Air separation properties

Singh-Ghosal, A. and W.J. Koros, Air separation properties of flat sheet homogeneous pyrolytic carbon membranes, /. Membr. Sci., 174,177,2000. 

Kramer, P.W. Yasuda, H. Effect of operational parameters on the air separation properties of composite hollow fiber membranes prepared by plasma polymerization of perfluorodimethyl cyclobutane. J. Appl. Polym. Sci. Appl. Polym. Symp. 1988, 42, 381. 

The work reported here describes the preparation and characterization of highly crystalline self-bound LSX from a porous metakaolln precursor and the superior air separation properties observed for the calcium form. 

We believe that the difference 1n N2 capacity for a packed-bed vs. a shallow bed 1s directly attributable to the poor hydrothermal stability of this adsorbent. Nevertheless, the self-bound CaLSX after dehydration 1n a packed-bed displays the best air separation properties of any pelletized N2-select1ve adsorbent reported. 

Air separation properties (both Na/Oj selectivity and Na capacity) for CaLSX are superior to any other pelletized Na selective adsorbent reported. 

The field of PSA air separation is one that has been under research and development for half a century now. The field may be considered well plowed. Further there is great deal of intellectual property that is owned by a wide range of companies. 

Plate-fin exchangers provide a very large heat transfer surface per unit volume and are relatively inexpensive per unit area. They are not mechanically cleanable and are ordinarily used only with very clean fluids. This combination of properties fits them very well for a wide variety of cryogenic applications, such as air separation helium separation, purification, and liquefaction liquefied natural gas production and separation of light hydrocarbons. They are also used in higher-temperature gas-to-gas services. 

The high solubility and high stability of substituted polyacetylenes are the two most important properties which are not seen with polyacetylene. Consequently, stable membranes can be easily obtained by casting solutions of substituted polyacetylenes. This will greatly facilitate their application. Here, we refer to several functions of substituted polyacetylenes, which might be applied to oxygen enrichment of air, separation of ethanol-water mixtures, and so on. 

Air leakage, vacuum systems, 164, 165 other gases, 165 Air properties, 674 Air separation process, 37 Air-water interaction, 231-234... 

Thus, the permeation of hydrocarbons in polymer membranes is governed by the basic regularities typical of permeation of low MW penetrants, modified however by certain peculiarities related to the stmcture and shape of hydrocarbon molecules. We will now discuss the physicochemical regularities of hydrocarbon separation and removal using polymer membranes, by trying to reveal the relationship between the chemical stmcture of polymers and their separation properties with respect to mixtures containing hydrocarbons. It follows from literary data that mbbery polymers are mainly used in gas/vapor separation processes for selective separation of hydrocarbon vapors from their mixtures with air as well as in pervaporation processes for the removal of hydrocarbons from their aqueous solutions. In practice, glassy polymers are used for separation of olefins and paraffins as well as for separation of aromatic, ahcyclic, and aliphatic hydrocarbons. 

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