Method for producing ceramic capillaries, comprises producing green hollow fibers by extruding a composition and fastening a suitable number of hollow fibers at both ends of the capillaries in fastening elements in stretched condition

摘要

The method for producing ceramic capillaries, comprises producing green hollow fibers by extruding a composition having a ceramic in addition to a polymer, fastening a suitable number of hollow fibers at both ends of the capillaries in fastening elements in stretched condition, relaxing the two-sidedly fixed hollow fibers in axial direction by reducing the distance of the fastening elements to each other in ideal manner, rotating the fastening elements against each other and bringing a holding device with the hollow fibers in a burning or a sintering furnace and then sintering the fibers. The method for producing ceramic capillaries, comprises producing green hollow fibers by extruding a composition having a ceramic in addition to a polymer, fastening a suitable number of hollow fibers at both ends of the capillaries in fastening elements in stretched condition, relaxing the two-sidedly fixed hollow fibers in axial direction by reducing the distance of the fastening elements to each other in ideal manner, rotating the fastening elements against each other and bringing a holding device with the hollow fibers in a burning or a sintering furnace and then sintering the fibers. The hollow fibers have desired cross section geometry and are held in the holding device at both ends of the capillaries during sintering in the furnace, so that the hollow fibers have a non-stretched form. The both ends of the capillaries are fixed and distorted against each other in the holding device during the sintering, so that the capillary axis runs in the form of a screw or helix and remains to receive the form after the sintering. The capillaries cling to begin the sintering at a mold core, which represents a part of the holding device. The mold core is produced from a cellulose fiber and ideally from the same polymer or polymer mixture, which lies in the green hollow fibers. The mold core is transported in the flow of the sintering in a non-solid form, in which the mold core is partially liquefied and/or is transported in a gaseous condition. The fastening elements represent parts of the holding device and are rotated around 30-360[deg] against the other fastening element, until the hollow fibers lie on the mold core and have a screw-shaped or a helical preferential form. The hollow fibers are held in the region of the rotational axis or on the concentric circles around the rotational axis and are arranged to a further mold core between the fastening elements. The mold core has a rotationally symmetric form and a bulgy form in ideal manner. The holding device is vibrated during relaxing. Independent claims are included for: (1) process for bringing a holding device with the hollow fibers in a burning or a sintering furnace; and (2) a membrane reactor.