JPS62244405A - Spiral membrane element for membrane separation device - Google Patents

Abstract

PURPOSE:To allow raw liquid flowing in the space between the outer and inner circumferences of element permeate a filter band by encircling the outer circumference of element at the end of winding of spacer band for raw liquid passage and clamping a plurality of points outside with a band. CONSTITUTION:A permeable spacer band 4 is put around the outside of a membrane enveloping band 1 formed by polymerizing a filter band on both sides of the permeable spacer band for filtrate passage and laminatedly wound spirally by several turns around a filtrate collecting tube 5 in such a way that the outer circumference of element is wound at least by one turn at the end of the spacer band 4. More than two separate points to the outer axial direction laminatedly wound are clamped from around with a band 6 made of a material from which component is not eluted if contacted raw liquid such as liquid food containing highly concentrated alcohol. On the outer circumference of the element, exists no FRP component eluting if contacted with alcohol, and flowing between the outer circumference of the element and the inner circumference of a pressure vessel can be contacted with a filter band of a membrane enveloping band 1 through the spacer band 4 to get filtrate.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) This invention provides a cylindrical pressure-resistant container (vessel) with one
The present invention relates to a spiral membrane element for a membrane separation device, in which one or more of these membrane elements are housed and filtration is carried out by permeating a raw liquid into a spirally wound furnace membrane, which is supplied in the axial direction into a container.

(Prior art) Such an element is known from Japanese Utility Model Application Publication No. 5g-1qsboi, and includes a membrane envelope band formed by polymerizing P membrane bands on both sides of a spacer band for Oki liquid flow, and The spacer band for the flow path is layered in a spiral manner around the filtrate collection pipe, and the stock solution flowing in the axial direction through the spacer band for the flow path is brought into contact with the two filter membrane bands of the membrane envelope band. The P liquid is allowed to permeate through the membrane envelope band, and is then guided into the P liquid collection pipe and taken out.

(Problems to be Solved by the Invention) The above element has an impermeable layer made of FnP on the outer periphery of the membrane envelope band and the spacer band for the raw solution flow path, and is operated while being housed in a pressure-resistant container. In order to prevent the undiluted solution from flowing into the space created between the inner periphery of the pressure-resistant container and the outer periphery of the impermeable layer and causing spoilage, the undiluted solution is controlled to flow into the space and stagnate. It prevents

For this reason, for example, it is not suitable to treat a beverage stock solution containing highly concentrated alcohol, since the components of the FRP are bathed out by the alcohol and mixed into the furnace liquid.

Historically, the undiluted solution flowing through the space between the inner periphery of the pressure container and the outer periphery of the impermeable layer mixes with the concentrated dairy liquid that did not pass through the P membrane zone and is discharged from the pressure container. That amount is wasted and the processing efficiency is low.

(Means to Solve the Problem) Therefore, the present invention provides a spacer band for a flow path that surrounds at least one outer circumference of the element on the end side of the winding, and has two or more strips spaced apart from each other in the axial direction on the outside of the S-. It is characterized by being tightened from around with a band.

(Function) There is no material such as FRP on the outer periphery of the element, from which components can be bathed out by alcohol, etc., and the filtrate flows through the space between the outer periphery of the element and the inner periphery of the pressure-resistant container. It can contact and permeate the E membrane zone of the intervening membrane@membrane zone.

(Example) In each of the illustrated examples, / is a membrane envelope band formed by polymerizing filter membrane bands 3.3' on both sides of the water-permeable filtrate flow path spacer, and G is an upper self-membrane envelope. Layered on the outside of the emperor/, membrane envelope belt l
Also shown is a water-permeable stock solution flow path spacer band that is spirally wound multiple times around the P solution water collection pipe 5.

As is well known, the left side of the water collection pipe in the furnace ri is filled with filtrate inside the pipe wall.
1-1 Door membrane belt 3 with slits or holes in the axial direction for
．． 3' has both side edges glued to both sides of the spacer band for the filtrate flow path, and the winding start end of the membrane envelope band/P membrane band 3. The gap between 3' and the spacer band is the top 6. It is fixed to the outer periphery of the water collection pipe S with adhesive or the like so that it communicates with the slit or hole of the water collection pipe S. Incidentally, the 014 portion on the winding end side of each furnace membrane band 3.3' is adhered to the filtrate flow path spacer f in the same manner as the both side edges.

The element shown in Fig. 1 is a monofilament type in which a membrane envelope band/and a spacer band for the concentrate flow path are spirally wound around the water collection pipe 3, and the element shown in Fig. Multiple sets of spacer bands for the flow path, here /α, /b, and gb
It is a biplane type with three sets of , IC, and 4tc wound in a spiral shape.
In addition, the end side of each set of spacers, α, 4, and 4te, is trilobal in shape, so the circumference of the outer circumference should be approximately A longer than the end of the roll of the membrane envelope band, and its extension part should be 41a-11b'
, 'Ic' surrounds the outer periphery of the spacer for the stock solution flow path in two layers. Of course, even in the embodiment shown in Fig. 1, the outer circumference can be reduced with two layers of spacers by making the end of the spacer band longer than the end of the membrane envelope band by the circumference of the outer periphery. .

In this way, the membrane envelope band and the spacer band for the stock solution flow path are wound around two or more positions spaced apart in the axial direction of the outside of the wound layer, and the band is tightened while rotating. In this case, the end side of the spacer band y for the stock solution flow path located on the outer periphery of the wound layer is provided with a band 6 to prevent the filter membrane bands 3 and 3' of the sealing band from being damaged.

The material of the band B may be metal or plastic as long as it has excellent chemical and heat resistance and does not elute components even when it comes into contact with various liquid foods. As for such materials, a typical example of a metal is a stainless steel ribbon, and a typical example of a plastic is a tape made of a heat-shrinkable fluororesin compound of ethylene tetrafluoride and propylene hexafluoride.

Of course, it may be impermeable but not water-impermeable with net-like holes, or it may be wound in a spiral shape with the spacer band on the outer periphery exposed. . Alternatively, the band may be an adhesive tape.

This band 6.6 is made of FRP layered on the outer periphery of the conventional winding layer.
Similarly, this is to prevent deformation due to the expansion of the element during undiluted solution processing, and as a result of various studies, the 4th
As shown in Figure 1, the total C of 1τ5 in the axial direction of Band Otsu and Otsu
L'+t2+ts) is the axial length L of the element
It has been confirmed that even if it is less than μ for emergency use, and less than i for attached bands such as stainless steel, it is durable and can prevent the element from spreading more than necessary.

The element A constructed in this way is housed in a cylindrical pressure-resistant vessel (g) by closing the front ridge of the reactor liquid water collection pipe 3 with a cap 7, and the rear 91 parts of the water collection pipe 3 are placed in a watertight manner at the rear end of the container. Protrude through the shell and connect to the piping. Incidentally, the axial length of the pressure-resistant container may be long (and a plurality of double-sided vessels connected in series with the water collection pipes S by a joint IV) A... may be accommodated (FIG. 5). The concentrated water discharge hole is provided at the rear end of the container, and the stock solution supply hole 10 is provided at the front end of the container.

In this case, the gap between the maximum outer diameter of the element tightened from around it with the band 6 and the inner diameter of the pressure-resistant container should be kept within 2 mm. A stainless steel plate with a thickness of 0.3~/J depending on the size of the element is rolled up to form a cylinder, and the cylinder is charged into the inner diameter of the pressure container to match the maximum outer diameter of the element. Make sure the gap is within 2 inches.

In this way, the stock solution is supplied from the stock solution supply hole IO into the pressure container by pressurizing it with a pump, and the P solution that has permeated through the filter membrane band 3.3' of the membrane envelope band is passed through the spacer band for the filtrate flow path to the left side of the water collection pipe. The P liquid is taken out to the piping connected to the rear end of the water collection pipe, and the r
f The collapsing liquid can be drained to the pipe IrJ connected to the rear end of the pressure vessel and treated.

The stock solution flowing in the gap between the outer periphery of the element and the inner circumference of the pressure container can also come into contact with the membrane band of the membrane seal f/jη via the spacer band lI for the stock solution flow path, and the p that has passed through the membrane band The liquid is similarly collected in the collection tube.

The monoplane element shown in Fig. 1 (outer diameter 5s-sb, groove, average outer diameter #7m, element axial length L 930zu, as a band, the front end, middle, and rear end of the volume I- are made of vinyl with a width l-■ Wrap the tape twice each, and the maximum outer diameter (left 6.61) is the inner diameter! '7. ! ;tm, /=21.67 yen, and was housed in a pressure-resistant container of 3 types of force 1, and the following test was conducted.

io- Average circulation flow bone: CHp90-ta10 t/H pressure; evening □
Kg/an? Supply liquid concentration: Na, C1/θ, ooθmi7 concentration:
B℃ qb for band element length: tri x 3
/ L(930) x 100″t3.9 test results are shown in Figure 6.7.
Test results when the difference between vessel inner diameter, - element band outer diameter A, B is o, q, ■ is vessel inner diameter A
The test result is when the difference between 2aOnv D and -D2 is 1.4'+1, and the test result is when the difference between Bensel inner diameter 67-1D+ -D2 is IO, lItrm.

The smaller the difference between the maximum outer diameter of the band of the element and the inner diameter of the pressure vessel, the better the stainless steel
It has become clear that the membrane performance in terms of f'P liquid permeation t) and furnace liquid # can be improved.

(Effects of the Invention) According to the present invention, since the filtrate is passed through the gap between the outer periphery of the element and the inner periphery of the pressure container, and the filtrate is also permeated through the P membrane zone to form a filtrate, the processing efficiency is significantly improved.

Furthermore, by selecting a material for the band that does not allow components to be eluted by alcohol or the like, it is possible to safely process the undiluted liquid food solution containing a high concentration of alcohol.

In addition, since it is possible to wrap extra layers such as the conventional FRP layered thin membrane envelope band and the spacer band for the stock solution flow path, the membrane area can be significantly increased and an element with improved membrane processing efficiency can be provided.

BRIEF DESCRIPTION OF DRAWINGS Figure 1 is a sectional view of one embodiment of an element according to the present invention;
Figure 2 is a cross-sectional view of another example of the same element, Figure 3 is a cross-sectional view of the membrane seal @firefly used in each of the above elements,
FIG. 4 is a side view of the element, FIG. 5 is an explanatory diagram showing the state of use of the element, and FIGS. 6 and 7 are graphs showing tests of membrane performance of the element.

In the figure, / indicates 1 control tube zone, 1.2 indicates the spacer band for the P mixed flow path, 3.3' indicates the P membrane zone, DA indicates the spacer zone for the stock solution flow path, the left side indicates the water collection pipe, and A indicates the band. .

'G Permission Applicant Kurita Water Industries Co., Ltd.) Agent Patent Attorney Fuku 1) Nobuyuki 7
1・-2! ＞Padong Agent Patent Attorney Fuku 1) Taketsu ゛°
゛1go2'

Claims (7)

[Claims] (1) A membrane envelope band formed by polymerizing filtration membrane bands on both sides of the spacer band for the filtrate flow path and a spacer band for the stock solution flow path are overlapped and wound in a spiral shape around the filtrate collection pipe, The stock solution flowing in the axial direction in the spacer band for the stock solution flow path is brought into contact with the two filter membrane bands of the membrane envelope band to allow the filtrate to permeate into the membrane envelope band,
In the spiral membrane element for the membrane separator that leads into the filtrate collection pipe, two or more membrane elements that surround at least one outer circumference of the element on the winding end side of the spacer band for the raw solution flow path and are spaced apart in the axial direction A spiral membrane element for a membrane separation device, characterized in that the position is tightened with a band from the circumference. (2) In the spiral membrane element according to claim (1), the total width of the bands in the axial direction is 1/100 or more and less than 1/2 of the axial length of the element. element. (3) In the spiral membrane element according to claim (1) or (2), the material of the band is heat-shrinkable plastic.
Or spiral membrane element for membrane separation device which is metal or adhesive tape. (4) A spiral membrane element for a membrane separation device according to claim (1) or (2), wherein the band is spirally wound. (5) In any one of claims (1) to (4), the spiral membrane element has a difference of 2 between the maximum outer diameter of the element and the average inner diameter of the pressure vessel housing the element.
A spiral membrane element for membrane separation equipment that is within mm. (6) In the spiral membrane element according to any one of claims (1) to (4), a cylindrical filler is charged between the outer periphery of the element and the inner periphery of the pressure-resistant container housing the element. A spiral membrane element for membrane separation equipment in which the difference between the maximum outer diameter of the element and the average inner diameter of the pressure vessel is within 2 mm. (7) A spiral membrane element according to any one of claims (1) to (6), in which a membrane envelope band and a spacer band for a raw solution flow path are wound in multiple layers on a filtrate collection pipe. Spiral membrane element for separation equipment.