Abstract:
A process for the treatment of a gasoline containing sulphur-containing compounds, olefins and diolefins: a) fractionating the gasoline into at least: a light gasoline cut LCN; a primary intermediate gasoline cut, MCN; and a primary heavy gasoline cut HHCN; b) desulphurizing the primary intermediate gasoline cut MCN alone producing an at least partially desulphurized primary intermediate gasoline cut MCN; c) desulphurizing the primary heavy gasoline cut HHCN alone producing an at least partially desulphurized primary heavy gasoline cut HHCN; d) sending, as a mixture, the partially desulphurized primary intermediate gasoline cut MCN and the partially desulphurized primary heavy gasoline cut HHCN to a separation column separating a gaseous stream containing hydrogen and H2S, a secondary intermediate gasoline cut MCN with low sulphur and mercaptans contents and a secondary heavy gasoline cut HHCN containing sulphur-containing compounds including recombinant mercaptans; e) desulphurizing the secondary heavy gasoline cut HHCN obtained from step d).
Abstract:
Provided is a zeolite-based adsorbent in the form of agglomerates, where the adsorbent having a tortuosity factor, calculated from the pore distribution determined by mercury intrusion porosimetry, of greater than 1 and less than 3. The adsorbent also has a porosity as determined by mercury intrusion porosimetry of between 25% and 35%. The adsorbent is useful in the field of separations in particular in a process for separating para-xylene from aromatic hydrocarbon isomer fractions containing 8 carbon atoms.
Abstract:
The present invention describes a process for the production of high-purity paraxylene from a xylenes cut containing xylenes and ethylbenzene, a process using two simulated moving bed separation units and two isomerization units.
Abstract:
The present invention describes a process for the separation of xylenes in simulated counter-current utilising at least one adsorber with a limited cumulated total height (Hcu) of adsorbent and a superficial velocity (Vsl) of less than 2 cm/s.
Abstract:
The invention relates to a process for the hydrodesulfurization of a sulfur-containing olefinic gasoline cut in which said gasoline cut, hydrogen and a regenerated catalyst are brought into contact, said process being carried out at a temperature of between 200° C. and 400° C., a total pressure of between 1 and 3 MPa, an hourly space velocity, defined as being the flow rate by volume of feedstock relative to the volume of catalyst, of between 1 and 10 h−1; and a hydrogen/gasoline feedstock ratio by volume of between 100 and 1200 SI/I, said regenerated catalyst resulting from an at least partially spent catalyst resulting from a process for the hydrodesulfurization of a sulfur-containing olefinic gasoline cut and comprises at least one metal from group VIII, at least one metal from group VIb and an oxide support.
Abstract:
The invention relates to a process for the hydrodesulfurization of a sulfur-containing olefinic gasoline cut in which said gasoline cut, hydrogen and a rejuvenated catalyst are brought into contact, said hydrodesulfurization process being carried out at a temperature of between 200° C. and 400° C., a total pressure of between 1 and 3 MPa, an hourly space velocity, defined as being the flow rate by volume of feedstock relative to the volume of catalyst, of between 1 and 10 h−1 and a hydrogen/gasoline feedstock ratio by volume of between 100 and 1200 Sl/l, said rejuvenated catalyst resulting from a hydrotreating process and comprises at least one metal from group VIII, at least one metal from group VIb, an oxide support and at least one organic compound containing oxygen and/or nitrogen and/or sulfur.
Abstract:
The present invention relates to a hydrotreating catalyst comprising at least one group VIB metal, at least one group VIII metal and an alumina support having a gamma alumina content greater than 50% by weight and less than 100% by weight with respect to the weight of the support, said support having a specific surface area comprised between 25 and 150 m2/g.
Abstract:
A process for the desulphurization of a gasoline cut containing sulphur-containing compounds, olefins and diolefins, involving (a) fractionating the gasoline in order to recover a light gasoline cut LCN and a first heavy gasoline cut HCN; (b) desulphurization of the first heavy gasoline cut HCN; (c) partially condensing desulphurization effluent obtained from b) in a manner such as to produce a gaseous phase of hydrogen and H2S and a liquid hydrocarbon phase HCN of dissolved H2S; (d) separating the liquid hydrocarbon phase HCN into an intermediate gasoline cut MCN and a second heavy gasoline cut HHCN; (e) carrying out a second desulphurization of the second heavy gasoline cut HHCN.
Abstract:
The present invention relates to zeolitic adsorbents based on agglomerated crystals of FAU zeolite containing barium and/or potassium, with large external surface area, combining optimum properties in terms of selectivity and mechanical strength. These adsorbents find applications in the separation of cuts of C8-aromatic isomers and notably of xylenes, in the separation of isomers of substituted toluene such as nitrotoluene, diethyltoluene, toluenediamine, in the separation of cresols, and in the separation of polyhydric alcohols such as sugars.
Abstract:
This invention relates to a process for treatment of a gasoline comprising diolefins, olefins, and sulfur-containing compounds including mercaptans, in which: Gasoline is injected into a distillation column comprising at least one reaction zone to produce a desulfurized light gasoline; with the process also comprising the following stages: An intermediate gasoline fraction is drawn off at a level located above the reaction zone; A heavy gasoline comprising the majority of the sulfur-containing compounds is drawn off at the bottom of the column; In a demercaptization reactor, said intermediate gasoline fraction is brought into contact with a second catalyst to produce an effluent that contains sulfides; The effluent that is obtained from the demercaptization reactor is recycled in the distillation column (3).