Ionic polymer membranes

An ionic polymer composition comprising repeating structural units that comprise organic ionic moieties consisting of anions and nitrogen containing cations having a ring structure of 5 to 6 members comprising from 1 to 3 nitrogen atoms, and from 2 to 5 carbon atoms.

An ionic polymer composition comprising repeating structural units that comprise organic ionic moieties consisting of anions and nitrogen containing cations having a ring structure of 5 members comprising from 2 or 3 nitrogen atoms, and 2 or 3 carbon atoms.

An ionic polymer composition comprising repeating structural units that comprise organic ionic moieties consisting of anions and nitrogen containing cations having a ring structure of 5 members comprising 1 to 2 nitrogen atoms, 2 to 3 carbon atoms, and a member selected from the group consisting of oxygen and sulfur atoms and an organic nitrogen containing group.

An ionic polymer composition comprising repeating structural units of which at least a plurality are represented by

• where, K+ A− is an organic ionic moiety consisting of a nitrogen containing cation K+ and an anion A−, and R is a organic group comprising 2 or more carbon atoms.

An ionic polymer composition comprising repeating structure units of which at least a plurality are represented by

• where O═C—O—M+ is an ionic moiety wherein M+ is a nitrogen containing cation from an amine, and R is a organic group comprising 2 or more carbon atoms.

An ionic polymer composition comprising repeating structural units comprising one or more nitrogen atoms of which at least a plurality are represented by

• where R is a organic unit comprising 2 or more carbon atoms, and A− is an anion.

A process for making an ionic polymer membrane, which process comprises:

• (a) treating a nitrogen-containing polymeric material with an acid in a liquid system;
• and (b) forming a solid membrane from the treated material.

A process for making an ionic polymer membrane, which process comprises:

• (a) treating a polymeric material comprising a plurality of carboxylate groups with an amine in a liquid system;
• and (b) forming a solid membrane from the treated material.

A process which comprises:

• contacting a fluid mixture of two or more volatile compounds with a first side of a membrane that contains an ionic polymer of repeating structural units having organic ionic moieties consisting of nitrogen containing organic cations or anions;
• maintaining a suitable differential of a driving force across the membrane from the first side to a permeate side opposite thereto, under which differential of a driving force the membrane exhibits a permeability for one of the compounds of the fluid mixture, and recovering one or more compounds from the permeate side of the membrane.