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- W2204273778 abstract "It is said that nearly 40% of the cost of a chemical process lies in separation processes. With the growing variety of feedstocks and product mixtures, a large number of separation techniques are being adopted which make use of one or more properties of the components at the molecular level. Some of the most important molecular properties controlling the efficiency of the separation processes are molecular size and shape, electric moments and polarizability, diffusivity and other kinetic properties, and chemical reactivity. Physical adsorption, which is the subject of the present review, involves all the above-mentioned properties excluding chemical reaction. Bulk separations based on adsorption have gained prominence only recently after the advent of molecular sieve zeolites with unique adsorptive properties. Adsorptive purification, which is an extreme case of separation wherein the concentration of the minor components is very low, has been in commercial practice for a long time. All the major developments in adsorption-based separations have been based on zeolite molecular sieves. Among these, the first to gain commercial acceptance was the separation of gas or vapor mixtures by adsorption. Processes, such as N/sub 2/-O/sub 2/ separation from air, separation of light gases, and vapor-phase separation of normal/isoparaffins, have beenmore » commercialized. However, separation of liquid mixtures is a more recent development, primarily because of the difficulties in experimental techniques, commercial-scale desorption, and regeneration of the adsorbent. Some of the important commercial adsorption processes for liquids are discussed and compared in this article.« less" @default.
- W2204273778 created "2016-06-24" @default.
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- W2204273778 date "1988-11-01" @default.
- W2204273778 modified "2023-09-27" @default.
- W2204273778 title "Absorptive bulk separation by zeolite molecular sieves" @default.
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