JPH04338201A - Method and equipment for disintegration treatment of emulsion oil - Google Patents

Abstract

PURPOSE:To efficietly separate emulsion oil into a water component and an oil component. CONSTITUTION:Emulsion oil 17 stored in an emulsion oil tank 4 is supplied to a heat exchanger 5 in a water tank 1 heated to a proper temperature through the first piping 7 and heated, and at the same time a pressure adjusting valve 15 arranged in the second piping 9 connected to the line outlet of the heat exchanger 5 adjusts pressure in the piping to pressurize the emulsion oil 17 flowing through the line. By the heating and pressurizing, the emulsion oil 17 is forcibly separated into a water component and an oil component to make it flow in an oil reservoir 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention decomposes used oils such as cutting oils, lubricating oils, gear oils, and machine oils used in metal processing such as plating processes, precision parts cleaning processes, and hardening processes. The present invention relates to a method for carrying out the method and an apparatus for carrying out the method.

0002

[Prior Art] Most of the used oil mentioned above is recovered as emulsion oil, but in order to separate and collect such emulsion oil, conventional methods such as centrifuges and filters have been used. The methods used include a mechanical method using an emulsion breaker, a method of mixing an emulsion breaker to separate the oil, and a method of floating the oil in a tank using a difference in specific gravity.

0003

[Problems to be Solved by the Invention] However, according to the above-mentioned mechanical separation method, separation processing takes time and reliable separation and collection is not possible. The maintenance is troublesome as one has to wait for the passage of time. In addition, the method based on specific gravity difference requires a lot of processing time because the oil is separated naturally like using a demulsifier, and it is difficult to reliably separate only the oil from the emulsion oil. It has the following problems.

The present invention has discovered that the higher the heat and the more pressure is applied to emulsion oil, the more rapidly the bonds are separated. Focusing on this point, the present invention efficiently and reliably removes oil from emulsion oil. The object of the present invention is to provide a method for decomposing emulsion oil that can be separated and recovered, and an apparatus used to carry out the method.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the emulsion oil decomposition treatment method of the present invention forcibly removes oil and moisture by heating the emulsion oil in a tank while pressurizing it through piping. This method is characterized in that the oil is separated from the oil, and then led to an oil storage tank to form a separated layer within the tank.

[0006] Furthermore, as an apparatus for implementing this method, an emulsified oil tank containing emulsion oil and a heat exchanger are arranged in a water tank heated to an appropriate temperature, and an oil storage tank is provided outside the water tank. The emulsified oil tank and the heat exchanger, and the heat exchanger and the oil sump tank are connected through a first pipe having a liquid feed pump and a second pipe having a pressure regulating valve, respectively, and a moisture discharge pipe and a water discharge pipe are connected to the oil sump tank. It has a structure in which it is connected to an oil discharge pipe. In this apparatus, a demulsifier tank is provided outside the water tank, and the demulsifier in the tank is supplied into the emulsified oil tank.

[0007]

[Operation] The emulsion oil stored in the emulsified oil tank is heated by being supplied to the heat exchanger through the piping, and the emulsion oil flowing in the piping is pressurized to a constant pressure by the pressure adjustment valve. The oil molecules and water molecules therein will rapidly separate. When the emulsion oil subjected to such physical separation treatment is discharged into an oil storage tank, it immediately separates into an oil layer and a water layer in the tank.

[0008] At this time, the aqueous layer may contain oil that cannot be separated by the above operation, and in this case, the separated aqueous layer in the oil reservoir tank is returned to the emulsified oil tank and the tank is A demulsifying agent is supplied into the tank, and is separated into oil and water and recovered through the pipe.

[0009]

[Embodiment] Next, an embodiment of the present invention will be explained with reference to the drawings. 1 is a water tank, and a heater 2 is installed at the inner bottom of the tank.
This heater 2 is connected to a control panel (
(not shown) to automatically adjust the temperature to an appropriate temperature. Furthermore, an emulsified oil tank 4 containing an emulsion oil 3 and a heat exchanger 5 are arranged in the water tank 1, and a liquid sending pump 6 connects the bottom of the emulsified oil tank 4 and the pipe inlet of the heat exchanger 5.
They are connected and communicated by a first pipe 7 provided with.

Reference numeral 8 denotes an oil storage tank disposed at a suitable location outside the water tank 1. Its upper end and the pipe outlet of the heat exchanger 5 are connected and communicated through a second pipe 9, and its bottom and lower end A water extraction pipe 12 and an oil extraction pipe 13 having valves 10 and 11 are respectively connected to the second pipe 9, and a pressure meter 14 and a pressure regulating valve 15 are provided in the second pipe 9.

Reference numeral 16 denotes a liquid tank containing a demulsifier (emulsion breaker) 17 installed at a suitable location outside the water tank, and a supply pipe 19 having a metering pump 18 for adding the demulsifier.
It communicates with the emulsified oil tank 4 through the emulsified oil tank 4. This communication structure includes the first pipe 7, which has one end opening of the supply pipe 19 immersed in the inner bottom of the liquid agent tank 16, and the other end opening of the first pipe 7, which opens into the inner bottom of the emulsified oil tank 4. It is facing the open end. 20 is a return pipe equipped with a valve 21 and a return pump 22 connected to the water extraction pipe 12, and is connected to the emulsified oil tank 4.
It is not necessary to provide this connection.

In order to decompose emulsion oil into water and oil using the emulsion decomposition treatment apparatus constructed as described above, first, the emulsion oil to be treated is stored in the emulsified oil tank 4, and the water tank 1 is The water 23 reaches a depth near the upper end of the emulsified oil tank 4 and the heat exchanger 5 is immersed therein.
After that, the heater 2 is turned on and the temperature is adjusted to maintain the water 23 in the tank at a temperature of about 80°C.

When the liquid sending pump 6 is operated in this state, the emulsion oil 3 in the emulsified oil tank 4 is pumped through the first pipe 7 to the heat exchanger 5 and heated, and then passed through the heat exchanger 5 to the second pipe. It leaks to 9th. At this time, the pressure within the pipe is controlled by the pressure regulating valve 15 disposed in the second pipe 9 to be equal to or higher than 9 kg/cm2, preferably 9 kg/cm2.
The emulsion oil flowing through the piping is pressurized by adjusting the pressure to ~12 kg/cm2.

Therefore, in the emulsion oil 3 flowing through the heat exchanger 5, the separation action between water molecules and oil molecules is accelerated by the above heating and pressurization, and the emulsion oil 3 flows from the first pipe 7 to the second pipe 9.
The oil is rapidly separated during the flow and flows into the oil storage tank 8.

[0015] When the emulsion oil flows into the oil storage tank 8, the emulsion oil separated into water molecules and oil molecules immediately
Water and oil are separated and aggregated, and the upper layer becomes an oil layer 24 and the lower layer becomes an aqueous layer 25. After this water layer 25 is discharged from the oil reservoir tank 8 through the take-out pipe 12 by opening the valve 10, the oil layer 24 is recovered through the take-out pipe 13 by opening the valve 11.

On the other hand, some emulsion oils cannot be separated into water and oil by the physical method of heating and pressurizing, and the oil is mixed into the water layer 25. In this case, the water layer 25 is returned to the emulsified oil tank 4 through the return pipe 20 by opening the valves 10 and 21. Note that, without providing the return pipe 20, the oil-containing water discharged from the water extraction pipe 12 may be stored in a suitable container and then introduced into the emulsified oil tank 4.

Then, while maintaining the temperature of the heat exchanger 5 and the pressure by the pressure regulating valve 15 under the above conditions,
When the metering pump 18 is operated and a fixed amount of the demulsifying agent 17 in the liquid agent tank 16 is supplied to the inner bottom of the emulsified oil tank 4 through the supply pipe 19, the demulsifying agent 17 faces the suction port of the first pipe 7. Therefore, the liquid is sucked into the first pipe 7 while being stirred and mixed with the emulsion oil 3 in the emulsified oil tank 4 by the suction force generated by the operation of the liquid feeding pump 6. As the demulsifier 17, the trade name Neodemulsion S or Neodemulsion U (manufactured by Nagai Surface Technology Laboratory Co., Ltd.) is used, and when this demulsifier is used, the amount added is 3% or less. is sufficient.

While flowing through the second pipe 9 from the first pipe 7 through the heat exchanger 5, it is heated and pressurized in the same manner as described above to be separated into water molecules and oil molecules, and the demulsifier 17 The oil that cannot be physically separated is chemically separated, flows into the oil reservoir tank 8, and is separated into an oil layer 24 and a water layer 25 in the same manner as described above. Thereafter, the aqueous layer 25 is redistributed into the emulsified oil tank 4.
The emulsion is broken by adding the demulsifying agent 17 in the same manner as above, and this step is repeated several times to completely separate the oil and water.
2 and 13 are opened and collected respectively.

[0019] If the emulsion oil is of an oil quality that can be completely separated by physical manipulation of water and oil by heating and pressurizing, the addition of the demulsifier 17 is unnecessary. It is also possible to use the demulsifier 17 from the beginning and perform the separation process with the above apparatus.

[0020]

As described above, according to the present invention, the emulsion oil in the tank is heated while being pressurized through the piping to forcibly separate oil and water, and the oil and water are led out to the oil storage tank. Since a separation layer is formed inside the piping, the emulsion oil is rapidly decomposed into water and oil by heating and pressurization while passing through the piping, and the separation process can be performed efficiently in a short time. Even a large amount of emulsion oil can be easily and effectively separated using a small-scale device without being stored in a container, and the oil can be efficiently recovered.

[Brief explanation of drawings]

FIG. 1 is a simplified longitudinal sectional side view of an emulsion decomposition device.

[Explanation of symbols]

1　Aquarium 2 Heater 3 Emulsion oil 4 Emulsified oil tank 5 Heat exchanger 6 Liquid pump 7 First piping 8 Oil storage tank 9 Second piping 15 Pressure adjustment valve 16 Liquid agent tank 17 Demulsifier

Claims (3)

[Claims] [Claim 1] The emulsion oil in the tank is heated while being pressurized through piping to forcibly separate oil and water, and the oil and water are forcibly separated, and the oil and water are led out to an oil storage tank and a separated layer is formed in the tank. A method for separating emulsion oil. 2. An emulsified oil tank containing emulsion oil and a heat exchanger are arranged in a water tank heated to an appropriate temperature, and an oil storage tank is provided outside the water tank, the emulsified oil tank and the heat exchanger,
The heat exchanger and the oil reservoir are communicated through a first pipe having a liquid pump and a second pipe having a pressure regulating valve, respectively, and a water discharge pipe and an oil discharge pipe are connected to the oil reservoir. An emulsion oil decomposition treatment device characterized by: 3. The emulsion oil decomposition treatment apparatus according to claim 2, further comprising a demulsifier tank disposed outside the water tank, and the demulsifier in the tank is supplied into the emulsified oil tank.