Hydrocarbon conversion process using a plurality of synthesis gas sources

A process for converting light hydrocarbons into heavier hydrocarbons (C5+), the process comprising the steps of:

• using a first synthesis gas unit to prepare a first synthesis gas having a H2:CO ratio greater than 2:1;
• using a second synthesis gas unit, which has a CO2 recycle, to prepare a second synthesis gas, wherein the second synthesis gas has a H2:CO ratio less than 2:1;
• removing a portion of the hydrogen from the first synthesis gas;
• adding the removed hydrogen to the second synthesis gas to increase the H2:CO ratio of the second synthesis gas;
• using a first Fischer-Tropsch synthesis unit to convert the first synthesis gas into heavier hydrocarbons and a first tail gas;
• using a second Fischer-Tropsch synthesis unit to convert the second synthesis gas into heavier hydrocarbons and a second tail gas;
• removing CO2 from the second tail gas;
• delivering the removed CO2 to the second synthesis gas unit for use therein in producing the second synthesis gas.

A system for converting light hydrocarbons into heavier hydrocarbons (C5+), the system comprising:

• a first synthesis gas unit having a steam methane reformer for receiving steam, light hydrocarbons, and air and producing a first synthesis gas;
• a hydrogen separator fluidly coupled to the first synthesis gas unit for removing at least a portion of the hydrogen from a first synthesis gas to make a hydrogen-reduced synthesis gas;
• a second synthesis gas unit having an autothermal reformer for receiving an oxygen-containing gas, light hydrocarbons, and carbon dioxide and producing a second synthesis gas;
• a first synthesis unit fluidly coupled to the hydrogen separator for receiving a hydrogen-reduced synthesis gas and producing heavier hydrocarbons;
• a second synthesis unit fluidly coupled to the second synthesis gas unit and hydrogen separator for receiving a second synthesis gas from the second synthesis gas unit and hydrogen from the hydrogen separator unit and producing heavier hydrocarbons;
• and
• a carbon dioxide removal unit coupled to the second synthesis unit for receiving a second tail gas from the second synthesis unit and removing carbon dioxide from the tail gas and delivering carbon dioxide to the second synthesis gas unit.