Provided is a membrane distillation module 100 comprising a membrane distillation membrane cartridge 10 and a membrane distillation housing 20, wherein: the membrane cartridge 10 comprises a membrane anchoring part 12 in which porous membranes 11 are anchored by anchoring resin; the housing 20 comprises a housing body 30 and a housing lid 40; the membrane distillation module 100 comprises a support part 60 where the outer surface of the membrane anchoring part 12 is supported by the inner surface of the housing 20 with a seal member 50 interposed therebetween; and a value C in the cross section of the support part 60 is at least 30° C. as represented by the following formula, where d.sub.F is the equivalent circular diameter (mm) of the outer circumference of the membrane anchoring part 12, k.sub.F is the linear expansion coefficient (1/° C.) of the anchoring resin, d.sub.E is the equivalent circular diameter (mm) of the inner circumference of the housing 20; and k.sub.E is the linear expansion coefficient (1/° C.) of a portion where the housing 20 contacts the seal member 50.

A device for substance exchange between a first medium, in particular blood, and a second medium, in particular a gas/gas mixture, includes a housing element in which there is arranged a hollow-fiber bundle containing substance-permeable hollow fibers which extend axially between the axial ends of the housing element and at their respective axial end region are potted with a potting compound, at least among one another, and around which the first medium can flow and through which the second medium can flow. Also, a method for producing the device is provided.

The present invention provides a membrane filtration module comprising a housing in which the filtration membrane is disposed in a fixed positional relationship by a potting or bonding material obtained by the curing of a two component (2K) composition consisting of: a first component (A) comprising at least one compound (a) having at least two acetoacetate functional groups; and, a second component (B) comprising at least one compound (b) having at least one amino group, each said amino group being a primary or secondary amino group.

Provided is a polyurethane resin-forming composition for a membrane-sealing material, the polyurethane resin-forming composition contributing to formation of (1) a urethane resin that is excellent in moldability, has a suppressed elution amount of a low-molecular-weight reaction product, and has excellent appearance or (2) a urethane resin that has a low viscosity, is excellent in cast moldability, and has a reduced water elution amount of a low-molecular-weight reaction product and a reduced solvent elution amount of a molded product.

The polyurethane resin-forming composition for a membrane-sealing material comprises: a polyisocyanate prepolymer (A) or an allophanate group-containing polyisocyanate prepolymer (A′) comprising a reaction product of a diphenylmethane diisocyanate (a1-1) and/or a modified product of a diphenylmethane diisocyanate (a1-2), and an active hydrogen-containing compound (a2); and a castor oil polymerized polyol (b1) comprising a castor oil polymerization product.

An allophanate group-containing polyisocyanate composition that contributes to the formation of a polyurethane resin with fewer bubbles is provided.

Disclosed is an allophanate group-containing polyisocyanate composition (C) including a reaction product of diphenylmethane diisocyanate (A) and a hydroxyl group-containing compound (B), wherein the hydroxyl group-containing compound (B) includes a hydroxyl group-containing polymethylsiloxane compound (B-1) in an amount of 1 ppm or more and 300 ppm or less.

In some embodiments, a filter membrane module includes at least one ceramic filter element made of a sintered, porous, ceramic structure, a potting material for potting the ceramic filter element, the potting material having an uncured state and a cured state, and a housing, wherein the potting material is a thermoplastic or a thermosetting plastic that in the cured state has a tensile strength in the range of about 2-65 MPa and a thermal expansion coefficient in the range of about 55-260×10−6/K, and a penetration depth of the potting material into the structure of the filter element is in the range of 0.24 mm to 3.0 mm, and a shrinkage after curing is less than 1.24%.

The present invention concerns a filtration membrane bundle (30) comprising a plurality of elongated filtration fibers (40) arranged in a spiraled coil (34); and one or more filaments (50) woven around the plurality of elongated filtration fibers (40) binding one or more adjacent elongated filtration fibers (40) at a predetermined and homogeneous spacing (44,48) from one another wherein each elongated filtration fiber (40) is bound to respective adjacent elongated filtration fibers (40) in a co-planar configuration, and wherein the co-planar configuration of filtration fibers (40) are rolled into a coil (34). Furthermore, a filtration membrane assembly comprising the filtration membrane bundle (30) and a housing and method of providing the filtration membrane bundle (30) are disclosed.

Polyurethane encapsulating compounds for the embedding of hollow fibers of filter elements are provided. These are obtainable by mixing a polyol component (A) and an isocyanate component (B) to give a reaction mixture and reacting the mixture to completion to give the polyurethane encapsulating compound, wherein the polyol component (A) comprises (a1) at least one fatty-acid-based polyol, (a2) at least one amine compound having at least one tertiary nitrogen atom and at least one isocyanate-reactive hydrogen atom and (a3) at least one metal compound that functions as a polyurethane catalyst, wherein the polyurethane catalyst (a3) does not comprise any tin, lead and/or mercury and the isocyanate component (B) comprises at least one aromatic isocyanate having at least two isocyanate groups. Further provided is a method for producing filter elements using the polyurethane encapsulating compounds and the use of the polyurethane encapsulating compounds for the embedding of hollow fibers.

The invention relates to a method for potting hollow fiber membranes in potting compounds of increased temperature resistance, wherein an isocyanate component with inorganic particles and a polyol component are processed into a potting compound and the hollow fiber membranes are tightly encased by the potting compound in at least one potting zone by the hardening of said potting compound.

A hollow fiber membrane module 100 includes: a plurality of hollow fiber membranes 10; a container 20 storing the plurality of hollow fiber membranes 10; and a feed water inlet 201 provided at one end portion of the container 20 such that a direction in which feed water flows into the container 20 is parallel to a longitudinal direction of the plurality of hollow fiber membranes 10. A permeation flux of the hollow fiber membranes 10 at a transmembrane pressure difference of 0.1 MPa is higher than or equal to 850 liter/m.sup.2/h.