JPS58159808A - Membrane sealing cylinder for separating solution - Google Patents

Abstract

PURPOSE:To enable sepn. under atmospheric pressure as well and to simplify the construction of a membrane module by providing passage materials for permeating liquid in a sealed cylindrical body having a porous conductive sheet on one surface and a non-water-permeable sheet on the other surface and applying high frequency electricity thereto. CONSTITUTION:Passage materials 3 for permeating liquid are provided in a coiled and sealed cylindrical body A of which the one surface is formed of a porous conductive sheet 1 having a porous dielectric membrane on one body and the other surface is formed of a non-water-permeable sheet 2. High frequency electricity is applied to the sheet 1 to induce microoscillations. The soln. of raw liquid supplied through an inlet 71 under atmospheric pressure is separated by such microoscillations. The separated liquid is concentrated in a concentrating pipe 5, and the raw liquid after the sepn. of the soln. is discharged to the outside through an outflow port 72. The sepn. efficiency is improved under atmospheric pressure as well by the above-mentioned device and the construction is made simple.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a membrane envelope for separating solutions, and is used, for example, when separating alcohols from a mixed solution of alcohols and water.

An envelope of a reverse osmosis membrane or an ultrapolar membrane is sometimes used for the separation treatment of stock solutions, and a spiral membrane module is known as one of the membrane separation devices using the envelope.

This spiral membrane module has a permeate passage material inside the envelope membrane. The open end of the cylindrical membrane is connected to the water collection pipe, and the envelope membrane is wound around the water collection pipe in a spiral shape, and is usually an external pressure type. Thus, the solvent in the high-pressure stock solution permeates through the membrane, and this permeate is collected in the water collection pipe through the permeate passage material in the spiral envelope membrane.

However, in modules using conventional membrane envelopes, not limited to spiral modules, it is necessary to pressurize the stock solution, and therefore the pressure-resistant structure inevitably complicates the configuration.

By the way, in the case of a mixed solution of two or more mutually compatible liquids, the mixed solution is applied to one side of a porous conductive sheet having a dielectric porous membrane that is hydrophobic to one of the liquids (liquid A). 1 and apply a high frequency voltage to the conductive sheet.
Then, the above-mentioned liquid A can be separated. The reason for this is that the dielectric porous membrane of the conductive sheet acts as a capacitor against high-frequency voltage, and when this capacitor is charged with electric charge and the charging voltage reaches a certain voltage, a discharge occurs (intra-pore discharge). When the voltage drop due to this discharge reaches the discharge stop voltage, the discharge disappears and charging starts again.
However, due to this repeated charging and discharging, microwave vibrations are generated in the conductive sheet, and due to this microwave vibration energy, the molecules of the above-mentioned liquid A resist the bonding energy between the molecules of other liquids. This divided A
This is because the liquid molecules pass through the pores of the conductive sheet (the dielectric porous membrane of the conductive sheet is hydrophobic with respect to liquid A).

In the separation of such solutions, the mixed solution, which is the stock solution, may be kept at normal pressure.

The membrane envelope for solution separation according to the present invention is the above-described meltable one, in which the sheet on the negative side is a porous conductive sheet integrally having a porous dielectric membrane, and the sheet on the other side is a water-impermeable sheet. This configuration is characterized in that a permeated liquid passage material is provided in the envelope body, and a high frequency power source is connected to the porous conductive sheet.

The present invention will be explained below with reference to the drawings.

Figure 1 shows a seal according to the present invention! It shows Tomu.

In FIG. 1, 1 is a porous conductive sheet having a porous dielectric film on one side, for example, a porous Teflon sheet whose surface has been made conductive by radicalization, and 2 is a water-impermeable sheet. Both of these sheets are formed into an envelope by sealing on three sides. 3 is a permeate passage material provided inside the envelope body. 1° is the same porous conductive sheet as 1 above, 4 is the porous support layer (insulating) provided between the porous conductive sheets 1 and 1', and the porous conductive sheet 1° and the porous support layer 4 are It can also be omitted.

FIG. 2A shows a cross-sectional view of a solution separation apparatus using a membrane envelope according to the present invention, and FIG. 2B shows a longitudinal cross-sectional view of the same apparatus.

In FIG. 2A and FIG. 2B, 5 is a permeated liquid collection pipe, the open end of the envelope hL: 6 is communicated with the water collection pipe 5 through a water collection pipe slit 51, and the envelope body A is connected to the water collection pipe 5. It is wrapped around.

Reference numeral 6 denotes a spacer for passage of the concentrate interposed between the wound layers of the envelope body, and an electric coil (using an insulated wire such as an enameled wire) can be used. Reference numeral 7 denotes a container, which is equipped with a stock solution inflow lower 1 and an outflow lower 2, and both ends of the outer surface of the wrapped envelope are sealed to the inner surface of the container via a backing 8.8. 9 high frequency power source, which is connected to the porous conductive sheet of the wrapped envelope body A.

In the above, the undiluted solution is supplied from the undiluted solution inlet lower 1 at approximately normal pressure, and when this undiluted solution passes between the layers of the wrapped envelope body A, micro-vibrations caused by the high-frequency voltage of the porous conductive sheet 1 in the envelope body A are caused. The two solutions described above are separated,
The separation liquid passes through the permeate passage material 3 in the wrapped envelope body A and reaches the water collection pipe 5. On the other hand, the stock solution after solution separation flows out from the lower 2
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In the above, when an electric coil is used as the spacer 6 between the winding and circuit layers, if a high frequency current is also passed through this coil 6,
The electromagnetic vibrations of the coil 6 are transmitted to the porous conductive sheet 1, thereby further promoting the solution separation.

If an electrode is provided on the outer periphery of the cylinder and a DC electric field is applied between the electrode and the water collecting pipe 5 in a direction that accelerates the molecules (ions) of the separated liquid toward the center of the water collecting pipe 5, the separated liquid can promote the diffusion and movement of molecules and improve separation efficiency.

As mentioned above, in the membrane envelope for solution separation according to the present invention, unlike conventional membrane envelopes, the stock solution can be processed at normal pressure, so there is no need to impart pressure resistance to the membrane module, and therefore the structure of the membrane module is can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view showing a membrane envelope for solution separation according to the present invention, and FIGS. 2A and 2B are a cross-sectional explanatory view and a longitudinal cross-sectional view, respectively, showing a solution separation device using the membrane envelope according to the present invention. FIG. In the figure, A is an envelope body, 1 is a porous conductive sheet, 2 is a water-impermeable sheet, 3 is a permeated liquid passage material, 5 is a water collection pipe, and 9 is a high frequency power source.

Claims (1)

[Claims] (1) A permeated liquid passage material is provided inside the envelope body, in which the - side sheet is a porous conductive sheet integrally having a porous dielectric film and the other side sheet is a water-impermeable sheet, and the porous conductive sheet is A membrane envelope for solution separation, which is characterized by being connected to a high frequency power source.