JP2005306399A - Sheet lining tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat lining tank (1) comprising a cylindrical can body (2) and a lining sheet (3) lined on an inner peripheral surface (2a) of the can body with an end (31) fixed to an end face (21) of the can body wherein a space (A) is formed between the lining sheet (3) and the inner peripheral surface (2a), a spacer ring (4) having a vent hole (41) communicating with the outside from the space (A) is mounted between the end face (21) of the can body and the end (31) of the lining sheet, and the spacer ring (4) is hardly degraded even when high-temperature hydrogen chloride aqueous solution (B) is stored inside for a long time. <P>SOLUTION: In the sheet lining tank (1), the spacer ring (4) is formed of fluororesin filled with carbon material. Even when high-temperature hydrogen chloride aqueous solution is stored in the sheet lining tank (1), the solution can be stored without degrading the spacer ring (4) by hydrogen chloride gas of raw material or steam as byproduct. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a sheet lining tank, and more particularly to a sheet lining tank provided with a lining sheet that is lined in a can body with a space between the inner peripheral surface of the can body.

As shown in FIG. 1, a sheet lining tank (1) comprising a cylindrical can body (2) and a lining sheet (3) lined on the inner peripheral surface (2a) of the can body (2) , Corrosion of the inner peripheral surface (2a) of the can body due to the contents (B) contained therein, and contamination of the contents (B) due to direct contact with the inner peripheral surface (2a) of the can body can be prevented. Useful in terms. In such a sheet lining tank (1), the end (31) of the lining sheet (3) is strongly pressed by, for example, a lid (5) attached to the end surface (21) of the can body, and the end surface of the can body It is fixed to (21).

Further, as shown in FIG. 1, a gap (A) is provided between the lining sheet (3) and the inner peripheral surface (2a) of the can body, and the end surface (21) of the can body and the end of the lining sheet ( 31), a spacer ring (4) is mounted, and a seat lining tank (1) provided with a vent hole (41) communicating with the spacer ring (4) from the gap (A) to the outside is also provided. Are known. A pipe (not shown) to a suction device such as a suction pump (not shown) is usually connected to the vent hole (41), so that the content (B) slightly penetrates the lining sheet (3). Even if it oozes out, it does not collect between the lining sheet (3) and the inner peripheral surface (2a), and is discharged to the outside from the gap (A) through the vent hole (41) by the suction device. The The spacer ring (4) is usually made of a fluororesin filled with a filler in terms of sealing properties and prevention of deformation called creep [Patent Document 1: Japanese Patent Application Laid-Open No. 2003-2003]. No. 63591], silica particles, glass fibers, and the like are used as the filler.

JP 2003-63591 A

However, in a conventional lining tank, for example, when a high-temperature hydrogen chloride aqueous solution (hydrochloric acid) is stored in the tank for a long period of time, the hydrogen chloride aqueous solution generated from this aqueous solution and permeated through the lining sheet or its evaporated product (hydrogen chloride gas) It has been found that there is a problem of progressive deterioration due to contact with water vapor. Since the spacer ring is strongly pressed against the end face of the can body, there is a risk of crushing when the spacer ring deteriorates.

Therefore, as a result of intensive studies to develop a seat lining tank in which the spacer ring is not easily deteriorated even if the hot hydrogen chloride aqueous solution is accommodated in the interior for a long period of time, the present inventors have filled the carbon material as the spacer ring. It has been found that the use of a fluororesin resin hardly deteriorates even when a high-temperature hydrogen chloride aqueous solution is accommodated, and the present invention has been achieved.

That is, the present invention is a cylindrical can body (2),
A lining sheet (3) having an end (31) fixed to an end surface (21) of the can body (2) and lined to an inner peripheral surface (2a) of the can body (2),
A gap (A) is provided between the lining sheet (3) and the inner peripheral surface (2a) of the can body (2),
Between the end surface (21) of the can body and the end portion (31) of the lining sheet, a spacer ring (4) provided with a vent hole (41) communicating with the outside from the gap (A) is mounted. Seat lining tank (1)
The spacer ring (4) provides a sheet lining tank (1) characterized by being made of a fluororesin filled with a carbon material.

The sheet lining tank of the present invention can be used by storing a hot hydrogen chloride aqueous solution for a long period of time.

As shown in the sectional views of FIGS. 1 to 3, the sheet lining tank (1) of the present invention includes a can body (2) and a lining sheet (3).

The can body (2) has a cylindrical shape, and a cylindrical one is usually used. As the material of the can body (2), a metal material such as carbon steel or stainless steel is used in terms of mechanical strength, as in a normal sheet lining tank. The size of the can body is appropriately selected depending on the internal volume of the tank (1), but is usually about 15 cm to 4 m in outer diameter and about 10 cm to 5 m in length.

For example, as shown in FIG. 1, the can body (2) may have a lid (5) attached to an end surface (21) thereof and constitute a tank (1) together with the lid (5). For example, the lid (5) is firmly pressed and fixed to the end surface (21) by bolting or clamping to a flange (22) provided around the end surface (21) of the can body.

Also, in the tank (1) with a large capacity, as shown in FIG. 2, another can body (2 ') is connected to the can body (2) at the respective end faces (21, 21'). Also good. In order to connect other can bodies (2 '), the flanges (22, 22') provided around the respective end faces (21, 21 ') may be fixed by bolting, clamping, or the like. .

The lining sheet (3) is a sheet in which the end (31) is fixed to the end surface (21) of the can body and is lined to the inner peripheral surface (2a) of the can body (2), and the contents (B) For example, a fluororesin sheet made of a fluororesin such as polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polyethylene, polypropylene, etc. Resin sheets such as olefin resin sheets made of olefin resins and vinyl chloride resin sheets made of polyvinyl chloride are used. The thickness of the lining sheet is selected depending on the size of the lining tank (1), the type of contents, and the like, but is usually about 1 mm to 6 mm.

In the lining tank (1) of the present invention, a gap (A) is provided between the lining sheet (3) and the inner peripheral surface (2a) of the can body. In order to line the gap (A), the lining sheet (3) may be lined without bonding to the inner peripheral surface (2a) of the can body (2) by so-called loose lining. A space (A) may be formed by providing a spacer (not shown) on the inner peripheral surface side (2a) of the lining sheet (3).

A spacer ring (4) is mounted between the end surface (21) of the can body and the lining sheet end portion (31). This spacer ring (4) is used by being mounted between the end surface (21) of the can body (2) and the lining sheet end (31), and its thickness depends on the size of the tank. Although it depends, it is usually about 1 cm to 10 cm.

The spacer ring (4) is provided with a vent hole (41) communicating from the gap (A) provided between the inner peripheral surface (2a) of the can body and the lining sheet (3) to the outside. . The hole diameter of the vent hole (41) is usually about 3 mm to 5 cm, although it depends on the thickness of the spacer ring (4). The number of air holes varies depending on the size of the sheet lining tank, the diameter of the air holes, the thickness of the spacer ring, etc., but is usually about 2 or more and 10 or less. When two or more vent holes are provided, the vent holes (41) are usually provided in the spacer ring (4) radially at substantially equal intervals as shown in FIG. The vent hole (41) may be provided with a screw thread or the like for connecting a pipe to the suction device. The cross-sectional view of the seat lining tank (1) of the present invention shown in FIGS. 1 to 3 is a cross-sectional view at LL ′ in FIG.

In the seat lining tank (1) of the present invention, since the spacer ring (4) is mounted between the lining sheet end (31) and the can body end surface (21), the lining sheet end (31) In this state, it is fixed to the end face (21). When the end of the lining sheet (31) is fixed by the lid (5), between the lid (5) and the end of the lining sheet (31) (Figs. 1 and 3), etc. When the can body (2 ') is connected and used between the end of the lining sheet (31) and the end surface (21') of the other can body (Fig. 2), a ring-shaped gasket ( 7) is installed.

In order to fix the end portion (31) of the lining sheet to the end surface (21) of the can body, for example, as shown in FIG. The spacer ring (4) and the lining sheet end portion (31) are sandwiched between 5) and the end surface (21), and usually the ring-shaped gasket (7) is sandwiched and pressed with the lid (5). In order to press with the lid (5), for example, the lid (5) may be fixed to the flange (22) provided around the end surface (21) by bolting, clamping or the like.

In addition, as shown in FIG. 2, when other can bodies (2 ') are connected to the can body (2) at their respective end faces (21, 21'), the respective end faces (22, 22) are used. The spacer ring (4) and the lining sheet end (31) may be sandwiched between ') and pressed between the end faces (21, 21'). In order to press between the end faces (21, 21 '), for example, flanges (22, 22') provided around each end face (21, 21 ') are bolted, clamped, etc. (2, 2 ') may be connected. When the lining sheet (3 ′) is lined with a gap (A ′) also in the other can body (2 ′), the end portion (31 ′) of the lining sheet (3 ′) is also the end surface (21, 21 ') and is fixed to the end face (21') of the other can body (2 '), and between the end (31') and the end face (21 '), a vent hole (41 A spacer ring (4 ') provided with') may be mounted.

In the sheet lining tank (1) of the present invention, a spacer ring (4) made of a fluororesin filled with a carbon material is used. Examples of the carbon material include graphite particles and carbon fibers. The carbon material may be crystalline or amorphous. Examples of the fluororesin include polytetrafluoroethylene (PTFE) and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA). Fluorocarbon resins filled with such carbon materials are, for example, “Valflon No. 7026”, “6TO”, “6PO”, etc. from Nippon Valqua Industries, Ltd., “Full-on PTFE RB2015”, etc. from Asahi Glass Co., Ltd. Can be used by appropriately cutting it.

As shown in FIG. 3, the seat lining tank (1) of the present invention has an inner peripheral surface (2a) of a gap (A) provided between the inner peripheral surface (2a) of the can body and the lining sheet (3). ) Side, the outer lining sheet (6) may be lined. As the outer lining sheet (6), the same resin sheet as described above in the lining sheet (3) can be used, and the thickness is usually about 1 mm to 6 mm. By lining the outer lining sheet (6), the contact of the contents (B) with the can body inner peripheral surface (2a) can be further reduced. The end portion (61) of the outer lining sheet (6) is mounted between the end surface (21) of the can body (2) and the end portion (31) of the lining sheet (3).

The inner peripheral surface (2a) of the can body may be coated with a resin such as fluororesin, olefin resin, vinyl chloride resin, or the like, as described above.

Since the seat lining tank (1) of the present invention uses a fluororesin filled with a carbon material as the spacer ring (4) provided with the air holes (41), the absolute pressure is 1.5. Even when a hydrogen chloride aqueous solution (B) having a concentration of about 10% to 35% heated to 100 ° C. or higher in a state of being pressurized to atmospheric pressure (0.15 MPa) or more is contained, it is generated from this aqueous solution, and a lining sheet ( Storage tank that can store hydrogen chloride aqueous solution over a long period of time without deteriorating the spacer ring (4) by hydrogen chloride gas and water vapor that permeate 3), and stores and stores hot hydrogen chloride aqueous solution under pressure Can be suitably used.

Further, by a heater (not shown) such as a reboiler that extracts and heats a part of the contents in the seat lining tank (1), which is installed in the seat lining tank (1) of the present invention. Even if the hydrogen chloride aqueous solution (B) having a concentration of about 10% to 35% is heated to a high temperature of 100 ° C. or higher under pressure, the hydrogen chloride generated from the heated hydrogen chloride aqueous solution and permeates the lining sheet (3). The ventilation ring (4) is not deteriorated by gas and water vapor, and the aqueous hydrogen chloride solution (B) can be heated over a long period of time, so that it can be used as a heating tank for containing the aqueous hydrogen chloride solution and heating it under pressure. Can also be suitably used.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this Example.

Example 1
Cutting a filler-filled fluororesin (manufactured by Nippon Valqua Kogyo Co., Ltd., “6TO”) in which 75 parts by mass of polytetrafluoroethylene (PTFE) is dispersed in 25 parts by mass of carbon particles to 40 mm in diameter and 2.00 mm in thickness A test piece (8) was obtained. As shown in FIG. 5, the test piece (8) was made of PFA alone and adhered to a disk-shaped PFA sheet (9) having a diameter of 40 mm and a thickness of 2.4 mm, and was superposed on one end of the pipe (10). From the pipe (10) side, the PFA sheet (9) and the test piece (8) were fixed in this order by a clamp (not shown) and a bolt (not shown). The pipe (10) was filled with a mixed gas (C) of hydrogen chloride gas and water vapor obtained by heating and azeotroping an 18.5% hydrogen chloride aqueous solution (hydrochloric acid). At this time, the temperature of the hydrogen chloride aqueous solution was 142 ° C., and the pressure in the pipe was about 0.2 MPa (2 atm) in terms of gauge pressure. When the test piece (8) after 646 hours (about 27 days) had been visually observed in this state, no discoloration was observed. Moreover, the thickness of the test piece (8) was 2.04 mm.

As the spacer ring (4) of the seat lining tank (1) as shown in FIG. 1, the filler-containing fluororesin [6TO] used above is used, and the tank (1) has a pressure of about 0.2 MPa (gauge pressure). When a hydrogen chloride aqueous solution (B) of about 140 ° C. was filled and stored at the same temperature, the spacer ring (4) was not deteriorated even after 1 year.

Reference example 1
Instead of the test piece obtained in Example 1, a fluororesin containing filler containing 25 parts by mass of glass fiber in 75 parts by mass of polytetrafluoroethylene (manufactured by Nippon Valqua Industries, Ltd., “2TO”) is 40 mm in diameter and thickness. When the same operation as in Example 1 was performed except that the test piece (8) cut to 2.00 mm was used, the test piece (8) after 646 hours had turned pale yellow and its thickness Swelled to 2.31 mm.

It is sectional drawing which shows an example of a seat lining tank typically. It is sectional drawing which shows an example of a seat lining tank typically. It is sectional drawing which shows an example of a seat lining tank typically. It is a schematic diagram which shows an example of a spacer ring. 2 is a schematic diagram for explaining a test method for a test piece in Example 1. FIG.

Explanation of symbols

1: Seat lining tank 2, 2 ': Can body
21, 21 ': End face 22, 22': Flange 2a: Inner peripheral surface of the can body 3, 3 ': Lining sheet
31, 31 ': Lining sheet edge 4, 4': Spacer ring
41, 41 ': Ventilation hole 5: Lid 6: Outer lining sheet
61: Outer lining sheet end 7: Ring-shaped gasket 8: Test piece 9: PFA sheet
10: Pipe A: Gaps B provided between the lining sheet and the can body: Contents (hydrogen chloride aqueous solution)
C: Mixed gas of hydrogen chloride gas and water vapor

Claims (5)

A cylindrical can body, and a lining sheet having an end portion fixed to an end surface of the can body and lined on an inner peripheral surface of the can body, and between the lining sheet and the inner peripheral surface of the can body Is a sheet lining tank provided with a spacer ring provided with a vent hole communicating from the gap to the outside between the end surface of the can body and the end portion of the lining sheet. The spacer ring is a sheet lining tank characterized by being made of a fluororesin filled with a carbon material. An outer lining having an end portion mounted between the end surface of the can body and the spacer ring and lining on the inner peripheral surface side of a gap provided between the lining sheet and the inner peripheral surface of the can body The lining tank of Claim 1 provided with the sheet | seat. The can is used by being mounted between an end surface of a cylindrical can body and an end portion of a lining sheet that is fixed to an end surface of the can body and is lined with an inner peripheral surface of the can body. A spacer ring provided with a vent hole communicating from the gap provided between the inner peripheral surface of the main body and the lining sheet to the outside,
A spacer ring made of a fluororesin filled with a carbon material. A method for storing an aqueous hydrogen chloride solution, comprising storing the aqueous hydrogen chloride solution in the sheet lining tank according to claim 1 or 2 at a temperature of 100 ° C or higher. A method for heating a hydrogen chloride aqueous solution, comprising heating the hydrogen chloride aqueous solution to a temperature of 100 ° C. or higher in the sheet lining tank according to claim 1.

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