Patent ID: 8147787

Claim:
A fuel gas treatment system comprising: a lean oil scrubbing unit configured to allow removal of C5+ components from a fuel gas and to allow production of a rich oil and a scrubbed fuel gas; a hydrotreater fluidly and downstream coupled to the scrubbing unit and configured to receive a mixture of the scrubbed fuel gas and a recycle lean oil and to allow hydrotreating the mixture of the scrubbed fuel gas and the recycle lean oil to thereby form a hydrotreated gas effluent; a separator fluidly and downstream coupled to the hydrotreater and configured to receive the hydrotreated gas effluent, and further configured to form a gas phase and the recycle lean oil; and a recycle conduit fluidly coupled to the separator and configured to allow recycling of the recycle lean oil to the hydrotreater to a location and in an amount effective to maintain hydrotreater temperature via evaporation of the recycle lean oil at a predetermined value.