Abstract:
Clinoptilolites, including both natural clinoptilolites and those which have been ion-exchanged with metal cations such as lithium, sodium, potassium, calcium, magnesium, barium, strontium, zinc, copper, cobalt, iron and manganese, are useful for the removal of traces of carbon dioxide and water from streams of hydrocarbons having kinetic diameters of not more than about 5 .ANG..
Abstract:
Natural clinoptilolites which have been ion-exchanged with particular proportions of metal cations such as lithium, sodium, potassium, calcium, magnesium, barium, strontium, zinc, copper, cobalt, iron and manganese, are novel and useful for the removal of traces of carbon dioxide and water from streams of hydrocarbons having kinetic diameters of not more than about 5.
Abstract:
Carbon dioxide is selectively adsorbed and separated from non-acidic gases such as nitrogen, hydrogen and methane using a pressure swing adsorption process in a fixed adsorption bed containing a faujasite type of zeolitic aluminosilicate containing at least 20 equivalent percent of at least one cation species selected from the group consisting of zinc, rare earth, hydrogen and ammonium and containing not more than 80 equivalent percent of alkali metal or alkaline earth metal cations.
Abstract:
Clinoptilolites, including both natural and synthetic clinoptilolites which have been ion-exchanged with metal cations such as lithium, sodium, potassium, calcium, magnesium, barium, strontiun, zinc, copper, cobalt, iron and manganese, are useful for the removal of traces of ammonia from streams of hydrocarbons having kinetic diameters of not more than about 5 .ANG.. This invention relates to the process of producing the modified clinoptilolite adsorbent.
Abstract:
Clinoptilolites, including both natural and synthetic clinopilolites which have been ion-exchanged with metal cations such as lithium, sodium, potassium, calcium, magnesium, barium, strontium, zinc, copper, cobalt, iron and manganese, are useful for the removal of traces of ammonia from streams of hydrocarbons having kinetic diameters of not more than about 5.ANG.. The purified hydrocarbons are useful for producing polyolefins.
Abstract:
An adsorption arrangement in combination with a catalytic hydrocarbon conversion process suspends non-hydrocarbon materials that act to enhance the operation of the conversion zone by using an adsorption zone arrangement to keep the compounds in recirculation about the reaction zone. The process of this invention is particularly useful for the isomerization of hydrocarbons wherein the adsorption zone arrangement operates to maintain chloride compounds in the reaction zone and to prevent contamination of product streams with the chloride compounds. This invention can be used in combination with traditional adsorptive methods of removing contaminant from feedstreams that enter reaction zones. The invention is also useful for sulfided catalysts where it is desirable to maintain sulfur within the reaction zone and keep sulfur contamination from entering product streams.
Abstract:
A process for the separation of arabinose is disclosed which comprises the selective adsorption of same on BaX zeolitic molecular sieves. The process is especially useful for separating arabinose from mixtures of sugars containing arabinose.
Abstract:
Cyclohexanone is selectively adsorbed from admixture with cyclohexanol using specific cationic forms of zeolite X and zeolite Y. The process utilizes the interaction of the electrostatic field of the zeolite with the slightly greater polarity of the cyclohexanone to enhance the adsorptive strength difference between the competing adsorbates.
Abstract:
Processes are disclosed for the separation of hydrogen sulfide from feedstreams containing hydrogen sulfide and hydrocarbons by adsorption using a clinoptilolite adsorbent containing cations having ionic radii of from about 1.10 to 1.40 Angstroms. The processes can provide substantially enhanced adsorption capacities as compared with other adsorbents such as Zeolite 4A. As a result, a throughput of existing sulfur adsorption plants can be increased, e.g., by about 100%. The processes can be operated at elevated adsorption temperatures, e.g., greater than about 200.degree. F., and thus are particularly suitable when integrated with other processing steps such as hydrocarbon conversion reactions that utilize catalysts which are sulfur-sensitive. In addition, the clinoptilolite adsorbents of the present invention have a high tolerance to environments that comprise halides, e.g., HCl.
Abstract:
A process for the bulk separation of inositol and/or sorbitol is disclosed which comprises the selective adsorption of same on certain types of zeolitic molecular sieves. The process is especially useful for separating inositol from aqueous solutions containing same, using type X and type Y zeolite adsorbents whose cations are Na, Ca or Ba.