JPS59162906A - Fluid separation apparatus and preparation thereof - Google Patents

Abstract

PURPOSE:To prevent the generation of contamination in an internal pressure type fluid separation apparatus using a tubular or hollow fiber membrane caused by microorganisms propagated in the presence of the permeation liquid or air bubbles stayed in the apparatus, by imparting a specific configuration to each inner surface of the fixing parts due to a resin at both end parts of said apparatus. CONSTITUTION:A plurality of hollow fiber membranes 1 are received in an outer cylinder 3 having a permeation liquid outtake port 2 in a parallelly bundled state and the mutual spaces between the hollow fiber membranes and the outer cylinder 3 are secured at both end parts thereof by a casting resin 4. The inner surface 4' of this casting resin 4 is brought to the surface almost same to the opening surface 2' of the permeation liquid outtake port 2 in the vicinity thereof and formed into a slightly concaved surface shape from said opening surface 2' toward the outer cylinder 3. That is, the distance (l') between the inner surface 4' of the casting resin 4 in the inner wall of the outer cylinder 3 in the opposite side of the opening surface 2' becomes gradually large with respect to the distance (l) between the inner surface 4' and the end surface 4'' of said resin 4. The liquid permeated through the hollow fiber membranes 1 is smoothly flowed along the inner surface 4' in a staying-free state and easily withdrawn from the system through the permeation liquid outtake port 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal pressure type fluid separation device using a tubular membrane or a hollow fibrous membrane, and a method for manufacturing the same.

When separating solvents or solutes from stock solutions by reverse osmosis, ultrafiltration, or precision filtration, or for gas separation, internal pressure fluid separation devices with tubular or hollow fibrous membranes may be used. .

Conventionally, as such a fluid separation device, one in which a tubular membrane or a hollow fibrous membrane and an outer cylinder housing the membrane are fixed at both ends with casting resin is known.

FIG. 1 shows an example of a fluid separation device using conventional hollow fibrous membranes, in which a plurality of hollow fibrous membranes 11 are bundled in parallel, and both ends of the hollow fibrous membranes 11 are connected to an outer wall having a permeate collecting IJ3012. It is integrally fixed to the cylinder 13 with molding resin 14.

When a liquid is separated using the apparatus 1ffi, the liquid is supplied, the concentrated liquid is discharged from the other side, and the obtained permeate is discharged from the permeate outlet 12.

In manufacturing such a fluid separation device, a centrifugal casting method is used in order to satisfactorily fill both ends of the outer cylinder with casting resin and to make the inner surface of the casting resin uniform. However, in the conventional centrifugal casting method, as shown in FIG.
Since it is rotated around the axis Q perpendicular to the casting resin 1
4 hardens along the rotational radius R, and the inner surface 1 of the casting resin 14
4' is formed in a slightly concave shape with respect to the central axis P. Therefore, bubbles and permeate generated at the start of operation accumulate near the inner surface 14', causing problems such as microorganisms propagating in the retention area and contaminating the permeate, resulting in a decrease in the performance of the fluid separation device. Huh.

The invention was made in order to solve the drawbacks of the conventional wave technique.There is no fluid retention part in the device, which prevents the low performance of the device and makes it possible to create an extremely safe fluid. The present invention provides a separation device and a method for manufacturing the same.

That is, in the present invention, a plurality of tubular membranes or hollow fibrous membranes are bundled in parallel and housed in an outer cylinder having a permeate outlet, and the membranes at both ends thereof and between the membranes and the outer cylinder are formed by casting. In a fluid separation device fixed with resin, the inner surface of the molded resin is approximately flush with the opening surface of the permeated liquid outlet in the vicinity of the opening surface, and extends from the opening surface toward the inside of the outer cylinder. The present invention relates to a fluid separation device characterized by a curved shape.

Furthermore, the present invention provides a method for manufacturing the above-mentioned fluid separation device, in which a plurality of tubular membranes or hollow fibrous membranes are bundled in parallel and housed in an outer surface having a permeate outlet. In the manufacturing method of a fluid separation device in which the membrane phase and the membrane and the outer cylinder are fixed with casting resin by centrifugal casting, the center of rotation of the centrifugal casting is set perpendicular to the central axis of the outer cylinder. The present invention relates to a method for manufacturing a fluid separation device characterized by performing centrifugal casting in a state eccentric to the permeate outlet side along the axis.

Hereinafter, a fluid separation device using a hollow fibrous membrane will be described as an example of the present invention based on the drawings. It can also be applied to

In FIG. 3, a plurality of hollow membranes 1 are bundled in parallel and housed in an outer cylinder 3 having a permeate outlet 2, and the hollow fibrous membranes 1 at both ends are The membrane 1 and the outer cylinder 3 are fixed with a casting resin 4. The casting resin 4
The inner surface 4' is approximately flush with the opening surface 2' of the permeated liquid outlet 2 in the vicinity of the opening surface 2', and slightly extends from the opening surface 2' toward the inside of the outer cylinder 3. It is gradually curved in a concave shape. That is, the inner surface 4' of the casting resin 4 is the inner surface of the inner wall of the outer cylinder 3 on the opposite side to the opening surface 2' with respect to the distance l between the inner surface 4' of the casting resin 4 at the opening surface 2' and the end surface 4''. The distance 4' between the end face 4'' and the end face 4'' gradually increases.

When a liquid is separated using the fluid separation device configured in this manner, bubbles and permeate flow smoothly along the inner surface 4' of the molded resin 4 without remaining in the device, and the permeate exit port 2 can be successfully extracted from the system.

The above-mentioned fluid separation device has a plurality of hollow fibrous membranes 1 bundled in parallel and housed in an outer cylinder 3, with hollow #l! Between fibrous membranes 1 and hollow fJ! ! When fixing the fibrous membrane 1 and the outer cylinder 3 with the casting resin 4 by centrifugal casting, the rotation center O of the centrifugal casting is aligned along the axis Q perpendicular to the central axis P of the outer cylinder 3.
This can be obtained by performing centrifugal injection while eccentrically moving toward the permeate outlet 2 side. Here, the eccentricity θ varies depending on the length and inner diameter of the outer cylinder 3, but may be at least 1/2 times the inner diameter of the outer cylinder 3, and is usually set to 1/2 to 2 times. Also, eccentricity t
If e is increased, the difference in distance (#'-l) between the inner surface 4' and end surface 4'' of the casting resin 4 can be increased;
It is preferable to set the eccentricity e to be about 10+u to 20+u.

As described above, according to the present invention, since there is no fluid retention part in the device, air bubbles and permeate do not accumulate, preventing deterioration of device performance and providing a fluid separation device with extremely high safety. has.

Note that although the above explanation has been given for the case where liquid is subjected to membrane separation treatment, the fluid separation device of the present invention can also be applied to waste separation treatment.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional fluid separation device, FIG. 2 is an enlarged longitudinal sectional view of the end of FIG. 1, and FIG. 3 is an enlarged longitudinal sectional view of the end of the fluid separation device showing an example of the present invention. It is a front view. l...Hollow fibrous membrane, 2...Permeated liquid outlet, 3...Outer cylinder, 4...Casting resin patent applicant Nitto Electric Industry Co., Ltd. Company representative Sanbe Hijikata

Claims (2)

[Claims] (1) A plurality of tubular membranes or hollow fibrous membranes are bundled in parallel and housed in an outer cylinder having a permeate outlet, and the spaces between the membranes at both ends and the membrane and the outer cylinder are made of casting resin. In the fluid separation device, the inner surface of the molded resin is approximately flush with the opening surface of the permeate outlet near the opening surface of the permeate outlet, and is gradually curved from the opening surface toward the inside of the outer cylinder. A fluid separation device characterized by: (2) The tubular membrane V is a plurality of hollow fibrous membranes bundled in parallel and housed in an outer cylinder having a permeate outlet, and molded between the membranes at both ends and between the membrane and the outer cylinder. 1. A unique method for manufacturing a fluid separation device using centrifugal casting using lard,
A method for manufacturing a fluid separation device C, characterized in that centrifugal casting is performed with the center of rotation of the centrifugal casting eccentrically pointing toward the permeate outlet side along an axis perpendicular to the central axis of the outer cylinder.