JP3048501B2 - Carbonated spring manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for producing a carbonated spring from which a physiologically effective carbonated spring (= dissolved carbon dioxide gas) can be easily obtained.

[0002]

2. Description of the Related Art Carbonated springs have been used in baths using hot springs for a long time because of their excellent heat-retaining effect.
It is considered that the warming action of the carbonated spring is basically because the body environment is improved by the peripheral vasodilating action of the contained carbon dioxide gas. In addition, the percutaneous invasion of carbon dioxide causes an increase and expansion of the capillary bed and improves blood circulation of the skin. For this reason, it is said to be effective in treating degenerative lesions and peripheral circulatory disorders.

[0003] Since the carbonated spring has such an excellent effect, attempts have been made to artificially mix it. For example, hot water of carbon dioxide has been obtained by a method of sending carbon dioxide gas into the bathtub in the form of air bubbles, a chemical method of acting a carbonate and an acid, a method of pressurizing and sealing hot water and carbon dioxide gas in a tank for a certain period of time, and the like.

Japanese Patent Application Laid-Open No. 2-279158 proposes a method in which carbon dioxide is supplied through a hollow fiber semipermeable membrane and absorbed in water.

[0005]

However, in the conventional method of producing carbonic acid hot water, for example, in a chemical method, a large amount of chemicals must be introduced in order to bring the carbon dioxide gas concentration to 300 ppm, and the inside of the bathtub must be increased. In the method in which carbon dioxide gas is sent in the form of bubbles, the rate of dissolution of carbon dioxide gas in hot water is only about 10%, and most of the carbon dioxide gas is dissipated.

According to the method described in Japanese Patent Application Laid-Open No. 2-279158, the dissolving efficiency is improved but not sufficient as compared with the chemical method or the method of feeding in the form of bubbles. Specifically, according to the method disclosed in the embodiment of the publication, a carbon dioxide gas flow rate of 10 liters / min
100 minutes to make 600 liters of hot water 100 minutes
It is stated that it takes 30 minutes to reach 0 ppm, and the dissolution efficiency in this experiment is only 35% to 60%.

[0007] The dissolution efficiency in this case is a value indicating what percentage of the carbon dioxide used is dissolved. In this embodiment, 200 liters of hot water was supplied at a flow rate of 1000 pp using a membrane area of 4.2 m ² at a carbon dioxide gas flow rate of 10 liters / min.
It takes 30 minutes to reach m. Such a value is not sufficient for the purpose of dissolving a high concentration of carbon dioxide in a shorter time with a smaller film area.

The reason why the embodiment of the publication has such an insufficient value is considered to be that the structure of the disclosed disperser is inappropriate. That is, in the structure as shown in FIG. 2, the flow of water is biased to a specific location, and the dissolution efficiency of carbon dioxide gas is reduced.

Another reason is that the membrane disclosed in the above publication is a semipermeable membrane, that is, a porous membrane, so that it becomes bubbles and carbon dioxide gas passes through the membrane, and the bubbles are completely dissolved in water. Therefore, it is presumed that it escapes as gas. An object of the present invention is to produce a high-concentration carbonated spring by dissolving carbon dioxide gas in hot water efficiently in a simple and compact manner.

[0010]

This and other objects are achieved by the invention described below. (1) In a method for producing a carbon dioxide spring in which hot water and carbon dioxide gas are supplied to a carbon dioxide gas dissolver and the carbon dioxide gas is dissolved in the hot water in the dissolver, the carbon dioxide gas dissolver is made of resin at both ends of the hollow fiber membrane bundle. Fixed, the converging part at the center in the longitudinal direction of the hollow fiber membrane, the hot water inlet communicating with the outer part of the hollow fiber membrane near the resin fixing part, and the carbonated spring at the position symmetrical to the hot water inlet with respect to the center of the dissolver. A method for producing a carbonated spring, wherein a carbon dioxide gas inlet is provided at one end communicating with the outlet and the hollow portion of the hollow fiber membrane.

(2) One of the open ends of the hollow fiber membrane communicates with the inlet for carbon dioxide gas, and the other open end of the hollow fiber membrane communicates with the outside of the melter through an outlet pipe having an on-off valve. The method according to the above (1), further comprising a mechanism for discharging water collected inside the hollow fiber membrane to the outside through the outlet pipe.

(3) The hollow fiber membrane is characterized in that the hollow fiber membrane is a composite hollow fiber membrane having a three-layer structure in which both sides of a thin nonporous layer having excellent gas permeability are sandwiched between porous layers. ).

The present invention will be specifically described below with reference to the drawings. FIG. 1 is an example of a schematic configuration diagram of a dissolver suitable for use in the present invention. 1 is a dissolver, 2 is an inlet for carbon dioxide gas, 3 is an inlet for hot water, 4 is a hollow fiber membrane, 5 is an outlet for carbonated spring, 6 is a drain, 7 is a resin part, and 8 is a hollow fiber membrane converging part. It is.

According to the present invention, the hot water passes through the hollow fiber membrane in which the carbon dioxide gas flows through the hollow portion, whereby the carbon dioxide gas is dissolved in the hot water. According to the present invention, since the converging portion of the hollow fiber membrane is provided at the central portion in the longitudinal direction of the hollow fiber membrane, the drift of the hot water is less likely to occur, and the hot water passes across the hollow fiber membrane, so that the boundary film is formed. It is thin and has good gas exchange efficiency.

Further, the present invention has a mechanism that has a drain vent on the side opposite to the carbon dioxide gas inlet and through which water collected inside the hollow fiber membrane can be released to the outside as needed.

FIG. 2 shows an example of the hollow fiber membrane of the present invention.
Is a homogeneous layer, and B is a porous layer. The hollow fiber membrane is composed of a composite hollow fiber membrane having a three-layer structure in which both sides of a thin nonporous layer having excellent gas permeability are sandwiched between porous layers, and is, for example, manufactured by Mitsubishi Rayon Co., Ltd. A three-layer composite hollow fiber membrane (MHF) is exemplified.

A non-porous gas permeable membrane is a membrane through which a gas is dissolved and diffused by a diffusion mechanism, and any membrane is used as long as molecules are substantially free of gas-permeable pores such as Knudsen flow. It may be something.

By using a non-porous gas permeable membrane,
At an arbitrary pressure, the gas can be supplied and dissolved without releasing the gas as bubbles, so that the gas can be efficiently dissolved and easily dissolved at an arbitrary concentration with good controllability.

Further, water or an aqueous solution does not flow back to the gas supply side through the membrane. Preferred examples of the film material include silicones, polyolefins, polyesters, polyamides, polyimides, polysulfones, celluloses, and polyurethanes.

[0020]

EXAMPLES The present invention will be specifically described with reference to examples.
"Carbon dioxide concentration" was measured with an ion meter IM40S carbon dioxide electrode CE-235 manufactured by Toa Denpa Kogyo KK.

Example 1 A carbonated spring was manufactured using the apparatus shown in FIG. For the dissolver 1, a module for dissolving carbon dioxide having a membrane area of 1.8 m ² was prepared. The hollow fiber membrane has a three-layer structure, an inner diameter of 200 μm, an inner layer and an outer layer each being a polyethylene porous membrane having a thickness of 20 μm, and an intermediate layer being a non-porous membrane segmented polyurethane membrane having a thickness of 0.5 μm.

Hot water at 40 ° C. was supplied to the dissolver 1 at a rate of 15 l / min. At the same time, the pressure of the carbon dioxide gas was adjusted from a carbon dioxide gas cylinder, and the flow rate of the adjusted carbon dioxide gas was supplied at a flow rate of 4 l / min. The concentration of carbon dioxide in the warm water flowing out of the dissolver was measured to be 480 ppm, and the dissolution efficiency at that time was 92%.
Met.

[0023]

According to the method for producing a carbonated spring of the present invention, a highly concentrated carbonated spring can be obtained by dissolving carbon dioxide gas in warm water efficiently by a simple and compact method.

[Brief description of the drawings]

FIG. 1 is a schematic structural diagram of a dissolver suitable for use in the present invention.

FIG. 2 is an example of a hollow fiber membrane suitable for use in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dissolver 2 Carbon dioxide gas inlet 3 Hot water inlet 4 Hollow fiber membrane 5 Carbon dioxide spring outlet 6 Drain drain 7 Resin part 8 Hollow fiber membrane converging part A Homogeneous layer B Porous layer

Continuation of the front page (72) Inventor Atsushi Gotan 4-6-1, Sunadabashi, Higashi-ku, Nagoya-shi, Aichi Examiner, Mitsubishi Rayon Co., Ltd. Product Development Research Institute Examiner Yoshimura Murayama (56) References JP-A-63-264127 (JP) JP-A-2-107317 (JP, A) JP-A-2-279158 (JP, A) JP-A-57-86623 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B01F 1/00

Claims (3)

(57) [Claims] 1. A method for producing a carbonated spring in which hot water and carbon dioxide gas are supplied to a carbon dioxide gas dissolver, and the carbon dioxide gas is dissolved in the hot water in the dissolver. And a hot water inlet connected to the outside of the hollow fiber membrane near the resin fixing part at the center of the hollow fiber membrane in the longitudinal direction, and a carbonated spring at a position symmetrical to the hot water inlet with respect to the center of the dissolver. A method for producing a carbonated spring, wherein a carbon dioxide gas inlet is provided at one end communicating with the outlet and the hollow portion of the hollow fiber membrane. 2. A dissolving device wherein one open end of the hollow fiber membrane communicates with a carbon dioxide gas inlet and the other open end communicates with the outside of the dissolving device through an outlet pipe having an on-off valve. 2. The method according to claim 1, further comprising a mechanism for discharging water collected inside the hollow fiber membrane to the outside through the outlet pipe. 3. The hollow fiber membrane according to claim 1, wherein the hollow fiber membrane is a composite hollow fiber membrane having a three-layer structure in which both sides of a thin nonporous layer having excellent gas permeability are sandwiched between porous layers. Manufacturing method.