Patent ID: 7624971

Claim:
A device comprising: a hollow fiber module including a tubular case and a hollow fiber membrane extending axially through the case, the case including an inflow opening and a discharging opening in a circumferential surface of the case; a housing covering a length of the fiber module and having a larger diameter than the case such that a gap is formed between the case and the housing; an introducing pipe connected to a circumferential surface of the housing and a discharging pipe connected to the circumferential surface of the housing; and a dividing wall that divides the gap into an introducing room in fluid communication with the introducing pipe and the inflow opening and a discharging room in fluid communication with the discharging pipe and the discharging opening; wherein at least one of a position of the introducing pipe for the inflow opening is offset in an axial direction of the hollow fiber module from the inflow opening and a position of the discharging pipe for the discharging opening is offset in the axial direction of the hollow fiber module from the discharging opening.