Abstract: The present invention describes a process for obtaining para-xylene from a feedstock containing xylenes, ethylbenzene and C9+ hydrocarbons, said process comprising a single stage A of separation in a simulated moving bed carried out with a zeolite as adsorbent and a desorbent and making it possible to obtain at least three fractions, a fraction A1 comprising a mixture of para-xylene and of desorbent and two fractions A21, A22 comprising ethylbenzene (EB), ortho-xylene (OX) and meta-xylene (MX) and desorbent, said stage is carried out at a temperature between 20° C. and 250° C., under a pressure between the bubble pressure of the xylenes at the operating temperature and 2.0 MPa, and with a ratio by volume of the desorbent to the feedstock in the unit for separation 2 in a simulated moving bed is between 0.4 and 2.

Abstract: The present invention describes a process for obtaining para-xylene from a feedstock containing xylenes, ethylbenzene and C9+ hydrocarbons, said process comprising a single stage A of separation in a simulated moving bed carried out with a zeolite as adsorbent and a desorbent and making it possible to obtain at least three fractions, a fraction A1 comprising a mixture of para-xylene and of desorbent and two fractions A21, A22 comprising ethylbenzene (EB), ortho-xylene (OX) and meta-xylene (MX) and desorbent, said stage is carried out at a temperature between 20° C. and 250° C., under a pressure between the bubble pressure of the xylenes at the operating temperature and 2.0 MPa, and with a ratio by volume of the desorbent to the feedstock in the unit for separation 2 in a simulated moving bed is between 0.4 and 2.

Abstract: The present invention relates to a process for producing high-purity para-xylene, comprising a single step of separation by adsorption in an SMB, with a subsequent step of separation by distillation in a first three-fraction distillation column producing at least two raffinates and optionally of two isomerization steps, making it possible to improve the overall para-xylene yield of the aromatic loop and to minimize the economic impact.

Abstract: The present invention relates to a process and to a device for the separation of a feedstock comprising benzene, toluene and C8+ compounds, in which: a toluene column (C10) is fed directly with a C7+ cut resulting from the bottom of a stabilization column (C11) positioned downstream of a transalkylation unit (P4); a C7? cut is withdrawn at the top of the toluene column (C10) and a C8+ cut is withdrawn at the bottom; a benzene column (C9) is fed with the C7? cut resulting from the toluene column (C10); an essentially aromatic cut resulting from an aromatics extraction unit (P1) is injected into the toluene column (C10) separately above the feeding of the C7+ cut or into the benzene column (C9).

Abstract: The present invention relates to a process for producing high-purity para-xylene, comprising a single step of separation by adsorption in an SMB, with a subsequent step of separation by distillation in a first three-fraction distillation column producing at least two raffinates and optionally of two isomerization steps, making it possible to improve the overall para-xylene yield of the aromatic loop and to minimize the economic impact.

Abstract: The present invention relates to a process and to a device for the separation of a feedstock comprising benzene, toluene and C8+ compounds, in which: a toluene column (C10) is fed directly with a C7+ cut resulting from the bottom of a stabilization column (C11) positioned downstream of a transalkylation unit (P4); a C7? cut is withdrawn at the top of the toluene column (C10) and a C8+ cut is withdrawn at the bottom; a benzene column (C9) is fed with the C7? cut resulting from the toluene column (C10); an essentially aromatic cut resulting from an aromatics extraction unit (P1) is injected into the toluene column (C10) separately above the feeding of the C7+ cut or into the benzene column (C9).

Abstract: The present invention describes a process for the isomerization of a light naphtha with a view to forming high octane number gasolines, said process using a deisopentanizer and a deisohexanizer which are thermally integrated in a manner such as to reduce the consumption of the high temperature utilities employed in the process.

Abstract: The present invention describes a process for the production of high octane number gasoline by isomerization of a light naphtha cut, comprising two separation steps located downstream of the reaction step which can be used to improve the energy efficiency of said process.

Abstract: In a process for producing para-xylene, at least one feed comprising C6+ aromatic hydrocarbons is supplied to a dividing wall distillation column to separate the feed into a C7? aromatic hydrocarbon-containing stream, a C8 aromatic hydrocarbon-containing stream and a C9+ aromatic hydrocarbon-containing stream. At least part of the C8 aromatic hydrocarbon-containing stream is then supplied to a para-xylene recovery unit to recover para-xylene from the C8 aromatic hydrocarbon-containing stream and produce a para-xylene depleted stream. The para-xylene depleted stream is contacted with a xylene isomerization catalyst in a xylene isomerization zone under conditions effective to isomerize xylenes in the para-xylene depleted stream and produce an isomerized stream, which is then at least partially recycled to the para-xylene recovery unit.

Abstract: A method for recovering heat available at low temperature in a process and its use in order to reduce the energy consumption of the said process, and application of this method to an aromatics complex in which the low-temperature heat is recovered at the head of distillation columns in the form of low-pressure steam and is reused to reboil other distillation columns in which the operating pressure has possibly been lowered.

Abstract: In a process for producing para-xylene, at least one feed comprising C6+ aromatic hydrocarbons is supplied to a dividing wall distillation column to separate the feed into a C7? aromatic hydrocarbon-containing stream, a C8 aromatic hydrocarbon-containing stream and a C9+ aromatic hydrocarbon-containing stream. At least part of the C8 aromatic hydrocarbon-containing stream is then supplied to a para-xylene recovery unit to recover para-xylene from the C8 aromatic hydrocarbon-containing stream and produce a para-xylene depleted stream. The para-xylene depleted stream is contacted with a xylene isomerization catalyst in a xylene isomerization zone under conditions effective to isomerize xylenes in the para-xylene depleted stream and produce an isomerized stream, which is then at least partially recycled to the para-xylene recovery unit.

Abstract: A process for the isomerization of a feed of hydrocarbon compounds containing C5 and/or C hydrocarbon compounds, comprising: a) supplying an isomerization unit with at least one liquid fraction of the feed of hydrocarbon compounds and isomerizing the feed in the presence of a chlorinated catalyst; b) supplying a stabilization unit containing at least one stabilization column with the effluent obtained from the isomerization unit and separating the effluent; c) providing an absorption unit having one absorption column; d) extracting a liquid flow enriched in chlorinated compounds from the absorption unit which is recycled to the isomerization unit; and e) extracting the liquid flow containing at least one isomerate from the stabilization unit.

Abstract: The invention relates to a process for oligomerising light olefins in which the effluent from the oligomerisation section is passed to a prefractionator that leads to at least one head fraction containing a mixture of liquefied petroleum gas and light gasoline and a bottom fraction containing a mixture of heavy gasoline and middle distillate, the said head fraction being passed to a debutaniser that leads to at least one liquefied petroleum gas cut and a light gasoline cut, the said bottom fraction and at least part of the said light gasoline cut being passed to a separator enabling at least a gaseous fraction, a gasoline fraction and a gasoil fraction to be obtained.

Abstract: The present invention describes a process for the isomerization of a light naphtha with a view to forming high octane number gasolines, said process using a deisopentanizer and a deisohexanizer which are thermally integrated in a manner such as to reduce the consumption of the high temperature utilities employed in the process.

Abstract: The present invention describes a process for the production of high octane number gasoline by isomerization of a light naphtha cut, comprising two separation steps located downstream of the reaction step which can be used to improve the energy efficiency of said process.

Abstract: A process for the isomerization of a feed of hydrocarbon compounds containing C5 and/or C6 hydrocarbon compounds, in which process: a) an isomerization unit (1) is supplied with at least one liquid fraction of the feed of hydrocarbon compounds and the isomerization is carried out in the presence of a chlorinated catalyst; b) a stabilization unit (20) containing at least one stabilization column (2) is supplied with the effluent obtained from the isomerization unit (1) and a separation is carried out in the stabilization unit (20); c) an absorption unit (7) contains at least one absorption column (3); d) a liquid flow enriched in chlorinated compounds is extracted from the absorption unit (7) and returned to the isomerization unit (1); e) the liquid flow containing at least one isomerate of the feed of hydrocarbon compounds is extracted from the stabilization unit (20).

Abstract: The present invention relates to a method for recovering heat available at low temperature in a process and its use in order to reduce the energy consumption of the said process. Application of the method to an aromatics complex in which the low-temperature heat is recovered at the head of distillation columns in the form of low-pressure steam and is reused to reboil other distillation columns in which the operating pressure has possibly been lowered.

Abstract: In order to recover hydrogen from a hydrogen-rich gaseous effluent, a procedure is used that comprises: in a stage (a), bringing a hydrocarbon-rich gaseous effluent into contact with the upstream face of a hydrogen-selective membrane at a pressure P1; in a stage (b), bringing a flow containing one or more unsaturated compound(s) into contact with the downstream face of a membrane at a pressure P2, which is smaller than P1, in the presence of a catalyst, to hydrogenate at least a portion of the unsaturated compound(s) using at least a portion of the hydrogen that passes by permeation through the upstream face to the downstream face of the selective membrane; and in a stage (c), transporting a flow containing the hydrogenated compound(s) into stage (b).

Abstract: A process is described for preparing a supported zeolite membrane constituted by a composite continuous zeolite/support layer of controlled thickness, wherein the zeolitic phase is principally localized in the pores of a porous support and optionally on the external surface thereof, the process comprising at least the formation of a precursor gel of the zeolite, bringing the gel into contact with the support and crystallizing the zeolite. The zeolite is crystallized by carrying out a thermal program comprising at least three steps in succession: a first constant temperature stage carried out at a temperature in the range 50° C. to 300° C., cooling to a temperature of strictly less than 50° C. followed by a second constant temperature stage carried out at a temperature range of 50° C. to 300° C. The prepared membrane is used in particular in processes for separating gas or separating liquids.

Abstract: A process is described for preparing a supported zeolite membrane constituted by a composite continuous zeolite/support layer of controlled thickness, wherein the zeolitic phase is principally localized in the pores of a porous support and optionally on the external surface thereof, the process comprising at least the formation of a precursor gel of said zeolite, bringing said gel into contact with said support and crystallizing the zeolite. The zeolite is crystallized by carrying out a thermal program comprising at least three steps in succession: a first constant temperature stage carried out at a temperature in the range 50° C. to 300° C., cooling to a temperature of strictly less than 50° C. followed by a second constant temperature stage carried out at a temperature radical 50° C. to 300° C. The prepared membrane is used in particular in processes for separating gas or separating liquids.