NOVELTY - Generating a carbon dioxide (CO2) product stream (302) involves: generating a liquid acid gas stream (318) comprising hydrogen sulfide (H2S) and CO2; flashing the liquid acid gas stream to form a first vapor stream and a bottom stream; fractionating the bottom stream to form a second vapor stream and a liquid acid waste stream (322); combining the first vapor stream and the second vapor stream to form a combined vapor stream; and treating the combined vapor stream with a physical solvent to remove excess H2S, forming the CO2 product stream.    USE - For generating a carbon dioxide product stream; and for purifying a natural gas stream (claimed).    ADVANTAGE - The present method produces a liquid acid waste stream for easy injection, while producing a clean vapor CO2 stream for enhanced oil recovery (EOR) or other uses. The method also has the ability to remove COS from the CO2 product. The method integrates heat demands and cooling sources to decrease the need for external refrigeration in the separation system. The physical solvent process works best when chilled, since the lower temperature reduces the required solvent circulation rate. Since the acid gas feed is in the liquid phase and needs to be partially vaporized, the feed vaporization requirements can be efficiently matched to the physical solvent chilling requirements. If a warm gas processing system is used, additional refrigeration may be provided to enhance the process.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a system for generating a CO2 enriched stream, comprising an acid gas flash drum configured to flash a portion of a liquid acid gas stream into a vapor stream and a liquid stream; a bulk liquid stripper configured to contact the liquid stream with an acid gas stream and flash at least a portion of the liquid stream into an overhead stream and a bottoms stream, where the overhead stream and the vapor stream are mixed to form a combined gas stream, and where the bottoms stream is disposed of as a concentrated acid gas stream; and an absorption column configured to contact the combined gas stream with a preloaded absorbent stream, where a rich absorbent stream exits the bottom of the absorption column and a CO2 enriched vapor stream exits the top of the column; and    (2) purifying a natural gas stream involving dehydrating the natural gas stream; cryogenically separating the natural gas stream into a methane rich fraction, a natural gas liquids fraction, and a liquid acid gas stream; fractionating the liquid acid gas stream to form a CO2 enriched stream and a liquid acid waste stream; and treating the CO2 enriched stream with an absorbent to remove excess H2S forming a CO2 product stream.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a system that can be used to isolate a CO2 product stream as part of a natural gas purification process.    Carbon dioxide product stream (302)    Dehydration (310)    Liquid acid gas stream (318)    Liquid acid waste stream (322)    Heat (326)