Conversion of a hydrocarbon feed gas to synthesis gas for producing hydrocarbons

A method for producing a synthesis gas for use in the production of a hydrocarbon product, comprising the steps of:

• providing a hydrocarbon feed gas,
• providing a first oxygen rich stream by passing air through an air separation unit (ASU),
• carrying out autothermal reforming of said hydrocarbon feed gas in an autothermal reforming (ATR) unit, said autothermal reforming including using at least a portion of said first oxygen rich stream to produce said synthesis gas,
• providing at least part of said synthesis gas to a synthetic fuel synthesis unit for converting said synthesis gas into said hydrocarbon product and producing a tail gas,
• recycling a part or an entirety of said tail gas to upstream of said ATR,
• providing a first hydrogen rich stream and a second oxygen rich stream, wherein the step of providing said first hydrogen rich stream and said second oxygen rich stream is conducted by electrolysis of a water feedstock,
• adding at least a portion of said first hydrogen rich stream to said synthesis gas prior to entering said synthetic fuel synthesis unit,
• adding at least a portion of said second oxygen rich stream to said autothermal reforming step, and
• providing a second hydrogen rich stream by steam methane reforming of a hydrocarbon feed gas, wherein said steam methane reforming is conducted by eSMR (electrically heated reforming reactor).