�ber die Verteilung von Nitraten Seltener Erden zwisehen w��rigen L�sungen und organischen L�sungsmitteln

Solvent Extraction of Inorganic Species.

“…The extraction of cerium(IV) by butyl acetate ( 223), diethyl ether (38), diisopropyl ether (37) and nitromethane (443) has been noted. It is usually assumed that the species extracted by ether is (H(solvated))2+ Ce(N03)e, following Wylie's suggestion (451) (but he also suggested 0ß( 03)3).…”

Photoelektronen‐Spektren und Moleküleigenschaften. 133 [1, 2]. Trifluormethyldisulfan und Derivate F3CSSX (X  CF3, F, Cl, Br)

“…Chem. 61 1 (I 992) ~~ Delokalisation der positiven Ladung sowohl an benach-w/HS-SH) = 91 ") wird die beobachtete Aufspaltung barte Zentren rnit Elektronenpaaren n, [3 -5, 7 -1 I] als AIE;,z = 0,27 eV [5, 71 im MO-Bild durch die Annahme auch in die Kohlenwasserstoff-Reste in gesattigten [3, 5, zusatzlicher n;(a)/o,,(a)-Wechselwirkungen erklart [5,6,9,11,121 und ungesattigten [9,11,. Die grorjere Aufspaltung in FSSF (2: AIEY,2 = 0,41 eV schwefel-Verbindungen, z.…”

“…Relativ zu Dimethyldisulfan (1: w(CS-SC) = 84") weist das Di(tert.buty1)-Derivat nach einer geometrieoptimierten MNDO-Berechnung o(CS-SC) = 110" und damit zwischen den n,"-Elektronenpaaren nur noch w = 70" auf (2: A I E z = 0,65 eV). Eine der grol3ten bekannten n,"-/n,"+ -Aufspaltungen [9] wird fur 1,2-Dithiolan gemessen (2: L~IEY,~ = 1,72 eV [8]), da der Diederwinkel o(CS-SC) in gesattigten Funfring-Disulfiden nur noch 27" (1) betragt.…”

Solvent Extraction.

“…Miscellaneous Processes. Typical of the diverse separations that have received attention are the following: vanillin from alkaline liquor solutions with íerí-butanol (145); acetic acid from water by various solvents (126); glycerol from fermentation concentrates by isopropyl alcohol (108); hydrocarbons from organic nitrites by methanol solutions of calcium chloride (97); caffeine from coffee extracts with water, ether, and chloroform (69); ketones from their mixtures with aqueous alcohol by white mineral oil (52); halogenated aromatic hydrocarbons from those containing no halogen with furfural, ethanol, and water (147); ethyl ether from impurities with aqueous sodium bisulfite (34); concentrated or even anhydrous hydrogen fluoride from water by cyclo-olefins such as cyclohexene (19); various organic compounds produced in the Fischer-Tropseh process (18); water from tetrahydrofuran by glycerol (15); organic acids from each other by fractional extraction (172); m-and p-cresols from each other by aqueous caustic soda and benzene (173); wax from cachaza by heptane in a liquid-liquid process (162); metallic lead from tin by molten stannous chloride (10); americium from some rare earth metals in aqueous hydroxamic acid with chloroform (165); zirconium from hafnium in aqueous hydrogen chloride with benzene-trifluoroacetylacetone (151); neptunium from impurities with ether (47); and various rare earth nitrates from each other with several solvents (11). A review of liquid-liquid extraction processes for waste sulfite liquor was made by McLaughlin (98).…”