Membrane permeation gas separation method

A membrane permeation gas separation method, comprising:

• passing a gas mixture, comprising CO2 and at least one additional gas, through a gas filter to form a permeate that is enriched in CO2 content and a gaseous composition having a concentration of CO2 that is less than a concentration of CO2 in the gas mixture,
• wherein the gas filter comprises:
• a plurality of multilayered membranes fixed inside a cell;
• wherein each multilayered membrane of the plurality of multilayered membranes comprises:
• a first layer, comprising at least 50 wt. % of polysulfone;
• a second layer, comprising at least 50 wt. % of a polyamide comprising, in condensation polymerized form, piperazine and isophthaloyl chloride;
• and
• TiC-derived nanoparticles,
• wherein the TiC-derived nanoparticles are embedded in the second layer in an amount of from 0.1 to 0.5 wt. %, based on a total weight of the second layer,
• wherein the first layer directly contacts the second layer.