Hollow fiber membrane module

A hollow-fiber membrane module comprising:

• a cylindrical case having a first end and a second end in a height direction,
• a plurality of hollow-fiber membranes housed in the cylindrical case, and
• a first potting part which bonds end parts of the plurality of hollow-fiber membranes located on the first end side of the cylindrical case while letting the end parts be open,
• wherein the hollow-fiber membrane has a breaking strength of 23 MPa or more,
• wherein a filling ratio of the hollow-fiber membrane is from 40 to 80%,
• wherein the hollow-fiber membrane is a hollow-fiber membrane containing a fluororesin-based polymer,
• wherein the hollow-fiber membrane has a columnar texture oriented in a longitudinal direction thereof,
• wherein a molecular chain in the columnar texture is oriented in the longitudinal direction of the hollow-fiber membrane, and
• wherein a Raman orientation parameter ν of the molecular chain is from 1.5 to 4.0:
• Raman orientation parameter=(I1270/I840)parallel/(I1270/I840)perpendicular (1)
• wherein:
• parallel condition:
• the longitudinal direction of the hollow-fiber membrane is parallel to a polarization direction;
• perpendicular condition:
• the longitudinal direction of the hollow-fiber membrane is orthogonal to the polarization direction;
• I1270 parallel:
• the intensity of Raman band at 1,270 cm−1 under the parallel condition;
• I1270 perpendicular:
• the intensity of Raman band at 1,270 cm−1 under the perpendicular condition;
• I840 parallel:
• the intensity of Raman band at 840 cm−1 under the parallel condition;
• and
• I840 perpendicular:
• the intensity of Raman band at 840 cm−1 under the perpendicular condition.