Institut Francais Du Pe'trole

G&eacute;rard Hotier

Fabio Alario

Julia Magne-Drisch

Elisabeth Merlen

Alain Methivier

Jean-Fran&ccedil;ois Joly

Karine Ragil

Pierre Renard

Philibert Leflaive

Jean-Pierre Durand

Jean-Francois Joly

Hugues Dulot

Olivier Clause

Luc Wolff

Larry Mank

Sophie Jullian

Michel Bailly

Dominique Humeau

Olivier Callebert

Albert Le Corre

Fran&ccedil;oise Montecot

A coproduction process for ortho-xylene and para-xylene starting with a batch of hydrocarbons comprises a simulated counter-current fluidized bed system in a chromatographic column ( ) containing at least five zones, comprising injection ( ) of the batch and injection ( ) of desorption agent and delivering an extract ( ), a refined product ( ), and an intermediate refined product ( ). Refined product ( ), richer in ortho-xylene than the intermediate refined product, is distilled ( ) to extract desorption agent ( ) and is injection, according to the second step of the process, into a simulated counter-current fluidized bed system ( ) delivering an extract ( ) and a refined product ( ) continuously.

Coproduction process for para-xylene and ortho-xylene comprising two separation steps

Device for injecting a diverted fluid into a simulated moving bed separation process

Disclosed is a rotary valve that makes it possible to link several groups of hoses referenced group G , group G , and group G . The valve includes a stator ( ) that is provided with means (E, F, R, S) for circulating fluid or fluids of group , means ( ) for passing at least two fluids F , F that belong to group G , and a rotor ( ) that is equipped with means ( ) for passing fluids of group G and also means ( ) that make possible the linking either of fluids of G with group G or fluids of group G with G .

Rotary valve

The invention relates to a process for the production of at least one isomer of xylenes, preferably paraxylene, as well as benzene, starting from a C8-aromatic fraction, whereby said process comprises a zone for separation of xylenes, a zone for isomerization of aromatic compounds with 8 carbon atoms used in the presence of a catalyst that comprises at least one EUO-structural-type zeolite that is selected from among the EU-1, TPZ-3, ZSM-50 zeolites and at least one metal of group VIII of the periodic table, and finally a transalkylation zone of C7- and C9-aromatic compounds. The invention makes it possible to produce paraxylene and benzene with a high yield, starting from a C8-aromatic fraction that comprises a large amount of ethylbenzene with improved performance levels of the isomerization stage and a good conversion of ethylbenzene in the transalkylation stage.

Process for the production of an isomer of xylenes in three stages: separation, isomerization in the presence of a catalyst based on an EUO zeolite and transalkylation

A process for the production of at least one xylene isomer, paraxylene, metaxylene or orthoxylene from an aromatic feedstock that has 7 to 10 carbon atoms per molecule. The process comprises a stage for transalkylation of C7- and C9-aromatic compounds, a stage for separation of xylenes and a stage for isomerization of xylenes. The isomerization catalyst used in the process comprises at least one EUO zeolite composition whose crystals are grouped in aggregates that have a grain size with a value of Dv,90 less than or equal to 500 microns and at least one element of group VIII.

Production of a xylene isomer in three stages: separation, isomerization with a catalyst with an EUO zeolite base and transalkylation with recycling of C10-aromatic compounds

A simultaneous process for simulated moving-bed dismutation and separation of a toluene feedstock into benzene and xylenes in the presence of a hydrogen-rich desorbent in at least one adsorber-reactor ( ) that contains beds of a solid and comprises at least three zones ( ) is described. Vapor-phase or supercritical feedstock ( ) is introduced at the inlet of a reaction and adsorption zone ( ) (zone III), and a raffinate ( ) that is high in benzene and desorbent is recovered at the outlet. Desorbent ( ) is introduced at the inlet of a desorption zone ( ) (zone I), and an effluent from which is drawn off a portion ( ) in the form of an extract that is high in xylenes and desorbent is recovered at the outlet. The other portion of the effluent of zone I is introduced at the inlet of a reaction and desorption zone ( ) (zone II), and an effluent is recovered at the outlet that is sent back to the inlet of reaction and adsorption zone III. Each of the zones comprises at least one bed that contains an adsorbent that is adapted to separate benzene, toluene and xylenes, and a catalyst that is adapted to dismutate toluene into benzene and xylenes, whereby the adsorbent and the catalyst are in solid form.

Simultaneous process for simulated moving-bed dismutation and separation of toluene into benzene and xylenes

A process for the production of at least one isomer of xylenes comprising a simulated moving-bed adsorption ( ) of a C8-aromatic feedstock ( ) that delivers a paraxylene-rich fraction ( ) that is optionally purified after a distillation ( ) by at least one high-temperature crystallization ( ) and a fraction ( ) that is low in paraxylene is described. Fraction ( ) is distilled and then isomerized ( ) in the presence of an EUO-structural-type catalyst. The lightest hydrocarbons are removed from the isomerization effluent in a first distillation ( ) then naphthenes in a second distillation ( ), and distilled isomerization effluent ( ) that results therefrom is recycled at least in part in adsorption ( ). A mother liquor ( ) that results from the crystallization stage is recycled at least in part in adsorption ( ).

Process for the production of at least one isomer of xylenes that comprise an adsorption stage and an isomerization stage with an euo-structural-type catalyst

A process for co-production of paraxylene and ethylbenzene comprises: (A) an adsorption stage of a feedstock of xylenes and ethylbenzene in a simulated moving bed that produces an extract of pure paraxylene and an ethylbenzene-rich raffinate; (B) an adsorption stage in a simulated moving bed, of raffinate from which desorbent has been removed that supplies an essentially pure ethylbenzene extract and an orthoxylene and metaxylene raffinate that contains desorbent; (C) a recover stage for the desorbent; (D) an isomerization stage for the orthoxylene and metaxylene raffinate in the presence of a catalyst that comprises an EUO-type zeolite; and (E) a stage for recycling the isomerate that is produced with adsorption.

Process for co-production and separation of ethylbenzene and paraxylene

For co-production of metaxylene and paraxylene from a feedstock (line- ) of hydrocarbons, there is employed a simulated moving bed chromatographic column having at least five zones and which delivers an extract, a raffinate and an intermediate raffinate. The feedstock has an ethylbenzene content of less than 5% by weight, and the chromatographic column comprises at least twenty-five beds, of which at least five beds are in zone B. The raffinate is distilled ( ) to recover the metaxylene at a purity of at least 99% and orthoxylene. The extract is distilled ( ) to recover the paraxylene at a purity of at least 99.6%. The recovered isomers can be synthesized into isophthalic acid and terephthalic acid.

Process for co-production of metaxylene and paraxylene

The invention provides a high octane number gasoline pool comprises at least 2% of di-branched paraffins containing 7 carbon atoms, and a process for producing this gasoline pool by hydro-isomerizing a feed constituted by a C5 to C8 cut which comprises at least one hydro-isomerization section and at least one separation section, in which the hydro-isomerization section and at least one separation section, in which the hydro-isomerization section comprises at least one reactor. The separation section comprises at least one unit and produces at least two streams: a first stream which is rich in di- and tri-branched paraffins, and possibly in naphthenes and aromatic compounds which is sent to the gasoline pool; and in a first version of the process, a second stream is produced which is rich in straight-chain and mono-branched paraffins which is recycled to the inlet of the hydro-isomerization section, while in a second version of the process, a second flux is produced which is rich in straight-chain paraffins which is recycled to the inlet of a first hydro-isomerization section and a third stream is produced which is rich in mono-branched paraffins which is recycled to the inlet of a second hydroisomerization section.

High octane number gasolines and their production using a process associating hydro-isomerization and separation

An apparatus and process for regulating the flow rate of at least one fluid or effluent circulating in a simulated moving bed comprises a plurality of beds disposed in a closed loop in at least one chromatographic column (,) and comprising at least one means for recirculating fluid and comprising at least two lines for injecting fluid at a controlled flow rate and at least two lines for withdrawing fluid, one of said withdrawal (extract or raffinate) lines being under flow rate control, the other (,) being under pressure control via at least one control valve (,), and is characterized in that said pressure controlled withdrawal line (,) comprises, in addition to the control valve, comprises at least one restriction means (,) enabling the pressure downstream of at least one of the beds to be reduced. One embodiment of the use of the invention is for separating a xylene isomer.

Apparatus for regulating the flow rate of at least one fluid in simulated moving bed separation units

A system that makes it possible to merge at least four fluids with a column for separating a feedstock, for example, in a simulated moving bed, comprises at least one trunnion-mounted ball valve, whereby this valve comprises at least one means that makes it possible to circulate one or more fluids, this fluid is placed inside the valve to ensure communication between two zones of the column or between at least one of said zones and at least one point that is outside of the column, and several openings (O,, O,) that are placed to ensure the circulation of fluids according to the stages that are necessary to the separation process that is carried out in said column.

Growing community of inventors

Rueil Malmaison, France

Gérard Hotier

Growing community of inventors

Rueil Malmaison, France

G&eacute;rard Hotier

Gérard Hotier