JPH0661405B2 - Oil-water separation filter - Google Patents

Description

TECHNICAL FIELD The present invention relates to an oil / water separation filter,
More specifically, it relates to a filter for selectively separating oil using a porous conduit having a fine pore size.

(Prior Art) Conventionally, mechanical oil has been used for the purpose of lubrication, cooling, cleaning, a heat medium, an energy transfer medium, etc., but the environment in which the oil is used is not necessarily good. Machine oil is exposed to moisture in the outside air, and due to repeated temperature rises and falls,
We are constantly exposed to the danger of contamination such as moisture. For example,
The oil used for the transfer device and the water used for cooling are easily mixed in the rolling process of the steel mill. Such oil is
If it is used as it is, the characteristics of oil are not fully exhibited, such as deterioration of mechanical performance and promotion of corrosion.

Therefore, various systems are used as an indispensable process for oil-water separation. For example, there are a phase separation method based on the difference in specific gravity, a method of selectively separating oil or water using an adsorbent, a method of centrifugation, and the like.

(Problems to be Solved by the Invention) An organic fatty acid that causes deterioration of oil by filling an adsorbent such as zeolite or bentonite into a porous bag body such as Japanese paper or filter paper to form a regenerated bag of oil. An oil recycling bag for removing water and moisture is disclosed (Japanese Patent Laid-Open No. 59-12929).
No. 7). In this method, the ability to adsorb moisture and the like is constant, and when the adsorption amount is saturated, it is necessary to replace the regeneration bag, the adsorbent cannot be used continuously, and substances other than water and the like can be removed. It must be removed by another means.

Further, JP-A-56-150406 discloses a centrifugal oil separation device. In the present invention, the porous plate is set in multiple stages and is an apparatus for continuously separating oil and water by utilizing the difference in viscosity between oil and water, but each interval of the porous plate is a mixed fluid to be treated. However, there is a problem that it is difficult to make the adjustment, that is, to drain water completely, because it is greatly affected by the properties and treatment amount.

The present invention solves the above-mentioned drawbacks and provides a simple filter capable of continuously separating oil and water, thereby reducing the amount of oil used for oil recycling and the amount of waste oil incinerated or disposed of. The purpose is to reduce equipment costs and expenses.

(Means for Solving Problems) The above-mentioned various objects are the average pore diameter of the present invention of 1.0 to 7.2.
A porous ceramics conduit having a diameter of μm and an outer surface of the porous conduit are provided so as to be surrounded by an oil pressure resistant enclosure having at least one oil outlet, and the one oil outlet is provided with an oil outlet. When the oil-water separation operation of the medium water type liquid is completed, the oil component located in the space surrounded by the outer surface of the porous ceramics conduit and the inner surface of the oil pressure resistant enclosure may cover the outer surface of the porous conduit. This is achieved by an oil-water separation filter of a water-in-oil type liquid, which is provided at a position where it can be formed, and the surrounding body and the porous conduit are integrated.

Hereinafter, the oil-water separation filter of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of the oil / water separation filter of the present invention. That is, in the oil / water separation filter 1 according to the present invention, the porous conduit 2 is inserted in the axial direction of the oil pressure resistant enclosure 3 having the oil outlets 4 and 5, and the inner surface of the oil pressure resistant enclosure 3 and the A space 8 is formed between the porous conduit 2 and the outer surface thereof, and a mixed fluid introduction pipe 9 and a treatment mixed fluid discharge pipe 10 are connected to each end of the porous conduit 2. A valve 6 is provided in the oil outlet 5 as required. A mixed fluid of oil and water is introduced along the inner wall of the porous conduit 2 in the longitudinal direction, for example, in the direction of arrow 7, and among the mixed fluids introduced under pressure,
Only the oil component is selectively separated by the porous body, flows out into the space 8 formed by the outer surface of the porous conduit 2 and the inner surface of the oil pressure resistant enclosure 3, and further flows out of the system by the oil outlet 4 to remove moisture. An oil containing no is obtained.

The mixed fluid used in the present invention has a different mixed state due to the influence of the viscosity of oil, specific gravity, etc., and the state cannot be discussed unconditionally, but it is a water-in-oil type (W / 0), The separation filter 1 easily separates the oil regardless of the state of the oil exhibiting a complicated mixed state, and the more the continuous phase oil is, the higher the oil separation efficiency is. Further, it is possible to remove even if solid dust is contained. Agitate this mixed fluid with a stirrer or aeration, and heat it if necessary to reduce the viscosity of the oil content, and pump (not shown).
At 0.1 to 7 kg / cm ² , preferably 1 to ² kg / cm ² (gauge pressure) and introduced into the oil-water separation filter 1 . With respect to the mixed fluid to be supplied, the target oil component is selectively separated by the porous conduit and flows out in the direction perpendicular to the flow direction of the mixed fluid. In this cross-flow method, in addition to separation of oil, separation of other solids can be carried out at the same time.

The shape of the porous conduit tube 2 used in the present invention may be any shape that allows fluid to pass through the inside of the conduit tube. For example, the cross section perpendicular to the longitudinal direction of the conduit tube may be circular, elliptical, triangular, quadrangular, or the like. May be Here, the porous body 2 forming the conduit means SiC, carbon, alumina,
Porous ceramics such as activated alumina, glass, cordierite, mullite, lithium aluminum silicate, aluminum titanate or Ni, Cu, Al, T
It is at least one selected from the group consisting of porous powder sintered bodies such as i, Fe, Co and alloys thereof, and the porous ceramic is made of alumina because of its excellent pore homogeneity. Are most preferred. The average pore diameter of this porous conduit is 1.0 to 7.2 μm, preferably 1.6 to 4.2 μm. When the average pore diameter is larger than 72 μm, water is mixed in the separated oil, and when it is smaller than 1.0 μm, the separation efficiency is extremely poor and not practical. The pore size distribution is 1/2 of the average pore size.
90% of the total is within the distribution range with twice the pore size
The above is preferable. Furthermore, its porosity is 30-
It is 85%, preferably 40 to 85%. If it exceeds 85%, the strength of the porous conduit 2 as a material cannot be maintained, and if it is less than 30%, the oil separation efficiency is poor and it is not practical.

Further, the present invention may use the water-repellent porous conduit 2.

The water repellent used in the water repellent treatment of the present invention is a silicon resin,
Any one selected from the group consisting of acrylic resin, polyethylene resin, fluororesin and the like is preferable. The water repellent treatment can be obtained by impregnating the resin diluent, emulsion, or liquefied gas dispersion type liquid with the porous conduit and drying. For example, in the case of silicon resin, silicon resin raw material 0.2
The porous conduit 2 is impregnated with a solution obtained by diluting 5 g of methanol with a ratio of 100 g, and then heat-treated. In this impregnation operation, it is important not to clog the porous conduit 2, sufficiently maintain the strength of the coating, and satisfy the oil resistance performance.

Usually, the porous conduit 2 is a pipe-shaped tube, and one or more of the porous conduits 2 are enclosed in the oil pressure resistant enclosure 3.

According to the present invention, the oil content can be selectively separated from the mixed fluid of the oil content and water through the porous conduit 2, but the principle is as follows.
Unlike the conventional oil-water separation principle, it is considered that the reason is as follows. That is, in the agitated mixed fluid, water droplets are finely dispersed in the oil liquid and exist as spherical bodies, and are introduced into the porous conduit 2. An oil film is first formed on the porous inner wall, further reaches the porous outer wall, and oil is separated one after another. On the other hand, since water has no affinity for oil, it repels oil adhering to the pores of the porous conduit 2 and cannot pass through the pores. In this principle, it is assumed that the water can be separated if the porous conduit 2 is sufficiently wetted with water in advance.
Even when wetted with water, the water cannot be separated and further the oil component cannot be selectively separated.

That is, according to the oil pressure resistant enclosure 3 having at least one oil outlet used in the present invention, the porous conduit 2
Since the oil can be retained in the space 8 between the outer surface and the inner surface of the oil pressure resistant enclosure 3, the outer surface of the porous conduit tube 2 and its pores can be constantly wetted with oil. For example, when the porous conduit 2 is used with the longitudinal direction inclined with respect to the horizontal direction, the oil outlet 4
Is installed at the highest position, the space 8
Is always filled with oil, and even at the time of restart, the pores do not become clogged with water and the oil separation efficiency is not impaired. Further, it is more preferable that the oil content is directly introduced and retained on the inner surface of the porous conduit 2 at the time of stop. The silicone-treated porous conduit 2 has the effect of effectively preventing clogging by water with water repellency, and the operation is simplified. Further, depending on the condition setting, when solid matter such as dust easily adheres and the separation efficiency decreases, pressure is applied to the internal space 8 of the oil pressure resistant enclosure 3 from the oil introduction port 4 and / or the oil introduction port 5 ( It also has the feature that it can be regenerated by hydraulic pressure). The oil-proof and pressure-resistant enclosure 3 may have any shape as long as it can surround the porous conduit 2 with a gap between the outer surfaces of the porous conduit 2, and for example, it is perpendicular to the longitudinal direction of the tubular body 3. The cross section may be circular, elliptical, triangular, quadrangular, or the like. Here, the oil pressure resistant enclosure 3 is preferably a metal pipe made of stainless steel.

The outer surface of the porous conduit 2 and the contact portion of the oil pressure resistant enclosure 3 and the outer surface of the porous conduit 2 and the contact portion of the mixed fluid introduction pipe 9 or the mixed fluid discharge pipe 10 are made of an oil resistant sealing material, for example, Teflon such as Viton. It is more preferable to use it because the liquid tightness is improved. In this way, the oil component selectively separated by the oil-water separation filter of the present invention has no emulsification at all, and no precipitation of water was observed even when left to cool for about 1 day, and in addition, generation of ice at 0 ° C. or less was not observed. Furthermore, impurities other than water, such as solids, can be removed at the same time, and can be directly used as a reclaimed oil and in some cases as a refined oil.

(Operation) With the oil-water separation filter according to the present invention, it is possible to simply and continuously separate the oil component from the water-in-oil (W / 0) mixed fluid and simultaneously remove dust and the like.

(Embodiment) Hereinafter, one embodiment of the present invention will be described more specifically with reference to the drawings.

Embodiment 1 FIG. 2 is an explanatory view showing one embodiment of the present invention. That is, the mixed fluid introduction pipe 9 and the mixed fluid discharge pipe 10 are connected to the respective ends of the oil-water separation filter 1, and the other end of the mixed fluid introduction pipe 9 is connected to the pump 21 and the mixed fluid discharge pipe 10 is connected. The other end of is guided to the container 12, and the pump 21 is also connected to the container 12. Oil separation filter
1 is shown partially broken away, in which the porous conduit 2
Has been paid.

As the porous conduit 2, 19 alumina pipes having an outer diameter of 10 mmφ, an inner diameter of 8 mmφ and a length of 520 mm, having characteristics of an average pore diameter of 1.6 μm and a porosity of 43% were used.
As an oil component, 92% by volume of Bonnock sp260 (manufactured by Nippon Oil Co., Ltd.) and 8% by volume of water were charged into the container 12, and sufficiently mixed with the stirrer 14, and at the same time, 46 to 50 with the heater 15.
It was kept heated to% (measured by a thermometer 13).

Pump mixed fluid 11 (Ebara SCDIII type, 3 phase 2
00V, 0.75kw) before flowing at 21 lubrication cup 23
The valve 19 was opened with the Bonnock sp260 (oil content) that had been put in advance in Table 1 to sufficiently wet the inner wall of the alumina pipe 2.

Then, the pump 21 was operated, the mixed fluid 11 was introduced into the alumina pipe 2, and the separation of oil was started. Adjust the valve 20 with the mixed fluid 11 to adjust the inlet pressure to 1.0 kg / cm ²
(Gauge pressure gauge 22) and the cross flow amount is 20.2
/ Min. The separated oil was introduced from the oil outlet 4 into the container 24, while the mixed fluid discharged from the oil / water separation filter was collected in the container 12 and used again as the mixed fluid. The water in the container 12 was drained from the drain pipe 16 by opening the valve 17. The oil could be separated by 6.5 / hour. From the obtained oil, 20 ml was sampled, placed in a test tube and allowed to cool for 24 hours. Then, the presence or absence of water precipitation was visually confirmed.

Further, the same procedure was carried out for alumina pipes having average pore diameters of 2.3 μm and 4.2 μm, and the results are shown in Table 1.

Example 2 Example 1 was repeated except that a silicone-treated alumina pipe was used to impart water repellency, and the results are shown in Table 1.

Silicone treatment was performed using an alumina pipe (outer diameter 10 mmφ, inner diameter 8 mmφ, length 520 mm, 19 pieces, porosity 43%, average pore diameter 1.6 μm, 2.3 μm and 4.2 μm) with 0.25 g of silicon resin in methanol. After dipping in a solution diluted at a rate of 100 g, heat treatment was performed.

Example 3 Example 3 was repeated except that 97% by volume of Diamond BR oil 205 (manufactured by Mitsubishi Oil Co., Ltd.) and 3% by volume of water were used as oil components. The results are shown in Table 1.

Example 4 Bonnock sp260 as oil, 67% by volume, water 33
Example 1 was repeated except that an alumina pipe having a volume% and an average pore diameter of 4.2 μm was used. The results are shown in Table 1.

Comparative Example The same procedure as in Example 2 was carried out except that an alumina pipe having an average pore diameter of 10.2 μm was used. The results are shown in Table 1.

Examples 5-6 For Examples 1-3, the crossflow pressure was further increased to 0.5,
The procedure was changed to 0.7 and 1.3 kg / cm ² and carried out in the same manner as in each example.

The result corresponding to Example 1 is shown in FIG. 3 as a diagram showing the relationship between the inlet pressure and the amount of separated oil, similarly the result corresponding to Example 2 is shown in FIG. 4, and the result corresponding to Example 3 is shown in FIG. It is shown in FIG.

From the above results, the oil component separated by using the oil-water separation filter of the present invention is free from emulsification phenomenon due to water and ice settling due to cooling, and thus can be sufficiently used as a regenerated oil. Needless to say, the oil is transparent because impurities such as solids can be removed by using this filter.

(Effect of the Invention) As described above, the present invention has an average pore diameter of 1.0 to 7.2 μm.
m porous ceramic conduit and the outer surface of the porous conduit are provided so as to be surrounded by an oil pressure resistant enclosure having at least one oil outlet, and the one oil outlet is When the oil-water separation operation of the medium water type liquid is completed, the oil component located in the space surrounded by the outer surface portion of the porous ceramic body conduit and the inner surface of the oil pressure resistant enclosure resistance can cover the outer surface portion of the porous conduit. The present invention relates to an oil-water separation filter for a water-in-oil type liquid, characterized by integrating the surrounding resistance and the porous conduit at a position, and efficiently and continuously selecting oil by a simple means. It can be separated into two and contribute to resource saving and energy saving.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the oil-water separation filter of the present invention, FIG. 2 is an explanatory view showing one embodiment of the present invention, and FIGS. 3 to 5 are inlet pressure and separation in one embodiment of the present invention. It is a graph which shows the relationship with an oil amount. 1 ... Oil-water separation filter, 2 ... Porous conduit, 3 ... Oil pressure resistant enclosure, 4,5 ... Oil outlet, 8 ... Space, 11 ... Mixed fluid, 18 ... Valve, 21 ... … Pump, 22… Pressure gauge.

Claims (1)

[Claims] 1. An oil pressure resistant enclosure having a porous ceramics body conduit having an average pore diameter of 1.0 to 7.2 .mu.m and at least one oil outlet opening at an outer surface portion of the porous conduit body. And the one oil outlet is provided in a space surrounded by the outer surface of the porous ceramic body conduit and the inner surface of the oil pressure resistant enclosure when the oil-water separation operation of the water-in-oil type liquid is completed. An oil-water separation filter for a water-in-oil type liquid, characterized in that the positioned oil is provided at a position where it can cover the outer surface of the porous conduit, and the surrounding body and the porous conduit are integrated.