WO-2026094775-A1 - METHOD FOR MANUFACTURING HOLLOW FIBER MEMBRANE ELEMENT, HOLLOW FIBER MEMBRANE ELEMENT, AND HOLLOW FIBER MEMBRANE MODULE

WO2026094775A1WO 2026094775 A1WO2026094775 A1WO 2026094775A1WO-2026094775-A1

Abstract

This method for manufacturing a hollow fiber membrane element comprises: a membrane bundle formation step for forming a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled in a cylindrical shape; a first fixing step for fixing a first membrane bundle end, which is one end of the hollow fiber membrane bundle, with a resin; and a second fixing step for fixing a second membrane bundle end, which is the other end of the hollow fiber membrane bundle, with a resin. In the first fixing step, the resin for fixing the first membrane bundle end is cured under cooling. This hollow fiber membrane element comprises: a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled in a cylindrical shape; a first fixing part that is made of a resin and fixes a first membrane bundle end, which is one end of the hollow fiber membrane bundle; and a second fixing part that is made of a resin and fixes a second membrane bundle end, which is the other end of the hollow fiber membrane bundle. The coefficient of variation of the outer diameters of the plurality of hollow fiber membranes is 3.5 or less.

Inventors

ONODERA YUYA
YAMAMOTO WATARU
KIMURA TOSHIKI

Assignees

DIC株式会社

Dates

Publication Date: 20260507
Application Date: 20251023
Priority Date: 20241031

Claims (16)

A membrane bundle formation step in which multiple hollow fiber membranes are bundled together in a cylindrical shape to form a hollow fiber membrane bundle, A first fixing step involves fixing one end of the hollow fiber membrane bundle, which is the first membrane bundle end, with resin. The process includes a second fixing step of fixing the second membrane bundle end, which is the other end of the hollow fiber membrane bundle, with resin, In the first fixing step, the resin used to fix the end of the first film bundle is cooled while the resin is cured. A method for manufacturing hollow fiber membrane elements.
In the first fixing step, the end of the first membrane bundle is inserted into a cylindrical container, resin is injected into the cylindrical container, and the resin is cured while the cylindrical container is cooled. A method for producing a hollow fiber membrane element according to claim 1.
In the first fixing step, the end of the first membrane bundle is inserted into the first cylindrical container, and the first cylindrical container and the hollow fiber membrane bundle are rotated with the central part of the hollow fiber membrane bundle in the longitudinal direction as the axis, while the resin is supplied between the end of the first membrane bundle and the central part of the hollow fiber membrane bundle, and the resin is cured while the first cylindrical container is cooled. A method for producing a hollow fiber membrane element according to claim 1.
In the first fixing step, the cylindrical container is cooled by air cooling, which involves blowing air onto the cylindrical container. A method for manufacturing a hollow fiber membrane element according to claim 2 or 3.
In the first fixing step, the cylindrical container is cooled by water cooling, which involves supplying a cooling liquid to the cylindrical container. A method for manufacturing a hollow fiber membrane element according to claim 2 or 3.
In the aforementioned membrane bundle formation step, the hollow fiber membrane bundle is formed by applying the resin to the surface of a hollow fiber membrane sheet, in which the plurality of hollow fiber membranes are connected in a curtain-like manner by a plurality of connecting threads, while winding the hollow fiber membrane sheet into a cylindrical shape. A method for producing a hollow fiber membrane element according to claim 1.
In the first fixing step, the end of the first membrane bundle is cooled by air cooling by blowing air onto the end of the first membrane bundle. A method for producing a hollow fiber membrane element according to claim 6.
The material of the aforementioned plurality of hollow fiber membranes is a polyolefin resin. The resin used to fix the end of the first membrane bundle is one of epoxy resin, urethane resin, and olefin resin. A method for producing a hollow fiber membrane element according to claim 1.
The resin used to fix the end of the first membrane bundle is a thermosetting resin. In the first fixing step, a curing agent that promotes the hardening of the resin is injected into the cylindrical container along with the resin. A method for manufacturing a hollow fiber membrane element according to claim 2 or 3.
In the first fixing step, the resin used to fix the ends of the first membrane bundle is cured while being cooled so that the coefficient of variation of the outer diameter of the plurality of hollow fiber membranes is 3.5 or less. A method for producing a hollow fiber membrane element according to claim 1.
In the second fixing step, the resin used to fix the end of the second film bundle is cooled while the resin is cured. A method for producing a hollow fiber membrane element according to claim 1.
In the second fixing step, the end of the second membrane bundle is inserted into the cylindrical container, the resin is poured into the cylindrical container, and the resin is cured while the cylindrical container is cooled. A method for producing a hollow fiber membrane element according to claim 2.
In the second fixing step, the end of the second membrane bundle is inserted into the second cylindrical container, and the second cylindrical container and the hollow fiber membrane bundle are rotated with the central part of the hollow fiber membrane bundle in the longitudinal direction as the axis, while the resin is supplied between the end of the second membrane bundle and the central part of the hollow fiber membrane bundle, and the resin is cured while the second cylindrical container is cooled. A method for manufacturing a hollow fiber membrane element according to claim 3.
The first fixing step and the second fixing step are further comprising a cutting step of cutting the ends of the first membrane bundle end and the ends of the second membrane bundle end. A method for producing a hollow fiber membrane element according to claim 1.
A hollow fiber membrane bundle in which multiple hollow fiber membranes are bundled together in a cylindrical shape, A resin-made first fixing part for fixing the first membrane bundle end, which is one end of the hollow fiber membrane bundle, The system includes a second fixing part made of resin for fixing the second membrane bundle end, which is the other end of the hollow fiber membrane bundle, The coefficient of variation of the outer diameter of the plurality of hollow fiber membranes is 3.5 or less. Hollow fiber membrane element.
A hollow fiber membrane element according to claim 15, The system comprises a housing for accommodating the hollow fiber membrane element, The space within the housing is divided by the plurality of hollow fiber membranes into an internal space including the hollow portion of each of the plurality of hollow fiber membranes and an external space not including the hollow portion of each of the plurality of hollow fiber membranes, The housing has a gas port communicating with the internal space, and a liquid supply port and a liquid discharge port communicating with the external space. Hollow fiber membrane module.

Description

Method for manufacturing a hollow fiber membrane element, hollow fiber membrane element, and hollow fiber membrane module This disclosure relates to a method for manufacturing a hollow fiber membrane element, a hollow fiber membrane element, and a hollow fiber membrane module. Conventionally, hollow fiber membrane modules are known that comprise a hollow fiber membrane element, in which multiple hollow fiber membranes are bundled together in a cylindrical shape, with both ends of the bundle fixed, and a housing that accommodates this hollow fiber membrane element (see, for example, Patent Document 1). This is a schematic cross-sectional view of the hollow fiber membrane element according to this embodiment.Figure 1 shows a schematic cross-sectional view along the line II-II.This is a schematic cross-sectional view showing a portion of the hollow fiber membrane element shown in Figure 1.This is a schematic cross-sectional view showing a portion of the hollow fiber membrane element shown in Figure 1.This is a perspective view illustrating an example of the structure of a hollow fiber membrane bundle.This is a schematic cross-sectional view of the hollow fiber membrane module according to this embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the first embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the second embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the second embodiment.This is a schematic cross-sectional view illustrating a method for manufacturing a hollow fiber membrane element according to the third embodiment.This is a schematic cross-sectional view of a modified hollow fiber membrane element.Figure 18 is a schematic cross-sectional view of a modified hollow fiber membrane module equipped with the hollow fiber membrane element shown. The manufacturing method of the hollow fiber membrane element, the hollow fiber membrane element, and the hollow fiber membrane module of the embodiment will be described below with reference to the drawings. In all figures, the same or corresponding parts are denoted by the same reference numerals, and redundant descriptions are omitted. [Hollow fiber membrane element] Figure 1 is a schematic cross-sectional view of the hollow fiber membrane element according to this embodiment. Figure 2 is a schematic cross-sectional view taken along line II-II shown in Figure 1. Figure 3 is a schematic cross-sectional view showing a part of the hollow fiber membrane element shown in Figure 1. Figure 4 is a schematic cross-sectional view showing a part of the hollow fiber membrane element shown in Figure 1. As shown in Figures 1 to 4, the hollow fiber membrane element 2 according to this embodiment is for degassing a liquid or adding gas to a liquid, and is used, for example, by being incorporated into a hollow fiber membrane module described later. The liquid is not particularly limited, but can be, for example, water such as seawater, drinking water, pure water, or ultrapure water, aqueous solutions in which ammonium sulfate or surfactants are dissolved, organic solvents such as alcohol or hydrocarbons, or ionic liquids. The gas to be added to the liquid is not particularly limited, but can be, for example, carbon dioxide ( CO₂ ), nitrogen ( N₂ ), or the like. The hollow fiber membrane element 2 comprises a liquid flow pipe 21, a hollow fiber membrane bundle 23, a first fixing part 24, and a second fixing part 25. The liquid flow pipe 21 is a cylindrical member that extends in the extension direction D to support the hollow fiber membrane bundle 23. Of the two directions of extension direction D, one direction is called the first extension direction D1, and the other direction is called the second extension dir