JP7328486B2 - Dissolved gas removal method and dissolved gas removal device - Google Patents

Description

The present invention relates to dissolved gas removal technology.

The liquid filled in the cylinder contains gas. Dissolved gas may not be a hindrance in some cases. However, dissolved gases often cause problems. From such a point of view, dissolved gas removal (deaeration) treatment is performed. For example, in FIG. 3, 11 is a large raw material container in which a liquid 12 is stored. 13 is a cylindrical cylinder. Gas is pressurized in the raw material container 11 and the liquid 12 in the raw material container 11 is transported into the cylindrical cylinder 13 . After the cylindrical cylinder 13 is filled with a predetermined amount of liquid, the gas in the cylindrical cylinder 13 is exhausted by a pump (vacuum pump) 14 . Due to the reduced pressure in the cylindrical cylinder 13, the dissolved gas dissolved in the liquid filled in the cylindrical cylinder 13 moves to the gas phase side. That is, the dissolved gas is removed by the decompression process.

JP 2018-30065 Special table 2011-504803 JP 2006-234650 Japanese Patent Application Laid-Open No. 2003-71206

It took a long time to remove the dissolved gas. Assume that the cylindrical cylinder 13 has a cross-sectional area of 0.015 m ² and a height of 0.85 m, and that the cylindrical cylinder 13 is filled with 0.008 m ³ of liquid. Vacuum suction (decompression) processing in the cylindrical cylinder 13 is performed by the exhaust operation by the pump 14 . The time required for this operation is approximately one minute. However, after the evacuation operation, it was necessary to stand still for about 6 hours. Due to this standing, dissolved gas (dissolved gas dissolved in the liquid filled in the cylindrical cylinder 13) moves to the gas phase side. This transition was gradual and took time. In order to make the amount of dissolved gas equal to or less than the reference value (the reference value is specified by the customer (shipment destination)), the operation (exhaust→still) is usually performed three times. Then, the required time is about 18 hours. When the customer requested further reduction of the dissolved gas amount, the above operation was sometimes required five times or more. Then, the required time is about 30 hours. For this reason, it took about one day from filling the cylinder to shipping. Although the operations are automatic, in some cases human intervention is required. It was expensive because it required a lot of time and manpower.

Accordingly, the problem to be solved by the present invention is to solve the above problems. In other words, the object is to provide a technique for completing the removal of dissolved gas in a short period of time.

Intensive efforts have been made to find out the cause of the removal process taking a long time. As a result, the inventors have found that it takes time for the gas dissolved in the liquid present in the lower portion of the cylindrical cylinder 13 to move upward and reach the gas phase. Whether or not the relationship between depth and time is linear or not, the time required for the gas dissolved in the deep (lower) liquid to rise to the gas phase by decompression treatment is the shallow (upper) It will be appreciated that the gas dissolved in the liquid at the location will take a long time to rise to the vapor phase. This causal relationship is natural. However, no one noticed this and tried to deal with it. The present invention is made based on such a phenomenon (causal relationship). That is, since the gas dissolved in the liquid at the lower position must also be removed, the inventors realized that the depth of the liquid phase during the degassing process should be made shallow.

The present invention was made based on such findings.

The present invention
A device for reducing the amount of dissolved gas in the liquid in container A to a reference value or less,
The device comprises a transport path through which the liquid in container B is transported into container A,
A device is proposed in which the transport path comprises a vacuum chamber.

The present invention is the apparatus, wherein the decompression chamber preferably has a width (average length in the width direction of the liquid transported in the decompression chamber) W>depth (the depth of the liquid transported in the decompression chamber) We propose a device constructed to satisfy the average thickness H).

The present invention is the apparatus as described above, preferably, the transport path includes a transport path extending in a substantially horizontal direction, and the decompression chamber is formed in the transport path extending in a substantially horizontal direction. We propose a device that

The present invention is the apparatus, wherein the transport path preferably further includes a vertical transport path connected to one end side of the transport path extending in the substantially horizontal direction, and a transport path extending in the substantially horizontal direction. and a vertical transport path connected to the other end of the transport path.

The present invention proposes a device as described above, preferably wherein said W is greater than or equal to 1.3 times said H.

The present invention proposes said device, preferably said H is less than or equal to 0.3 m.

The present invention proposes said device, preferably wherein said W is greater than or equal to 4 cm.

The present invention is the apparatus, wherein the inner shape of the decompression chamber is, for example, a substantially flat box shape, and the average length L1 in the substantially flat box shape in the transport direction of the transported liquid and the average length L1 in the substantially flat box shape in the transport direction An apparatus configured such that the average length W1 in the width direction substantially orthogonal to the transport direction and the average length H1 in the depth direction of the transported liquid in the substantially flat box shape satisfy L1>H1 and W1>H1. Suggest.

The present invention proposes a device as described above, preferably wherein L1 is 13 cm or more, W1 is 4 cm or more, and H1 is 0.3 m or less.

The present invention is the apparatus, preferably 0<H/S (H is the average depth of the liquid transported in the decompression chamber. S is the liquid and gas transported in the decompression chamber. The area of the interface with the phase.The units of the physical quantities of H and S are cm.)≦0.0395.

The present invention proposes such a device, said device further comprising a container B.

The present invention proposes a device as described above, said device further comprising a container A.

The present invention
A method for reducing the amount of dissolved gas in liquid in container A to a reference value or less, comprising:
The liquid in the container A is transported from the container B,
A method is proposed in which the liquid undergoes decompression treatment at a location where width (average length in the width direction of the liquid during transportation) W>depth (average depth of the liquid during transportation) H.

The present invention
A method for reducing the amount of dissolved gas in liquid in container A to a reference value or less, comprising:
The liquid in the container A is transported from the container B,
During the transportation, the liquid is controlled so that its thickness is 0.3 m or less,
A method is proposed in which the liquid undergoes decompression treatment in a state where the thickness of the liquid is 0.3 m or less.

The present invention
A method for reducing the amount of dissolved gas in liquid in container A to a reference value or less, comprising:
The liquid in the container A is transported from the container B,
During the transport, the liquid is controlled to have a thickness of less than 0.3 m;
A method is proposed in which the liquid undergoes a decompression process in a state where the thickness of the liquid is less than 0.3 m.

The invention proposes a method, wherein said method is implemented in said device.

Dissolved gas removal processing (deaeration processing) is completed in a short time.

Schematic diagram of a main part of a device (dissolved gas removal device) according to one embodiment of the present invention Graph showing features of the present invention Illustration of conventional dissolved gas removal

Embodiments of the present invention are described below.

A first invention is an apparatus. The device is a device for reducing the amount of gas dissolved in the liquid in the container A to a reference value or less. The reference value is determined by the customer who purchases the liquid. Said reference value depends on the application in which said liquid is used. Said apparatus comprises a transport channel through which the liquid in container B is transported into container A. Said transport path comprises a decompression chamber. The present invention is configured such that decompression processing is performed in the transportation path (during transportation of the liquid).

The depth (average depth: height: thickness) of the liquid in the transport path can be much smaller than the depth (height) of the liquid filled (stored: preserved) in the cylindrical cylinder. Of course, if the cylindrical cylinder is shaped like a flat box, the height of the filled (stored) liquid can be reduced. If the degassing process is performed using a cylinder with a small height structure, the time required for degassing can be shortened. However, the flat box-shaped cylinder with a low height (this means that the area is widened if the cylinder capacity is the same) requires a large area for installation (storage) of the cylinder. This is not realistic. Therefore, the flat box-shaped cylinder with a reduced height (larger area) has not yet been provided.

Now, as described above, it is easy to reduce the depth (thickness) of the liquid in the transport path in the middle of the transport path. Even if a part of the transport path is formed in a flat box shape, the problem caused in the case of the flat box shaped cylinder is greatly improved. In the present invention, the dissolved gas removal (degassing) treatment is performed not after filling the cylinder but before filling the cylinder, that is, during transportation. Therefore, the time required for deaeration could be greatly shortened.

The transport path preferably comprises a transport path extending in a substantially horizontal direction. The decompression chamber is configured in the transport path extending in the substantially horizontal direction. If the transport path has a transport path extending in a substantially horizontal direction, even if this transport path is tall, if the amount of liquid transported is reduced, the depth of the liquid in this transport path will increase. can be made shallower. Therefore, it is convenient for the transport path to have a transport path extending in a substantially horizontal direction. Of course, normally the transport path is not inclined, but horizontal. However, if there is no problem with transportation, the transportation route may be slightly inclined. The "approximately" in the "substantially horizontal plane direction" has such a meaning.

The transport path preferably includes a vertical transport path connected to one end side of the transport path extending in the substantially horizontal direction. The transport path preferably includes a vertical transport path connected to the other end side of the transport path extending in the substantially horizontal direction. The transport path in the vertical direction may be only one end side of the transport path extending in the substantially horizontal direction. Of course, it is more preferable to be provided at both ends. In particular, it was preferable to provide a vertical transportation path connected to the container A side. The reason for this is that the liquid is degassed in the transport path extending in the substantially horizontal direction. The degassed liquid drops along the inner wall of the vertical transport path and fills the container A. As shown in FIG. The liquid that has fallen along the inner wall of the vertical transport path is just like a thin film. Therefore, the liquidus thickness is very thin. Since the degassing process is performed even in this thin film state, degassing is effective. Furthermore, the liquid falling along the inner wall of the substantially vertical transport path was subjected to an effect similar to stirring. Degassing was therefore more effective.

The decompression chamber is preferably configured to satisfy width (average length in the width direction of the liquid transported in the decompression chamber) W > depth (average thickness of the depth of the liquid transported in the decompression chamber) H. It is This requirement means that the depth of the liquid transported through the vacuum chamber is shallow. This is self-evident if one considers a river with a wide width and a river with a narrow width. It would be self-explanatory if we consider the narrow upstream side and the wide downstream side. The wider the width, the shallower the height (depth) of a given volume of liquid flowing through it. Therefore, it will be easily understood that the condition W>H is preferable. More preferably, the W is 3.8 times or more the H. More preferably, said W was 18.4 times or more said H. That is, by satisfying such a dimensional relationship, the features of the present invention were remarkably exhibited.

Said H was preferably 3 cm or less. More preferably, it was 2 cm or less. There is no theoretical limit on the lower limit. As the H approaches 0, the time required for degassing (dissolved gas removal) is shortened. However, when H approaches 0, the liquid transport rate decreases. This reduces overall efficiency. Therefore, the lower limit of H was about 0.5 cm. By satisfying such dimensional relationships, the features of the present invention are remarkably exhibited.

The inner shape of the decompression chamber is, for example, a substantially flat box shape. This is because the meaning of "substantially" in this "substantially flat box shape" is to allow deformation. For example, it means that the bottom surface side of the decompression chamber may be arc-shaped (elliptical arc shape: wave shape: curved line). From the technical point of view of the present invention, the bottom side of the decompression chamber need not have a flat structure (shape). For the same reason, the upper surface side (top surface) of the decompression chamber does not need to have a flat structure (shape). In particular, since the liquid to be transported is not in contact with the top surface on the top surface side, there are no restrictions on the bottom surface side or more. For the same reason, the side surfaces of the decompression chamber need not have a flat structure (shape). Of course, a structure (shape) with a flat bottom surface is easier to manufacture. When the decompression chamber is configured in the substantially flat box shape, it is preferable that the requirements (L1>H1, W1>H1) are satisfied. Said L1=average length in the transport direction of the transported liquid in the substantially flat box shape. W1=average length in the width direction substantially orthogonal to the transport direction in the substantially flat box shape. Said H1=average length in the depth direction of the transported liquid in the substantially flat box shape. More preferably, 0<H1/L1<2.2 and 0<H1/W1<6.8. By satisfying such dimensional relationships, the features of the present invention are remarkably exhibited.

Preferably, said L1 was 13 cm or more. More preferably, the L1 was 0.5 m or more. More preferably, the L1 was 0.8 m or more. Preferably, the W1 is 4.2 cm or more. More preferably, the W1 is 4.5 cm or more. More preferably, the W1 is 9.2 cm or more. Preferably, the H1 was 0.3 m or less. More preferably, the H1 is 2 cm or less. The lower limit of H1 was about 0.5 cm. By satisfying such dimensional relationships, the features of the present invention are remarkably exhibited.

The vacuum chamber has requirements (0 < H/S ≤ 0.04 (H = average thickness of the depth of the liquid transported in the vacuum chamber, S = the ratio between the liquid transported in the vacuum chamber and the gas phase) The area of the interface.) The units of the physical quantities of H and S are cm.). More preferably, 0<H/S≦0.003. More preferably, 0<H/S≦0.0007. In short, the surface area of the liquid exposed to the gas phase is large compared to the depth of the liquid in the decompression chamber. By doing so, degassing by pressure reduction was effectively performed. By satisfying such dimensional relationships, the features of the present invention are remarkably exhibited.

The depth (average thickness of the depth of the liquid transported in the decompression chamber) H, the width (average length in the width direction of the liquid transported in the decompression chamber) W, the average length in the transportation direction of the transported liquid The meaning of "average" in L1, the average length W1 in the width direction substantially orthogonal to the transport direction, the average length H1 in the depth direction of the transported liquid, etc. is as follows. When the W, H, L1, W1, and H1 are constant regardless of location, the average is the constant value. When W, H, L1, W1, and H1 fluctuate, an integral value is obtained for the length along the direction, and the integral value is divided by the length to obtain an average value. The liquid depth (average thickness of the liquid depth) H is obtained as follows. If the depth of the liquid in the width direction (perpendicular to the direction of the liquid flow path) is constant and the depth of the liquid along the direction of the liquid flow varies, The depth is obtained by dividing the integrated value (cross-sectional area) by the length of the flow path direction. H (the average thickness of the depth of the liquid transported through the vacuum chamber). If the depth of the liquid in the width direction (perpendicular to the direction of the liquid flow path) changes and the depth of the liquid along the direction of the liquid flow path is constant, then The integrated value of the depth of the liquid (cross-sectional area in the vertical plane perpendicular to the flow path direction) is obtained, and the value obtained by dividing this integrated value (cross-sectional area) by the length in the width direction is the depth (said H is the average thickness of the depth of the liquid transported through the vacuum chamber. If both the depth of the liquid in the width direction (perpendicular to the direction of the flow path of the liquid) and the depth of the liquid along the direction of the flow path of the liquid change, the volume value of the liquid in the region is obtained, The value obtained by dividing the volume value by the area value (the area value at the interface between the liquid and the gas phase in the region) is the depth (the average depth of the liquid transported in the decompression chamber) H. However, for example, if the bottom surface of the decompression chamber has grooves in part, the depth of the grooves is deep. At the location of the groove, the liquid is accumulated, but is not transported. That is, the liquid accumulated in the grooves is not transported into the container A. In such a case, the depth at that point is not included in "said depth (average depth of liquid transported through said vacuum chamber) H". i.e. ignored. The width (the average length in the width direction of the liquid transported in the decompression chamber) W is obtained as follows. When the width in the depth direction is the same (constant), that is, when the width changes only in the flow path direction of the liquid, the area value at the interface between the liquid and the gas phase is obtained, and the area value is The width (the average length of the liquid transported in the decompression chamber in the width direction) W is obtained by dividing the length of the liquid in the flow path direction. When both the width in the depth direction and the width in the flow direction of the liquid change, the volume value of the liquid in the region is obtained, and the volume value is the area value (the area at the interface between the liquid and the gas phase in the region value) is the width (the average length of the liquid transported in the vacuum chamber in the width direction) W. Average values of other physical quantities can also be obtained according to the above. When calculating the width (average length in the width direction of the liquid transported in the decompression chamber) W, basically, the average value of the width at the gas/liquid interface should be considered. This is because the release of dissolved gas depends greatly on the extent of the liquid surface. Average values of other physical quantities are also determined according to the above calculation.

The L1 was preferably 13 cm or more. More preferably, it was 0.5 m or more. More preferably, it was 0.8 m or more. Preferably it was 12 m or less. Said W1 is preferably 4.2 cm or more. More preferably, it was 4.5 cm or more. More preferably, it was 9.2 cm or more. Preferably, it was 0.6 m or less. The H1 was preferably 0.5 cm or more. More preferably, it was 1 cm or more. Preferably, it was 0.3 m or less. By satisfying such dimensional relationships, the features of the present invention are remarkably exhibited.

The H/S (the H is the average thickness of the depth of the liquid transported in the decompression chamber. The S is the interface area between the liquid transported in the decompression chamber and the gas phase. The physical quantities of the H and S The unit is cm.) was preferably 0.04 or less. More preferably, it was 0.002 or less. More preferably, it was 0.0007 or less. Preferably, it was 0 or more. More preferably, it was 0.000007 or more. By satisfying such dimensional relationships, the features of the present invention are remarkably exhibited.

A second invention is a method. The method is a method for reducing the dissolved gas amount of the liquid in the container A to a reference value or less. The liquid in container A is transported from container B. The liquid undergoes decompression treatment during transportation. In particular, the liquid undergoes decompression treatment at locations where width (average length in the width direction of the liquid during transportation) W>depth (average depth of the liquid during transportation) H. Alternatively, during the transport, the liquid is controlled to have a thickness of 0.3 m or less (eg, less than 0.3 m). Then, in a state where the liquid has a thickness of 0.3 m or less (for example, less than 0.3 m), the liquid undergoes decompression processing. Alternatively, the decompression treatment is performed using the apparatus.

Specific examples are given below. However, the present invention is not limited only to the following examples. Various modifications and applications are also included in the present invention as long as the features of the present invention are not greatly impaired.

FIG. 1 is a schematic diagram of a main part of an apparatus (dissolved gas removing apparatus) according to one embodiment of the present invention.

1, 2 and 3 are transportation routes. The transportation paths 1, 2, 3 may be made of metal pipes, resin pipes, or anything else. It is selected according to the liquid 4 to be transported. In this example, from the viewpoint of corrosion resistance, it is made of stainless steel. Liquid 4 in container B is transported into container A via transport paths 2 , 1 , 3 . The container B corresponds to the raw material container 11 in FIG. The container A corresponds to the cylindrical cylinder 13 in FIG. In FIG. 1, container B is omitted.

The transport line 1 is arranged horizontally. The transport path 1 has a flat box shape (rectangular parallelepiped shape: height (vertical dimension) H1 in the inner shape, length (length in the direction along the liquid flow path: length in the horizontal direction in FIG. 1) L1, width ( In FIG. 1, the length is W1) in the direction perpendicular to the plane of the paper. The H1 is 3 to 8 cm. The L1 is 50-80 cm. The W1 is 4 to 9.2 cm. Of course, the conditions (L1>H1, W1>H1) are satisfied. The conditions (0<H1/L1<2.2, 0<H1/W1<6.8) are also satisfied. In one specific example, H1 = 3.2 cm, L1 = 79.2 cm and W1 = 9.2 cm.

The transport path 2 is a transport path arranged in the vertical direction. The transportation path 2 is connected to one end on the upstream side of the transportation path 1 . The transport path 3 is a transport path arranged in the vertical direction. The transport path 3 is connected to one end of the transport path 1 on the downstream side. The transportation paths 2 and 3 may have any shape, whereas the transportation path 1 has a flat box shape. A flat box shape or a round tube shape may be used. In this embodiment, the transportation paths 2 and 3 are round pipes.

A cooling mechanism (not shown) is provided in the transport path 2 . Pressure is applied to the container B (not shown) (pressurization is achieved by introducing an inert gas), and when the liquid 4 in the container B is extruded (transported) into the transport path 2, the transport path 2 is cooled. Therefore, it is difficult for the inert gas to dissolve in the liquid 4 transported through the transport path 2 .

5 is an exhaust port provided on the top surface of the transport path 1 . A vacuum pump (not shown) is connected to the exhaust port 5 .

In the apparatus described above, an inert gas was introduced into vessel B (not shown). The inside of the container B was pressurized by this. Liquid 4 in container B was transported to transport path 2 . In this example, the transportation speed of liquid 4 was 0.67 L/min. The transportation speed was calculated from the filling amount of the liquid 4 in the container A and the filling time. From the relationship between the transport amount of the liquid 4 and the shape of the transport path 1 (H1 = 3.2 cm, L1 = 79.2 cm, W1 = 9.2 cm), the thickness (depth ) H is 0.5 cm. Therefore, H/W1 (W=W1)=0.054. A vacuum pump (not shown) was activated to evacuate the gas from the transport paths 1 and 3 . The degree of vacuum is about 6.5 Kpa from the performance of the vacuum pump.

The depth of the liquid 4 transported (passed) through the transport path 1 is very shallow. Therefore, the gas dissolved in the liquid 4 being transported (passed) through the transport path 1 was smoothly released into the gas phase. The liquid 4 in the transport path 3 fell along the inner wall of the transport path 3 . Therefore, the liquid 4 at this stage was in a thin film state. In addition, the liquid 4 falling along the inner wall of the transport path 3 seemed to be twisted. It seemed as if stirring was taking place. Also in the transport path 3, the gas dissolved in the liquid 4 was effectively degassed.

A liquid 4 was filled in a container B having the same volume as the cylindrical cylinder 13 (with an internal volume of 0.01 m ³ ) in FIG. At this filling stage, the removal of the dissolved gas contained in the liquid 4 is completed. The time required for filling was 10 minutes. It can be seen that the time is greatly shortened compared to the time described in the conventional example.

FIG. 2 is a graph showing the relationship between the internal pressure of the container and the temperature after the container A is filled with the liquid for which the dissolved gas removal operation has been performed according to the above-described embodiment. ● indicates the internal pressure in the case of the above embodiment, and ■ indicates the theoretical vapor pressure of the same liquid. The fact that both are almost the same indicates that the dissolved gas is sufficiently removed.

1, 2, 3 Transport path 4 Liquid 5 Exhaust port

Claims (15)

A device for reducing the amount of dissolved gas in the liquid in cylinder A to a reference value or less,
The device comprises a transport path through which the liquid in the container B is transported into the cylinder A,
A decompression chamber is configured in the transport path extending in a substantially horizontal direction in the transport path,
The transport path extending in the substantially horizontal direction in the decompression chamber,
The average depth H of the liquid transported through the transport path is 0.5 cm to 0.3 m, and the average width W of the liquid transported through the transport path is 4 cm or more. It is configured so that things can be done,
3. Devices where 8≦W/H . The transport path extending in the substantially horizontal direction in the decompression chamber,
The average depth H of the liquid transported in the transport path is 0.5 cm to 3 cm, and the average length W in the width direction of the liquid transported in the transport path is 4 cm or more. 10. The apparatus of claim 1 , configured to : The transport path further includes a vertical transport path connected to the exit side end of the transport path extending in the substantially horizontal direction, and connected to the entrance side end of the transport path extending in the substantially horizontal direction. 3. The apparatus of claim 1 or claim 2, further comprising a vertical transport path. The inner shape of the decompression chamber is a substantially flat box shape,
An average length L1 in the transport direction of the transported liquid in the substantially flat box-shaped decompression chamber, an average length W1 in the width direction substantially orthogonal to the transport direction in the substantially flat box-shaped decompression chamber, and the substantially flat box-shaped decompression chamber 4. The device according to any one of claims 1 to 3, wherein the average depth H1 of the transported liquid in the liquid-transporting device satisfies L1>H1 and W1>H1. 5. The apparatus of claim 4, wherein L1 is 13 cm or more, W1 is 4 cm or more, and H1 is 0.5 cm to 0.3 m. 0<H/S (H is the average value of the depth of the liquid transported in the decompressed chamber, and the unit is cm. S is the interface area between the liquid transported in the depressurized chamber and the gas phase, and the unit is cm ² .)<0.039 cm ⁻¹ . The apparatus according to any one of claims 1 to 6, further comprising a container B connected to said transport path . The apparatus according to any one of claims 1 to 7, further comprising a cylinder A connected to said transport path . The device is a device used when the liquid in the container B is filled into the cylinder A,
7. The device according to any one of claims 1 to 6, wherein the amount of gas dissolved in the liquid is below a reference value during said filling operation. further comprising a gas supply device and a cooling device,
The gas supply device is for transporting the liquid,
The apparatus according to any one of claims 1 to 9, wherein said cooling device is for cooling said transport path. A method for reducing the amount of dissolved gas in liquid in cylinder A to a reference value or less,
The liquid in the cylinder A is transported from the container B,
During the transportation, the liquid is controlled to have an average depth of 0.5 cm to 0.3 m,
The average depth of the liquid is 0.5 cm to 0.3 m, and 3.8 ≤ width (average length in the width direction of the liquid during transportation) W / depth (depth of the liquid during transportation) ), wherein the liquid is subjected to a vacuum treatment at a point H) . During the transport, the liquid is controlled to have an average depth of 0.5 cm to 3 cm,
The average depth of the liquid is 0.5 cm to 3 cm, and 3.8 ≤ width (average length in the width direction of the liquid during transportation) W / depth (average depth of the liquid during transportation) 12. The method of claim 11 , wherein at depth H) the liquid is subjected to a vacuum treatment . A method used when the liquid in container B is filled into cylinder A,
13. The method according to claim 11 or 12, wherein the amount of gas dissolved in the liquid is below a reference value during said filling operation. 14. The method according to any one of claims 11 to 13, wherein the transport path for transporting the liquid in container B into cylinder A is cooled. The method according to any one of claims 11 to 14,
The method is processed using the apparatus according to any one of claims 1 to 10.

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