Porous fiber, adsorbent material, and purification column

Patent metadata

Field	Value
Publication number	US-2019126239-A1
Application number	US-201716096530-A
Country	US
Kind code	A1
Filing date	Apr 20, 2017
Priority date	Apr 27, 2016
Publication date	May 2, 2019
Grant date	—

Abstract

A solid fiber has a modified cross-section which satisfies the following (a) to (b): (a) a modification degree Do/Di, in a cross section of the solid fiber, is 1.20 to 8.50 when the inscribed circle diameter is denoted by Di and the circumscribed circle diameter is denoted by Do; and (b) a porous specific surface area of the fiber is not less than 30 m 2 /g. An adsorbent material comprises not less than 28 vol % of the porous fiber as a fiber bundle. A purification column is formed by arranging the adsorbent material in the straight form in an axis direction of a plastic casing and by attaching an inlet port and an outlet port of a fluid that is to be treated to both ends of the plastic casing. The porous fiber can efficiently adsorb a removal target substance in the fluid that is to be treated, and a purification column incorporates the porous fiber.

First claim

1 . A porous fiber comprising a modified solid cross-section, wherein the porous fiber satisfies the following (a) to (b):
(a) a modification degree Do/Di, in a cross section of the solid fiber, is 1.20 to 8.50 when the inscribed circle diameter is denoted by Di and the circumscribed circle diameter is denoted by Do; and (b) a porous specific surface area of the fiber is not less than 3 m 2 /g.

2 . The porous fiber according to claim 1 , wherein an average radius of pore is not less than 0.8 nm and not more than 90 nm.

3 . The porous fiber according to claim 1 , wherein the porous specific surface area is not less than 30 m 2 /g.

4 . The porous fiber according to claim 1 , wherein an inscribed circle occupancy of the following equation is not less than 0.10:
Inscribed circle occupancy=Area of the inscribed circle of the cross section of the fiber/Area of the cross section of the fiber.

5 . The porous fiber according to claim 1 , wherein a diameter of pore in the porous fiber is not more than 25 μm and a ratio of an average diameter of pore in the area adjacent to the outer surface of the fiber vs an average diameter of pore in the central portion area of the fiber is not less than 0.50 and not more than 3.00.

6 . The porous fiber according to claim 1 , wherein the porous fiber has a structure of the fiber cross-section comprising a porous portion which has a network structure composed of a communication hole and a dense layer which has a more dense structure in comparison to the porous portion, and wherein the porous fiber satisfies the following (d) to (e):
(d) the porous portion and the dense layer are continued with each other; and (e) the dense layer is located closer to the area adjacent to the outer surface of the fiber than the porous portion and a distance T 1 from the outermost surface of the fiber to the porous portion is not less than 0.001 μm and not more than 30 μm.

7 . The porous fibers according to claim 1 , when a circle equivalent diameter (μm) is denoted by T 2 , T 1 and T 2 satisfy the following equation:
T 1/ T 2≤0.030.

8 . The porous fibers according to claim 1 , wherein the solid fiber is in a straight form.

9 . The porous fibers according to claim 1 , wherein the circle equivalent diameter T 2 is not less than 10 μm and not more than 1,000 μm.

10 . The porous fibers according to claim 1 , wherein an open pore ratio at the surface of the porous fiber is not less than 0.5% and not more than 30%.

11 . The porous fibers according to claim 1 , wherein a pore radius distribution index is not less than 1.0 and not more than 2.8.

12 . The porous fibers according to claim 6 , wherein both the porous portion and the dense layer contain not less than 45 vol % of a material common to both as a component material.

13 . The porous fibers according to claim 1 , wherein the porous fiber has a negative charge.

14 . The porous fibers according to claim 1 , wherein the porous fiber comprises an amorphous polymer material.

15 . The porous fibers according to claim 1 , wherein the porous fiber comprises an amorphous polymer material and the amorphous polymer material comprises a polymer with an ester group.

16 . The porous fibers according to claim 1 , wherein the number of adhered platelets which are brought into contact with the surface of the porous fiber is not more than 30/(4.3×10 3 μm 2 ).

17 . An adsorbent material, comprising not less than 28 vol % of the porous fiber according to claim 1 as a fiber bundle.

18 . The adsorbent material according to claim 17 , wherein the adsorbent material is for use in a medical application.

19 . The adsorbent material according to claim 18 , wherein the adsorption amount of β 2 -microglobulin per fiber volume is not less than 0.005 mg/cm 3 .

20 . A purification column which is formed by arranging the adsorbent material according to claim 16 in a straight form in an axis direction of a plastic casing and by attaching an inlet port and an outlet port of a fluid that is to be treated to both ends of the plastic casing.

Assignees

• Toray Industries

Inventors

• Fujieda Hiroaki
• Ueno Yoshiyuki
• Tanaka Kazumi

Classifications

• B01D15/00

  Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor · CPC title

• B01J20/26

  Synthetic macromolecular compounds · CPC title

• B01J20/28

  characterised by their form or physical properties · CPC title

• B01J20/28028

  Particles immobilised within fibres or filaments · CPC title

• B01J20/3007

  Moulding, shaping or extruding · CPC title