Ceramic membranes

We have established a wet-spinning process for the production of asymmetric ceramic capillary membranes. Capillaries with outer diameters in the range of 0.5 to 4 mm and wall thicknesses from 50 to 500 μm are available. In a first step microfiltration membranes are obtained which can be further modified by a coating with selective layers. Beside oxide ceramics also other ceramics (e.g. SiC) and even metals (e.g. stainless steel) can be processed. Production capacities range from just a few meters on laboratory scale to pilot plant application.

If functional ceramics, like perovskites are used, dense capillary membranes can be obtained after sintering. The geometry of the capillaries can be influenced both by different spinnerets as well as spinning parameters. High oxygen permeation can be achieved by such mixed ionic and electronic conducting materials. Due to the lattice transport of oxygen in the dense material the selectivity of O2 to N2 is infinite. Therefore dense perovskite capillaries are of interest as membranes for syngas production (gas partial oxidation), as a provider for pure O2 or for the oxyfuel process.

Our research

Rotating disk filter

A rotating disk filter, which efficiently controls the thickness of the particle layer. Hereby, the filter opens up new applications for filtration such as industrial and municipal wastewater treatment with very high solid contents.

Ceramic hollow fiber membranes

Ceramic capillaries are used for liquid filtration in the food, chemical or pharmaceutical industry. For these applications Fraunhofer IGB develops ceramic hollow fibers with high packing densities.

Perovskite oxygen-conducting capillary membranes

During the past few years mixed conductive perovskites have increasingly come into focus as membrane materials for the selective separation of oxygen from air-gas mixtures.

Dense metal membranes for hydrogen purification

Membranes for the separation of hydrogen from other gases.