NOVELTY - A mixture of organic compounds is fractionated to obtain an overhead stream (110) comprising a portion of more volatile components and liquid residue comprising portion of less volatile components. Overhead stream is heated, and processed to obtain liquid condensate. The condensate is used to reflux top of cryogenic distillation column. The mixture effluent is recycled. Thus, useful component(s) are recovered from the mixture containing volatile organic compounds.    USE - For recovering components from mixture containing volatile organic compounds such as fractionation of cracked gas stream containing olefins such as ethylene and/or propylene.    ADVANTAGE - The components are efficiently and economically recovered from the mixture containing volatile organic compounds, with suppressed energy consumption.    DETAILED DESCRIPTION - A fractionation unit comprising a cryogenic distillation column having an overhead outlet and reflux inlet near the top of the column, two or more feed inlets below the reflux inlet, and an outlet for liquid residue from the bottom of the column is provided. A mixture of organic compounds is fractionated to obtain an overhead stream comprising a portion of the more volatile components and a liquid residue comprising a portion of the less volatile components of the mixture. The portion of the overhead stream is heated by indirect heat exchange with a portion (I) of the mixture, and processed to obtain liquid condensate. A favorable portion of the condensate is used to reflux the top of the cryogenic distillation column. Portion (I) of the mixture effluent from the indirect heat exchange is fed into the column at a level below the reflux inlet. Portion (II) of the mixture is directly or indirectly fed into to the column at level below the inlet of portion (I), to recover useful component(s) from a mixture containing volatile organic compounds.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic diagram of recovery of useful components from mixture of organic volatile compounds.    Exchanger (103)    Depropanizer column (105)    Overhead stream (110)    Heated overhead stream (111)    Compressed overhead stream (113)    Partially condensed stream (117)