Enhanced GTL process

摘要

A process for converting carbonaceous materials or light hydrocarbon gases into products comprising predominately C5+ hydrocarbons. The process converts the feedstock into synthesis gas comprising hydrogen and carbon monoxide and then uses the Fischer-Tropsch reaction to produce heavy hydrocarbons. A small excess of hydrogen is produced in the syngas generator or by water gas shift for use in product upgrading and for blending with Fischer-Tropsch tail gas for recycle back to syngas generation. A portion of the Fischer-Tropsch tail gas is used as fuel, thus purging combustible light gases and CO2 from the tail gas. Hydrogen rich purge gas is blended into the remaining tail gas resulting in a recycle stream that is returned to the syngas generator. The tail gas components are therefore efficiently used to produce more products.

主权项

1. A process to convert carbonaceous materials and/or light hydrocarbon gases or combinations thereof into heavy hydrocarbon products, which process comprises:
a) converting carbonaceous materials and/or light hydrocarbon gases to synthesis gas with a H2:CO ratio greater than 2.0; b) separating a part of the hydrogen from the synthesis gas of step (a); c) passing all or a portion of the synthesis gas after hydrogen separation over a cobalt based Fischer-Tropsch catalyst in a Fischer-Tropsch reactor operating at or below the stoichiometric H2:CO ratio, resulting in the production of heavy hydrocarbon products, water and a tail gas comprising mainly light hydrocarbon gases, unreacted syngas, and CO2; d) using a portion of the H2 of step (b) for hydroprocessing the Fischer-Tropsch hydrocarbon products; e) using a portion of the Fischer-Tropsch tail gas as fuel, thus purging CO2 from the tail gas; and f) mixing all or a part of any remaining H2 from step (b) not used for hydroprocessing with all or a part of any remaining Fischer-Tropsch tail gas not used as fuel and recycling this mixed gas stream to step (a).