JPH0957008A - Deaerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the elution of metal ions into a liquid to be treated and the formation of rust in a device in which a deaeration element is arranged in a vacuum chamber by fitting the ends of the deaeration element in the start ends of joining members made of fluororesin and projecting the terminations of the joining members to outside the vacuum chamber. SOLUTION: In a deaerator 1, joining members 6 are fitted over the ends 3a of a deaeration element 3, and the deaeration member 3 is arranged in a vacuum chamber 2, and the joining members 6 are fixed by using fixing members 7 with the terminations of the joining members 6 being projected to outside the vacuum chamber 2. The deaeration element 3 is a gas permeable tube bundle 5 made of fluororesin or a gas permeable tube bundle 5 which two or more gas permeable tubes made of fluororesin are tied into a bundle to form, and the joining members 6 made of fluororesin are fitted over the ends 3a of the deaeration elements 3. In this way, the deaerator 1 in which metal ions are not eluted during deaeration treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing apparatus which does not elute metal ions during degassing in a degassing operation for removing dissolved gas in a liquid.

[0002]

2. Description of the Related Art With the creation of highly sensitive detectors in various analytical instruments such as liquid chromatography,
High-purity analytical reagents are also required. When air etc. dissolves in such high-purity chemicals, discoloration or deterioration,
Alternatively, an increase in impurities may occur, and a highly accurate analysis result may not be obtained. Generally, such high-purity chemicals are manufactured through various processes in order to increase the purity, but particularly in the process of manufacturing chemicals that need to avoid mixing metal ions, they have excellent heat resistance and solvent resistance. The use of a fluororesin device prevents metal ions from entering.

As a degassing method for degassing a dissolved gas such as air dissolved in a liquid, a degassing device using a separation membrane which selectively permeates the gas in the liquid is used.
As a degassing element used in such a degassing device, for example, a gas permeable tube bundle (15) formed by bundling a plurality of long gas permeable tubes (14) made of synthetic resin as shown in FIG. ) And this gas permeable tube bundle (1
An example is a tubular polytetrafluoroethylene fitting piece (16) fitted and bonded to the end of 5). Such a degassing element (13) is arranged inside a vacuum chamber (12) connected to a vacuum pump (25) as shown in FIG. Since the inside of the vacuum chamber (12) is depressurized, when the liquid to be degassed is passed through the gas permeable tube (14), the dissolved gas in the liquid is removed from the wall of the gas permeable tube (14). Has a structure in which it is removed by degassing in the system, and is being used in various industrial fields other than the treatment of analytical reagents.

In order to mount the conventional degassing element (13) inside the vacuum chamber (12), for example, as shown in FIGS. 6 and 7, a fixing member (17) is attached to the connection port (18) of the vacuum chamber (12). And the deaerating element (13) was attached to this fixing member (17).
The fixing member (17) has a pipe connector portion (20) to which a liquid sending pipe is connected at an outer end portion thereof, and a fitting piece (16) of a deaeration element (13) at an inner wall of the inner end portion. The fitting part (19) for fitting is formed, and the flange part (21) and the screw part (22) for screwing the nut (23) are formed in the substantially central part. The fitting member (19) of the fixing member (17) has a deaerating element (1).
3) Insert the fitting piece (16) into the nut (2
It was fixed in step 3) and placed inside the vacuum chamber (12).

[0005]

However, when a metal is used as the material of the fixing member (17), metal ions are often eluted in the treatment liquid, which is not suitable for treatment of high purity reagents and the like. There was a problem of not being suitable. In order to solve this problem, it was considered that the fixing member (17) was made of fluororesin. But according to this draft method,
Although the elution of metal ions can be prevented, there is a problem that the moldability becomes complicated and the entire apparatus becomes expensive. The problem to be solved by the present invention is to provide a deaerator having a simple structure, which does not elute metal ions or rust in the treatment liquid in a deaerator for deaerating dissolved gas in a solution. To do.

[0006]

According to the present invention, a degassing element formed by bundling one fluororesin gas permeable tube or two or more fluororesin gas permeable tubes is provided inside a vacuum chamber. In the degassing device arranged in, the end of the degassing element is fitted into the starting end of the joining member made of fluororesin, the joining member is connected and fixed to the vacuum chamber by a fixing member, and the end portion of the joining member is A degassing device characterized in that it is exposed to the outside of the vacuum chamber, and a heat-fusible fluororesin powder is planarly interposed between the outer surfaces of both ends of the gas permeable tube and the inner surface of the joining member starting end, Both ends of the permeable tube are aligned and bundled, and both sides of the permeable tube are fitted into the starting ends of the joining members, and both ends of the gas permeable tube and the starting ends of the joining members are heated and pressurized by means of heating and pressing means. A deaeration apparatus according to claim 1, characterized by being a more integrally joined.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The deaerator according to the present invention will be described below.
This will be described with reference to the drawings. 1 is a sectional view showing an embodiment of a degassing apparatus according to the present invention, and FIG. 2 is a partial sectional view showing a joint portion between a degassing element and a vacuum chamber in an embodiment of the degassing apparatus according to the present invention. FIG. 3 is a schematic view showing a deaerating element used in the present invention fitted in a joining member. In the figure, (1) is a deaerator, (2) is a vacuum chamber of the deaerator (1), (3)
Is a degassing element. (4) is a gas permeable tube used for the degassing element (3), (3a) is an end of this degassing element (3), (5) is gas permeation where the gas permeable tube (4) is gathered Sex tube bundle, (6)
Is a joining member fitted to the end of the gas permeable tube bundle (5). (7) is a fixing member for fixing the vacuum chamber (2) to the degassing element (3), and (8) is a connection port through which the end portion (3a) of the degassing element (3) penetrates.
(9) is a ferrule and (10) is a nut.
(11) is a suction port for depressurizing the vacuum chamber (2).

The deaerator (1) has a joining member (6) fitted to the end (3a) of the deaerator (3), and the deaerator (3) is placed inside the vacuum chamber (2). And by fixing the joining member (6) to the vacuum chamber (2) using the fixing member (7) in a state where the end portion of the joining member (6) is exposed to the outside of the vacuum chamber (2). To be done. In this example, the vacuum chamber (2) and the fixing member (7) are made of metal. The end portion (3a) of the degassing element (3) is joined and integrated with the joining member (6) via a fluororesin powder. The fixing member (7) is fixed to the connection port (8) of the vacuum chamber (2) by welding or the like, and the fixing member (7) has an insertion hole communicating with the connection port (8) and an outer peripheral surface. The threaded portion is formed on. The joining member (6) has a connection port (8) and this connection port (8).
Is inserted into a fitting hole communicating with the fixing member (7) and is tightened by a nut (10) through a ferrule (9) or the like.
It is fixed to.

The degassing element (3) used in the present invention is formed by bundling one fluororesin gas permeable tube (4) or two or more fluororesin gas permeable tubes (4). This is a gas permeable tube bundle (5), and a joining member (6) made of fluororesin is fitted to the end portion (3a) of the degassing element (3). Specific examples of the material of the gas permeable tube (4) and the joining member (6) used in the present invention include polytetrafluoroethylene (PTFE) and tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA). , Tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoroethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE) and the like can be exemplified, but the present invention is not limited thereto. Further, in the present invention, the number and length of the fluororesin gas permeable tube (4) are not particularly limited and can be appropriately selected according to the purpose of use. The length of the portion of the joining member (6) that is exposed to the outside of the vacuum chamber (2) is not particularly limited as long as it has a length that can be connected to a liquid delivery pipe. The length of the joining member (6) inside the vacuum chamber (2) is not particularly limited as long as it is equal to or longer than the length of the fixing member (7). Joining member (6)
Is brought out of the vacuum chamber (2) and fixed in the vacuum chamber (2). By doing so, metal ions do not elute in the treatment liquid in the degassing step, rust does not occur, and since the fixing member (7) does not come into contact with the treatment liquid, it can be made of metal and thus is broken. Hateful.

In the present invention, when the gas permeable tubes (4) are bundled to form the gas permeable tube bundle (5),
It is preferable that the end portion is fused and bonded by interposing a fluororesin powder having a heat-fusible property. Here, as the fluororesin having heat fusion property, FEP, PTFE, P
Powders such as FA and ETFE can be preferably used, but not limited to these. When the gas permeable tube bundle (5) is integrated, a pressure resistant core material such as a metal wire or a metal rod may be inserted, or a mold may be externally attached to the end. The deformation of the gas permeable tube (4) can be prevented. Further, even when the gas permeable tube bundle (5) is inserted into the joining member (6), the end portion of the gas permeable tube bundle (5) and the joining member (6) are made of a fluororesin powder having heat fusion property. It is preferable that they are joined and integrated by interposing and fusing. Further, regardless of the number of the gas-permeable tubes (4), it is preferable that the gas-permeable tubes (4) are joined and integrated with the joining member (6) by fusion with fluororesin powder interposed. By fusion-bonding the fluororesin powder having heat-fusion property in this manner, the insertion into the fixing member (7) becomes easy, and the insertion is performed between the gas-permeable tubes (4) or between the gas-permeable tubes (4). It can be performed accurately without causing a deviation between the sex tube bundle (5) and the joining member (6).

The material of the vacuum chamber (2) is not particularly limited as long as it has a predetermined strength, and specifically, metal such as carbon steel, stainless steel, cast iron, copper, brass and aluminum, polyvinyl chloride. , Thermoplastic resins such as polyethylene and acrylic, and thermosetting plastics such as phenol resin, melamine resin and epoxy resin. Further, the shape and size of the vacuum chamber (2) are such that the suction port (1
1) and a connecting port (8) capable of airtightly joining the ends of the fixing member (7) and the joining member (6) and having a size capable of accommodating the deaeration element (3) therein. It is not particularly limited as long as it is.

The material of the fixing member (7) is not particularly limited as long as it has a predetermined strength. Specifically, metal such as carbon steel, stainless steel, cast iron, copper, brass, aluminum, polyvinyl chloride, Examples thereof include thermoplastics such as polyethylene and acrylic, and thermosetting plastics such as phenol resin, melamine resin and epoxy resin. The shape of the fitting hole of the fixing member (7) may be any shape that allows the fitting member (6) to be tightly fixed in the fitting hole, and the upper end surface of the fixing member (7) has a connection port for the vacuum chamber (2). There is no particular limitation as long as it can be airtightly fixed to the lower end surface of (8). As a method of fitting and fixing the joining member (6) in the fitting hole of the fixing member (7), a method of using an adhesive, a convex portion is provided on the joining member (6), and the convex portion is fixed. A method of engaging with the fitting hole of 7), a method of providing a screw portion on the outer periphery of the fixing member (7), fitting the ferrule (9) into the joining member (6), and tightening with the nut (10) can be exemplified. It is not limited to these methods.
Furthermore, the upper end surface of the fixing member (7) and the vacuum chamber (2)
Examples of the method for fixing the lower end surface of the connection port (8) include a method using an adhesive and a method by welding or heat fusion, but are not limited to these methods.

[0013]

EXAMPLES The deaerator according to the present invention will be specifically described below. Inner diameter 0.5 mm, outer diameter 0.8 mm, length 28c
m of the PTFE gas permeable tubes of m are bundled, and a mold is externally attached to both ends of the gas permeable tube bundle, and PFA is provided on the outer peripheral surface of the end of each gas permeable tube.
The powder was applied, heated and pressed at 370 ° C. for 10 minutes, and the gas permeable tubes were fused and integrated with each other to obtain a gas permeable tube bundle having a circular cross section. At the end of this gas permeable tube bundle, a heat-shrinkable cylindrical joining member made of fluororesin and coated with PFA powder was fitted, and the gas permeable tube bundle and the joining member were fused. Integral to obtain a degassing element with an effective length of 20 cm. As shown in FIG. 1, a part of the joining member of the deaeration element is fitted into the fixing member to be taken out of the vacuum chamber, and a part of the joining member remaining inside the vacuum chamber is fastened with a nut through a ferrule. The degassing element was fixed to form a degassing device. When degassing water using this degasser,
The water was well degassed and there was no elution of metal ions.

[0014]

According to the present invention, the degassing element formed by bundling one gas permeable tube made of fluororesin or two or more gas permeable tubes made of fluororesin is arranged inside the vacuum chamber. In the deaerator, the end of the deaerator is fitted into the starting end of a fluororesin joining member, the joining member is connected and fixed to the vacuum chamber by a fixing member, and the end of the joining member is connected to the vacuum chamber. The degassing device, which is characterized in that it is exposed to the outside, and the heat-fusible fluororesin powder is planarly interposed between the outer surfaces of both ends of the gas permeable tube and the inner surface of the joining member starting end, and the gas permeable tube is Both ends are aligned and bundled, and both surfaces are fitted into the starting end of the joining member, and both ends of this gas permeable tube and the starting end of the joining member are integrally joined by heating and pressing means. Since a deaeration apparatus according to claim 1, characterized in that is it provides the following effects. The effect of the invention according to claim 1 is that since the end portion of the joining member made of fluororesin is exposed to the outside of the vacuum chamber,
That is, in the degassing step, metal ions do not elute in the treatment liquid and rust does not occur. Further, since the fixing member of the degassing element does not come into contact with the degassing treatment liquid, it does not need to be made of fluororesin, so that it is difficult to break. The effect of the invention according to claim 2 is that the gas-permeable tube and the joining member are joined and integrated by the heat-fusible fluororesin powder, so that the work of inserting the degassing element into the fixing member becomes easy, and When these are inserted, the gas permeable tube and the joining member will not be displaced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a deaerator according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a joint portion between a degassing element and a vacuum chamber in an embodiment of the degassing device according to the present invention.

FIG. 3 is a schematic view of a state in which the degassing element used in the present invention is fitted in the joining member.

FIG. 4 is a schematic view of a conventional degassing element.

FIG. 5 is a schematic view of a conventional degassing device using a degassing element.

FIG. 6 is a sectional view of a conventional deaerator.

FIG. 7 is a partially enlarged cross-sectional view of a joint portion between a degassing element and a vacuum chamber in a conventional degassing device.

[Explanation of symbols]

 1 ... Deaeration device 2 ... Vacuum chamber 3 ... Deaeration element 3a ... End 4 ... Gas permeable tube 5 ... Gas Permeable tube bundle 6 ... Joining member 7 ... Fixing member 8 ... Connection port

Claims (2)

[Claims] 1. A degassing device in which a degassing element formed by bundling one fluororesin gas-permeable tube or two or more fluororesin gas-permeable tubes is arranged inside a vacuum chamber. The end portion of the degassing element is fitted into the starting end of a joining member made of fluororesin, the joining member is connected and fixed to the vacuum chamber by a fixing member, and the end portion of the joining member is exposed to the outside of the vacuum chamber. A degassing device characterized by being 2. A heat-fusible fluororesin powder is planarly interposed between the outer surfaces of both ends of the gas permeable tube and the inner surface of the joining member starting end, and the gas permeable tubes are bundled with both ends aligned. The degassing apparatus according to claim 1, wherein both sides are fitted into the starting end portion of the joining member, and both end portions of the gas permeable tube and the starting end portion of the joining member are joined and integrated by heating and pressing means. apparatus.