Conversion of h2 and off-gas containing co2 to synfuels

A process for producing a hydrocarbon product stream, in a hydrocarbon plant, said hydrocarbon plant comprising:

• a reverse water gas shift unit,
• a syngas-producing unit,
• optionally, a first feed comprising hydrogen to said reverse water gas shift unit,
• a second feed comprising carbon dioxide to said reverse water gas shift unit,
• a third feed comprising hydrocarbons to said syngas-producing unit,
• a Fischer-Tropsch section,
• said process comprising the steps of:
• a) optionally supplying said first feed comprising hydrogen to said reverse water gas shift unit;
• b) supplying said second feed to said reverse water gas shift unit;
• wherein said second feed is a process off-gas containing less than 75% CO2 and is the sole carbon dioxide-containing feed to said reverse water gas shift unit, and wherein the process off-gas is a process off-gas from a Fischer-Tropsch unit, a process off-gas from a methanol loop unit, or a combination of two or more off-gases from two or more such units;
• c) converting said second feed and—where present—said first feed into a first syngas stream in said reverse water gas shift unit;
• d) supplying said third feed comprising methane to said syngas-producing unit and converting it into a second syngas stream;
• e) supplying at least a portion of said first syngas stream and at least a portion of said second syngas stream to said Fischer-Tropsch section and converting said portions of said first and second syngas streams into at least a hydrocarbon product stream and an F-T off-gas stream.