JPS63151305A - Osmotic evaporation membrane module - Google Patents

Abstract

PURPOSE:To prevent the lowering in the temp. of a liquid to be treated due to latent heat of evaporation and to miniaturize an apparatus, by covering the upper part of the compartment formed by surrounding the periphery of a plate by a wall body with an osmotic evaporation membrane and allowing the liquid to be treated to pass through said compartment. CONSTITUTION:Wall bodies 8 are arranged so as to surround the peripheries of plates 7 to form compartments 9 and osmotic evaporation membranes 11 are arranged so as to cover said compartments 9 and the peripheries of the membranes 11 are mounted to the wall bodies 8 through seal members 10. Perforated plates 14 and metal nets 15 are arranged on the secondary sides of the membranes 11, that is, on the vacuum sides thereof and a planar heat generator 16 is arranged between the upper stage plate 7 and the lower stage plate 7. In this osmotic evaporation membrane module 2, the temp. of the liquid 2 to be treated flowing out from an outflow port 13 is detected by a detector 19 and the current to the planar heat generator 16 is adjusted to change the temp. thereof and the liquid to be treated is held to predetermined temp.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a pervaporation membrane module, and more specifically, a pervaporation membrane module used when a specific component is separated from a solvent using a pervaporation membrane, such as in alcohol concentration. It relates to membrane modules.

[Prior art]

Generally, a separation device using a pervaporation membrane includes a plurality of pervaporation membrane modules 2 in a vacuum container 1, as shown in FIG.
The liquid to be treated is heated to a predetermined temperature by an oil bath 3 into this pervaporation membrane module 2 and sent through line 4, where specific components are separated and the concentrated solution is sent as a product from line 5. It is about to be taken out. Note that 6 is a steam line for heating the oil bath 3.

As shown in FIG. 5, this pervaporation membrane module 2 has a plate 7 surrounded by a wall 8 to form a compartment 9, and a sealing material 10 is applied to the wall 8 to cover the compartment 9. The pervaporation membrane 11 is attached through the wall body 8.
There is a liquid inlet 12 to be treated connected to line 4 and line 5.
A liquid outlet 13 to be treated that is connected to the outlet 13 is provided respectively.

Since the strength of the pervaporative membrane 11 is not very high, a spacer 15 such as a perforated plate and a wire mesh is laminated on the pervaporative membrane 11 to reinforce it.

By the way, in the above configuration, the liquid to be treated is in the oil bath 3.
At this point, it is heated to a predetermined temperature and guided into the pervaporation membrane module 2, but while passing through the compartment 9, the latent heat of vaporization is carried away and the temperature drops. That is, as shown in FIG. 6, what is at the predetermined temperature a at the inlet 12 drops to temperature b at the outlet 13, and as a result, the amount of the specific component passing through the pervaporation membrane 11 changes from C to d. Decrease.

Therefore, in order to treat a predetermined liquid to be treated, a large membrane area is required, resulting in a large fruiting device, resulting in a large installation area and high manufacturing costs.

C. Purpose of the Invention The present invention has been made in order to solve the conventional problems as described above, and its purpose is to reduce the temperature of the liquid to be treated due to the latent heat of vaporization within the pervaporation membrane module. The aim is to prevent this, thereby reducing the membrane area and downsizing the device.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention forms a compartment by surrounding the periphery of the plate with a wall, and provides a pervaporation membrane that covers the upper part of the compartment and is attached to the wall.
It is an object of the present invention to provide a pervaporation membrane module configured to allow a liquid to be treated to pass through the compartment and to heat the plate in a planar manner.

In conventional devices, the liquid to be treated is heated with a heating device before it is supplied to the plate, but in the present invention, the liquid to be treated is heated in a planar manner even within the membrane separator module. It is distinctive in that it did so.

Heating the liquid to be treated within the membrane separator module is advantageous in the sense that the target substance can be accurately separated without reducing the separation effect. As a means for heating the liquid to be treated, a planar heating element is used so as not to obstruct the flow of the liquid to be treated.

Examples of the planar heating element include "Heatflon" manufactured by Twotone Co., Ltd., "Samicon Heater" manufactured by Sakaguchi Dentsu Co., Ltd., "Graft Carbon" manufactured by Nippon Pionics Co., Ltd., and other heating elements that generate heat in a planar manner. can be used.

In any case, it is necessary to heat the liquid to be processed to a predetermined temperature by a means that uniformly heats the liquid to be processed to a predetermined temperature while the liquid is being moved, without obstructing the flow of the liquid to be processed.

The sheet heating element may be installed outside the wide surface of the plate, integrated with the wide surface of the plate, or placed slightly away from the inner surface of the plate so that the liquid to be treated can easily pass through so that both sides of the heating element are in contact with the liquid to be treated. There are some things that have been made to do so.

〔Example〕

Embodiments of the pervaporation membrane module according to the present invention will be described below with reference to FIGS. 1 to 3.

In these figures, the same reference numerals as in FIGS. 4 and 5 indicate the same names.

FIG. 1 is an enlarged sectional view of the pervaporation membrane module 2,
A wall 8 is arranged around the plate 7 so as to surround it, thereby forming a partition 9. A pervaporative membrane 11 is disposed to cover this compartment 9, and the periphery of the pervaporative membrane 11 is attached to the wall 8 via a sealing member 10.

A porous plate 14 and a wire mesh 15 are arranged on the secondary side of the pervaporation membrane 11, that is, on the vacuum side. And the upper plate 7
A planar heating element 16 is arranged between the plate 7 and the lower plate 7.

Although the planar heating element 16 may be constructed as one piece, it is preferable to construct it as a divided type so that the heating value increases gradually toward the downstream side of the liquid to be treated, that is, toward the outlet 13 side.

FIG. 2 shows another embodiment in which the plate 7 itself is constructed as a sheet heating element. That is, the plate 7 is formed by covering a planar heating element 17 such as grafted carbon with a covering material 18 made of heat-resistant polyester plastic or the like.

Even in such a case, it is preferable to use the planar heating element 17 as a split type to change the amount of heat generated, as in the first embodiment.

In such a pervaporation membrane module 2, as shown in FIG. 3, the temperature of the liquid to be treated flowing out from the outlet 13 is detected by the detector 19, the current to the planar heating element 17 is adjusted, and the temperature is adjusted. The liquid to be treated is maintained at a predetermined temperature by changing the temperature.

Of course, the present invention is not limited to the above embodiments (it is clear that various changes can be made without departing from the spirit thereof).

〔Effect of the invention〕

As is clear from the above explanation, according to the pervaporation membrane module of the present invention, the temperature of the liquid to be treated passing through the pervaporation membrane module does not decrease due to latent heat of vaporization, and therefore the amount of permeation of specific components can be reduced. Since the reduction can be suppressed, the membrane area can be reduced, and as a result, it is possible to downsize the device, which has the effect of reducing the installation area and manufacturing cost.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a pervaporation membrane module according to the present invention, in which FIG. 1 is an enlarged sectional view of the main part, FIG. 2 is an enlarged sectional view of the main part of another embodiment, FIG. 3 is a temperature control system diagram, and FIG. 4 is an explanatory diagram of a separation device using a pervaporation membrane. FIG. 5 is an enlarged cross-sectional view of a main part of a conventional pervaporation membrane module, and FIG. 6 is an explanatory diagram of its operation. 1... Vacuum container, 2... Pervaporation membrane module, 3
... Oil bath, 4, 5... Line, 6... Steam line, 7... Plate, 8... Wall, 9...
- Compartment, 10... Gasket, 11... Pervaporation membrane, 12... Inlet, 13... Outlet, 14... Perforated plate, 15... Wire mesh, 16.17... sheet heating element,
18... Covering material, 19... Detector.

Claims (1)

[Claims] A partition is formed by surrounding the periphery of the plate with a wall, a pervaporation membrane is provided that covers the top of the partition and is attached to the wall, and the liquid to be treated is configured to pass through the partition, and A pervaporation membrane module characterized in that the plate is surface heated.