The current invention relates to a method for the production of a filtration membrane envelope comprising a 3D spacer fabric interposed between two membrane layers cast onto said 3D spacer fabric, wherein said method comprises a casting step, wherein during said casting step a polymer solution is applied to the outer surface of said 3D spacer fabric, wherein said polymer is applied by means of an injection process by means of a casting module and wherein said excess of coating material is removed by a casting head comprising a casting head, wherein prior or during the casting process the variation in thickness, roughness and/or tapering of the fabric is measured and the distance between the 3D fabric and the casting head is adjusted based on said measurement.

The invention disclosed herein generally relates to matrices comprising polymers and methods for preparing them.

Sorbent polymer composites and a solution-casting method of making hydrophobic sorbent polymer composites for CO.sub.2 adsorption applications are described. The sorbent polymer composites are comprised of a polymer matrix, a dispersed CO.sub.2 sorbent, and an optional filler particle for hydrophobicity modification.

A membrane, for example a flat sheet membrane, has posts extending from a separation layer. The posts extend through one or more supporting structures such as a substrate layer and/or a permeate carrier, between two separation layers, or both. A post may help to attach the separation layer to a supporting structure, attach two supporting structures together, strengthen a supporting structure and/or attach two separation layers together. In some examples, one or more supporting structures, which may be temporary or remain in the membrane, are made with openings for posts. A liquid containing the separating layer material is cast over the supporting structure or structures and some of the liquid flows at least part way through the openings before the liquid is solidified. A temporary supporting structure may be removed, for example dissolved. In other examples, two supporting structures are held apart in a casting knife while posts are formed.