tailieunhanh - Ebook Encyclopedic dictionary of named processes in chemical technology: Part 2

(BQ) The length of the dictionary entries reflects their importance and topicality. The text includes references that document the origins of the processes and review the latest developments. Written by a highly experienced and respected author, this user-friendly text is presented in a practical dictionary format that is useful for a broad audience including industrial chemists and engineers. | N Nahcolite A *flue-gas desulfurization process. Nahcolite is a mineral containing 70 to 90 percent sodium bicarbonate, which is found in Colorado. In this process, the powdered nahcolite is injected into the baghouse and the following reaction occurs: SO2 ϩ 2NaHCO3 ϩ 1 O2 ϭ Na2SO4 ϩ 2CO2 ϩ H2O 2 The solid product is dumped. Piloted by Battelle Columbus Laboratories. Genco, J. M., Rosenberg, H. S., Anastis, M. Y., Rosar, E. C., and Dulin, J. M., J. Air Pollut. Control Assoc., 1975, 25(12), 1244. Genco, J. M. and Rosenberg, H. S., J. Air Pollut. Control Assoc., 1976, 26(10), 989. Nalfining A process for purifying petroleum fractions by extraction with aqueous sodium hydroxide. Unzelman, G. H. and Wolf, C. J., in Petroleum Processing Handbook, Bland, W. F. and Davidson, R. L., Eds., McGraw-Hill, New York, 1967, 3-20. NAPFINING A process for removing naphthenic acids from petroleum fractions by extracting with aqueous alkali, using a bundle of hollow fibers. Developed by the Merichem Company, Houston, TX, and used in 19 plants in 1991. Hydrocarbon Process., 1996, 75(4), 126. Naphtachimie A gas-phase process for making high-density polyethylene in a fluidized bed. Invented by Naphtachimie in 1973, and operated by that company at Lavera, France, since 1975. . Patent 3,922,322. Natta A process for polymerizing propylene and other higher olefins, catalyzed by crystalline titanium trichloride and an alkyl aluminum compound such as triethyl aluminum. The polymer can exhibit various types of stereoregularity, depending on the catalyst and the conditions. Invented in 1954 by G. Natta at the Istituto de Chimica Industriale del Politecnico di Milano, Italy, and commercialized in 1957. Now used widely, worldwide. See also Ziegler, Ziegler-Natta. . Patents 3,112,300; 3,112,301. Natta, G., Pino, P., Corradini, P., Danusso, F., Mantica, E., Mazzanti, G., and Moraglio, G., J. Am. Chem. Soc., 1955, 77, 1708. Natta, G., J. Polymer Sci., 1955, 16, 143. Natta, G., Angew. .

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