Abstract: A composition capable of removing chlorides from a gaseous stream and a process of using same. The compositions have sufficient chloride capacity, offer comparable creation of green oil, and have sufficient structural integrity to be utilized as sorbents in a chloride removal process. Generally, the compositions include a first zinc carbonate, a second zinc carbonate different than the first zinc carbonate and an alumina material. The composition has been cured at a temperature between about 149 to 399° C. The first zinc carbonate may comprise hydrozincite and the second zinc carbonate may comprise smithsonite.

Abstract: A process is described for separating paraxylene from a multicomponent fluid mixture of C8 aromatics. A mixture of C8 aromatics is fed to a simulated moving-bed adsorptive apparatus. The location of the feed to the apparatus is moved at set intervals. The rate of flow of feed to the apparatus is varied during each interval to enhance the separation of paraxylene from the multicomponent mixture.

Abstract: Processes for removal of heavy aromatic compounds in an alkylated aromatic compounds production complex is disclosed. The processes includes separating a first component from a second component comprising introducing a feed stream comprising the second component and less than about 5 wt % of the first component to one or more top trays of a prefractionation column. The feed stream is separated in the prefractionation column to provide a prefractionation column overhead stream comprising at least about 50 wt % of the second component present in the feed stream and a prefractionation column bottoms stream. A first portion of the prefractionation columns bottom stream is vaporized by heat exchange with a low temperature fluid stream having a temperature of about 150-200° C. in a reboiler and passing the vaporized first portion through the prefractionation column.

Abstract: Described herein is a material for reversibly binding to a carotenoid comprising a support coupled to silver ions in an amount to enable reversible binding with carotenoids, and wherein with the exception of silver ions, is substantially free of transition metals. Also described herein is a process for reversibly binding a carotenoid, the process comprising the steps of: providing a support coupled to silver ions in an amount to enable reversible binding with the carotenoid, wherein with the exception of silver, the support is substantially free of transition metals, contacting the support with the carotenoid under binding conditions to bind it thereto and dissociating the carotenoidod from the support under dissociating conditions to release the carotenoid.

Abstract: The invention is directed to a process for the removal of olefin impurities from a feedstream comprising greater than equilibrium amounts of paraxylene by contact of the feedstream with a bed of solid acid catalyst to produce a product comprising reduced olefin impurities (when compared with said feedstream), said process comprising at least one of (i) reduced bed temperature on startup, and (ii) reduced flow rate on startup, wherein, in embodiments, there is a reduction in side reactions such as isomerization and/or transalkylation and/or disproportionation of paraxylene, when compared with conventional startup procedures.

Abstract: Methods and apparatuses for providing process control in dual column processes are provided. In an embodiment, a method for processing a raffinate stream includes forming the raffinate stream in an adsorbent zone. The method monitors the pressure in the adsorbent zone. The raffinate stream is split into a first portion and a second portion. A first flow rate of the first portion is adjusted in response to the pressure in the adsorbent zone, and a second flow rate of the second portion is adjusted in response to the first flow rate. The first portion is fractionated in a first column and the second portion is fractionated in a second column.

Abstract: The invention relates to aggregate zeolitic adsorbents based on faujasite X type zeolite powder having a low silica content and small crystals, exchanged with barium or based on faujasite X type zeolite having a low silica content and small crystals, exchanged with barium and potassium. The invention also relates to the method for preparing said aggregate zeolitic adsorbents, and also their uses for separating sugars, polyhydric alcohols, isomers of substituted toluene, cresols, or for recovering very high purity paraxylene.

Abstract: The invention relates to removal of styrene from hydrocarbon mixtures, and more particularly, removal of styrene from hydrocarbon mixtures containing higher than equilibrium paraxylene concentrations.

Abstract: The present invention relates to agglomerated zeolitic adsorbents based on zeolite X with an Si/Al ratio such that 1.15<Si/AL<1.5, consisting of crystals with a mean diameter of 1.7 mm or less and of an inert binder, at least 90% of the exchangeable cationic sites of the zeolite X being occupied by barium ions. They may be obtained by agglomerating a zeolite X powder having a mean diameter of 1.7 mm or less with a binder, followed by zeolitization of the binder, exchange of the zeolite ions with barium (and potassium) ions and activation of the adsorbents thus exchanged.

Abstract: A process for adsorption separation uses a solid IM-12 type adsorbent to separate a molecular species from any feed.

Abstract: A process for separating para-xylene from a mixture of C8 alkylaromatics comprises contacting the mixture of C8 alkylaromatics with a zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/Al framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).

Abstract: Disclosed is a method for separating aromatic compounds using a simulated moving bed adsorptive chromatography, comprising a sulfolan process that is a non-aromatic compound removing process, a benzene/toluene fractionation process, an aromatic compound fractionation process, a selective toluene disproportionation process, a transalkylation process, a simulated moving bed para-xylene separation process and a xylene isomerization process, wherein the method is characterized by further comprising a simulated moving bed xylene mixture pre-treatment process and an additional xylene isomerization process. The separation method of aromatic compounds according to the present invention can make significant improvement in para-xylene and benzene production in the overall process, as compared to the conventional aromatic compound separation process.

Abstract: Embodiments of the present invention provide, for an adsorption separation system for separating normal paraffins from a hydrocarbon feed stream, a process for switching the adsorption separation from a triple split desorbent system to a dual split desorbent system, and vice versa. Switching occurs by separating and/or introducing a second flush material in the adsorption separation system. This switching can occur during normal operations.

Abstract: A process for separating para-xylene from a mixture of C8 alkylaromatics comprises contacting the mixture of C8 alkylaromatics with a zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/AI framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).

Abstract: A zeolitic binder-converted composition comprising (a) a zeolite X composition having at least a first zeolite X having a mean diameter not greater than 2.7 microns, and a second zeolite X, wherein the second zeolite X is obtained by converting a binder material to the second zeolite X and the binder material is in a range from 5 to 50 wt % of the zeolite X composition; and (b) an unconverted binder material content, after conversion to the second zeolite X is complete, in a range from 0 to 3 wt % of the zeolite X composition. The zeolite X composition has an average Si/Al framework mole ratio in a range from 1.0 to 1.5, and a relative LTA intensity not greater than 1.0, as determined by x-ray diffraction (XRD).

Abstract: Processes and systems for removing contaminants from a paraffin containing feedstock are provided that include: providing a paraffin containing feedstock, passing the paraffin containing feedstock to an inlet of a guard bed that includes an adsorbent material, and contacting the paraffin containing feedstock with the adsorbent material in the guard bed to produce a treated paraffin containing feedstock. The processes and systems can also include removing the treated paraffin containing feedstock from an outlet of the guard bed, and passing the treated paraffin containing feedstock to a paraffin separation zone that separates normal paraffins from the treated paraffin containing feedstock.

Abstract: The present invention relates to agglomerated zeolitic adsorbents based on zeolite X with an Si/Al ratio such that 1.15<Si/AL<1.5, consisting of crystals with a mean diameter of 1.7 mm or less and of an inert binder, at least 90% of the exchangeable cationic sites of the zeolite X being occupied by barium ions. They may be obtained by agglomerating a zeolite X powder having a mean diameter of 1.7 mm or less with a binder, followed by zeolitization of the binder, exchange of the zeolite ions with barium (and potassium) ions and activation of the adsorbents thus exchanged.

Abstract: A process for separating C8 aromatics is disclosed. The process uses at least two adsorbents, and in particular a BaX zeolite and a KY zeolite, for the separation of para-xylene from a mixture of C8 aromatics.

Abstract: It is an object of the present invention to provide a non-conjugated cyclic diene and a non-conjugated cyclic diene composition which enable the production of a polymer based on non-conjugated cyclic diene which makes it possible to produce a (co)polymer at a high degree of polymerization activity, and a method of producing a polymer based on non-conjugated cyclic diene which makes it possible to produce a (co)polymer at a high degree of polymerization activity. A non-conjugated cyclic diene is used which meets at least one of the following requirements: (1) it contains a compound having a seven-membered cyclic triene hydrocarbon structure in a specific amount or less and (2) it contains a conjugated polyene compound having an eight-membered bicyclic hydrocarbon structure in a specific amount.

Abstract: A process for separating mixtures of hydrocarbon isomers on molecular sieves, including providing columns which include molecular sieves and function alternatively as secondary adsorption, primary adsorption, and desorption devices, feeding the mixtures of hydrocarbon isomers to a column functioning as the primary adsorption device for adsorbing isomers with greater selectivity towards the molecular sieves, feeding effluent of the mixtures from the column functioning as the primary adsorption device to a column functioning as the secondary adsorption device for adsorbing remaining isomers with greater selectivity, discharging isomers with a lower selectivity from the column functioning as the secondary adsorption device and a desorbing agent therein, feeding a desorbing agent to the column functioning as the desorption device, discharging isomers with a greater selectivity towards the molecular sieves and the desorbing agent in the column functioning as the desorption device.

Abstract: A process for separating multibranched paraffins comprised in a hydrocarbon feed comprising hydrocarbons containing 5 to 8 carbon atoms per molecule comprises a separation unit functioning by adsorption and contains at least one zeolitic adsorbent with a mixed structure with principal channels with openings defined by a ring containing 10 oxygen atoms and secondary channels with openings defined by a ring of at least 12 oxygen atoms, the secondary channels only being accessible to the feed to be separated via the principal channels. Particular zeolitic adsorbents of the invention are zeolites with structure types EUO, NES and MWW. NU-85 and NU-86 zeolites are also particularly suitable for carrying out the process of the invention.

Abstract: The invention relates to an effective method of separating polycyclic aromatic hydrocarbons by means of a chromatographic separation method. This is achieved by using, according to the invention, calixarene-modified separation phases as stationary phase for chromatography in order to separate polycyclic aromatic hydrocarbons. The calixarene-modified stationary phases are particularly suitable for separating polycyclic aromatic hydrocarbons in liquid chromatography separation methods.

Abstract: A process for separating at least one C8 alkylaromatic hydrocarbon from a mixture containing at least one C8 alkylaromatic hydrocarbon and at least one C9 or C10 alkylaromatic hydrocarbon using dealuminated sodium zeolite Y.

Abstract: Construction and operational costs of simulated moving bed adsorptive separation process units are reduced by recovering desorbent from both the extract and raffinate streams of the process in a single column. Both streams are fractionated to recover desorbent, which is removed at one end of a dividing wall column, while separate extract and raffinate products are removed from the other end of the column.

Abstract: The present invention relates to agglomerated zeolite adsorbents based on faujasite with an Si/Al ratio such that 1≦Si/Al≦1.15, at least 70% exchanged with barium and optionally with potassium, and on a binder, preferably a zeolitizable binder. They are obtained by agglomerating zeolite powder with a binder, followed by exchange of the zeolite ions for barium ions and activation of the adsorbents thus exchanged. These adsorbents are particularly suitable for the adsorption of the para-xylene contained in aromatic C8 hydrocarbon fractions in the liquid phase, in processes of simulated fluid-bed type.

Abstract: A process for separating at least one C8 alkylaromatic hydrocarbon from a mixture containing at least one C8 alkylaromatic hydrocarbon and at least one C9 or C10 alkylaromatic hydrocarbon using sodium zeolite Y, dealuminated sodium zeolite Y or dealuminated zeolite Y ion exchanged with a metal selected from the group consisting of calcium, sodium, strontium, a Group IB element, a Group VIII element and mixtures thereof.

Abstract: Construction and operational costs of recovering the extract or raffinate product of a simulated moving bed adsorptive separation process units are reduced by employing a dividing wall column to perform the separation. The raffinate or extract stream is passed into the column at an intermediate point on the first side of the dividing wall, with the column delivering the adsorptive separation product as a sidedraw from the opposite side of the dividing wall. A stream of co-adsorbed impurity is removed as an overhead stream and desorbent is recovered as a net bottoms stream.

Abstract: The present invention relates to methods for removing VOCs from an aqueous polymer dispersion (e.g., an SBR latex) in which the dispersion is contacted with a stripping medium in the presence of a particulate adsorbent such as activated carbon. This process results in the rapid and economical removal of VOCs from polymer dispersions.

Abstract: Construction and operational costs of simulated moving bed adsorptive separation process units are reduced by recovering desorbent from both the extract and raffinate streams of the process in a single column. Both streams are fractionated in the same column to recover desorbent, which is removed at the bottom of the column. The bottom of the column is divided into a reboiler sump section and a bottoms product-desorbent inventory section, with this reducing the equipment required in the overall process.

Abstract: A process for separating off cycloalkenes having at least two double bonds from a reaction mixture in hydrocarbon solution formed during the metathesis of cycloalkamonoenes or cyclomonoene/cyclopolyene mixtures comprising the steps of treating the reaction mixture with zeolites in the liquid phase, absorbing the olefins having at least two double bonds present in the solution by the zeolite, separating off the laden zeolite, and obtaining the cycloalkadienes and cyclopolyenes by desorption.

Abstract: An adsorption process for the recovery of paraxylene from mixed xylenes using a molecular sieve adsorbent comprising SSZ-25, MCM-22, PSH-3, ERB-1, or ITQ-1. A preferred desorbent for the process is benzene. A hybrid adsorption/crystallization PX purification process is also described using the molecular sieve adsorbent.

Abstract: A process for separating at least one C8 alkylaromatic hydrocarbon from a mixture containing at least one C8 alkylaromatic hydrocarbon and at least one C9 or C10 alkylaromatic hydrocarbon using zeolite Y or zeolite Y ion exchanged with a metal selected from the group consisting of calcium, sodium, strontium, a Group IB element, a Group VIII element and mixtures thereof.

Abstract: Metaxylene is recovered from admixture with other C.sub.8 aromatic hydrocarbons including orthoxylene by liquid phase adsorptive separation using a sodium exchanged Y zeolite as the adsorbent. Performance is improved by maintaining the adsorbent in a narrow range of temperature and hydration. These conditions allow the metaxylene to be recovered in a single raffinate process without costly prefractionation for orthoxylene removal. A novel desorbent, indane, is also disclosed.

Abstract: The cost of separating para-xylene from other xylene isomers and C.sub.9 aromatics by adsorption on zeolitic molecular sieves is reduced by the use of 1,4 diisopropylbenzene as a relatively high boiling desorbent. The desorbent has surprisingly high strength and selectivity characteristics with the preferred desorbent. The preferred adsorbent is an X zeolite containing barium or both barium and potassium ions at exchangeable cationic sites. The para-xylene components are selectively adsorbed onto the adsorbent. The non-adsorbed feed is then removed from the adsorbent and the para-xylene recovered by desorption.

Abstract: Distillate or hydrotreated distillate effluent is separated into an aromatics rich permeate and an aromatics lean retentate by use of a permselective membrane with the aromatic rich permeate being sent to a hydrotreater, thereby increasing the quantity of reduced aromatics content product.

Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio for the solvent to charge flow rates of 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25.degree. to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which is then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.

Abstract: Ethylbenzene is recovered from a mixture of C.sub.8 aromatic hydrocarbons including xylenes by adsorptive separation in a narrow temperature range using a cesium exchanged X zeolite as the adsorbent. A mixture of diethylbenzene and toluene is the preferred desorbent.

Abstract: According to the method of the invention, it is possible to separate and selectively remove alkyltetralins coexisting in a small amount in a LAB mixture which is an intermediate raw material for surfactants for detergents, the method conveniently being carried out in a continuous manner using a solid adsorbent.

Abstract: Metaxylene is recovered from a mixture of C.sub.8 aromatic hydrocarbons including other xylenes by liquid phase adsorptive separation using a sodium or sodium and lithium exchanged Y zeolite as the adsorbent. Performance is improved by maintaining the adsorbent in a narrow range of temperature and hydration. Toluene is the preferred desorbent.

Abstract: A process for separating p-diethylbenzene from a diethylbenzene isomers mixture by selective adsorption of p-diethylbenzene on a silicalite adsorbent is disclosed in the present invention, wherein a compressed high pressure CO.sub.2 or propane is used as a carrier for carrying a fixed amount of the diethylbenzene isomers mixture to the silicalite adsorbent bed for the selective adsorption, a first stage effluent stream containing a rich meta-diethylbenzene (m-DEB) and/or ortho-diethylbenzene (o-DEB), but having substantially no para-diethylbenzene (p-DEB) is eluted from the adsorbent bed; when p-DEB of the mixture starts to appear in the first stage effluent stream, a much higher pressurized CO.sub.2 or propane used as a desorbent is then fed into the adsorbent bed, and a second stage effluent stream conaining a rich p-DEB, but having substantially no other DEB isomers is thereby eluted from the adsorbent bed.

Abstract: The eutectic limit of para-xylene crystallization is overcome by enriching the concentration of para-xylene of the crystallization feed. This is accomplished by passing the crystallization feed stream through a selective adsorption zone to produce a para-xylene-enriched stream and a para-xylene-depleted stream. The para-xylene-depleted stream is passed to an isomerization zone to re-equilibrate the xylene mixture, thereby producing additional para-xylene. The para-xylene-enriched stream is passed to a crystallization zone to produce high purity para-xylene. The result is an increase in the overall para-xylene recovery.

Abstract: This invention provides a method for separating 2,6-diethylnaphthalene from a mixture of diethylnaphthalene isomers by contacting said mixture with zeolite producing the same powder X-ray diffraction pattern as faujasite and the method can efficiently separate 2,6-diethylnaphthalene from ethylation reaction products containing diethylnaphthalene isomers.

Abstract: A totally contained adsorption process for the substantial total removal and conversion of benzene to cyclohexane in gasoline boiling range streams. At least a portion of the gasoline boiling range stream is passed through an adsorption zone containing an adsorbent which will selectively adsorb benzene from the stream. The process is totally contained in the sense that substantially total conversion of benzene to cyclohexane is achieved without the need for added desorbent. The desorbent is cyclohexane which is generated in the process.

Abstract: To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio of the solvent to charge flow rates ob 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25.degree. to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which si then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.

Abstract: The present invention is an integrated catalytic reforming/hydrodealkylation process that maximizes benzene recovery by incorporating refrigeration and pressure swing adsorption separation units. In the refrigeration separation unit, liquid reformate is used as a sponge oil to recover benzene from a hydrodealkylation purge gas stream, which in the past has been vented. The pressure swing adsorption unit remove impurities from a hydrogen-rich gas stream prior to use in the hydrodealkylation unit.

Abstract: The invention relates to a process for the separation cf various dialkyl multinuclear aromatic compounds from a feed stream of mixed isomers of those compounds. A shape selective adsorbent is employed resulting in a process that is more efficient than processes based upon prior separation techniques. Of special interest are combination processes involving synthesis steps followed by sorption steps using the same shape selective materials.

Abstract: A process for selectively reducing the 5-isopropenyl-2-norbornene content of a dicyclopentadiene composition by contacting a 5-isopropenyl-2-norbornene containing DCPD composition with an acid clay.

Abstract: The separation of durene in high purity from coal tar or petroleum fractions by an adsorptive chromatographic process and liquid phase with lithium-exchanged X zeolite as the adsorbent and liquid aromatic desorbents.

Abstract: A process for purifying linear paraffins in which a hydrocarbon stream containing linear paraffins contaminated with aromatics, sulfur-, nitrogen-, and oxygen-containing compounds, and color bodies, but essentially free of olefins, is contacted with a zeolitic solid adsorbent such as a NaX zeolite or zeolite MgY. After adsorption the zeolitic solid adsorbent is desorbed with an alkyl-substituted aromatic desorbent such as toluene.

Abstract: A method for the separation of benzene from a hydrocarbon stream, such as a gasoline boiling range stream, which comprises contacting the hydrocarbon stream with an adsorbent capable of selectively adsorbing the benzene from the stream, hydrogenating the adsorbed benzene to cyclohexane, and desorbing the cyclohexane from the adsorbent. The hydrogenation of the benzene to cyclohexane facilitates the removal of the benzene from the adsorbent.