JPS5944081B2 - Complex selective separation membrane module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite selective separation membrane module comprising a hollow fibrous membrane and a flat membrane.

When a mixture of two or more substances, especially a gas mixture, is separated and disposed of using a membrane, the separability and permeability of the membrane are usually at odds with each other. In a molecular membrane, it is extremely difficult to satisfy both separation performance and permeability.

For example, a polydimethylsiloxane film has high transparency for oxygen, but low separability from nitrogen.

Furthermore, polyurethane membranes, polycarbonate membranes, polyvinyltrimethylsilane membranes, and the like have high nitrogen and oxygen separation properties but low permeability.

In order to solve these problems, copolymer membranes and blend membranes of highly selective polymers and highly permeable polymers have been proposed, but a sufficient solution has not yet been reached.

By the way, it is known to provide another ultra-thin selective membrane on the surface of a highly permeable porous membrane, and the idea of solving the above problem by combining different types of membranes is well known. It is.

The present invention makes it possible to provide a selective separation membrane module that is excellent in both selective separation performance and permeability by combining a hollow fibrous membrane and a flat membrane.

That is, in the composite selective separation membrane module according to the present invention, a large number of hollow fibers are assembled into a flat shape, resin is molded into blocks on both sides of the assembly, and each hollow fiber membrane terminal is formed into a resin block. An element having an opening at the end face is interposed between the folds of a continuously folded envelope-shaped flat membrane,
The folded portion of the flat membrane hermetically shields the element from the outside, and the element portion on the opposite side to the shielded side is open to the outside, and is one block in the element group. One block has an inlet for the substance to be treated to feed the substance to the hollow fibrous membrane of the element group, and the other block has an inlet for the substance to be treated that passes through the hollow hole of the hollow fibrous membrane of the element group. The configuration is characterized in that the envelope-shaped flat membrane is provided with an outlet for taking out the permeated substance into the envelope.

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

FIG. 1 shows an element A used in the present invention.

In Fig. 1, 1, 1, . .

In this element A, each hollow fibrous membrane 1, 1...
The terminals of ... are open to the end faces of the resin blocks 2, 2.

FIG. 2A shows a vertical cross-sectional view of a module as an embodiment of the present invention, and FIG. 2B shows a b-b cross-sectional view in FIG. 2A.

In FIGS. 2A and 2B, 3 is a continuous envelope-shaped flat membrane, and inside the envelope is a spacer 30 for ensuring the movement of permeated gas. For example, a plastic net or a plastic with an uneven surface. Contains films, etc.

This envelope-shaped flat membrane 3 is folded back in a zigzag shape.

A, A...... are the above elements, and the second
In Figure A, the hollow fibrous membranes 1, 1...
...A cross section of °°゛ appears.

These elements A, A, . . . are interposed between the folds of the folded envelope-shaped flat membrane 3.

A...... means the stay bolts 5, 5, which are sandwiched between the holding plates 4, 40, and between the holding plates 4, 4.
It is made into a unit by the tightness of...

The folded portions 31, 31 of the flat membrane 3 wrap the upper or lower end sides of the elements A, A, and so on. 31 is completely shielded from the outside by the resin 6, as shown in FIG.

71 is an upper cover airtightly attached above the unit u;
Reference numeral 72 denotes a lower cover that is airtightly mounted below the unit u, and each is provided with a protruding lower part 10°720.

Reference numerals 81 and 82 are side covers airtightly attached to both sides of the unit (U), and the side covers 8 and 1 have element groups A, A..., gas in hollow fibrous membranes. The gas population 810 for feeding the side cover 8
2 are each provided with a gas outlet 820.

8.8...... is the folded part 31, 31, 31 of the envelope-shaped flat membrane 3 in order to take out the permeated gas inside the flat membrane 3.
Although not shown in the figure, these gas extraction pipes are drawn out from the side wall of the upper cover 71 or the lower cover 72.

In the module according to the present invention, the gas to be treated is
As shown by G in FIG. 2B, the gas is introduced from the gas port 810 of the side cover 81.

This gas G1 is supplied to each element A, A...
・Hollow fibrous membrane 1, 1...... Passes through the hollow pores, and depending on the selectivity and permeability of the fibrous membrane 1, certain gas components do not permeate through the fibrous membrane. G3 in FIG. 2B, the gas in which other gas components are concentrated by the permeation separation of this particular gas component, that is, the concentrated gas G2, is taken out from the outlet 820 of the side cover 82.

As shown by G3 in FIG. 2A, the permeated gas G3 is transmitted to the open portions P, P..., which are not covered by the bent portions of the flat membranes of the respective elements A, A...... . . . reaches the inside of the upper cover 71 or the inside of the lower cover 72, and each cover 71°7
It is taken out from the 20-output lower 10,720.

In this case, due to the high gas permeability of the flat membrane 3, a certain specific gas in a considerable amount of the permeated gas G3 permeates into the envelope-shaped flat membrane 3 due to the selectivity of the flat membrane 3, and thus , the permeate gas G3 is in a concentrated state (0) in the upper and lower covers.
3' is discharged in a concentrated state).

On the other hand, the permeated gas G4 in the envelope-shaped flat membrane 3 is passed through the gas extraction pipe 8.
taken from.

As mentioned above, the composite selective separation membrane module according to the present invention has a composite structure of a hollow fibrous membrane and a flat membrane that have different selectivities and permeabilities, so the selectivity and permeability of each membrane can be adjusted. Accordingly, a gas separation membrane module having desired selectivity and permeability can be obtained.

Furthermore, the envelope-shaped flat membrane is folded back and a hollow fibrous membrane is interposed between the folds, and by shortening the fold interval, it is possible to First, differences in selectivity and permeability can be kept to a small extent in any part.

In addition, the envelope-like flat membrane is a continuous body, which can be folded back,
Since the configuration is such that the elements are interposed between them to form a unit, combinations are easy.

Furthermore, as is clear from the gas transfer process described above, the transfer distance of the supplied gas and the permeated gas can be shortened, and the gas pressure loss is also small, which is efficient.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the element used in the present invention, FIG. 2 A is a vertical cross-sectional explanatory diagram showing a composite selective separation membrane module according to the present invention, and FIG. 2 B is taken along line bb in FIG. 2 A. FIG. 3 is an explanatory cross-sectional view taken along the line ■--■ in FIG. 2B. In the figure, 1, 1...... are hollow fibrous membranes, 2゜2 is a resin block, A is an element, 3 is an envelope-shaped flat membrane,
3i, 31...... are folded parts, 8, 8
. . . is a gas extraction pipe, 810 is a gas inlet, and 820 is a gas extraction port.

Claims (1)

[Claims] 1. A large number of hollow fibrous membranes are assembled into a flat shape, resin is molded into a block shape on both sides of the assembly, and each hollow fibrous membrane terminal has an element opened at the end face of the resin block. It is interposed between the folds of a folded envelope-shaped flat membrane, and the folded part of the flat membrane hermetically shields the element from the outside, and this shielded side and The element portion on the opposite side is open to the outside, and one block in the above element group has an inlet for the substance to be treated for feeding the substance to be treated into the hollow fibrous membrane of the element group, and the other block has an inlet for the substance to be treated for feeding the substance to be treated into the hollow fibrous membrane of the element group. is characterized in that the hollow fibrous membrane is provided with an outlet for taking out the substance to be treated that has passed through the hollow holes, and the envelope-shaped flat membrane is provided with an outlet for taking out the substance that has permeated into the envelope. Composite selective separation membrane module.