JP2000009288A - Manufacture and storage method and pipe coupling structure for polymeric liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing and storing method for and a pipe cou pling structure for a polymeric liquid that cause least unplanned polymerization. SOLUTION: A manufacturing method for a polymeric liquid uses an equipment nozzle 1 connecting to the interior of equipment handling the polymeric liquid. The equipment nozzle 1 comprises a nozzle base 11 and a flange part 12. The nozzle base 11 is a tubular body connected to the equipment interior. The flange part 12 is a tubular body of the same inside diameter as the nozzle base 11, and includes a flange 121 at its point and connects at the other end to the point of the nozzle base 11. The nozzle base 11 and the flange part 12 are butt-welded together such that there appears no unevenness in the internal surface of the connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a polymerizable liquid.
The present invention relates to a storage method and a pipe fastening structure used for producing and storing a polymerizable liquid. More specifically, the present invention relates to a method for producing and storing a polymerizable liquid that hardly causes polymerization of a polymerizable liquid at a pipe fastening portion and a measuring device attachment portion, and a pipe fastening structure. In this specification, “production / storage” is a concept including “production”, “storage”, and “production / storage”.

[0002]

2. Description of the Related Art Conventionally, in equipment used for producing and storing a polymerizable liquid, an apparatus nozzle is provided for supplying or extracting the polymerizable liquid or the like. Further, a mounting member for mounting a measuring device for measuring a state inside the manufacturing device is provided, and the measuring device is inserted inside the manufacturing device. These device nozzles, attachment members, etc. were such that a pipe was attached to the device body by welding, and a flange was provided at the tip. This flange is used to connect the pipe and the device nozzle or to fix the measuring device to the mounting member. Furthermore, when connecting the flange on the side of the equipment nozzle and the flange on the side of the pipe, and connecting the flanges of the pipes, a donut plate-shaped gasket is used between the flanges. I was

On the other hand, polymerizable liquids are known to polymerize during the manufacturing process, storage or transportation due to factors such as heat, light, lack of a polymerization inhibitor, and the incorporation of a polymerization accelerator, which often causes troubles. ing. As a method for preventing such polymerization, a polymerization inhibitor such as an aromatic amine such as thiodiphenylamine or a phenolic compound such as hydroquinone or a derivative thereof may be used, or polymerization may be performed by contact with an oxygen-containing gas. It is known that it is effective to manage so that oxygen dissolved in the ionic liquid is not deficient,
And it is widely adopted.

[0004] In addition, contamination of polymerization equipment (metal such as iron and its ions, polymer sludge, etc.) due to corrosion of equipment handling the polymerizable liquid or entrainment from outside (hereinafter referred to as "contamination"). Also causes polymerization trouble. As a measure for preventing such polymerization, it is known that it is effective to use a corrosion-resistant material for equipment and to prevent contamination from outside, and it is widely adopted.

[0005]

However, relatively small irregularities and gaps are present on the inner surface of the equipment, such as the inside of the equipment nozzle and the mounting member as described above, and the connection between the equipment nozzle and the pipe or the connection between the flanges of the pipes. The polymerizable liquid tends to stay in the recesses and gaps in the portion having In such a staying polymerizable liquid, the polymerization preventing method using a polymerization inhibitor does not provide a sufficient effect. That is, in the polymerizable liquid staying in the concave portions and the gaps, the polymerization inhibitor and dissolved molecular oxygen are gradually consumed, and the polymerization inhibitor becomes deficient, and polymerization occurs.

[0006] When a polymer is generated in a portion of the nozzle or the like having irregularities or gaps or a polymer or sludge accumulates due to the above-mentioned causes, it triggers the polymerization in the nozzle portion to be further promoted. become. Then, the grown polymer blocks not only the inside of the nozzle or the like but also the entire inside of the device. For this reason, in a device that handles a polymerizable liquid, it is necessary to periodically stop the device and clean the inside of the device in order to prevent a large amount of polymer from accumulating.

The present invention is intended to solve such a problem, and is intended to manufacture and produce a polymerizable liquid which is unlikely to cause polymerization of a polymerizable liquid at a pipe fastening portion and a measuring device mounting portion.
An object is to provide a storage method and a pipe fastening structure.

[0008]

According to a first aspect of the present invention, there is provided a method for producing and storing a polymerizable liquid, wherein a tubular body connected to a device or a pipe for handling the polymerizable liquid has a structure having no portion where the polymerizable liquid stays. It is characterized by doing. In the method for producing and storing a polymerizable liquid according to the first aspect of the invention, since the tubular body connected to the device or the pipe has a structure that does not have a portion where the polymerizable liquid stays, the polymerizable liquid stays in the annular body. Does not cause polymerization.

A method for producing and storing a polymerizable liquid according to a second aspect of the present invention is a method for producing and storing a polymerizable liquid using a device nozzle 1 communicating with the inside of a device for handling the polymerizable liquid. A device nozzle base 11 which is a tubular body which is attached in communication with the inside of the device;
1 is a tubular body having an inner diameter equal to
And a flange portion 12 having the other end connected to the tip of the device nozzle base portion 11. The device nozzle base portion 11 and the flange portion 12 are connected by butt welding, and irregularities or A method for producing and storing a polymerizable liquid, which is welded so as not to form a gap.

[0010] Here, "piping" refers to a pipe such as a pipe through which a liquid or a gas passes, or a pipe through which a liquid or a gas exists inside an apparatus. Also, "equipment handling polymerizable liquid"
Is not limited to a complicated device, and may itself be a “pipe”. And, `` equipment nozzle '' is a pipe attached to the equipment or the like, or a measuring instrument that measures the internal state of the pipe or equipment in order to join or branch other pipes to the pipe or equipment. To connect
Including a tubular sheath attached to the device, etc.
Refers to a connection device.

FIGS. 5 and 6 show a conventional screw nozzle or socket type nozzle 1a which is a general nozzle configuration method.
As shown in (1), a gap V1 is formed between the end surface of the concave portion of the device nozzle base 11a into which the flange portion 12a is inserted and the end surface of the flange portion 12a. Therefore, the gap V1
The polymerizable liquid permeates into the gap, the polymerizable liquid stays inside the gap V1, and polymerization occurs.

However, in the method for producing and storing a polymerizable liquid according to the second aspect, the apparatus nozzle base 1 having the same inner diameter.
1 and the flange portion 12 are provided by butt welding,
The device nozzle 1 having a connection structure in which there is no unevenness on the inner surface of the connection portion is used. For this reason, the device nozzle base 1
There is no gap or recess on the inner surface of the connection between the flange 1 and the flange portion 12 which can occur in the case of a screw-in type or a socket type. Therefore, the polymerizable liquid does not stay in such concave portions,
Polymerization of the polymerizable liquid at the device nozzle can be effectively prevented.

A method for producing and storing a polymerizable liquid according to a third aspect of the present invention is a method for producing and storing a polymerizable liquid using a device nozzle 1 communicating with the inside of a device for handling the polymerizable liquid. A method for producing and storing a polymerizable liquid, characterized in that the polymerizable liquid is mounted to be inclined upward so as to have an upward slope along a tip portion from a connection portion to the device.

When a device nozzle in a gas phase having a closed end is attached to a device that handles a polymerizable liquid while being tilted horizontally or downward, the polymerizable liquid stays inside the device nozzle itself, and the polymerization is stopped. cause. However, claim 3
Since the device nozzle 1 used in the method for producing and storing a polymerizable liquid described above is attached to be inclined upward,
The polymerizable liquid that has entered the device nozzle 1 flows down into the device along the slope, and does not stay in the device nozzle 1. Therefore, according to the method for producing and storing a polymerizable liquid of the third aspect, polymerization of the polymerizable liquid in the device nozzle can be effectively prevented.

Here, the case where the tip of the device nozzle is closed is, for example, the case where the device nozzle is used as a member for mounting a thermometer on a device which handles a polymerizable liquid, or the case where a pressure gauge is mounted. And the like can be considered. Further, the device nozzle 1 according to the third aspect can prevent the error when applied as a member for mounting a measuring device, such as a pressure gauge, which tends to cause an error in a measured value due to adhesion of a polymer, particularly. .

According to a fourth aspect of the present invention, there is provided a method for manufacturing and storing a polymerizable liquid using a flange connection member 2 provided on a surface of an apparatus for handling the polymerizable liquid.
In the storage method, the flange connecting member 2 has a communication hole 21 extending from the upper surface of the flange connecting member 2 to the inside of the device.
And a bolt fixing hole 22 provided in a member forming an outer periphery of the communication hole 21 and having an internal thread cut in an inner surface thereof.

Here, the "upper surface of the flange connection member" is the upper side when the "flange connection member" attached to the device is placed above the main body of the "device handling the polymerizable liquid". Plane.

As shown in FIG. 5, an apparatus nozzle 1a used in a conventional method for producing and storing a polymerizable liquid is configured such that a pipe 11a is welded to an apparatus handling a polymerizable liquid, and another pipe 1a is welded.
2a, and a flange 121 for pipe connection is provided at the end thereof.
a was provided. The reason why the flange 121a is provided is that in order to connect the pipe to the apparatus nozzle 1a, a flange for inserting and fixing a bolt is required on both the pipe side and the apparatus nozzle side. The reason why the flange 121a is provided apart from the device surface via the pipes 11a and 12a is that the heads and tips of the bolts protrude from both outer sides of the flanges connected to each other.

However, when the instrument nozzle 1a is for mounting a measuring instrument or the like, and its tip is closed, the internal space of this pipe portion protrudes from the internal space of the apparatus for handling the polymerizable liquid. Thus, the polymerizable liquid stays and the liquid is not easily replaced in the internal space. As a result, there is a problem that oxygen and a polymerization inhibitor are insufficiently replenished in the relevant portion, and polymerization is likely to occur.

However, the flange connecting member 2 used in the production and storage of the polymerizable liquid according to the fourth aspect is provided so as to directly protrude from the surface of the device. Around the communication hole 21, a bolt fixing hole 22 having a female thread is provided, and the role of the flange 121a and the nut in the conventional device nozzle 1a is played around the communication hole 21 of the flange connection member. Of the member itself.

Therefore, the flange connection member 2 does not need to provide a space between the apparatus main body and the flange connection member, and the height of the flange connection member 2 can be reduced.
Therefore, the space in the communication hole 21 of the flange connection member 2 (corresponding to the space in the pipes 11a and 12a in the conventional device nozzle 1a) can be reduced. As a result, the stay of the polymerizable liquid in the space inside the flange connection member 2 can be reduced, and the polymerization of the polymerizable liquid inside the flange connection member 2 can be reduced. The flange connection member used in the production and storage of the polymerizable liquid according to claim 4 is particularly applied to a nozzle for mounting a pressure gauge, a liquid level gauge, and a thermometer having a closed end. It is effective.

A method for producing and storing a polymerizable liquid according to a fifth aspect of the present invention is a method for producing and storing a polymerizable liquid using an apparatus for handling the polymerizable liquid, wherein the apparatus, piping connected to the apparatus, A method for producing and storing a polymerizable liquid, characterized in that a connection member for connecting the pipe to the device is obtained by pickling an inner welded portion and a periphery thereof.

When each component is attached to a device handling a polymerizable liquid by welding, adhesion of scales and the like generated during welding to the welded portion and its surroundings and a change in the metal crystal structure in the surface layer occur. However, there is a problem that the polymerization is accelerated. In addition, when the surface is polished or machined to remove the scale, the passivation film on the metal surface is peeled off, and the metal surface accelerates polymerization. This problem of the nonconductive film is particularly remarkable in alloys such as stainless steel.

However, in the apparatus used in the method for producing and storing a polymerizable liquid according to the fifth aspect, the welded portion and its periphery are pickled, so that the scale adhered to the portion during welding is removed by pickling. In addition, the portion is uniformly passivated, and the polymerization of the polymerizable liquid caused by the portion is effectively prevented.

A method for producing and storing a polymerizable liquid according to a sixth aspect of the present invention is a method for producing and storing a polymerizable liquid using a measuring instrument 3 for measuring an internal state of a device for handling the polymerizable liquid. Is provided with a mounting member 2 for mounting the measuring instrument 3, the mounting member 2 has a communication hole 21 extending from the upper surface thereof to the inside of the device, and the measuring instrument 3 is provided with the communication hole 2. 21, and a fixing portion 31 for fixing the insertion portion 32 to the mounting member 2.
2 is provided with a detecting portion 321 at its tip for detecting the state inside the device. The shape of the insertion portion 32 is such that the insertion portion 32 is inserted into the communication hole 21. Closing the opening of the communication hole 21 inside the device,
A method for producing and storing a polymerizable liquid, characterized in that the shape is such that unevenness is not formed between the mounting member 2 and the end face on the device side.

Here, the "attachment member" includes an "equipment nozzle" (described in claim 3) and a "flange connection member" (described in claim 4) when used to attach a measuring instrument. Broadly, it refers to a member for attaching a measuring instrument for measuring the internal state of a device that handles a polymerizable liquid to the device.
Further, the “upper surface” of the mounting member is a surface that becomes the upper side when the “mounting member” attached to the device is placed above the main body of the “device that handles the polymerizable liquid”. And
“Closing” may mean that the communication hole is sealed, but the sealing in a strict sense is not always necessary.

The measuring instrument 3 used in the method for producing and storing a polymerizable liquid according to claim 6 closes the communication hole 21 of the mounting member 2 on the inner surface of the equipment for handling the polymerizable liquid, and makes the end face of the mounting member 2 uneven. Do not make For this reason, even if it is attached to a device that handles a polymerizable liquid, there is no uneven portion that causes the polymerizable liquid to stay inside the device, and there is no possibility of causing polymerization. If the mounting member 2 itself is also attached so that its end face does not form a stagnant portion with the inner surface of the device, both the mounting member 2 and the measuring instrument 3 do not form a stagnant portion on the inner surface of the device, thereby preventing polymerization. It is more preferable in this respect. Here, the "retaining portion" refers to a gap in a wall surface, a minute concave portion, a corner portion of irregularities, or the like in a device or the like that handles a polymerizable liquid, and refers to a portion where the polymerizable liquid stays and causes polymerization. .

According to a seventh aspect of the present invention, there is provided a method for producing and storing a polymerizable liquid, wherein the measuring device 3 is a diaphragm type measuring device, and the detecting section is a diaphragm type measuring device. 321 is a diaphragm.

Since the measuring device 3 used in the method for producing and storing a polymerizable liquid according to the present invention is a diaphragm type measuring device, the gas inside the device is measured in order to measure the state inside the device handling the polymerizable liquid. There is no need to draw liquid or liquid into the meter. Therefore, polymerization does not occur inside the measuring instrument 3 and is suitable for use in production and storage of a polymerizable liquid.

Also, the diaphragm type measuring device is a “diaphragm”
Is brought into contact with a liquid to be measured or a gas to be measured to perform measurement. Therefore, by providing a "septum" at the tip of the measuring instrument 3,
7. The "diaphragm" has a "shape that does not create irregularities between the inner surface of a device that handles a polymerizable liquid" and the other parts in accordance therewith.
1 "is easy. And, even with such a configuration, the measurement performance is not sacrificed.

According to the method for producing and storing a polymerizable liquid of the eighth invention, a plate-like gasket 8 having a hole 81 at the center is provided between flanges 6A and 6B connecting pipes 5A and 5B for flowing the polymerizable liquid. A method for producing and storing a polymerizable liquid to be sandwiched and used, wherein the gasket 8 is formed by connecting a pair of substantially plate-shaped contact portions 82 and 82 at the center thereof with the pair of contact portions 82 and 82 facing each other. A substantially cylindrical connecting portion 83 forming the hole 81 and a cushion portion 84 formed of an elastic member and sandwiched between the pair of contact portions 82, 82.
And the cross-sectional shape of the internal hole of the tube of the connecting portion 83 is the same as the cross-sectional shape of the internal hole of the pipes 5A and 5B to be connected, and the inner surface of the tube is flat. This is a method for producing and storing a polymerizable liquid.

Here, "face-to-face" with respect to a pair of contact portions means that the pair of contact portions are symmetric and parallel with respect to a certain plane. In addition, the “flange” here is provided so as to be able to face and connect with the “normal flange”, in addition to the “normal flange” provided so as to expand in the outer peripheral direction at the end of the pipe. It also includes other members. For example, a flange connection member according to claim 4 is also included. The “pipe” here is not limited to a “simple tubular object”, and may be a device that internally handles a polymerizable liquid.

The conventional gasket 8a is made by sandwiching a cushion member 84a between doughnut-shaped Teflon members formed by thinly cutting a Teflon pipe. For this reason, the thickness in the vicinity of the center hole 81a was smaller than that in the vicinity of the outer periphery of the gasket by the thickness of the cushion member 84a. Therefore, this gasket 8a is
7A and 6B, the flanges 6A and 6A face each other at a distance near the center hole 81a of the gasket and at a thickness near the outer periphery of the gasket as shown in FIG.
A gap V2 was formed between B and B. There is a problem that the polymerizable liquid stays in the gap V2 to cause polymerization.

However, in the gasket 8 used in the method for producing and storing a polymerizable liquid according to the eighth aspect, a pair of substantially plate-shaped contact portions 82 are connected by a cylindrical connection portion 83.
A cushion portion 84 is arranged between the contact portions 82. Therefore, the thickness of the gasket can be made uniform from the inner circumference to the outer circumference. The cross-sectional shape of the internal hole of the cylinder of the connection portion 83 is equal to the cross-sectional shape of the internal hole of the pipes 5A and 5B to be connected, and the inner surface of the cylinder is provided flat.

Therefore, even when the gasket 8 is used sandwiched between the flanges 6A and 6B, if the internal holes of the pipes 5A and 5B and the internal holes of the connecting portion 83 are used in alignment, the pipes 5A and 5B are used. No stagnant portion is formed on the inner surface at the connection portion (gasket 8 portion). Therefore, the polymerizable liquid does not stay in the gaps and the concave portions, and the polymerization is unlikely to occur in the production and storage of the polymerizable liquid.

According to a ninth aspect of the present invention, there is provided a method for producing and storing a polymerizable liquid, wherein the gasket 8 has a disk shape.
The center hole 81 is a circular hole. The circular hole is provided so as to coincide with the center of the outer peripheral circle of the gasket 8, and the diameter of the outer peripheral circle of the gasket 8 is "(the flange 6B Draw a circle around the center axis of the flange 6B
Of the plurality of bolt insertion holes 62B provided in the hole, the diameter of a circle drawn by the center of the hole) + (the diameter of the bolt insertion hole 62B) −
(Diameter of the bolt 7A inserted into the bolt insertion hole 62B)
× 2 ”.

The conventional gasket 8b has an outer diameter that fits inside a plurality of bolts arranged in a circle on the flange. That is, it is smaller than the size that contacts the inside of the facing bolt. For this reason, even if the center of the flange is aligned, the position often shifts inside the area surrounded by the bolt before being firmly sandwiched between the flanges by the bolt. As shown in FIG. In many cases, a step was formed between the inner surface of the center hole 8b and the inner surface of a pipe or the like connected by a flange.

As shown in FIG. 8, a gasket 8b having an inner diameter larger than the inner diameter of a pipe or the like is selected so as to prevent the gasket 8b from partially protruding into the pipe due to such a displacement. It had been. Therefore, even when the deviation from the center was small, the gasket portion had a depression over the entire circumference. Even at these steps and dents, the polymerizable liquid stayed and polymerization was easily caused.

However, in the gasket 8 used in the method for producing and storing a polymerizable liquid according to the ninth aspect, the outer diameter of the disk shape is ((diameter of a circle drawn by the center of the bolt insertion hole) + (bolt insertion hole). (Diameter of bolt) − (diameter of bolt) × 2 ”.
For this reason, when it is arranged on the flange 6B, its outer periphery is inside the bolt 7A inserted into each of the plurality of bolt insertion holes 62B of the flange 6B (the inside of the circle of the bolt 7A arranged in a circle). ), And the installation position on the flange 6B is defined by the plurality of bolts 7A. At this time, each bolt 7A is in contact with the inner wall on the outer peripheral side of the flange 6B in each bolt insertion hole 62B.

The bolt insertion hole 62 of the flange 6B
Since B is arranged so as to draw a circle having the same center as the center axis of the flange 6B, the gasket 8 is arranged in a state where the center of the outer circumferential circle is aligned with the center axis of the flange 6B.
Its position is defined. Here, the pipe is usually a circular pipe, and the flange is connected to the pipe such that the center axis of the pipe to be connected coincides with the center axis of the self (flange). Accordingly, the center axis of the pipe 5B coincides with the center axis of the flange 6B, and the center of the outer circumferential circle of the gasket 8 coincides with the center axis of the pipe 5B.

On the other hand, the circular hole 81 at the center of the gasket 8 is also
The gasket 8 is provided in such a manner that the center of the outer peripheral circle thereof coincides with the center. Therefore, when the position of the gasket 8 is defined by the bolt 7A, the center axis of the pipe 5B coincides with the center of the circular hole 81 (the internal hole of the connection portion 83) at the center of the gasket 8. Further, the cross-sectional shape of the internal hole of the connecting portion 83 of the gasket 8 and the cross-sectional shape of the internal hole of the pipe 5B to be connected are provided so as to match. Therefore, the connection between the internal hole of the pipe 5B and the hole 81 of the gasket 8 (the internal hole of the connecting portion 83) is made to coincide with each other only by a normal fastening operation using the bolt 7A without adjusting the position of the gasket. Can not be recessed on the inner surface.

What has been described above also applies to the relationship between the flange 6A, the pipe 5A, and the gasket 8. Therefore, no irregularities are formed on the inner surface at the connection portion of the pipes 5A and 5B by the gasket 8. Therefore, in the production and storage of the polymerizable liquid, the polymerization due to the stagnation of the polymerizable liquid hardly occurs.

A pipe fastening structure according to a tenth aspect of the present invention comprises a pair of flanges 6A and 6B for connecting pipes 5A and 5B for flowing a polymerizable liquid, and a bolt for fixing the pair of flanges 6A and 6B to face each other. 7A and a nut 7B,
And a plate-like gasket 8 having a hole 81 in the center and used between the pair of flanges 6A and 6B.
Have bolt insertion holes 62A and 62B having the same inner diameter for inserting the bolt 7A at corresponding positions, and the bolt 7A is provided with the bolt insertion holes 62A and 62B.
And the nut 7B is fixed to the pair of flanges 6A and 6B together with the nut 7B. The gasket 8 includes a pair of substantially plate-shaped contact portions 82 and 82, and the pair of contact portions 82 and 82.
A substantially cylindrical connecting portion 83 which is connected to the central portion of the contact portion 82 so as to form the hole 81; a cushion portion 84 which is formed of an elastic member and is sandwiched between the pair of contact portions 82; Wherein the cross-sectional shape of the internal hole of the cylinder of the connecting portion 83 is the same as the cross-sectional shape of the internal hole of the pipes 5A and 5B to be connected, and the inner surface of the cylinder is flat. It is a structure.

In the pipe fastening structure according to the tenth aspect, if the internal holes of the pipes 5A and 5B and the internal holes of the connecting portion 83 are used in alignment with each other, the connecting portion (gasket 8 portion) of the pipes 5A and 5B is used. No irregularities are formed on the inner surface. Therefore, the polymerizable liquid does not stay in the gaps and the concave portions, and the polymerization is unlikely to occur in the production and storage of the polymerizable liquid. In the pipe fastening structure according to the tenth aspect, since the bolt insertion holes 62A and 62B of the flanges 6A and 6B to be combined have the same inner diameter, the bolts 7, 7,.
A and 62B equally contact the outer surfaces of the flanges, and the posture is defined in parallel with the central axes of the flanges 6A and 6B and the pipes 5A and 5B, so that the position of the gasket 8 is more reliably specified.

An eleventh aspect of the present invention is a pipe fastening structure.
0, wherein the pipes 5A, 5B
Has a circular cross section, the gasket 8 has a disk shape, and a central hole 81 of the gasket 8 is a circular hole. The bolt insertion holes 62
A and 62B are provided on the pair of flanges 6A and 6B in a circle around the center axis of each of the flanges 6A and 6B, and the diameter of the outer peripheral circle of the gasket 8 is “( The diameter of the circle drawn by the center of the bolt insertion hole 62B) + (the diameter of the bolt insertion hole 62B) −
(Diameter of the bolt 7A inserted into the bolt insertion hole 62B)
× 2 ”.

According to the pipe fastening structure according to the eleventh aspect, no stagnation portion is formed on the inner surface of the connection portion between the pipes 5A and 5B by the gasket 8. Therefore, in the production and storage of the polymerizable liquid, the polymerization due to the stagnation of the polymerizable liquid hardly occurs.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Production of the polymerizable liquid of the present invention
The device nozzle 1 used in the storage method includes a device nozzle base 11 and a flange portion 12, as shown in FIG.
The device nozzle base 11 is a tubular body, and is attached so that its internal hole communicates with the device T that handles the polymerizable liquid. The flange portion 12 is a tubular body having the same inner diameter as the device nozzle base 11, has a flange 121 at the tip, and the other end is connected to the tip of the device nozzle base 11.
The device nozzle base 11 and the flange portion 12 are connected by butt welding, and are welded so that no stagnation portion is provided on the inner surface of the connection portion. Further, as shown in FIG. 1, the device nozzle 1 is attached to be inclined upward such that the tip thereof is higher than a portion connected to the device T.

In the method for producing and storing a polymerizable liquid according to the present invention, the following flange connecting member 2 is also used.
That is, as shown in FIG.
The upper end surface is a cylindrical flange connection member 2 provided flat. The flange connection member 2 has a communication hole 21 extending from the upper surface to the inside of the device, and a plurality of bolt fixing holes 22, 2 provided around the communication hole 21 so as to draw a circle centered on the center of the communication hole 21.
2, and are provided. Female screws are cut in these bolt fixing holes 22, respectively.

The device T of the flange connection member 2
The end surface on the side exposed on the inner surface of the device T is provided in a concave shape so as to match the inner curved surface of the device T so as not to protrude from the inner surface of the device T. Both the device nozzle 1 and the flange connection member 2 described above have their pickled portions and their periphery subjected to pickling.

The following diaphragm type pressure gauge 3 is attached to the flange connecting member 2. That is, as shown in FIG. 2, the diaphragm type pressure gauge 3 includes a substantially disk-shaped fixing portion 31 and a substantially columnar insertion portion 3 erected at the center of the disk.
Consists of two. The fixing portion 31 is a disk having an outer diameter substantially the same as the outer diameter of the flange connecting member 2, and has bolt insertion holes at positions corresponding to the bolt fixing holes 22, 22,. . And the insertion part 32
Has an outer diameter that is substantially the same as the inner diameter of the communication hole 21 of the flange connection member 2, and is just inserted into the communication hole 21 of the flange connection member 2. The length of the insertion portion 32 is the same as the length of the communication hole 21, and the shape of the distal end 32 t of the insertion portion 32 is set together with the end face of the flange connection member 2 in a state where the insertion portion 32 is completely inserted into the communication hole 21. They are provided flat so as to form the same plane.

At the tip 32t, a diaphragm 321 is stretched. The diaphragm 321 transmits pressure to the inside of the diaphragm type pressure gauge 3, and the pressure inside the device T is detected. As shown in FIG. 2, a tube 33 that transmits this pressure is connected to a surface of the fixing portion 31 opposite to a surface to which the insertion portion 32 is connected. As shown in FIG. 2, the diaphragm type pressure gauge 3 is mounted so as to fit into the communication hole 21 of the flange connection member 2. Then, the bolt insertion hole provided in the fixing portion 31 and the bolt fixing hole 22 of the flange connection member 2,
The diaphragm type pressure gauge 3 is fixed to the flange connection member 2 by matching the 22, 22,.

On the other hand, in the method for producing and storing a polymerizable liquid according to the present invention, the following gasket is used in a portion where pipes are connected by flanges. That is, as shown in FIG. 4, a gasket 8 is used between the flange 6A and the flange 6B at a portion where the pipe 5A and the pipe 5B are connected by the flange 6A, the flange 6B, the bolt 7A, and the nut 7B.

In FIG. 4, the pipes 5A and 5B are pipes having the same inner diameter and the same wall thickness. And flange 6A
Has a center hole for inserting and fixing the pipe 5A at the center thereof, and has bolt insertion holes 62A and 62 provided so as to draw a circle having the same center as the center of the center hole.
A,. The flange 6A is connected to the pipe 5
A is connected to the end of the pipe 5A such that the central axis of A coincides with the center of the flange 6A. Similarly, flange 6
B is also configured, and the flange 6B is connected to the end of the pipe 5B. The flange 6A and the flange 6B are
They are arranged facing each other with the gasket 8 interposed therebetween, and are fixed to each other by bolts 7A and nuts 7B penetrating the corresponding bolt insertion holes 62A and 62B.

The gasket 8 is a disk-shaped gasket having a hole 81 at the center, as shown in FIGS.
A pair of contact portions 82, 82 in the form of a Teflon donut plate
And a cylindrical connecting portion 83 which forms the central hole 81 by connecting the contact portions 82 and 82 to each other at the center thereof, and a cushion which is formed of an elastic member and is sandwiched between the pair of contact portions. And part 84. As shown in FIG. 4, the inner surface of the cylindrical connecting portion 83 is formed flat, and the pair of contact portions 82, 82 and the connecting portion 83 are substantially “U” opened toward the outer periphery of the gasket as a whole. A cross-section in the shape of a letter is formed. Further, the cushion portion 84
An outer gasket portion 841 forming a substantially “U” -shaped cross section that opens toward the gasket outer peripheral side, and a core portion 842 arranged in the “U” -shaped recess of the outer gasket portion 841
Consists of

The outer diameter of the gasket 8 is given by "(diameter of circle drawn by the center of bolt insertion holes 62A and 62B) + (diameter of bolt insertion holes 62A and 62B)-(diameter of bolt 7A)".
× 2 ”. Therefore, when the gasket 8 is arranged inside the bolts 7A, 7A,... Inserted in the bolt insertion holes 62A, 62B arranged in a circle, as shown in FIG. The position of the hole 81 of the gasket 8 is defined by the pipes 5A, 5A,
5B coincides with the center of the internal hole. At that time, each bolt 7
A, 7A,... Are in contact with the inner wall outside the flange in the bolt insertion holes 62A, 62B.

The diameter of the hole 81 of the gasket 8 is
It is provided so as to be equal to the inner diameter of the pipes 5A and 5B. For this reason, the gasket 8 is connected to the bolts 7A, 7A.
When it is arranged between the flange 6A and the flange 6B with the position defined by A,..., There is no unevenness on the inner surface from the pipe 5A to the gasket 8 and the pipe 5B.

The "equipment T for handling a polymerizable liquid" used in the present invention includes a product tank, a raw material tank, an intermediate product tank, a separation tank, and a reactor used when producing, storing and transporting the polymerizable liquid. And the like, such as storage tanks and reactors, and rectification towers, absorption towers, stripping towers, extraction towers, heat exchangers and the like used when producing polymerizable liquids.

The "equipment nozzle 1", "flange connection member 2", and "attachment member 2" used in the present invention are used for extracting a polymerizable liquid or a vapor of the polymerizable liquid. Nozzles for supply of steam, mounting of sensors such as a thermometer, a pressure gauge, a liquid level gauge, etc., for manholes, for sight glass for observing the inside of equipment, for preliminary use, for inspection, and the like.

Then, the device nozzle 1 used in the present invention
As a method of “butt welding”, a normal welding method is applied, and preferably, TIG welding or MIG welding (points for selecting a new version of welding material in the JIS usage series) Editor-in-chief Minoru Kobayashi Japan Standards Association Press 24, 17
Page) is used.

For a nozzle (attachment member) for attaching a sensor or the like and a general small-diameter nozzle for extracting or supplying a polymerizable liquid, welding from the inside is difficult.
Although a back side welding method of one side welding is performed, it is preferable to minimize irregularities in the width and height of the back side welding. For a large-diameter nozzle for extracting or supplying manhole or vapor of the polymerizable liquid, both-side welding can be performed. When performing one-sided welding, replacing the nozzle to be installed and the inside of the equipment with the shielding gas used for welding,
Performing welding while blowing shielding gas into the nozzle and the inside of the device is an effective means for preventing oxidation of the first layer welding surface.

As the “pickling” method used in the present invention, a passivation treatment method (Stainless Steel Welding Standards, page 47, published by The Stainless Steel Association) is used. Finishing with "nitric acid + hydrogen fluoride" not only improves the corrosion resistance due to the passivation of the equipment surface, but also prevents the remaining of iron powder on the surface and the remaining of active parts on the metal surface. become. Therefore, elution of heavy metals such as iron from these portions can be suppressed, and polymerization inside the handling equipment and heavy metal contamination of products can be prevented.

Other "welding" items such as groove processing, jigs and fixtures, cleanliness, strain prevention, selection of welding rods, shielding gas, pretreatment, preheating, welding procedures, welding conditions, post-treatment, and surface treatment The construction method such as inspection and inspection follows the general construction method described in the above-mentioned literature.

As the material of the "device nozzle 1" and the "flange connection member 2" used in the present invention, a material having corrosion resistance to the polymerizable liquid to be handled is employed. The “equipment nozzle 1” attached to the equipment in the present invention can prevent the polymerizable liquid from staying inside the nozzle by being installed so as to be inclined with respect to the horizontal direction as shown in FIG. it can. In addition, by having a slope, it is possible to prevent sludge and polymer contained in the polymerizable liquid to be handled or generated inside the device from being deposited. This angle depends on physical properties such as viscosity and surface tension of the polymerizable liquid handled,
It depends on the difficulty of welding, but it is preferable to keep it within 30 degrees.

The “polymerizable liquid” that can be handled according to the present invention has a vinyl group, and includes any compound as long as it is a polymerizable compound. , Acrylonitrile, (meth) acrylic acid, methyl (meth) acrylate, (meth)
Ethyl acrylate, propyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate,
Monofunctional or polyfunctional alkyl, cycloalkyl and alkylaminoalkyl esters of (meth) acrylic acid such as dimethylaminoethyl (meth) acrylate, ethylene glycol di (meth) acrylate and glycerin tri (meth) acrylate Or various liquids containing these polymerizable liquids.

In the present invention, a polymerization inhibitor may be used in the same manner as in the prior art for handling a polymerizable liquid. Examples of the polymerization inhibitor used include polymerization inhibitors such as aromatic amines such as thiodiphenylamine and phenol compounds such as hydroquinone and derivatives thereof, which are generally used when handling a polymerizable liquid. Can be

Oxygen is also widely used as a polymerization inhibitor. Oxygen dissolved in the polymerizable liquid has a great effect as a polymerization inhibitor, and can be operated under an atmosphere of an oxygen-containing gas or by introducing an oxygen-containing gas into the polymerizable liquid. By performing bubbling (aeration), dissolved oxygen introduced into the polymerizable liquid effectively works as a polymerization inhibitor. Here, the gas containing oxygen used for dissolving oxygen is
Although not particularly limited, when the oxygen concentration is high such as air, the possibility of forming an explosive mixed gas (detonation gas) increases, so the oxygen concentration is reduced to 21% by volume (air).
It is preferable to suppress it to the following. When the oxygen concentration is lower than 3% by volume, the oxygen partial pressure decreases and a high dissolved oxygen concentration is difficult to obtain, so the oxygen concentration is preferably 3% by volume or more.

[0067]

The present invention will be described below in detail with reference to examples. (1) Example 1 The equipment nozzle (150A) of the heat exchanger for heating and evaporating acrylic acid under reduced pressure was a socket type. In the equipment nozzle, a trouble that the nozzle was blocked due to polymerization frequently occurred. Therefore, when the device nozzle was changed to butt welding and pickling was performed, polymerization trouble at the device nozzle was eliminated.

(2) Example 2 A stainless steel (SUS30) for purifying butyl acrylate
4) In the rectification tower, the 40 A nozzle to which a thermometer for measuring the temperature of the middle stage of the rectification tower was a horizontally mounted socket type nozzle. There was a problem that the nozzle was blocked by polymerization. Then, the equipment nozzle was inclined upward by 20 degrees with respect to the horizontal direction, and the pickling was performed by changing the connection from the socket type to the butt welding. As a result, polymerization trouble at the equipment nozzle was eliminated.

(3) Example 3 In a stainless steel (SUS304) intermediate tank for temporarily storing crude methyl acrylate containing methyl acrylate, a pressure gauge for measuring the pressure is attached.
The nozzle of A was a socket type nozzle mounted horizontally. Then, in the nozzle, two months after the storage of the crude methyl acrylate, the trouble of clogging due to polymerization occurred. Then, when the apparatus nozzle was a flange connection member as described above (see FIG. 2) and the pressure gauge was a diaphragm type pressure gauge as shown in FIG. 2, polymerization trouble at the apparatus nozzle was eliminated.

(4) Example 4 In a stainless steel (SUS304) intermediate tank for temporarily storing crude methyl acrylate containing methyl acrylate, the gasket used for the pipe connection has an outer diameter of the flange. It was provided smaller than the inner size of the plurality of bolts arranged in a circle. Also, the inner diameter was larger than the inner diameter of the pipe. Then, in the pipe connection, a trouble occurred in which the polymerization was blocked several months after the crude methyl acrylate started to be stored. Then, when the gasket was a gasket having the above inner diameter and outer diameter and having a smooth inner surface (see FIG. 3), the polymerization trouble at the pipe connection portion was eliminated.

[0071]

According to the method for producing / storing a polymerizable liquid and the piping fastening structure of the present invention, polymerization / polymerization of the polymerizable liquid at an unexpected location is less likely to occur in the production / storage of the polymerizable liquid.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a butt-welded device nozzle inclined upward with respect to the horizontal direction.

FIG. 2 is an explanatory view showing a cross section of a flange connection member provided in a convex shape on a device surface and a pressure gauge attached to the flange connection member.

FIG. 3 is an explanatory diagram showing a positional relationship between a gasket arranged on a flange and a bolt inserted into a bolt hole.

FIG. 4 is a sectional view of a pipe connection portion connected by bolting of a flange.

FIG. 5 is a sectional view of a conventional device nozzle.

FIG. 6 is a sectional view of a connection portion of a conventional device nozzle.

FIG. 7 is a cross-sectional view of a pipe connection using a conventional gasket.

FIG. 8 is a cross-sectional view of a pipe connection using a conventional gasket.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Equipment nozzle, 11; Equipment nozzle base, 12; Flange part, 121; Flange, T; Equipment which handles a polymerizable liquid, 2; Flange connection member, 21; Communication hole, 22; Bolt fixing hole, 3; Pressure gauge, 31; fixed part,
32; insertion portion, 32t; tip of insertion portion, 321;
33; Tube, 4; Bolt, 5A; Piping, 5B; Piping, 6A; Flange, 6B; Flange, 62A; Bolt insertion hole, 62B; Bolt insertion hole, 7A; Bolt, 7B;
Nut, 8; gasket, 81; hole, 82; contact portion, 8
3; connection part, 84; cushion part, 841; outer gasket part, 842; core part.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // C07B 61/00 63/00 (72) Inventor Soichi Nomura 23 Azai Higashi, 17-17 Showa-cho, Minato-ku, Nagoya-shi, Aichi Synthetic Co., Ltd. Nagoya factory F-term (reference) 3H013 BA08 3H016 AA02 AC01 AD02 AD05 4H006 AA01 AA04

Claims (11)

[Claims] 1. A method for producing and storing a polymerizable liquid, wherein a tubular body connected to a device or a pipe for handling the polymerizable liquid has no structure in which the polymerizable liquid stays. 2. A method for producing and storing a polymerizable liquid using an apparatus nozzle 1 communicating with the inside of an apparatus that handles a polymerizable liquid, wherein the apparatus nozzle 1 is a tubular body that is attached in communication with the inside of the apparatus. A device nozzle base 11 and a tubular body having the same inner diameter as the device nozzle base 11,
And a flange portion 12 having the other end connected to the tip of the device nozzle base 11. The device nozzle base 11 and the flange portion 12 are connected by butt welding, and irregularities are formed on the inner surface of the connection portion. A method for producing and storing a polymerizable liquid, wherein the method is performed so as to provide no gap. 3. A method for producing and storing a polymerizable liquid using a device nozzle 1 communicating with the inside of a device that handles a polymerizable liquid, wherein the device nozzle 1 extends from a portion connected to the device to a tip portion. A method for producing and storing a polymerizable liquid, wherein the polymerizable liquid is mounted to be inclined upward so as to have an upward slope. 4. A method for producing and storing a polymerizable liquid using a flange connecting member 2 protrudingly provided on a surface of a device for handling a polymerizable liquid, wherein the flange connecting member 2 is A polymerizer comprising: a communication hole 21 extending from the upper surface to the inside of the device; and a bolt fixing hole 22 provided in a member forming an outer periphery of the communication hole 21 and having an internal thread cut in the inner surface. Production and storage methods for ionic liquids. 5. A method for producing and storing a polymerizable liquid using an apparatus that handles a polymerizable liquid, wherein the apparatus, a pipe connected to the apparatus, and a connection member connecting the pipe to the apparatus include: A method for producing and storing a polymerizable liquid, characterized in that a welded portion on the inner surface and its periphery are pickled. 6. A method for producing and storing a polymerizable liquid using a measuring device 3 for measuring an internal state of a device for handling a polymerizable liquid, the method comprising: mounting the measuring device 3 on the device. A member 2 is provided, the mounting member 2 has a communication hole 21 extending from the upper surface to the inside of the device, the measuring device 3 includes an insertion portion 32 inserted into the communication hole 21,
A fixing portion 31 for fixing the insertion portion 32 to the mounting member 2,
The insertion section 32 has a detection section 321 for detecting a state inside the device at a tip thereof,
The shape of the insertion portion 32 is such that the insertion portion 32 is
And a shape in which the communication hole 21 is closed so as to close the opening of the communication hole 21 inside the device, so that no irregularities are formed between the mounting member 2 and the end surface on the device side. Production and storage methods for ionic liquids. 7. The method for producing and storing a polymerizable liquid according to claim 6, wherein said measuring device 3 is a diaphragm type measuring device, and said detecting section 321 is a diaphragm. 8. Pipes 5A and 5B for flowing a polymerizable liquid.
A method for producing and storing a polymerizable liquid using a plate-like gasket 8 having a hole 81 in the center between flanges 6A and 6B connecting the gasket, the gasket 8 comprising a pair of substantially plate-like gaskets. Contact portions 82, 82
A pair of contact portions 82, 82, which face each other and are connected at the center to form the hole 81; a substantially cylindrical connecting portion 83; and a member having elasticity, which is sandwiched between the pair of contact portions 82, 82. A cross section of the inner hole of the tube of the connecting portion 83 is the same as the cross section of the inner hole of the pipes 5A and 5B to be connected, and the inner surface of the tube is flat. A method for producing and storing a polymerizable liquid, comprising: 9. The gasket 8 has a disk shape, the central hole 81 of the gasket 8 is a circular hole, and the circular hole is provided so as to coincide with the center of the outer peripheral circle of the gasket 8. The diameter of the outer circumferential circle of the gasket 8 is (the above flange 6B
Of the plurality of bolt insertion holes 62B provided in the flange 6B by drawing a circle centered on the center axis of the circle, the diameter of the circle drawn by the center of the hole) + (the diameter of the bolt insertion hole 62B) − (the bolt insertion hole). 9. The method for producing and storing a polymerizable liquid according to claim 8, wherein the diameter of the bolt 7A to be inserted into 62B is 2) × 2. 10. Pipes 5A and 5 for flowing a polymerizable liquid.
B, a pair of flanges 6A and 6B, a bolt 7A and a nut 7B for fixing the pair of flanges 6A and 6B to face each other, and the pair of flanges 6A and 6B.
And a plate-shaped gasket 8 having a hole 81 in the center, which is used between the flanges 6A and 6B. The bolt 7A is inserted into the bolt insertion holes 62A and 62B, and the bolt 7A is inserted together with the nut 7B into the pair of flanges 6A and 62B.
A, 6B are fixed, and the gasket 8 is a pair of substantially plate-shaped contact portions 82, 82.
A pair of contact portions 82, 82, which face each other and are connected at the center to form the hole 81; a substantially cylindrical connecting portion 83; and a member having elasticity, which is sandwiched between the pair of contact portions 82, 82. And a cushion section 84 arranged in a horizontal direction.
A pipe fastening structure having the same cross-sectional shape as the internal holes of A and 5B, and the inner surface of the cylinder is flat. 11. The cross-sectional shape of the internal holes of the pipes 5A and 5B is circular, the gasket 8 is disk-shaped, the central hole 81 of the gasket 8 is a circular hole, and the circular hole is The gasket 8
The center of the outer circumference circle is set to coincide with the center,
A plurality of the bolt insertion holes 62A and 62B are provided in the pair of flanges 6A and 6B so as to draw a circle centered on the central axis of each of the flanges 6A and 6B. 11. The diameter of the circle drawn by the center of the plurality of bolt insertion holes 62B + (the diameter of the bolt insertion hole 62B)-(the diameter of the bolt 7A inserted into the bolt insertion hole 62B) .times.2. The piping fastening structure according to the above.