NOVELTY - Producing (p1) and isolating two carbon containing (C2) composition comprises: (a) providing hydrocarbon reactant and oxidant, where hydrocarbon reactant comprises greater than or equal to 10 mole% methane; (b) catalytically converting hydrocarbon reactant's methane in the presence of oxidant and hydrocarbon conversion catalyst to produce a reaction mixture comprised of a C2 composition, carbon dioxide and unconverted methane; and (c) exposing reaction mixture to sorbent to remove reaction mixtures C2 composition to produce a C2 lean mixture.    USE - The process is useful for producing and isolating two carbon containing composition (claimed) and converting methane to ethylene and propylene.    ADVANTAGE - The process: is less energy intensive, that is more energy efficient; exhibits increased selectivity towards ethylene; and allows non-cryogenic separation of two carbon containing composition from hydrocarbons.    DETAILED DESCRIPTION - Producing (p1) and isolating a two carbon containing (C2) composition comprises: (a) providing a hydrocarbon reactant and an oxidant, where the hydrocarbon reactant comprises greater than or equal to 10 mole% methane; (b) catalytically converting at least a portion of the hydrocarbon reactant's methane in the presence of the oxidant and a hydrocarbon conversion catalyst to produce a reaction mixture comprised of a C2 composition produced by the catalytic conversion, carbon dioxide produced during the catalytic conversion, and unconverted methane; and (c) exposing the reaction mixture to at least one sorbent under kinetic sorption conditions to selectively remove at least a portion of the reaction mixtures C2 composition from the reaction mixture to produce a C2 lean mixture, where the C2 lean mixture comprises at least a portion of the unconverted methane and has a C2 content that is less than that of the reaction mixture, and the sorbent comprises C2 selective sorbent having a selectivity for ethane and ethylene over that of methane that is greater than 1. INDEPENDENT CLAIMS are also included for:    (1) producing (p2) and isolating a C2 composition;    (2) a hydrocarbon conversion (p3) process;    (3) producing (p4) and isolating a C2 composition, comprising: providing a hydrocarbon reactant and an oxidant, where the hydrocarbon reactant comprises greater than or equal to 10 mole% alkane; catalytically converting at least a portion of the hydrocarbon reactant's alkane in the presence of the oxidant and a hydrocarbon conversion catalyst to produce a reaction mixture comprised of C2 composition produced by the catalytic conversion, water and/or carbon dioxide produced during the catalytic conversion, and unconverted alkane; and exposing the reaction mixture under kinetic sorption conditions to at least one sorbent to selectively remove at least a portion of the reaction mixtures C2 composition from the reaction mixture to produce a C2 lean mixture, where the C2 lean mixture comprises at least a portion of the unconverted alkane and has a C2 content that is less than that of the reaction mixture, and the sorbent comprises at least one C2 selective sorbent having a selectivity for ethane and ethylene over that of methane that is greater than 1;    (4) a hydrocarbon conversion system for producing a C2 composition, comprising: a reactor comprising a first region having a first thermal mass and a first aperture, a second region having a second thermal mass and a second aperture, and a catalytic conversion zone containing catalyst having an oxidative coupling functionality and/or oxydehydrogenation functionality, with at least a portion of the catalyst being deposited on or in at least one of the first thermal mass and second thermal mass, where the first and second regions are configured for flowing a feed mixture to enter the reactor proximate to the first aperture, with at least one component of a reaction mixture exiting the reactor proximate to the second aperture; and a sorption system operating under kinetic sorption conditions in fluid communication with the second aperture for receiving at least a portion of the catalytically converted reaction mixture, where the sorption system includes at least one C2 selective sorbent; and    (5) a reverse-flow hydrocarbon conversion system for producing a C2 composition, comprising: a reverse-flow reactor comprising first region having the first thermal mass and a first aperture, a second region having the second thermal mass and a second aperture, and a catalytic conversion zone containing catalyst having an oxidative coupling functionality and/or oxydehydrogenation functionality, with at least a portion of the catalyst being deposited on or in at least one of the first thermal mass and second thermal mass, where the first and second regions are configured for flowing a first flow of a first feed mixture to enter the reactor proximate to the first aperture, with at least one component of a first reaction mixture exiting the reactor proximate to the second aperture, and for flowing a second flow of a second feed mixture to enter the reactor proximate to the second aperture, with at least one component of the second reaction mixture exiting the reactor proximate to the first aperture; and a sorption system operating under kinetic sorption conditions in fluid communication the first and second apertures for receiving at least a portion of the catalytically converted first and second reaction mixtures.