摘要:
The invention relates to a process for preparation of a cationic zeolite that is at least partially exchanged with one or more monovalent and/or multivalent cations. The process comprises at least the stages for separate activation of a zeolite that is to be exchanged and an anhydrous salt under a dry, inert gaseous stream, dissolution of the anhydrous salt in an anhydrous organic solvent, ion exchange under dry inert atmosphere, filtering and washing with an anhydrous organic solvent, and calcination in the presence of oxygen and under a dry gaseous stream. The invention also relates to the use of prepared zeolites for the separation or the purification of hydrocarbon feedstocks.
摘要:
The invention relates to a process for neutralization of a cationic zeolite that is at least partially exchanged with one or more monovalent and/or multivalent cations. The neutralization process comprises at least the stages for dissolution of a basic salt in an anhydrous organic solvent, degassing this solution by bubbling a dry inert gas, suspending the zeolite in this solution under dry inert gas, filtering and washing the solid by an anhydrous organic solvent, and calcination in the presence of oxygen and under a dry gaseous stream. The invention also relates to the use of neutralized zeolites for the separation or the purification of hydrocarbon feedstocks.
摘要:
The present invention relates to agglomerated zeolitic adsorbents containing zeolite X and an inert binder, the inert binder containing at least 80% by weight of clay which has undergone zeolitization by the action of an alkaline solution, the zeolite X having with an Si/Al ratio such that 1.15
摘要:
The invention relates to a process for converting a hydrocarbon charge of linear and branched olefins, comprises the following stages: a) a stage of membrane separation of the hydrocarbon charge under conditions making it possible to produce a cut β containing the majority of the linear olefins present in said charge, and a cut γ containing the majority of the branched olefins, b) a stage of treatment of the linear olefins contained in the effluents originating from the membrane separation stage (cut β) under moderate oligomerization conditions, c) a stage of distillation separation of the effluents originating from the oligomerization stage into at least two cuts, d) a stage of hydrogenation of the cut η under conditions for obtaining a gas oil with a high cetane number.
摘要:
The invention relates to a process for conversion of a gasoline-range hydrocarbon feed into a gasoline fraction with a higher octane rating than that of the feedstream, and a gasoil fraction with a cetane number higher than 45, including the following steps: a) a membrane separation step (B) applied to the hydrocarbon feed under conditions enabling selective separation of the majority of the linear olefins present in said feed and constituting the β fraction, the fraction containing the majority of the branched olefins, termed the γ fraction, constituting a gasoline with a high octane rating, greater than that of the feed, b) an oligomerisation step (C) applied to the linear olefins (β fraction) contained in the effluent stream from the membrane separation step (B) under moderate oligomerisation conditions, c) a distillation separation step (D) applied to the effluent stream arising from the oligomerisation step in at least two fractions, d) a hydrogenation step (E) applied to one of the fractions obtained at step c).
摘要:
The present invention relates to agglomerated zeolitic adsorbents containing zeolite X and an inert binder, the inert binder containing at least 80% by weight of clay which has undergone zeolitization by the action of an alkaline solution, the zeolite X having with an Si/Al ratio such that 1.15
摘要:
A process for separating para-xylene from a C.sub.8 feed in a simulated moving bed comprises a step for adsorption on a zeolite and desorption using a desorbent delivering an extract and a raffinate, and an extract crystallization step. A stream of water is introduced into the feed, into the desorbent and/or into the stream for recycling one flux in the column, such that the weighted average of the amounts of water measured in the extract and in the raffinate is in the range 1 to 200 ppm. The ratio S/F of the desorbent flow rate to that of the feed during the adsorption and desorption step is in the range 0.6 to 2.5.
摘要:
A process for the production of a composite membrane constituted by a continuous zeolite layer which is principally located on the surface of a glass support is described. The process comprises, in succession, at least one step in which partial hydrolysis of the silica of the internal and external surfaces of the porous support is carried out, and a zeolite crystallization step. The supported zeolite membranes obtained are advantageously used in continuous separation processes.
摘要:
Paraxylene and ethylbenzene are produced from an aromatic hydrocarbon feedstock by using adsorption zones in a simulated fluid bed. The feedstock is first passed into a first adsorption zone to produce a first paraxylene-rich fraction and a second ethylbenzene-rich fraction. The second fraction is then passed into a second adsorption zone to produce a third fraction containing essentially pure ethylbenzene and a fourth fraction containing a majority of orthoxylene and metaxylene. The fourth stream is then passed into an isomerization zone to produce an isomerate which is then recycled back to the first adsorption zone.
摘要:
A process for the production of a controlled supported zeolite membrane comprises: (a) forming a gel which is principally localised at the surface of a porous support by bringing it into contact, in succession, with two immiscible liquids which contain the agents necessary for formation of said gel, then (b) crystallising the zeolite from said gel and finally (c) eliminating the residual agents. The supported zeolite membranes obtained are advantageously used in continuous gas separation processes.