Abstract:
A process for treating pyrolysis gasoline that includes providing a first stage di-olefin reactor that includes a first bed and a second bed and introducing a pyrolysis gasoline stream to the first bed of the first stage di-olefin reactor. The process also preferably includes providing interstage cooling to the pyrolysis gasoline stream between the first and second beds of the first stage di-olefin reactor and routing the cooled pyrolysis gasoline stream through the second bed of the first stage di-olefin reactor. Finally, embodiments of the process also preferably involve routing at least a portion of an effluent stream from the second bed of the first stage di-olefin reactor to a location upstream of the first bed of the first stage di-olefin reactor, such that the effluent stream is configured to be combined with the pyrolysis gasoline stream.
Abstract:
L'invention concerne un procédé d'hydrotraitement d'une essence oléfinique, comprenant au moins une étape d'hydrogénation sélective, et généralement de transformation simultanée de mercaptans par alourdissement, dans lequel l'hydrogène d'appoint utilisé au niveau de cette ou ces étapes a une teneur réduite en CO + CO2 comprise entre 5 et 200 ppmv. La teneur en CO est comprise entre 1 et 20 ppmv. Le procédé permet typiquement d'hydroraffiner une essence oléfinique en éliminant sensiblement les dioléfines et les composés soufrés.
Abstract:
A catalytic cracked naphtha is desulfurized with minimum loss of olefins and octane. The naphtha is fed to a first distillation column reactor (10) which acts as a depentanizer or dehexanizer with the lighter material containing most of the olefins and mercaptans being boiled up into a first distillation reaction zone (11) where the mercaptans are reacted with diolefins to form sulfides which are removed in the bottoms along with any higher boiling sulfur compounds. The bottoms are subjected to hydrodesulfurization in a second distillation column reactor (20) where the sulfur compounds are converted to H2S and removed. The lighter fraction containing most of the olefins is thus not subjected to the more harsh hydrogenation conditions of the second reactor (20).
Abstract:
Verfahren zur Aufbereitung von Rohbenzol (1), das bei der Verkokung kohlenstoffhaltiger Materialien, insbesondere von Kohle, anfällt, mittels katalytischer Vor- und Haupthydrierung unter Druck bei erhöhten Temperaturen in Gegenwart von Wasserstoff, bei dem das Rohbenzol einer Destillation unter Vakuum (2) bei Temperaturen von
Abstract:
Olefins in a gasoline boiling range feed stream also containing highly unsaturated hydrocarbons are selectively isomerized by a two step process involving treating the feed stream to reduce the content of highly unsaturated hydrocarbons to form a stable olefinic stream and thereafter contacting the stabilized olefinic stream with an isomerization catalyst containing at least one medium pore molecular sieve at olefin isomerization conditions effective to produce an isomerized product stream having a ratio of branched to unbranched olefins of at least 2:1. The process features yields of C₅+ isomerized product and avoids conversion of highly branched paraffins to equilibrium values.