Abstract: A process for the separation of butene-1 from other C4 mono-olefins. A feed stream containing butene-1 is contacted with a K-X zeolite which selectively adsorbs butene-1. The butene-1 is desorbed using a mixture of hexene-1 and cyclohexene or cyclohexane.

Abstract: An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers, which process comprises contacting the feed mixture with an adsorbent comprising strontium exchanged type X or type Y zeolite, selectively adsorbing substantially all of the said xylene isomers to the substantial exclusion of the ethylbenzene and thereafter recovering high-purity ethylbenzene. A desorption step may be used to desorb the adsorbed xylene isomers. The process can be either in the liquid or vapor phase.

Abstract: An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which process comprises contacting the feed mixture with an adsorbent comprising strontium and potassium exchanged type X or type Y zeolite, selectively adsorbing substantially all of the said xylene isomers to the substantial exclusion of the ethylbenzene and thereafter recovering high-purity ethylbenzene. A desorption step may be used to desorb the adsorbed xylene isomers. The process can be either in the liquid or vapor phase.

Abstract: A process for separating an ester of a polyethanoid fatty acid and an ester of a monoethanoid fatty acid from a mixture comprising an ester of a polyethanoid fatty acid, an ester of a monoethanoid fatty acid and an ester of a saturated fatty acid which process comprises contacting the mixture at first adsorption conditions with a first adsorbent comprising a X or a Y zeolite containing a selected cation at the exchangeable cationic sites thereby selectively adsorbing the ester of a polyethanoid fatty acid and thereafter recovering the ester of a polyethanoid fatty acid; removing from the first adsorbent a second mixture comprising an ester of a monoethanoid fatty acid and an ester of a saturated fatty acid; contacting the second mixture at second adsorption conditions with a second adsorbent comprising a X or a Y zeolite containing selected cations at the exchangeable cationic sites thereby selectively adsorbing the ester of a monoethanoid fatty acid and thereafter recovering the ester of a monoethanoid fatty

Abstract: A process for the separation of the para-isomer from a hydrocarbon feed mixture comprising at least two bi-alkyl substituted monocyclic aromatic isomers, including the para-isomer, said isomers having from 8 to about 18 carbon atoms per molecule, which process employs an adsorbent comprising a X or a Y zeolite containing selected cations at exchangeable cationic sites to preferentially adsorb the para-isomer. The para-isomer thereafter is removed from the adsorbent by contacting it with a desorbent material and is recovered as a product stream. In a preferred embodiment the process uses a simulated-moving-bed counter-current flow system.

Abstract: A process for separating an ester of an unsaturated fatty acid from a mixture comprising an ester of an unsaturated fatty acid and an ester of a saturated fatty acid which process comprises contacting the mixture at adsorption conditions with an adsorbent comprising a X or a Y zeolite containing one or more selected cations at the exchangeable cationic sites thereby selectively adsorbing the ester of an unsaturated fatty acid. Preferably the ester of an unsaturated fatty acid will be recovered from the adsorbent by desorption with a desorbent material.

Abstract: A method for the production of an adsorbent, having increased capacity for olefins and decreased catalytic activity for polymerization and isomerization, useful in the separation of olefins from a hydrocarbon mixture comprising olefins and paraffins. The methods basically comprises contacting a precursor mass comprising sodium X or sodium Y zeolite and amorphous material selected from the group consisting of silica, alumina and silica-alumina mixtures and compounds as a binder with an aqueous sodium hydroxide solution to increase the sodium cation content of the zeolite and to remove a small portion of silica and alumina; washing the zeolite with water to remove excess caustic solution; and, drying the zeolite to reduce the volatile content.

Abstract: A process for separating an ester of a monoethanoid fatty acid from a mixture comprising an ester of a saturated fatty acid and an ester of an unsaturated fatty acid consisting essentially of an ester of a monoethanoid fatty acid which process comprises contacting the mixture at adsorption conditions with an adsorbent comprising a X or a Y zeolite containing selected cations at the exchangeable cationic sites thereby selectively adsorbing the ester of a monoethanoid fatty acid. Preferably the ester of a monoethanoid fatty acid will be recovered from the adsorbent by desorption with a desorbent material.

Abstract: A process for the separation of a para-isomer from a hydrocarbon feed stock containing alkyl-aromatic hydrocarbons having more than eight carbon atoms per molecule which employs a crystalline aluminosilicate adsorbent containing a particular cation or cations to selectively adsorb either a para-, meta-, or ortho- isomer from the feed stock. A feed stock contacts an adsorbent which allows one or more isomers from the feed stock to be selectively adsorbed by the adsorbent. The selectively adsorbed component is thereafter recovered from the adsorbent in a more pure form as compared to the other isomers in the feed stock. The process can be performed in both the liquid or vapor phase.

Abstract: An improved process for the separation of olefins from a hydrocarbon feed mixture comprising olefins and saturates which process uses an adsorbent comprising sodium type X or sodium type Y zeolite to selectively adsorb the olefins. The improvement comprises employing an adsorbent produced by the steps of: contacting a precursor mass comprising type X or type Y zeolite having a Na.sub.2 O/Al.sub.2 O.sub.3 ratio less than about 0.7 with an aqueous sodium hydroxide solution at ion exchange conditions to effect the addition of sodium cations to the mass and the removal of a small amount of silica and alumina, washing the mass with water to remove excess sodium hydroxide solution; and, at least partially dehydrating the mass at dehydrating conditions thereby producing an adsorbent which has both increased capacity for olefins and decreased catalytic activity.

Abstract: An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers, which process comprises contacting the feed mixture with an adsorbent comprising strontium exchanged type X or type Y zeolite, selectively adsorbing substantially all of the said xylene isomers to the substantial exclusion of the ethylbenzene and thereafter recovering high-purity ethylbenzene. A desorption step may be used to desorb the adsorbed xylene isomers. The process can be either in the liquid or vapor phase.

Abstract: An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers which process comprises contacting the feed mixture with an adsorbent comprising strontium and potassium exchanged type X or type Y zeolite, selectively adsorbing substantially all of the said xylene isomers to the substantial exclusion of the ethylbenzene and thereafter recovering high-purity ethylbenzene. A desorption step may be used to desorb the adsorbed xylene isomers. The process can be either in the liquid or vapor phase.

Abstract: An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and a plurality of xylene isomers, which process comprises contacting the feed mixture with a crystalline aluminosilicate adsorbent comprising a sodium-type Y zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio greater than about 4.5, selectively adsorbing substantially all of the said xylene isomers to the substantial exclusion of the ethylbenzene and recovering high-purity ethylbenzene. A desorption step may then be used to desorb the adsorbed xylene isomers. The process can be either in the liquid or vapor phase.

Abstract: A process for separating para-xylene in high purity and at high recovery from a feed stream comprising para-xylene and at least one other C.sub.8 aromatic isomer which employs an adsorbent comprising a type X or a type Y zeolite containing barium and strontium at the exchangeable cationic sites in a weight ratio of barium to strontium of from about 1:1 to about 15:1 to selectively adsorb para-xylene from the feed stream and a desorbent material comprising para-diethylbenzene to remove the adsorbed para-xylene from the adsorbent.

Abstract: A process for the separation of the para-isomer from a hydrocarbon feed mixture comprising at least two bi-alkyl substituted monocyclic aromatic isomers, including the para-isomer, said isomers having from 8 to about 18 carbon atoms per molecule which process employs an adsorbent comprising a type Y zeolite essentially completely exchanged with a single cation selected from the group consisting of potassium, cesium, and rubidium. The feed mixture is passed through a bed of the adsorbent wherein the para-isomer is preferentially adsorbed within the adsorbent and thereafter recovered from the adsorbent.

Abstract: An improved process for the separation of a para-cresol from a feed mixture containing para-cresol and at least one other cresol isomer which process employs a crystalline aluminosilicate adsorbent to selectively adsorb para-cresol from the feed mixture. The improvement basically comprises employing a desorbent material comprising an alcohol to increase the selectivity of the adsorbent for para-cresol thereby allowing a more efficient separation with a higher purity extract stream recovered from the process.

Abstract: An improved process for the separation of olefins from a hydrocarbon feed mixture comprising olefins and saturates which process uses a zeolite adsorbent to selectively adsorb the olefins. The improvement comprises employing a zeolite adsorbent produced by the steps of: contacting a precursor mass containing type X structured zeolite and amorphous material as a binder with an aqueous caustic solution to effect the addition of alkali metal cations to the crystalline structure; washing the mass with water to remove therefrom excess caustic solution; and, at least partially dehydrating said mass at dehydrating conditions thereby producing an adsorbent which has both increased capacity for olefins and decreased catalytic activity.

Abstract: An adsorptive separation process for separating ethylbenzene from a feed mixture comprising ethylbenzene and at least one xylene isomer, which process comprises contacting the feed mixture with a crystalline aluminosilicate adsorbent comprising type X structured zeolite containing at the exchangeable cationic sites at least one cation selected from the group consisting of cations of elements of Group I-A of the Periodic Table of Elements to effect the selective adsorption of ethylbenzene. The ethylbenzene adsorbed by the adsorbent is thereafter recovered as a purified product. The process can be either in the liquid or vapor phase.