NOVELTY - Separating (M1) hydrocarbons having at least two carbon atoms from natural gas stream involves: subjecting natural gas stream to adsorption step by introducing it into feed input end of adsorbent bed selective for adsorbing hydrocarbons, where adsorbent bed comprises adsorbent material and is operated at first pressure and temperature, where hydrocarbons are selectively adsorbed by adsorbent bed and first methane product stream with higher mol.% of methane than natural gas stream is retrieved; stopping introduction of natural gas stream; depressurizing and recovering product stream.    USE - For separation of hydrocarbons having at least two carbon atoms from a natural gas stream (claimed); for obtaining multiple, high purity hydrocarbon product streams from natural gas stream feeds resulting in a chromatographic-like fractionation with recovery of high purity individual gaseous component streams; for development and production of hydrocarbons, such as gas and oil processing.    ADVANTAGE - The method recovers heavy hydrocarbons from natural gas streams by more economical and efficient processes. The method uses an adsorbent formulated with a microporous zeolite, e.g. having a pore size between 5-20 Angstrom ; produce pure methane stream at relatively high pressure and relatively low pressure stream (e.g. below 100 psig, no more than 75 psig, or no more than 50 psig) containing a mixture of heavy hydrocarbons with reduced methane content. This can significantly reduce the size and energy requirements of downstream cryogenic NGL recovery units. Thus the method can optionally produce several relatively low pressure streams, including sales quality ethane and propane streams. This can greatly reduce the number of cryogenic separation units required for full fractionation and recovery of all natural gas liquid (NGL) components and, can eliminate the need for cryogenic separation units to obtain high purity gas product streams that meet commercial or pipeline specifications. The method separates rapidly and efficiently variety of target gases from gas mixtures in large scale.    DETAILED DESCRIPTION - Separation (M1) of hydrocarbons having at least two carbon atoms from a natural gas stream involves: a) subjecting the natural gas stream to an adsorption step by introducing it into the feed input end of an adsorbent bed selective for adsorbing the hydrocarbons, where the adsorbent bed comprises at least one adsorbent material and feed input end and product output end, and the adsorbent bed is operated at a first pressure and a first temperature, where the hydrocarbons are selectively adsorbed by the adsorbent bed and the first methane product stream having a higher mol.% of methane than the natural gas stream is retrieved from the product output end of the adsorbent bed; b) stopping the introduction of the natural gas stream; c) depressurizing the adsorption bed to a second pressure lower than the first pressure; d) externally heating the depressurized adsorbent bed to a second temperature greater than the first temperature, thus causing at least a fraction of the adsorbed hydrocarbons having at most 2 carbon atoms to desorb from the adsorbent bed; e) counter-currently flowing through the heated adsorbent bed a first purge gas stream at a third pressure; and f) recovering product stream having at least two carbon atoms comprising hydrocarbon components having at least two carbon atoms and methane.