NOVELTY - Processing Fischer-Tropsch off-gas (1) involves: catalytic converting synthesis gas using catalyst into Fischer-Tropsch product; separating Fischer-Tropsch product into hydrocarbon product stream (2) and Fischer-Tropsch off-gas; contacting off-gas with wash fluid in scrubber (20); removing fluid and 3C+ hydrocarbons of off-gas; separating hydrocarbon product stream into light streams and heavy stream (3); subjecting heavy stream to hydrocracking and/or hydrocracking/hydroisomerization; and separating formed product (4) into at least two streams and recycling one stream (16) as wash fluid.    USE - For processing a Fischer-Tropsch off-gas (claimed).    ADVANTAGE - The part of the valuable 3C+ hydrocarbons is removed from the Fischer-Tropsch off-gas before the off-gas is used as fuel or before it is disposed of. The process recovers hydrocarbons from Fischer-Tropsch off-gas; and recovers or removes 3C+ hydrocarbons from Fischer-Tropsch off-gas comprising hydrogen, carbon monoxide, carbon dioxide, nitrogen, and 3C+ hydrocarbons and additionally methane, hydrocarbons comprising 2 carbon atoms, and/or argon.    DETAILED DESCRIPTION - Processing a Fischer-Tropsch off-gas (1), involves: a) catalytic conversion of synthesis gas using a Fischer-Tropsch catalyst into a Fischer-Tropsch product; b) separating the Fischer-Tropsch product of step a) into at least one hydrocarbon product stream (2) and a Fischer-Tropsch off-gas, where the Fischer-Tropsch off-gas comprising hydrogen, carbon monoxide, carbon dioxide, nitrogen, and 3C+ hydrocarbons; c) contacting at least a part of the Fischer-Tropsch off-gas obtained in step b), optionally after cooling, with a wash fluid in a scrubber (20); d) removing wash fluid and at least a portion of the 3C+ hydrocarbons of the off-gas in a stream from the scrubber of step c); e) removing the remaining off-gas in a separate stream from the scrubber of step c); f) providing a feed comprising at least a part of the hydrocarbon product stream obtained in step b) and a feed comprising at least a part of the stream obtained in step d) to a separator (30), or providing a feed comprising at least a part of the hydrocarbon product stream obtained in step b) and at least a part of the stream obtained in step d) to a separator; g) separating at least a part of the hydrocarbon product stream obtained in step b) and at least a part of the stream obtained in step d) in the separator of step f) into at least one light stream and one heavy stream (3), where the light stream preferably comprising carbon monoxide and carbon dioxide and the heavy stream preferably comprising hydrocarbons with at least 3 carbon atoms; h) subjecting at least a part of the heavy stream obtained in step g) to hydrocracking and/or hydrocracking/hydroisomerization; i) separating at least a part of the hydrocracked and/or hydrocracked/hydroisomerized product (4) obtained in step h) into at least two streams; j) using at least a part of one of the streams (16) obtained in step i) as wash fluid in step c).    DESCRIPTION OF DRAWING(S) - The figure shows an overview of the process steps of the method for processing Fischer-Tropsch off-gas.    Fischer-Tropsch off-gas (1)    Hydrocarbon product stream (2)    Heavy stream (3)    Hydrocracked and/or hydrocracked/hydroisomerized product (4)    Scrubber (20)    Separator. (30)