Patent ID: 6830678
Filing Date: 2004-12-14
Classification: C10G

Abstract:
A process of producing gasoline with a low sulfur content from a gasoline feedstock containing sulfur compounds, diolefins, olefins, aromatics, nitrogen and acetylenic compounds, said process comprising at least the following steps:(a1) conducting at least one selective hydrogenation of diolefins and acetylenic compounds contained in the feedstock, wherein in step (a1) the hydrogen to feedstock ratio is 8-30 liters of hydrogen per liter of feedstock, (b) conducting at least one separation of effluent obtained at the end o step (a1) into at least three fractions: a light fraction containing olefins, and from which substantially all of the sulfur has been removed, a heavy fraction in which most of the sulfur compounds initially contained in the gasoline feedstock is concentrated, and at least one intermediate fraction, (c1) conducting at least one treatment of the heavy fraction separated at step (b) on a catalyst enabling the sulfur compounds to be at least partially decomposed or hydrogenated, and (d) conducting at least one step to remove sulfur and nitrogen from at east one intermediate fraction.