Illinois

Wittrig, T. S., "The Prediction of Liquid-Liquid Equilibria by the UNIQUAC Equation," B.S. Degree Thesis, University of Illinois, Urbana (1977). 

HITTRIG,T S /8.S. DEGREE THESIS,JNIVERSITY OF ILLINOIS, ORSANAtlLL.I1977) ... 

Karl F. Freed, The James Franck Institute, The University of Chicago, Chicago, Illinois, U.S.A. 

Beckman Institute, University of Illinois at UrbanarChampaign, 405 N. Mathews, Urbana, IL 61801, USA... 

D. Okunbor and R. D. Skeel. Explicit canonical methods for Hamiltonian systems. Working document. Numerical Computing Group, University of Illinois at UrbanarChampaign, 1991. 

Beckman Institute and Department of Computer Science University of Illinois at Urbana Champaign... 

Theoretical Biophysics Group, University of Illinois and Beckman Institute,... 

C. E. Shannon, WW. Weaver, Mathematical Theory of Communication. University of Illinois Press, Chicago, 1949. 

Levinthal C 1969. In Debruimer P, J C M Tsibris and E Munck (Editors) Mossbauer Spectroscopy in Biological Systems, Proceedings of a Meeting held at Allerton House, Monticello, Illinois, University of Illinois Press, Urbarra, p. 22. 

Obtainable from Parr Instrument Co., Moline, Illinois, U.S.A. An equivalent apparatus is manufactured by American Instrument Co., Silver Springs, Maryland, U.S.A-, and by C. W. Cook and Sons Ltd., 97, Walsall Road, Birmingham, 22B, England. 

John E. Bauer Illinois State University Ali Bazzi... 

Alexander Scheeline University of Illinois James D. Stuart University of Connecticut... 

Tripoli. TripoH [1317-95-9] is a fine grained, porous, decomposed siHceous rock produced mainly in Arkansas, Illinois, and Oklahoma. It is widely used for polishing and buffing metals, lacquer finishing, and plated products. Since tripoH particles are rounded, not sharp, it has a mild abrasive action particularly suited for polishing. TripoH is also used in toothpastes, in jewelry polishing, and as filler in paints, plastics, and mbber. Rottenstone and amorphous siHca are similar to tripoH and find the same uses. In 1987 the abrasive use of tripoH in the United States totaled 26.6 million tons and was valued at about 3.1 million however, the portion used as a filler totaled 71.1 million tons and had a value of almost 10 million (4). 

Such a concept was originally used in a process developed and Hcensed by UOP under the name UOP Sorbex (59,60). Other versions of the SMB system are also used commercially (61). Toray Industries built the Aromax process for the production of -xylene (20,62,63). Illinois Water Treatment and Mitsubishi have commercialized SMB processes for the separation of fmctose from dextrose (64—66). The foUowing discussion is based on the UOP Sorbex process. 

Making Waves in EiquidProcessing Illinois Water Treatment Company, IWT Adsep System, Rockford, IU., 1984, VI (1). 

Another dynamic iastmment, the Scentometer, is the basis for odor regulations ia the states of Colorado, Illinois, Kentucky, Missouri, Nevada, and Wyoming, and ia the District of Columbia (324). The portable Scentometer (Bameby-Cheney) can produce dilution ratios up to 128 1 ia the field. The Scentometer blends two air streams, one of which has been deodorized with activated carbon. The dilution ratio is decreased until the odor becomes detectable (325). Improvements to dynamic methods have been recommended (326). 

J. A. E. Hannum, ed., Ha ards of Chemical Eockets and Propellants, 3 vols., Illinois Institute of Technology, Chicago, June 1985. 

J. W. Patterson and R. W. Minear, State of the Pirtfor the Inorganic Chemicals Industy Commercial Explosives PB 240 960, Illinois Institute of Technology, Chicago, 1975. 

D. R. Mouta and co-workeis, Mayards Analysis of the Final Design of the Improved Black Powder Process, Vols. 1—2, Rpt. J6329, Illinois Institute of Technology, Chicago, 1963. 

R. W. Hit2man, Identification and Elucidation ofiEactors Contributing to Eligh Quality BeefiFlarors, Ph.D. dissertation, University of Illinois, Urbana, 1986. 

Information courtesy of Flavor Knowledge Systems, Glenview, Illinois. FEMA and FDA Hstiugs. 

The ores of most importance are fluorspar, CaF2 fluorapatite, Ca (P0 2Fj cryoHte [15096-52-3], Na AlF. Fluorspar is the primary commercial source of fluoiine. Twenty-six percent of the world s high quaHty deposits of fluorspar are ia North America. Most of that is ia Mexico. United States production ia 1987—1991 was 314,500 metric tons, most of which occurred ia the Illinois-Kentucky area. Imported fluorspar ia 1990—1991 represented about 82% of U.S. consumption 31% of U.S. fluorspar imports were from Mexico and 29% from China compared to 66% from Mexico ia the 1973—1978 period. The majority of the fluorine ia the earth s cmst is ia phosphate rock ia the form of fluorapatite which has an average fluorine concentration of 3.5%. Recovery of these fluorine values as by-product fluorosiHcic acid from phosphate production has grown steadily, partially because of environmental requirements (see Phosphoric acid and THE phosphates). 

Fluorspar deposits ate commonly epigenetic, ie, the elements moved from elsewhere into the country rock. For this reason, fluorine mineral deposits ate closely associated with fault 2ones. In the United States, significant fluorspar deposits occur in the Appalachian Mountains and in the mountainous regions of the West, but the only reported commercial production in 1993 was from the faulted carbonate rocks of Illinois. 

Fluorspar occurs in two distinct types of formation in the fluorspar district of southern Illinois and Kentucky in vertical fissure veins and in horizontal bedded replacement deposits. A 61-m bed of sandstone and shale serves as a cap rock for ascending fluorine-containing solutions and gases. Mineralizing solutions come up the faults and form vein ore bodies where the larger faults are plugged by shale. Bedded deposits occur under the thick sandstone and shale roofs. Other elements of value associated with fluorspar ore bodies are zinc, lead, cadmium, silver, germanium, iron, and thorium. Ore has been mined as deep as 300 m in this district. 

R. H. Shiley, D. R. Dickerson, and G. C. Finger, Aromatic Fluorine Chemisty at the Illinois State Geological Survey, circular 501, Urbana, lU., 1978. 

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