Institut Francais Du Pe'trole

Axens

Exxonmobil Chemical Patents Inc.

Isabelle Prevost

Jerome Pigourier

Alexandre Rojey

Pierre-Yves Martin

Laurent Watripont

Christian Streicher

Christophe Chau

Thierry Leflour

Thierry Gauthier

Gerard Paul Hotier

Denis Uzio

Michel Molinier

Joseph Y Larue

Chunshe J Cao

Olivier Clause

Xiaobo Zheng

Kevin J Knob

Dennis J Stanley

Karine Ragil

Jacques Rault

Sylvain Miachon

Jérôme Pigourier

Celia Fernandez

Jean-Alain Dalmon

Alain Dunet

Stephane Claudel

Terri S Vander Pol

Arnaud Cotte

Benoit Millot

Jérôme M Pigourier

The present invention describes a process for obtaining para-xylene from a feedstock containing xylenes, ethylbenzene and C9+ hydrocarbons, said process comprising

Method for producing paraxylene using a simulated moving-bed step, and a step of fractionating two fractions in a two-section column

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.

Process for producing para-xylene using a step in a simulated moving bed and a step of fractionation via a three-fraction column

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the bottom of a stabilization column (C11) positioned downstream of a transalkylation unit (P4); a C7&#x2212; cut is withdrawn at the top of the toluene column (C10) and a C8+ cut is withdrawn at the bottom; a benzene column (C9) is fed with the C7&#x2212; cut resulting from the toluene column (C10); an essentially aromatic cut resulting from an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).

Process and device for the inverted separation of aromatics

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.

Naphtha isomerization process comprising two thermally integrated steps

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.

Gasoline production process comprising an isomerization step followed by at least two separation steps

In a process for producing para-xylene, at least one feed comprising Caromatic hydrocarbons is supplied to a dividing wall distillation column to separate the feed into a Caromatic hydrocarbon-containing stream, a Caromatic hydrocarbon-containing stream and a Caromatic hydrocarbon-containing stream. At least part of the Caromatic hydrocarbon-containing stream is then supplied to a para-xylene recovery unit to recover para-xylene from the Caromatic 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.

Aromatics production process

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.

Method for recovering low-temperature heat and application of the method to an aromatics complex

A process for the isomerization of a feed of hydrocarbon compounds containing Cand/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.

Process for the isomerization of C5/C6 hydrocarbon cuts with chlorinated compound recycling

In order to recover hydrogen from a hydrogen-rich gaseous effluent, a procedure is used that comprises:

Process for recovering hydrogen in a gaseous hydrocarbon effluent using a membrane reactor

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&deg; C. to 300&deg; C., cooling to a temperature of strictly less than 50&deg; C. followed by a second constant temperature stage carried out at a temperature range of 50&deg; C. to 300&deg; C. The prepared membrane is used in particular in processes for separating gas or separating liquids.

Process for preparing supported zeolitic membranes by temperature-controlled crystallisation

For producing three effluents which are respectively rich in straight chain paraffins, in mono-branched paraffins, and in di-branched and tri-branched paraffins possibly with naphthenic and/or aromatic compounds, from C5-C8 cuts or intermediate cuts (C5-C7, C6-C8, C7-C8, C6-C7, C7 or C8), comprising paraffic and possibly naphthenic, aromatic and olefinic hydrocarbons, the separation process of the invention uses at least two separation units operating either by adsorption or by permeation. It is of particular application when coupled with a hydro-isomerization process, which selectively recycles straight chain and mono-branched paraffins, necessary with paraffins containing more than 7 carbon atoms.

Process for separating a C5-C8 feed or an intermediate feed into three

To reduce the benzene content of a hydrocarbon mixture that contains benzene and other hydrocarbons, the mixture is fed to a distillation column so as to separate an overhead distillate, a bottom residue, and a sidestream having a benzene content richer than in the distillate and in the residue; the resultant sidestream is sent to at least one permeation zone to permeate the benzene selectively and retain a retentate having a reduced content of benzene; and at least part of the retentate is recycled to at least one level in the distillation column, preferably two levels, one at above and one below the feedpoint to the column. The permeate benzene stream is optionally subjected to extractive distillation in order to increase the purity of the resultant benzene.

Process for reducing the benzene content in a hydrocarbon fraction

A mixture that contains benzene, other aromatic hydrocarbons and paraffinic hydrocarbons and/or naphthenic hydrocarbons that have 5 to 10 carbon atoms undergoes distillation in a first column, producing a distillate and a residue; a phase is drawn off laterally from the first distillation column, preferably at a point on the column where the benzene content is essentially at maximum where the toluene content is low; the phase that is drawn off is sent toward a first permeation stage, which produces a permeate that is enriched with benzene and a retentate; at least a portion of said retentate is recycled toward said first distillation column; the benzene-enriched permeate from stage (3) is sent to a second distillation column, from which the purified benzene comes out at the bottom and a distillate vapor comes out at the top; the distillate vapor is condensed, and the condensed distillate is sent at least in part to a second permeation stage; in said second permeation stage, a permeate that is also enriched in benzene and a retentate are separated; the permeate is recycled to the second distillation column; and the retentate is recycled toward the inlet of the first permeation stage or directly toward the first distillation column.

Growing community of inventors

Rueil Malmaison, France

Isabelle Prevost