HIGH-TEMPERATURE GAS-SEPARATING MEMBRANE BASED ON POLYNAPHTOYLENEBENZIMIDAZOLE AND METHOD FOR ITS PRODUCTION Russian patent published in 2023 - IPC B01D71/64 C08G73/18 

FIELD: membranes.

SUBSTANCE: invention relates to polymer membranes for separation of gas mixtures, including high-temperature separation processes, and/or mixtures of gases and vapors of organic solvents and can be used in the processes of steam and gas separation and concentration used in the chemical, petrochemical, oil refining, gas chemical and gas processing industry. A high-temperature gas separation membrane based on partial ladder polynaphthoylenebenzimidazoles with the general structural formula is described. where R=-(σ-bond), -О-, -СН₂-, -C(CF₃)₂-, -SO₂-, -СO-; with intrinsic viscosity [η], equal to 1.0-3.0 dl/g, and molecular weight M_w equal to 30,000-150,000. A method for producing a high-temperature gas-separating membrane based on partially laddered polynaphthoylenebenzimidazole is also proposed. EFFECT: providing heat-resistant, mechanically strong membranes for high-temperature processes (150-400°C), separation of gas mixtures with a unique set of gas separation characteristics.

EFFECT: the gas permeability and selectivity of the proposed membranes exceed the level of Upilex-R and Matrimid 5218 analogue membranes for various gas pairs most commonly encountered in industry, and strong inorganic acids (sulfuric, phosphoric, methanesulfonic, etc.) are not used as solvents when obtaining the membrane material), which simplifies, reduces the cost and makes the process of obtaining the proposed membrane environmentally friendly.

3 cl, 4 dwg, 9 tbl, 6 ex