CERAMIC MEMBRANE AND METHOD OF ITS PRODUCTION Russian patent published in 2015 - IPC B01D53/22 B01D71/02 B01D63/02 B82B1/00 

FIELD: chemistry.

SUBSTANCE: ceramic membrane, applied for the separation of gas mixtures, has the following composition, wt %: aluminium oxide 30-54; sodium silicate 42-68; carbon nanotubes CNT with an external diameter of 1-5 nm with a three-layer structure and a specific surface of 350-1000 m²/g 1-4. The method of preparing the ceramic membrane for the separation of gas mixtures includes mixing of thermoactivated gibbsite - Al(OH)₃ with sodium silicate and the carbon nanotubes CNT with an external diameter of 1-5 nm with the three-layer structure and the specific surface of 350-1000 m²/g, following addition of a nitric acid solution. The obtained mass is thoroughly mixed and an excess of moisture is removed until powder has a half-dry condition. The obtained powder is pressed, the pressed tablets are subjected to thermal-processing - first, they are exposed at a temperature of not higher than 150°C, then at a temperature of not higher than 400°C. The obtained membrane in the form of a tablet is annealed without air access at 850-1100°C.

EFFECT: increased factor of the gas mixture separation.

2 cl, 3 dwg, 2 tbl, 5 ex