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Ar is removed from a feed O-Ar stream to yield a high purity O stream by passing the feed gas at -30 to 100 °C and 5-160 psia over an adsorbent bed of an Ag ion-exchanged X zeolite, where 80% of the available ion sites are occupied by Ag such that at least a portion of the Ar in the feed gas is adsorbed by the adsorbent bed, leaving an O-enriched gas stream.
In a method for decreasing PhEt in a hydrocarbon feed raw material (substantially consisting of PhEt and a mixture of xylene isomers), PhEt is selectively decomposed by treating the hydrocarbon feed in the presence of a catalyst consisting of (1) MgO supported on silica/alumina (molecular ratio 10), which is a pentasil-type crystalline aluminosilicate zeolite with at least 10% of the cation site being...
A mixture of C 2-4 hydrocarbons is reacted in a fixed catalyst bed and then in a fluidized bed, at 1-5 bar and 400-700 °C, and the reaction products are cryogenically separated into H 2 , C 3 , and C 4 gases that are recycled to the process, aromatics, light C 1-2 gases, olefins, and paraffins. The catalyst is either a MFI zeolite, synthesized...
Liquid foods, especially coffee, are sterilized by incubation with the silver ion-containing sepiolite, heating for 1 s at 140 °C and removal of the sepiolite. Because the sterilization time is short and the sterilization temperature is reduced, the organoleptic qualities of the liquid foods are retained.
Aliphatic C 6 carboxylic acids (e.g., AcOH) are prepared by contacting an aliphatic alcohol (e.g., MeOH) with CO in the presence of a Cu-, Ni-, Ir-, Rh-, or Co-loaded mordenite zeolite catalyst.
A process yielding a product enriched in branched olefins involves contacting the feedstock with a tectometallosilicate having a ferrierite crystal structure at an olefin partial pressure of 0.5 bar.
In the hydrothermal synthesis of crystalline microporous zeolite from a reaction system containing an organic templating agent, some of the N-containing templating agent is removed prior to the formation of crystalline product so that yield of the product is increased. The removal of the organic reagent disrupts the equilibrium and shifts the reaction toward the formation of additional product before...
m-Xylene (I) is isolated from I-containing C 8 arene mixtures by selective adsorption of I by treating the mixtures with Na-containing Y zeolite adsorbents with 5 silica molar ratio including 145 °C b.p. alkylarenes followed by desorption of I with desorption agents.
A method for industrially preparing methylamines by which the production of Me 2 NH and MeNH 2 is increased and production of Me 3 N is decreased comprises reacting MeOH with NH 3 in the gaseous phase in the presence of a mordenite modified with a silylating agent by a silylation treatment in a liquid phase.
Hydrophilicity (defined as the water content) of 43 zeolites is estimated with an accuracy of 15.2% using the aluminum fraction (X 1 ) and the void fraction (X 2 ) as the inputs. The water content due to the aluminum fraction (0.1213 X 1 ) derived from the equation is then correlated by means of the equalized electronegativity (X eq ) of 57 zeolites with an overall...
Hydrocarbons are removed from a gaseous mixture that includes water and hydrocarbons by contacting the mixture with a first stage comprising hydrophilic material (e.g., type A, L, or X zeolites, chabazite, erionite, clinoptilolite, ferrierite, phillipsite, mazzite, offretite, aluminophosphates, and silicoaluminophosphates) to remove at least some of the water and produce a drier mixture and thereafter...
In the selective separation of 2,6-dimethylnapthalene (I) from a mixture of dimethylnaphthalene isomers, a cation-exchanged Y zeolite is used as the adsorbent, and m-xylene is used as the solvent. The method gives highly pure I.
A gaseous alkene is separated from a gaseous alkane by pressure-swing adsorption alone or in combination with distillation wherein the alkene is preferentially adsorbed onto a bed of 4A zeolite at a temperature of at least about 50 °C and preferably in the range of 50-200 °C. Typically, the alkane is propane and the alkene is propylene; alternatively, the alkane may be ethane and the alkene ethylene.
Fully anhydrous ion exchange into zeolite single crystals was attempted using nonaqueous solutions. Under various conditions, Na-A was exposed to flowing solutions of CuCl, CuCl 2 , and CuSO 4 in acetonitrile and of CuCl 2 in methanol. Na-A was treated with dimethyl sulfoxide solutions of Pb(NO 3 ) 2 and, at 140°C, KNO 3 . Finally, Na-A and Na-X were...
A catalyst for purifying exhaust gas includes a zeolite carrier having a molar ratio of SiO 22 O 3 of 20-200 and a compound oxide of copper and silicon supported on the carrier. The catalyst has high activity for elimination of nitrogen oxides (NO x ) even in the presence of both oxygen and water vapor and also has excellent durability at high temperatures.
The porous materials have an X-ray diffraction pattern as presented, with no peaks at positions <10 d-spacing with relative intensity >20% of the strongest peak, and composition M n (W a X b Y c Z d O h ) (M is one ions; n = charge of composition excluding M expressed as oxide; q = weighted molecular average valence of M; nq = no. of...
Various aluminophosphate and silicoaluminophosphate molecular sieves were treated with methanolic HCI to see its effectiveness as an alternative route for removing organic template molecules from molecular sieves. Both calcined and methanolic HCI-treated samples were characterized by X-ray powder diffraction and water adsorption-desorption isotherm measurements. The effectiveness of methanolic HCI...
The vessel comprises the vessel itself and a lid at least having their inner surfaces coated with noble metal (e.g., Pt) of 3-30 μm thickness and chamfered noble metal (e.g., Pt) seals intervened between them. The vessel is used for hydrothermal synthesis of silicoaluminophosphate zeolite (SAPO). Impurity contamination is prevented.
ZSM-5 has been synthesized at 90 and 130°C in reactor systems in which reagents were supplied continuously, and homogeneous product slurry was withdrawn semicontinuously. In some cases, precursor crystals were nucleated in situ, whereas other preparations started from dispersions of seed crystals. Guided by a simple mathematical model, conditions were chosen to give a steady, near-linear crystal...
Halogenated hydrocarbons, such as R 11, R 12, and R 13, are removed from moist gases such as industrial air by adsorption on hydrophobic molecular sieves such as dealuminated zeolites with Si ratio >10 and pore diameter 0.4-1.5 nm.
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