Abstract:
The invention relates to a method for capturing organometallic impurities in a gasoline-type hydrocarbon feedstock containing sulfur compounds and olefins, wherein said feedstock is brought into contact with hydrogen and a capture mass comprising a nickel-based active phase, and a mesoporous and macroporous alumina substrate having a bimodal distribution of mesopores and wherein: —the volume of mesopores having a diameter greater than or equal to 2 nm and less than 18 nm corresponds to between 10 and 30% by volume of the total pore volume of said substrate; —the volume of mesopores with a diameter greater than or equal to 18 nm and less than 50 nm corresponds to between 30 and 50% by volume of the total pore volume of said substrate.
Abstract:
The present application relates to a method for treating a petrol containing sulphur compounds, olefins and diolefins, the method comprising the following steps: a) a step of hydrodesulphurisation in the presence of a catalyst comprising an oxide support and an active phase comprising a group VIB metal and a group VIII metal from, b) a step of hydrodesulphurising at least one portion of the effluent from step a) at a higher hydrogen flow rate/feed ratio and a temperature higher than those of step a) without removing the H2S formed in the presence of a catalyst comprising an oxide support and an active phase consisting of at least one group VIII metal, c) a step of separating the H2S formed in the effluent from step b).
Abstract:
The present invention relates to zeolitic adsorbents based on small agglomerated crystals of zeolite X comprising barium, combining optimum properties in terms of selectivity and of mechanical strength.These adsorbents have applications in the separation of fractions of aromatic C8 isomers and in particular xylenes, in the separation of substituted toluene isomers, such as nitrotoluene, diethyltoluene or toluenediamine, in the separation of cresols and in the separation of polyhydric alcohols, such as sugars.
Abstract:
A process for the treatment of a gasoline containing sulphur-containing compounds, olefins and diolefins, comprising the following steps: a) fractionating the gasoline in a manner such as to recover at least one intermediate gasoline cut, MCN, comprising hydrocarbons and wherein the temperature difference (ΔT) between the 5% and 95% by weight distillation points is less than 60° C.; b) desulphurizing the intermediate gasoline cut MCN alone and in the presence of a hydrodesulphurization catalyst and hydrogen in a manner such as to produce a partially desulphurized intermediate gasoline cut MCN; and c) fractionating, in a splitter, the at least partially desulphurized intermediate gasoline cut MCN which has not undergone catalytic treatment subsequent to step b), in a manner such as to recover an intermediate gasoline with low sulphur and mercaptans contents from the column head and a cut of hydrocarbons containing sulphur-containing compounds including mercaptans from the column bottom.
Abstract:
The invention of the current application is a process for eliminating arsenic from a hydrocarbon feed which is at least partially liquid, including steps a and b.Step a includes bringing the hydrocarbon feed and hydrogen into contact with a first capture mass including a support and at least one metal M1 from group VIB and at least two metals M2 and M3 from group VIII.Step b includes bringing the hydrocarbon feed and hydrogen into contact with a second capture mass in the sulphide form including a support and nickel, the quantity of nickel being at least 5% by weight of NiO with respect to the total weight of the second capture mass.Step a) is either carried out before step b) or carried out simultaneously with step b).
Abstract:
The present application relates to a process for the selective hydrogenation of a gasoline which contains polyunsaturated compounds and sulphurous light compounds, the process allowing conjointly the hydrogenation of polyunsaturated compounds into mono-unsaturated compounds, increasing weight of the sulphurous light compounds by reaction with the unsaturated compounds, and maximization of the isomerization of the monounsaturated compounds comprising an external C═C double bond into their internal C═C double bond isomer, said process implementing a catalyst containing at least one group VIb metal and at least one group VIII metal deposited on a porous support.
Abstract:
This invention describes a process for separation of xylenes for the purpose of the production of high-purity metaxylene, a simulated countercurrent process using at least one adsorber with a limited cumulative total level (Hcu) of adsorbent at a surface velocity (Vsl) that is less than 2 cm/s.
Abstract:
The present invention describes a novel configuration for simulated counter-current para-xylene production units, constituted by two adsorbers, characterized in that the volume occupied by the solid adsorbent is reduced by at least 8% compared with the volume of solid adsorbent contained in the adsorbers of a prior art unit. This novel configuration can be used to minimize the quantity of solid adsorbent necessary to produce a given quantity of para-xylene.
Abstract:
A process for the treatment of a gasoline comprising diolefins, olefins and sulphur-containing compounds including mercaptans: a) demercaptanization by addition of at least a portion of the mercaptans onto the olefins by bringing the gasoline into contact with at least one first catalyst; b) treatment of the gasoline obtained from a) with hydrogen in a distillation column comprising at least one reaction zone including at least one second catalyst. The operating conditions and the second catalyst of b) are selected such that in the distillation column, separation of the gasoline obtained from a) into a light gasoline fraction and a heavy gasoline fraction is carried out simultaneously with a reaction for thioetherification and selective hydrogenation of the diolefins of a gasoline fraction obtained from a) by contact with the second catalyst.
Abstract:
The invention describes a mass for scavenging mercaptans which is particularly suitable for the treatment of olefinic gasoline cuts containing sulfur such as gasolines resulting from catalytic cracking. The scavenging mass comprises an active phase based on group VIII, IB or IIB metal particles which is prepared by a step of bringing a porous support into contact with a metal salt of said group VIII, IB or IIB metal and a step heating the resulting mixture to a temperature above the melting point of said metal salt. The invention also relates to a process for using said scavenging mass for the adsorption of mercaptans.