Patent ID: 8557571

Claim:
A reactor comprising: a rotatably mounted reactor unit having a first chamber and a second chamber, with the first chamber being formed by an interior of a housing and the second chamber being formed by an interior of a plurality of hollow fibers arranged in the housing, and with an axis of rotation of the reactor unit being parallel to an axial direction of the hollow fibers, the reactor unit including (i) at least two opposed casting compounds in which opposite terminal regions of the hollow fibers are embedded and between which another portion of the hollow fibers extends, with a length of the portion of the hollow fibers extending between the casting compounds being at least 1% greater than a distance between surfaces of the opposed casting compounds so as to provide a bulged or spindle-shaped bundle of the hollow fibers between the casting compounds, and (ii) an element that constricts the bulged or spindle-shaped bundle of hollow fibers such that a density of the hollow fibers based on a cross-sectional area of the first chamber is increased in a vicinity of the constriction relative to the density of the hollow fibers without using the element, the element that constricts being located along the bulged or spindle-shaped bundle of hollow fibers between the opposed casting compounds.