US 11,701,620 B2
External circulation-type hollow fiber membrane module
Yoshie Tanizaki, Tokyo (JP); and Hiroyuki Okazaki, Tokyo (JP)
Assigned to MITSUBISHI CHEMICAL CLEANSUI CORPORATION, Shinagawa-ku (JP)
Filed by MITSUBISHI CHEMICAL CLEANSUI CORPORATION, Shinagawa-ku (JP)
Filed on Dec. 12, 2019, as Appl. No. 16/711,992.
Application 16/711,992 is a continuation of application No. PCT/JP2018/022698, filed on Jun. 14, 2018.
Claims priority of application No. 2017-116620 (JP), filed on Jun. 14, 2017; application No. 2017-117077 (JP), filed on Jun. 14, 2017; and application No. 2017-173041 (JP), filed on Sep. 8, 2017.
Prior Publication US 2020/0114315 A1, Apr. 16, 2020
Int. Cl. B01D 63/02 (2006.01); B01D 63/04 (2006.01)
CPC B01D 63/021 (2013.01) [B01D 63/043 (2013.01); B01D 63/024 (2013.01); B01D 2313/08 (2013.01); B01D 2321/185 (2013.01); B01D 2325/24 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An external circulation-type hollow fiber membrane module for removing gas from a to-be-treated liquid or supplying gas to the to-be-treated liquid, the hollow fiber membrane module comprising:
a hollow fiber membrane bundle formed of a plurality of aligned hollow fiber membranes;
a case in which the hollow fiber membrane bundle is accommodated; and
a short-path prevention body that blocks a flow of a to-be-treated liquid in a gap between the hollow fiber membrane bundle and the case, and
a cylindrical first port that communicates with the inside of a case body is provided at a portion of the case body of the case near a first open end such that the cylindrical first port protrudes outward from an outer peripheral surface of the case body,
wherein a first end of the hollow fiber membrane bundle in a length direction is fixed in the case by a potting portion while an open state of an open end of each of the hollow fiber membranes is maintained,
wherein the case body of the case has a length of from 5 cm to 50 cm,
wherein a distance from a position of a central axis of the cylindrical first port to a second end of the hollow fiber membrane bundle is set to d11, in millimeters, and a distance from a position of the central axis of the cylindrical first port to the short-path prevention body is set to d12, in millimeters, and when the cylindrical first port is a liquid flow-in port, d12/d11 is from 0.01 to 0.2,
wherein the short-path prevention body is in contact with the hollow fiber membrane bundle,
the short-path prevention body is provided on a downstream side of the liquid flow-in port that allows the to-be-treated liquid to flow in around the plurality of aligned hollow fiber membranes in the case and protrudes from an inner surface of the case,
wherein the liquid flow-in port is provided near the first open end of the case body, and a liquid flow-out port is provided near a second opening end opposite side from the first open end, and
wherein a bending resistance of the hollow fiber membrane is from 15 mN to 25 mN, and wherein the bending resistance is measured by a method according to JISL1096 using a sample including seven hollow fiber membrane bundles having a width of from 25 mm to 26 mm and a length of 51 mm, in which the hollow fiber membranes are folded back in units of 32 hollow fiber membranes (32 fil).