A method for separating a feed stream comprising propylene and propane using a separation system for separating a feed stream comprising propylene and propane, the system comprising: i) a distillation column (C-301) for producing a light stream comprising propylene and a heavy stream comprising propane (302,312), ii) a reboiler (H-301) for reboiling a part of the first heavy stream to produce a boiled heavy stream, iii) a condenser (H-302) for cooling the light stream to produce a condensed light stream and iv) an absorption refrigerator (Y-301) for receiving water and providing chilled water by the vaporization of a circulating refrigerant, wherein the absorption refrigerator (Y-301) is arranged to receive hot water from a waste heat source to provide heat for the circulation of the refrigerant, and provide cooled hot water, wherein the condenser (H-302) is arranged such that the cooling of the light stream occurs by the chilled water from the absorption refrigerator (Y-301) and wherein the chilled water from the absorption refrigerator (Y-301) has a temperature of at most 15 °C, wherein the method comprises the steps of: a) feeding the feed stream to the distillation column (C-301) and collecting a part of the first heavy stream from the separation system, b) feeding a part of the heavy stream to the reboiler (H-301) and feeding back the boiled heavy stream to the distillation column (C-301) and c) feeding back a part of the condensed light stream to the distillation column (C-301) as reflux and collecting a part of the condensed light stream from the separation system, wherein the cooled hot water from the absorption refrigerator (Y-301) is fed to the reboiler for providing heat for producing the boiled heavy stream, and wherein the hot water is quench water which has been heated by means of heat recovery or quench water used in a steam cracking process and has a temperature of 75-85 °C. i) a distillation column (C-301) for producing a light stream comprising propylene and a heavy stream comprising propane (302,312), ii) a reboiler (H-301) for reboiling a part of the first heavy stream to produce a boiled heavy stream, iii) a condenser (H-302) for cooling the light stream to produce a condensed light stream and iv) an absorption refrigerator (Y-301) for receiving water and providing chilled water by the vaporization of a circulating refrigerant, wherein the absorption refrigerator (Y-301) is arranged to receive hot water from a waste heat source to provide heat for the circulation of the refrigerant, and provide cooled hot water, wherein the condenser (H-302) is arranged such that the cooling of the light stream occurs by the chilled water from the absorption refrigerator (Y-301) and wherein the chilled water from the absorption refrigerator (Y-301) has a temperature of at most 15 °C, wherein the method comprises the steps of: a) feeding the feed stream to the distillation column (C-301) and collecting a part of the first heavy stream from the separation system, b) feeding a part of the heavy stream to the reboiler (H-301) and feeding back the boiled heavy stream to the distillation column (C-301) and c) feeding back a part of the condensed light stream to the distillation column (C-301) as reflux and collecting a part of the condensed light stream from the separation system, wherein the cooled hot water from the absorption refrigerator (Y-301) is fed to the reboiler for providing heat for producing the boiled heavy stream, and wherein the hot water is quench water which has been heated by means of heat recovery or quench water used in a steam cracking process and has a temperature of 75-85 °C. wherein the chilled water from the absorption refrigerator (Y-301) has a temperature of at most 15 °C, wherein the method comprises the steps of: a) feeding the feed stream to the distillation column (C-301) and collecting a part of the first heavy stream from the separation system, b) feeding a part of the heavy stream to the reboiler (H-301) and feeding back the boiled heavy stream to the distillation column (C-301) and c) feeding back a part of the condensed light stream to the distillation column (C-301) as reflux and collecting a part of the condensed light stream from the separation system, a) feeding the feed stream to the distillation column (C-301) and collecting a part of the first heavy stream from the separation system, b) feeding a part of the heavy stream to the reboiler (H-301) and feeding back the boiled heavy stream to the distillation column (C-301) and c) feeding back a part of the condensed light stream to the distillation column (C-301) as reflux and collecting a part of the condensed light stream from the separation system, wherein the cooled hot water from the absorption refrigerator (Y-301) is fed to the reboiler for providing heat for producing the boiled heavy stream, and wherein the hot water is quench water which has been heated by means of heat recovery or quench water used in a steam cracking process and has a temperature of 75-85 °C.