Relating to gas separation

A method of obtaining a target gas from a gaseous composition comprising the target gas, a first gas and a second gas, the method comprising the step of contacting the gaseous composition with a sorbent media to remove at least some of the first gas and at least some of the second gas from the gaseous composition;

• wherein the sorbent media comprises a first sorbent material and a second sorbent material;
• wherein the sorbent media comprises the first and second sorbent materials, and any further sorbent materials, in discrete sections arranged in series;
• wherein the first sorbent material is an ultramicroporous material comprising a metal organic material, a metal organic framework material, or a porous coordination polymer material and having pores of an average diameter of less than 0.7 nm and has a higher adsorption selectivity for the first gas than for the target gas;
• wherein the second sorbent material is an ultramicroporous material comprising a metal organic material, a metal organic framework material, or a porous coordination polymer material and having pores of an average diameter of less than 0.7 nm and has a higher adsorption selectivity for the second gas than for target gas;
• wherein the target gas is a C1-4 hydrocarbon;
• and wherein the second gas is ethane.