Ifp Energies Nouvelles

Institut Francais Du Pe'trole

Luc Wolff

Philibert Leflaive

Damien Leinekugel Le Cocq

Gerard Paul Hotier

Alain Methivier

Gérard Hotier

Elsa Jolimaitre

G&eacute;rard Hotier

Gerhard Pirngruber

Nicolas Couenne

Alirio Rodrigues

Nabil Lamia

Carlos Grande

Damien Leinekugel Le Coq

A process for separating propylene mixed with propane by adsorption in a simulated moving bed is described. The process operates in the gaseous phase or in the liquid phase, and it uses a 13X faujasite-type zeolite as adsorbent solid and butene-1 or isobutane or any mixture of these 2 components as desorbent.

Process for separating propylene mixed with propane by adsorption in a simulated moving bed

The present invention describes a novel configuration for simulated moving bed separation processes characterized by using two adsorbers each containing 12 beds, these two adsorbers functioning in parallel. This novel configuration can be used to optimize para-xylene production.

Process and apparatus for simulated counter-current chromatographic separation using two adsorbers in parallel for optimized para-xylene production

A process for the production of para-xylene by simulated counter-current adsorption with high flexibility with respect to a reference run (100%) uses 2 adsorbers each with 12 beds, said adsorbers being able to be connected in accordance with 3 different modes; the flexibility obtained is 50% to 150%.

Highly flexible process and apparatus for the simulated counter-current production of para-xylene

The present invention relates to a method of producing hydrogen of very high purity from a feed predominantly containing said hydrogen and a minor part of impurities mainly consisting of carbon dioxide, carbon monoxide, methane and heavier hydrocarbons. The purification method by hydrogen adsorption using a desorption stage at a lower pressure than the pressure of the feed, such as a PSA method for example, allows to produce the desorption stream and notably to recover the carbon dioxide under pressure and high-purity hydrogen, with a high yield. These performances are obtained by combining the successive stages of the method according to the invention with the use of a new family of adsorbent whose dynamic capacity at a high desorption pressure is greater than that of conventional adsorbents.

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The invention concerns a process for producing high purity meta-xylene, comprising a step for separation by simulated moving bed adsorption starting from an aromatic C8 feed delivering a fraction which is rich in meta-xylene and a fraction which is depleted in meta-xylene, and a step for crystallization of the meta-xylene rich fraction. The purity of the meta-xylene produced is at least 99.5%.

Process for producing high purity meta-xylene, comprising simulated moving bed adsorption and crystallization

A process for producing para-xylene from a hydrocarbon feed is described in which an adsorption column operating as a simulated moving bed with at least five zones delivers an extract, a 2-raffinate and an intermediate raffinate. The extract is distilled and the distillate is optionally re-crystallized to recover para-xylene with a purity of at least 99.7%. The 2-raffinate is distilled then isomerized in a reactor preferably operating in the liquid phase and at a low temperature. The intermediate raffinate with an enriched ethylbenzene content is distilled then isomerized in the vapour phase.

Method for producing paraxylene comprising an adsortion step and two isomerization steps

Process for separation of metaxylene, with at least 99% by weight of purity of an aromatic feedstock F, in a single adsorption stage in a simulated moving bed in an SMB device that comprises 12, 13 or 15 adsorbent beds with different numbers of beds being employed in zone 1 between the supply of the desorbent D and the draw-off of the extract E; zone 2 between the draw-off of the extract E and the supply of the feedstock F; zone 3 between the supply of the feedstock and the draw-off of the raffinate R; and zone 4 between the draw-off of the raffinate R and the supply of the desorbent D whereby the process is carried out according to a configuration of zones (a, b, c, d), whereby a, b, c, and d represent the number of adsorbent beds that operate respectively in zones 1, 2, 3, 4 in which there is used:

Process and device for improved separation of metaxylene in a simulated moving bed

The invention relates to an original experimental device for the study and the validation of processes in a reactive simulated moving bed, as well as the method that makes possible the exploitation of the results obtained from said device. This device consists of one or two columns and a number of storage tanks.

Experimental device for the study and the extrapolation of processes in a reactive simulated moving bed

A process for co-producing para-xylene and styrene from a feed () of hydrocarbons containing xylenes and ethylbenzene is described, the process comprising the following succession of steps:

Process for co-producing para-xylene and styrene

Method of optimizing the operation of a unit intended for separation of the components of a feed (xylenes) by simulated countercurrent in hybrid operating mode. The method allows to minimize the solvent ratio and to maximize the capacity of the separation unit while keeping product specifications such as purity and yield constant. It has been verified that these two objectives cannot be reached simultaneously and it is recommended to operate with a minimum solvent ratio while guaranteeing a high capacity compatible with stable operation of the separation unit. These optimization objectives are reached while keeping good stability around the optimum point thus defined, by using a known operation control process such as the one described in patent EP-875,268 for example.

Method of optimizing the operation of a xylene separation unit using simulated countercurrent

A process for co-production of paraxylene, metaxylene and/or orthoxylene from a hydrocarbon feedstock () that comprises [1] a separation stage of the feedstock in a simulated moving bed in a chromatographic column () that contains a number of beds of an adsorbent, interconnected in a loop, is described, whereby said column comprises an injection () of the feedstock, a draw-off () of an extract that consists of paraxylene and desorbent, an intermediate fraction () (extract or raffinate) that contains ethylbenzene, and a raffinate () that contains a mixture of metaxylene and orthoxylene that is virtually free of ethylbenzene and paraxylene and [2] a crystallization stage () of the metaxylene and/or orthoxylene fraction. Upstream from the adsorption zone and/or upstream from the crystallization zone, it is possible to distill the entering mixture to produce an orthoxylene-enriched fraction at the bottom and a metaxylene-enriched fraction at the top.

Process for co-production of paraxylene, metaxylene and/or orthoxylene

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.

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Chaponnay, France

Luc Wolff