JPS6010764B2 - fluid separation device - Google Patents

Description

[Detailed Description of the Invention] Liquid separation technologies such as precision furnace filtration, ultrafurnace filtration, and reverse osmosis are
It has begun to be put into practical use as unit operations for separation, purification, and concentration, as well as pretreatment and main processes for water production and industrial wastewater treatment.

There are four types of membrane separation equipment: tubular type, spiral type, hollow fiber type, and plate type.The size of the effective membrane surface area per unit shell volume, the size of the device type, the degree of contamination of the membrane, and the difficulty of operational management. It is well known from literature that each type has its own advantages and disadvantages. In particular, currently, the most commonly used type in practice from the viewpoint of suitability and equipment cost is the spiral type, which has an effective membrane surface area of 650 per unit shell volume.
It is about 700 to 700.

Moreover, this spiral type has a fluid separation function (hereinafter referred to as "
1.5 to 2.
It is necessary to roll up the so-called "leaf", which is made by sealing two flat membranes on three sides like an envelope, into a spiral shape, and the management of rolling it up is complicated. In particular, when manufacturing elements with a diameter of 15 to 30 m, it is necessary to use multi-leaf, such as 4-leaf or 6-leaf, to find a method to reduce the flow resistance of the water collection channel within the leaf. is the actual situation.

Therefore, as these elements become larger, the winding management becomes more complicated and the cost becomes relatively high.
The inventor of the present invention sought to improve these shortcomings and, after studying various elements, invented an element that is easy to manufacture, highly reliable, and most economical in terms of cost.

The apparatus of the present invention will be explained below based on the illustrated embodiments.

The device of the present invention is a type of so-called pleated fluid separation device, and as shown in FIG. It has a net-like smoother 2 between the eyebrows of 1 to reduce concentration polarization development, and has a fan-shaped water collection pipe with many holes between the upper and lower two stages for building up water permeated with pus, and a separation membrane. 1 has its end overlapped with adhesive at point 3,
The folded end is sealed on its entire surface or on necessary surfaces with a synthetic resin adhesive such as epoxy resin, urethane resin, or silicone resin, as shown in the end seal part 6 in FIG. 5 or the end seal part 6 in FIG. The outer periphery of the folded part is rolled up with a plastic film 5 to protect the separation membrane and increase the linear velocity of the liquid, thereby forming an element.

This element is inserted into a pressure-resistant cylindrical tube 8 as shown in FIG. 5 or FIG. The flow path is restricted to increase the linear velocity of liquid supply within the element.

As a result, an example of the liquid supply channel 10 shown in FIGS. 5 and 7 is generated in the element within the cylindrical pipe 8, but there is no particular difference in element performance.

In addition, as a modification of the element composed of one separation membrane, two separation membranes are folded separately, and the two membrane bodies thus folded are placed in a frame as shown in FIG. Elements assembled integrally with 12 are also conceivable.

In addition, the frame described in this application is made of two split molds, which are placed facing each other and connected with bolts and nuts to play a role corresponding to the fan flat part of the fan flat water collection pipe 4 in Fig. 1. It is something that has been maintained. In this case, the folded separation membrane 1 is assembled into a frame 12 equipped with a perforated plate 13 for passing pus permeated water, a water collection pipe 14, and a '0' ring groove with a reticulated spacer 2 interposed therein. By sealing between the inner side of No. 12 and the membrane body with an adhesive, the supply liquid section and the membrane permeation section can be completely separated. The frame-equipped membrane body constructed in this manner is assembled vertically, a '0' ring is inserted into the frame, and the frames are connected with bolts and nuts, and an element is formed by the assembly method in the same manner as an element composed of a single separation membrane. be done. In the same way, it is possible to increase the number of purulent bodies to form large elements, but this method has the disadvantage of complicating manufacturing management and increasing costs.

The most important features of the device according to the present invention can be summarized in the following four points. That is, firstly, since the folded length is relatively short, such as 20 to 10 lengths, the passage resistance during collection of membrane permeated water is much lower than that of the spiral type, and it has an efficient fluid separation function. In particular, it eliminates the need for resin-treated tricot cloth, which is used in the case of a spiral type, and has a significant cost reduction effect by saving materials and simplifying assembly. Secondly, folding the separation membrane, inserting the silk-like substrate, attaching the water collecting pipe, applying adhesive, etc. are relatively simple and easy operations, so assembly line operations are possible and productivity is high.

Third, the effective membrane area per unit shell volume (membrane packing density) is improved by about 30% compared to the spiral type.This improvement becomes more noticeable as the element becomes larger.Fourth, the furnace The membrane surface can be cleaned using a water jet or the like.

This will be explained below using examples.

SamngClot cellulose diacetate using a known film forming method.
hNo. 601 (trade name of Mills Travis Co.), NaCl 150%, pressure 40k9/sec, temperature 25o0, flow rate 1/sec. A membrane with a hair dressing having the performance shown in (lower) was obtained.

Using this separation membrane, spiral-shaped elements were prepared as products of the present invention and control products having the following specifications, and their performances were measured. Table 1 shows the results.

Table 1 * NacZ1500p pm, pressure 40K mui, h temperature 25℃, liquid supply amount 20 min. recovery rate 10-15 min. From these results, the product of the present invention has a high membrane packing density and a low flow path resistance for membrane permeated water. It is recognized that it is an element with good membrane performance and a fluid separation device.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an embodiment of the present invention, Figures 2, 3, and 4
The figure is an enlarged cross-sectional view showing the arrangement of the separation membrane and silk substrate that make up the element, Figure 5 is a longitudinal cross-sectional view showing how the element is used within a pressure-resistant shell, and Figure 6 is the
7 and 8 are longitudinal and cross-sectional views showing an example of a modified element, FIG. 9 is a cross-sectional view showing an example of a modified element of the present invention, and FIG. 9 is a perspective view of FIG. 9, in which 1 is a separation membrane (LA: membrane, LB: hair cloth, LC: reinforcing cloth), 2 is a mesh baser, 3 is a membrane seal part, 4 is a fan-shaped water collection pipe, 5 is a plastic film, 6 is an end seal, 8 is a pressure-resistant cylindrical tube, 10 is a feed liquid channel, 11 is membrane permeation water, 12 is a frame, and 13 is a porous plate. Ba'zu Takayuki figure 3 ■ Gunmu figure 5 box pierced box 7 figure figure A figure? Figure￥′oFigure

Claims (1)

[Scope of Claims] 1. In a fluid separation device such as precision filtration, ultrafiltration, or reverse osmosis, a flat water collection pipe is regularly folded into two upper and lower stages around the flat water collection pipe, and the ends thereof are An element consisting of a single separation membrane adhered with an adhesive or a separation membrane with a cloth lining, a mesh spacer inserted into the liquid supply side of the folded membrane, and a plastic sheet or film surrounding the outer periphery. A liquid separation device comprising: a pressure-resistant cylindrical tube into which the element is inserted and inscribed; and a sealing material that closes a space formed by the pressure-resistant cylindrical tube and the element. 2. The fluid separation device according to item 1 above, which comprises two membrane bodies folded up and down separately, and a frame for assembling the two membrane bodies integrally.