(WO9837169-A1)      A thermally cracked feedstream containing hydrogen, ethylene, propylene and other 2-6C and heavier unsaturated hydrocarbons produced in thermal cracking is processed to separate ethylene and propylene and hydrogenate unsaturated hydrocarbons without prior separation of hydrogen from feedstream and without hydrogenating ethylene and propylene by: (a) introducing the feedstream into the feed zone of a distillation reaction column containing distillation stripping zone below the feed zone and a combination distillation rectifying and catalytic reaction zone above the feed zone, (b) concurrently: (i) contacting the feedstream in the distillation reaction column with vertically oriented bed of hydrogenation catalyst in the combination reaction zone, (ii) maintaining a high ratio of the total of 4-5C hydrocarbons:2-3C hydrocarbons at the bottom of the catalyst bed where the ethylene and propylene remain unhydrogenated while other unsaturated hydrocarbons are hydrogenated and (iii) fractionating the resulting mixture of hydrogenated and unhydrogenated products, (c) withdrawing an overhead stream containing 2-4C hydrocarbons and part of the 5C hydrocarbons and a bottoms stream containing the 6C+ hydrocarbons and part of the 5C hydrocarbons and (d) processing the overhead stream to recover ethylene and propylene.    USE -   For processing thermally cracked feedstream to recover ethylene and propylene and produce gasoline products.    ADVANTAGE -   Process does not hydrogenate ethylene and propylene and does not require prior removal of hydrogen thus reducing costs and energy requirements. Fouling is minimised.    (EP961819-A1)      A thermally cracked feedstream containing hydrogen, ethylene, propylene and other 2-6C and heavier unsaturated hydrocarbons produced in thermal cracking is processed to separate ethylene and propylene and hydrogenate unsaturated hydrocarbons without prior separation of hydrogen from feedstream and without hydrogenating ethylene and propylene by: (a) introducing the feedstream into the feed zone of a distillation reaction column containing distillation stripping zone below the feed zone and a combination distillation rectifying and catalytic reaction zone above the feed zone, (b) concurrently: (i) contacting the feedstream in the distillation reaction column with vertically oriented bed of hydrogenation catalyst in the combination reaction zone, (ii) maintaining a high ratio of the total of 4-5C hydrocarbons:2-3C hydrocarbons at the bottom of the catalyst bed where the ethylene and propylene remain unhydrogenated while other unsaturated hydrocarbons are hydrogenated and (iii) fractionating the resulting mixture of hydrogenated and unhydrogenated products, (c) withdrawing an overhead stream containing 2-4C hydrocarbons and part of the 5C hydrocarbons and a bottoms stream containing the 6C+ hydrocarbons and part of the 5C hydrocarbons and (d) processing the overhead stream to recover ethylene and propylene.    USE -   For processing thermally cracked feedstream to recover ethylene and propylene and produce gasoline products.    ADVANTAGE -   Process does not hydrogenate ethylene and propylene and does not require prior removal of hydrogen thus reducing costs and energy requirements. Fouling is minimised.    (CN1246140-A)      A thermally cracked feedstream containing hydrogen, ethylene, propylene and other 2-6C and heavier unsaturated hydrocarbons produced in thermal cracking is processed to separate ethylene and propylene and hydrogenate unsaturated hydrocarbons without prior separation of hydrogen from feedstream and without hydrogenating ethylene and propylene by: (a) introducing the feedstream into the feed zone of a distillation reaction column containing distillation stripping zone below the feed zone and a combination distillation rectifying and catalytic reaction zone above the feed zone, (b) concurrently: (i) contacting the feedstream in the distillation reaction column with vertically oriented bed of hydrogenation catalyst in the combination reaction zone, (ii) maintaining a high ratio of the total of 4-5C hydrocarbons:2-3C hydrocarbons at the bottom of the catalyst bed where the ethylene and propylene remain unhydrogenated while other unsaturated hydrocarbons are hydrogenated and (iii) fractionating the resulting mixture of hydrogenated and unhydrogenated products, (c) withdrawing an overhead stream containing 2-4C hydrocarbons and part of the 5C hydrocarbons and a bottoms stream containing the 6C+ hydrocarbons and part of the 5C hydrocarbons and (d) processing the overhead stream to recover ethylene and propylene.    USE -   For processing thermally cracked feedstream to recover ethylene and propylene and produce gasoline products.    ADVANTAGE -   Process does not hydrogenate ethylene and propylene and does not require prior removal of hydrogen thus reducing costs and energy requirements. Fouling is minimised.    (RU2167188-C1)      A thermally cracked feedstream containing hydrogen, ethylene, propylene and other 2-6C and heavier unsaturated hydrocarbons produced in thermal cracking is processed to separate ethylene and propylene and hydrogenate unsaturated hydrocarbons without prior separation of hydrogen from feedstream and without hydrogenating ethylene and propylene by: (a) introducing the feedstream into the feed zone of a distillation reaction column containing distillation stripping zone below the feed zone and a combination distillation rectifying and catalytic reaction zone above the feed zone, (b) concurrently: (i) contacting the feedstream in the distillation reaction column with vertically oriented bed of hydrogenation catalyst in the combination reaction zone, (ii) maintaining a high ratio of the total of 4-5C hydrocarbons:2-3C hydrocarbons at the bottom of the catalyst bed where the ethylene and propylene remain unhydrogenated while other unsaturated hydrocarbons are hydrogenated and (iii) fractionating the resulting mixture of hydrogenated and unhydrogenated products, (c) withdrawing an overhead stream containing 2-4C hydrocarbons and part of the 5C hydrocarbons and a bottoms stream containing the 6C+ hydrocarbons and part of the 5C hydrocarbons and (d) processing the overhead stream to recover ethylene and propylene.    USE -   For processing thermally cracked feedstream to recover ethylene and propylene and produce gasoline products.    ADVANTAGE -   Process does not hydrogenate ethylene and propylene and does not require prior removal of hydrogen thus reducing costs and energy requirements. Fouling is minimised.