JPS6031523B2 - Mixed oil removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus that can efficiently remove mixed oils such as hydraulic oil and lubricating oil from an aqueous solution.

Aqueous solutions of water-soluble cutting fluids used for grinding and cutting various materials such as steel are used repeatedly.

During this repeated use, oil such as hydraulic oil or lubricating oil used in grinding machines and cutting machines gets mixed into the aqueous solution and accumulates therein. When the amount of these mixed oils increases, the stable dispersion state of the cutting fluid in water becomes unstable, making it easier for the fluid itself to separate from the water.
Alternatively, it may accelerate the decay of the aqueous solution, resulting in a decrease in cutting and grinding performance. Therefore, it is necessary to remove such mixed oil from the aqueous solution as much as possible. Conventionally, one of the oil/water chick technologies is a device called a coalescer, which pumps an oil-containing aqueous solution into a layer filled with fibers such as polymer fibers and glass fibers, coalesces fine oil droplets to coarsen them, and removes the oil. There is.

However, a drawback of this device is that fine particles mixed in the oil-containing aqueous solution are trapped between the fibers, causing clogging. Therefore, oil-water separation becomes insufficient or impossible, and additional equipment such as a high-pressure pump for backwashing the fiber layer is required. The present invention aims to overcome the drawbacks of such conventional devices and provide a device that can efficiently remove contaminated oil.

That is, the present invention provides a device for removing mixed oil such as hydraulic oil and lubricating oil mixed in water in an unstable state, with a diameter of 0.5 mm, the surface of which is coated with an organic silicon compound.
A first layer filled with a large number of spherical bodies on the 6.7 side and a second layer filled with a large number of columnar bodies whose surface is coated with an organic silicon compound are provided, and the above-mentioned mixture is formed. A device for removing mixed oil, characterized in that water containing oil passes through the second layer along the axial direction of the columnar body after passing through the first layer.

Therefore, according to the present invention, the oil that has entered the water can be efficiently and easily removed.

In particular, when the present invention is used to remove mixed oil mixed into the aqueous solution of the water-soluble cutting fluid, the mixed oil can be removed without changing the cutting and grinding performance of the cutting fluid solution itself. At the same time, fine cutting powder and grinding powder mixed into the aqueous solution can be removed at the same time. In addition, since the mixed oil can be efficiently removed in this way, the cutting fluid itself can maintain a stable dispersion state in water and will not deteriorate, resulting in excellent cutting and grinding performance. can be maintained for a long period of time. Note that when this device is used, only the mixed oil is removed, but the water-soluble cutting fluid itself is not removed, and therefore the performance of the aqueous solution of the fluid is not degraded. The efficient removal of mixed oil as described above is thought to be due to the following reasons.

First, the first layer of the filling in the present invention is characterized by its surface being a spherical surface, and this spherical surface provides the following effects of the first layer. . If the surface of the filler is not spherical but angular or has many irregularities, the effects of the present invention cannot be obtained. This is because if the surface is not spherical, the spaces between the fillers will be occupied by the corners and protrusions mentioned above, and the flow of the liquid will be extremely poor.
This is thought to be because clogging is likely to occur due to solids mixed in the liquid. (See Comparative Experimental Example) In addition, since the diameter of the spherical bodies in the first layer is 0.5 mm and 6.7 ribs, clogging of the first layer is unlikely to occur, and the aqueous solution and filler are not easily clogged. Sufficient contact occurs, making it easy to effectively coarsen oil droplets.

That is, in the present invention, the surface of the spherical bodies such as glass beads filled in the first layer is coated with an organic silicon compound to make the surface of the spherical body lipophilic and improve wettability with oil droplets. ing. Further, since the first layer is filled with a large number of spherical bodies, the free space between the spherical bodies is relatively large, there is no uneven distribution of channels, and there is no clogging caused by fine powder. Therefore, due to the increased lipophilicity of the surface of the spherical bodies coated with an organic silicon compound coating and the intersecting flow paths like a labyrinth between the spherical bodies, the number of mutual collisions of the oil droplets of the mixed oil increases. The coarsening of the oil droplets of the mixed oil is promoted. However, these coarse oil droplets have not yet grown large enough to float in the aqueous solution, and are only dispersed and moved in the aqueous solution. Therefore, in the present invention, the aqueous solution that has passed through the first layer is further fed into a second layer filled with a large number of columnar bodies coated with an organic silicon compound, and the aqueous solution is directed in the direction of the columnar bodies. This laminar flow and the lipophilic effect of the organic silicon compound coating further coalesce the oil droplets that have become coarse to some extent in the first layer. This promotes the enlargement of the oil droplets.

The oil droplets of the mixed oil in the aqueous solution that have passed through the second layer have a particle size (approximately 0.1 rib or more) sufficient to float in the aqueous solution, and have a size that can be easily dispersed and removed from the aqueous solution. The oil droplets thus floated on top of the aqueous solution are removed by known means such as a scraper. In the present invention,
The spherical bodies to be filled in the first layer refer to spherical bodies such as glass beads, and the diameter is 0.5 to 6.7 (32
None, 3 mesh) are preferred.

Compared to this, a spherical body is more likely to clog, and the flow resistance of the aqueous solution passing through the first layer is greater.
Not practical. Furthermore, if a diameter larger than this is used, the contact between the aqueous solution and the organosilicon compound film-forming spherical bodies will not be sufficient, making it difficult for oil droplets to become coarse. The above-mentioned "formation of an organic silicon compound film" refers to forming a film of an organic silicon compound such as silane, organosilane, organosiloxane, etc. on the surface of the spherical body. Formation of such an organic silicon compound film is carried out by immersing the above-mentioned spherical body in a solution in which a silicon compound such as methylhydrogenpolysiloxane is dissolved, and then taking out the spherical body, drying it, and then heating it to a high temperature to form the above-mentioned spherical body. This is done by, for example, curing a silicon compound on a spherical body. Further, as the columnar body for filling the second layer, a rod or a tube made of glass, stainless steel, etc. is used.

Therefore, it is preferable that the outer cover of this columnar body is two or two ribs. If the diameter is smaller than this, the linear passage formed between the columnar bodies will be narrow, so the flow resistance will be large, and the aqueous solution will tend to flow turbulently, making it difficult to make the oil bottle coarse. Furthermore, if the diameter is larger than this, the contact between the aqueous solution and the organosilicon compound film-forming columnar body will be insufficient, making it difficult to make the oil bottle coarse.When using a tubular columnar body, the inner diameter should be 1. It is preferable to use one to two sides. Outside this range, it is difficult to coarsen the oil droplets. As the length of the columnar body increases, the oil droplets become coarser. The method for forming the organic silicon compound coating on the columnar bodies is the same as that for the spherical bodies described above. In the apparatus of the present invention, the average linear velocity of the aqueous solution passing through the apparatus is between 10° and 50°/
It is preferable to set it as 1 minute. The smaller the linear velocity is, the more coarse the oil droplets will be, but the processing speed of the aqueous solution will be lower, so the linear velocity is preferably 10 arc/min or more. If the speed is 50 min/min or more, the oil droplets will not become coarse enough.

Here, the average linear velocity refers to the "amount of liquid passing per minute" through the layer filled with the columnar or spherical bodies.
) is the internal cross-sectional area of the cylinder filled with the packed bed.
The value divided by (earth). This device can be used not only in an aqueous solution of a water-soluble cutting fluid and water as described above, or an emulsion of both, but also in an aqueous solution such as factory wastewater, or in general water. It exhibits the above-mentioned excellent effect in removing oil mixed in the state. In short, the present invention is applied to the removal of oil that is mixed in water in an unstable state. Examples of implementation of the present invention are shown below.

Example 1 A mixed oil removal device 1 according to the present invention as shown in FIG.
The mixed oil mixed in the aqueous solution of the water-soluble cutting fluid was removed using the following method.

As shown in FIG. 1, the above-mentioned mixed oil removal device 1 has a cylindrical main body 11 filled with a large number of organic silicon compound film-forming spheres 2 as a first layer below the main body 11, and above the main body 11. A large number of organic silicon compound coated columnar bodies 3 as a second layer are arranged in parallel along the ball direction of the main body 11.

Further, an inflow pipe 12 is provided on the first layer side of the main body 11, and the second
Outflow pipes 13 are connected to each layer side. Further, a space chamber 15 for promoting layer sulfurization is formed between the first layer and the second layer by wire meshes 18, 18. In addition, 14,
16 is a wire mesh. The main body 11 has an inner diameter 46 side, the length of the layer of the spherical body 2 is 5 mounds, and the length of the columnar body 3 is 30 m2. In addition, the length of the space chamber 15 is 2 mounds. The coated spherical bodies 2 were obtained by treating glass beads of 9 to 12 mesh (approximately 2 to 1.4 side) as follows. That is, a solution of 1% methylhydrogenpolysiloxane dissolved in n-hexane (volume ratio, the same unless otherwise specified) is prepared, the glass beads are immersed in the solution, and then the glass beads are taken out and dried. Then, this was soaked in an aminosilane alcohol solution, further taken out and dried at room temperature, and then heated to about 180 qo,
Obtained by curing. In addition, the above-mentioned coating-forming columnar body 3 forms an organic silicon compound coating on the inner and outer surfaces of the glass tube with the same striations as in the case of the above-mentioned spherical body 2 on a glass tube with an inner diameter of 3 willow and an outer diameter of 5 willow. It was obtained by doing. The above-mentioned water-soluble cutting fluid contains an emulsifying agent (mineral oil) 6
7%, surfactant 25%, preservatives, inhibitors, etc. 8%
The aqueous solution to be treated is an emulsion-type one consisting of a diluted water solution three times the shipboard capacity of the oil agent and mixed oil dispersed therein.

Therefore, the mixed oil in the aqueous solution to be treated is mixed with mechanical lubricating oil (Pactra No. 2; trade name, manufactured by Mobil Oil Co., Ltd.) and hydraulic oil (Dafter 140: trade name, manufactured by Idemitsu Kosan Co., Ltd.). The mixed oil is mixed in an equal amount, and the mixed oil is mixed in the aqueous solution to be treated at 6%, and is uniformly dispersed in the aqueous solution in an unstable emulsion state. The removal of the strained oil is carried out by introducing the aqueous solution to be treated into the inside of the mixed oil removal device 1, the space formed by the film-forming spherical bodies 2 of the first layer, the space chamber 15, and the film of the second layer. This was carried out by sequentially feeding into the linear void formed between the formed columnar bodies 3 and the inner hole of the glass tube 3 which is the columnar body 3.

In this example, the flow rate of the aqueous solution was varied, and the removal rate of mixed oil at each flow rate was measured. In addition, the above-mentioned removal device 1
was fixed at an angle of about 30 degrees so that the second layer was on top. The results are shown in Figure 2.
min) and linear velocity (m/min), and the vertical axis shows the mixed oil removal rate (
%) and is shown by curve a.

As can be seen from curve a in FIG. 2, it can be seen that the removal rate increases as the linear velocity decreases.

Also, for comparison, the figure also shows the first
The dashed line b shows the result when a layer consisting only of the film-forming spherical bodies 2 is used as a layer, and the dotted line c shows the result when a layer consisting only of the film-forming columnar bodies 3 as a second layer is used. show. As can be seen from the above, the apparatus according to the present invention exhibits a superior removal rate compared to the case where only the first layer or only the second layer is used.

Further, in the above example, it can be seen that the removal effect of the second layer only line c is greater than that of the first layer only line b. In addition, in the treatment by the removal device 1, only the mixed oil was removed;
There was no decrease in the water-soluble cutting fluid itself, and no change was observed in the cutting performance of the aqueous solution after the treatment. Example 2 The relationship between the linear velocity and the removal rate of mixed oil was measured in the same manner as in Example 1 using the same water-soluble cutting fluid aqueous solution as in Example 1 except that the amount of mixed oil was different.

The results are shown in Figure 3 for the same aircraft as in Figure 2 above.

Each curve in the figure is a value for an aqueous solution containing the amount of mixed oil shown in Table 1. As can be seen from Table 1 and Figure 3, it can be seen that the removal rate increases as the amount of mixed oil decreases.

Example 3 The removal rate of mixed oil was measured for oil-containing water made by mixing oil into tap water.

This shows that the mixed oil is dispersed in the tap water, and the amount of mixed oil is 2.
．． It is the same as Example 1 except that it is 5%. The above results are shown in FIG. 4 by curve h in the same manner as in FIG. 2.

Example 4 Organosilicon Compound Film Formation The removal rate of mixed oil was measured under the same conditions as in Example 1 except that the size of the glass beads used for the spherical bodies was varied.

The results are shown in FIG. 5 in the same manner as in FIG. In the figure, each curve is a value for the glass bead size shown in Table 2.

As is known from Table 2 and FIG. 5, it can be seen that the spherical bodies of any size shown in Table 2 exhibit approximately the same level of mixed oil removal rate.

Example 5 The removal rate of mixed oil was measured in the same manner as in Example 1 except that the length of the glass tube used for the organosilicon compound coating columnar body was varied and the linear velocity was 30 skin/min.

The results are shown in FIG. 6 as a straight line 1, with the horizontal axis representing the length (fence) of the glass tube on which the organic silicon compound coating was formed, and the vertical axis representing the removal rate of mixed oil. As can be seen from the same figure,
It can be seen that as the length of the glass tube increases, the infiltrated oil removal rate increases.

Example 6 In this example, as shown in the flow sheet of Fig. 7, the present invention is applied to a circulation line for an aqueous cutting fluid solution used for cutting steel materials. This shows an example in which mixed oil is continuously removed and the above oil agent is used continuously.

That is, the oily and moisture-covered layer shown in FIG.
42, . Four mixed oil removal devices 1 according to the present invention for removing oil, a separation tank 6 for storing the treated aqueous solution 61 treated by the removal device 1, and a separation tank 6 for separating the mixed oil by the separation tank 6. It consists of an oil tank 7 for storing an aqueous water-soluble cutting oil solution 63, and a mixed oil tank 8 for storing the permeated oil 62 separated in the separation tank 6.

Therefore, when the mixed oil 62 is removed by this oil/water separator, the mixed oil 62 is discharged from the cutting machine group 4 and removed.
The aqueous solution 51 containing 2 is temporarily stored in the reservoir tank 5 through the pipe 46, and then the aqueous solution 51 is transferred to the buffer tank 53, valve 54, and flow meter 55 for removing pulsation of liquid supply by the pump 52. The mixed oil is sent to four mixed oil removal devices 1 through the oil filter.

In the removal device 1, the mixed oil 62 is coarsened and separated from the aqueous solution 63, and the treated liquid 61 consisting of both is discharged into the separation tank 6. In the separation tank 6, the coarse-grained mixed oil 62 in the treated liquid 61 floats above the tank, and the mixed oil 62 flows down from the oil outlet 66 through the pipe 67 into the mixed oil tank 8. . On the other hand, the aqueous solution 63 from which the mixed oil in the separation tank 6 has been removed is removed by the partition plate 60.
The solution flows out to the aqueous solution outlet 64 through the pipe 65, valve 68, and pipe 651 to the oil tank 7.
In this case, the aqueous solution 63 sent to the tank can be returned in whole or in part to the reservoir tank 5 via the valve 69 and pipe 652, depending on the need for processing by the removal device 1 again. As described above, cutting machine group 4
The aqueous solution 63 of water-repellent cutting fluid used by and from which turbidity has been removed is sent to the cutting machine group 4 again by a pump 71 and a pipe 72, and is sent to each cutting machine 41, 43, . . .
...Distributed to 45 people and used.

The aqueous solution 63 is recycled as described above.

In the above-mentioned oil/water chick device, the inventors used the same device as shown in Example 1 as the mixed oil removal device 1, and set the linear speed of each removal device 1 to 30 skins/min (generally). The water-soluble cutting fluid aqueous solution 51 containing the above-mentioned mixed oil was treated.

Here, the water-dropping cutting fluid was the same as in Example 1, and the mixed oil was the same as in Example 1, and was contained in the aqueous solution 51 at about 5%. As a result, the amount of mixed oil in the aqueous solution 63 after removing the mixed oil is approximately 0.7.
Only % existed.

This corresponds to a mixed oil removal rate of 86%. In addition, a small amount of fine cutting powder (approximately 50 grains) is contained in the aqueous solution 51 before treatment.
However, their presence did not cause any problems such as clogging of the removing device. Further, the aqueous solution 63 after removing the mixed oil was repeatedly used for cutting, and its good performance was maintained. Comparative Experimental Example In the same manner as in Example 1, a glass sphere whose surface was coated with an organic silicon compound and crushed glass particles were used, and each of them was filled into a cylinder with a length of about 5 square meters. death,
A liquid containing oil and solid matter was passed through the packed bed, and the clogging status in each packed bed was measured.

Both the above-mentioned spherical bodies and crushed particles had a mesh size of 24 mm and 32 mm (0.7 to 0.5 ribs in diameter).

The crushed grains are obtained by crushing glass and dividing it into segments. .
The liquid contained 2% oil (by volume), 100 particles of kaolin powder (particle size approximately 1 French) as a solid content, and the remainder water. In addition, the apparent flow velocity of the liquid in the packed bed is 30
It was measured in arc/minute. The clogging condition was measured by the temporal change in the pressure difference (△pkg/ground) before and after the filling.

The results are shown in Table 3.

As can be seen from the upper table of Table 3, clogging occurs considerably faster when crushed particles are used compared to the spherical bodies according to the present invention.

This difference occurs because the surface of crushed grains is not spherical, but angular, and has many irregularities, so the voids in the packed bed are also small and complex, making them more likely to become clogged as described above. It is thought that this is because of this.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional side view of the mixed oil removal device, Figs. 2 to 6 are graphs showing the results of mixed oil removal rates in Examples 1 to 5, and Fig. 7 is a partial cross-sectional side view of the mixed oil removal device. This is a flow sheet of an oil/water separator for removing . 1... Mixed oil removal device, 2... Organosilicon compound film forming spherical body, 3... Organosilicon compound film forming columnar body, 4... Cutting machine group. , 5・
... Reservoir tank, 6 ... Separation tank, 62 ... Mixed oil, 63 ... Drop-off cutting fluid from which mixed oil has been removed, 7 ... ... Oil tank, 8... Mixed oil tank. Figure 7 Figure 2 Figure 3 Scales Figure 6 Pigeon Figure 5 Pigeon

Claims (1)

[Claims] 1. In a device for removing mixed oil such as hydraulic oil and lubricating oil mixed in water in an unstable state, a device with a diameter of 0.5 to 6.7 mm whose surface is coated with an organic silicon compound.
A first layer is formed by filling a large number of spherical bodies, and a second layer is formed by filling a bundle of a large number of columnar bodies whose surfaces are coated with an organic silicon compound, and contains the mixed oil. A device for removing mixed oil, characterized in that the water passing through the first layer passes along the axial direction of the second layer and its columnar body.