valve Cleaning container can be moved horizontally, in a circle and intermittently so that this during the standstill at the same time through the connection with the supply and discharge lines to the rotary valve producing the treatment agents - with these respective corresponding agents filled or emptied. 2. The method according to claim 1, characterized in that the filling of the cleaning container and the air used to dry the items to be cleaned for the purpose of recovery of the solvent is passed into the open via a cooler. 3. Device for performing the method according to claim 1 and 2, characterized in that that for the actuation of the operations two horizontal, concentrically sliding one on top of the other Discs are arranged with openings that match one another at regular intervals Gas or liquid lines open, with the lower disk (1) stationary and the upper (2) rotatable and is firmly connected to cleaning containers (3, 4 and 5) arranged in a star shape. 4. Apparatus according to claim 3, characterized in that that under the disc (1) two angeord ^ in an airtight container Nete solvent baths (6,7) are arranged ', each of which has two feed lines (3c, 3a and 4c, 4a) with two cleaning containers (3, 4) and through two lines (14,16) from the common gas space via a three-way valve (12) to the Are in connection with the vapor space of a solvent vapor generator (13). 5. Apparatus according to claim 3 and 4, characterized in that on the disc (2) the cleaning container (3, 4) via the lines (3 b or 4ö and 10) for cleaning the solvent-containing, from the containers (3.4 ) optionally displaced air are connected to the cooling device (11). 6. Apparatus according to claim 3 to 5, characterized in that a treatment container (5) via an open air supply (5 d, 5 b), through a line (5 a, 5 c) with a cooling device (9) and then with a suction fan (8) is connected. 7. Apparatus according to claim 3 to 6, characterized in that the reflux of the resulting The condensate is connected to the cooler (9 and 11) via the lines (19 and 18) with the container (7) are. 8. Apparatus according to claim 3 to 5, characterized in that for returning the overflow from the container (6) and the solvent collecting in the line (10) from the corresponding Connecting lines the lines (15 and 17) are connected to the evaporator (13) are. Considered publications:
German patent specification No. 479 389. 1 sheet of drawings © 709 658/374 8.57