Ifp Energies Nouvelles

Compagnie Generale Des Etablissements Michelin

Institut Francais Du Pe'trole

Arkema France

Damien Leinekugel Le Cocq

Philibert Leflaive

Frederic Augier

Gerard Paul Hotier

Luc Wolff

Catherine Laroche

Alexandre Vonner

Pascal Etienne

Arnaud Baudot

Xavier Decoodt

Marc Jacquin

Fabian Lambert

Heloise Dreux

Pierre-Yves Le Goff

Jeremy Gazarian

Aude Royon-Lebeaud

Vincent Coupard

Ludivine Bouvier

Cécile Lutz

Frederic Bazer-Bachi

Claire Rannoux

Rejane Dastillung

Margarita Dorato

Elsa Jolimaitre

Nuno Pacheco

Romina Digne

David Chiche

Sophie Drozdz

Quitterie Persillon

Gérard Hotier

Sylvie Szendrovics

Gerhard Pirngruber

Frédéric Augier

Philibert LeFlaive

Alirio Rodrigues

Celine Hognon

Romain Richard

Carlos Grande

Lue Wolff

Christine Bounie

Pierre Balz

Nabil Lamia

Aude Royon-lebeaud

Frederic Bazer-bachi

M Gérard Hotier

Céline Hognon

Héloise Dreux

The present invention relates to a process for depolymerizing a polyester feedstock comprising opaque PET, which comprises: a) a conditioning step; b) a step of glycolysis, operated at between 180 and 400° C., a residence time of from 0.1 to 10 h in the presence of diol; c) a diol separation step, at a temperature of between 100 and 250° C., a pressure lower than that of step b) and producing a diol effluent and an effluent rich in monomers; d) a step of separating into a heavy impurities effluent and a prepurified monomers effluent, at a temperature of less than 250° C. and a pressure of less than 0.001 MPa and a residence time of less than 10 min; e) a step of decolourizing the prepurified monomers effluent, by adsorption of a mixture comprising between 20% and 90% by weight of the prepurified monomers effluent and a solvent, at a temperature of between 100 and 200° C., a pressure of between 0.1 and 1.0 MPa and in the presence of at least one adsorbent.

Method for obtaining a purified diester effluent by depolymerising a polyester comprising opaque polyethylene terephthalate

The present invention describes a device for supplying or collecting from a column forming part of an assembly of columns in series, for use in a simulated moving bed separation process. The present device can be used to very substantially reduce the non-selective volumes in each column.

Concept for collection and distribution channels for a simulated moving bed separation process using N-columns in series

Method for the simulated moving bed (SMB) separation of a feedstock (F), in which: at least one zone (1, 2, 3, 4) contains fewer than three beds, if the stream (D, E, F, R) delimiting said zone and situated upstream of said zone is injected or withdrawn at the plate Pvia the bypass line L, then the stream delimiting said zone and situated downstream of said zone is injected/withdrawn at the plate Pvia the bypass line L, and if the stream delimiting said zone and situated downstream of said zone is injected or withdrawn at the plate Pvia the bypass line L, then the stream delimiting said zone and situated upstream of said zone is injected/withdrawn at the plate Pvia the bypass line L.

Simulated moving bed separation method and device with reduced number of beds and bypass fluid flow

Liquid-liquid extraction and distillation of a liquid feedstock of at least ethanol, water, acetaldehyde and at least one hydrocarbon-based impurity with a boiling point of between 20&#xb0; C. and 100&#xb0; C. at atmospheric pressure, or which generates, with at least one of the compounds of the liquid feedstock and/or with the organic extraction solvent and/or with the aqueous back-washing solvent, an azeotrope and a partition coefficient of between 0.1 and 5 at any point in a back-washing (BW) column of the extraction section, by (a) a liquid-liquid extraction step a washing (W) column, a back-washing (BW) column and at least one injection (F) of a cut withdrawn in step b), located in the top half of the back-washing column, (b) distillation of an aldehyde and ethanol separation producing at least one aldehyde-rich effluent, one ethanol-rich effluent and one water-rich effluent.

Method for selectively separating impurities present in a hydro-alcoholic cut by recycling through a liquid-liquid extraction column

Method for the simulated moving bed separation of a feedstock (F), in which when a fluid/effluent (feedstock F, desorbent D, extract E, raffinate R) is injected/withdrawn into/from a chosen plate (P) using an external bypass line (L, L) connected to said chosen plate (P), the flow rate within the said external bypass line (L, L) is controlled in such a way that: a major proportion of the fluid/effluent (F, D, E, R) is injected/withdrawn into/from the chosen plate (P); and a minor proportion of the fluid/effluent (F, D, E, R) is injected/withdrawn into/from the adjacent plate (P, P) connected to the said external bypass line (L, L).

Simulated moving bed separation method and device with bypass fluid flow

The present invention describes a device for distributing incoming fluid or for collecting fluid being discharged from a column forming part of an assembly of N columns in series intended to be used in a simulated moving bed separation process. The present device can be used to very substantially reduce the non-selective volumes at each column, while at the same time providing the flow with good synchronicity.

Peripheral distribution or collection system for a simulated moving bed separation method using N columns in series

The invention relates to a process for purifying an aqueous solution comprising ethanol, acetaldehyde and diethylacetal comprising: a step A) of countercurrent liquid-liquid extraction comprising an extraction section supplied at the top by said aqueous solution as a mixture with at least one fraction of the water/ethanol/acetaldehyde raffinate resulting from the back extraction step B), and at the bottom by an extraction solvent, and producing an extract at the top and a purified feedstock at the bottom; &#x2014;a step B) of countercurrent liquid-liquid back extraction comprising a back extraction section supplied at the top by an acidic aqueous solution, the pH of which is between 0.5 and 5, and at the bottom by the extract resulting from step A), and producing an extract at the top and a water/ethanol/acetaldehyde raffinate at the bottom.

Process for purifying an aqueous solution comprising diethylacetal

The invention relates to a conversion method that is fed with a diol feedstock that comprises at least 90% by weight of diol and a carboxylic acid feedstock that comprises at least 80% by weight of carboxylic acid. The method comprising at least:

Method for esterification of a diol using a reactive distillation

Process for separating xylenes starting from a feed comprising cuts of isomers of aromatic hydrocarbons containing 8 carbon atoms, in a simulated moving bed, by selective adsorption of a xylene isomer in the presence of a desorbent, by means of particles of agglomerated zeolitic adsorbent based on zeolite crystals with a number-average diameter less than or equal to 1.2 &#x3bc;m, wherein the number-average diameter of said particles of adsorbent is between 150 &#x3bc;m and 500 &#x3bc;m and the mechanical strength measured by the Shell method series SMS1471-74 adapted for agglomerates with a size below 500 &#x3bc;m is greater than or equal to 2 MPa.

Method for separating xylenes in a simulated moving bed by means of a zeolitic adsorbent solid having a particle size of between 150 and 500 microns

The present invention describes a device for supplying the catalytic zone of a reactive distillation column using a liquid stream as the reaction stream, the flow of liquid in the reactive zone being of the upflow type and gas not encountering the liquid in the reactive zone.

Device for distributing gas and liquid in catalytic distillation columns

The present invention describes a liquid-liquid extraction column with perforated plates and overflows, the plates also being equipped with an additional friction element which makes it possible to increase the thickness of the layer of coalesced matter and to guarantee a counter-current flow of the continuous and dispersed phases.

Liquid-liquid extraction column using plates equipped with a pressure drop generator element

The present invention describes a process for the simulated moving bed separation of xylenes which can be used for the treatment of paraxylene-rich feeds (more than 25% by weight of paraxylene), in which the operating conditions are optimized by means of a specific relationship between the cycle time and the desorbant flow rate.

Simulated moving bed xylenes separation process, and optimized operating conditions for units treating paraxylene-rich feeds

The present invention describes a process for the simulated moving bed separation of xylenes, in which the operating conditions are optimized by means of a specific relationship between the cycle time and the flow rate of the desorbant.

Process for the simulated moving bed separation of xylenes, and optimized operating conditions

The present invention describes a process for the production of high-purity paraxylene from a xylenes cut capable of containing ethylbenzene and C9 compounds, said process using two simulated moving bed separation units operating in series and two isomerization units.

Process for the production of high-purity paraxylene from a xylenes cut, using two simulated moving bed separation units operating in series and two isomerization units

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.

Method for the production of paraxylene, comprising two simulated moving bed separation and two isomerization units, one being in the gas phase

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Lyons, France

Damien Leinekugel Le Cocq