Separation of trivalent lanthanides and actinides by solvent extraction without aqueous complexing agents

A method of separating the trivalent actinides, mainly Am and Cm, from trivalent lanthanides is presented. This method embodies the sequential use of two different solvent extractants; the first extractant would remove the heavy lanthanides from the lighter lanthanides and Am--Cm, while the second would extract Am--Cm in preference to the lighter lanthanides. In this scheme, no additional complexing agents are required. Thus, waste disposal and corrosion problems are minimized. Overall separation factors for Am--Cm from lanthanide fission products in reactor wastes may be as high as several thousand. (auth

In situ permeability modification using gelled polymer systems. Topical report, June 10, 1996--April 10, 1997

Results from a research program on the application of gelled polymer technology for in situ permeability modification are presented in this report. The objective of this technology when used with displacement processes such as waterflooding is to reduce the permeability in fractures and/or high permeability matrix zones to improve volumetric sweep efficiency of the displacement process. In production wells, the objective is to reduce water influx. The research program is focused on five areas: gel treatment in fractured systems; gel treatment in carbonate rocks; in-depth placement of gels; gel systems for application in carbon dioxide flooding; and gel treatment in production wells. The research program is primarily an experimental program directed at improving the understanding of gelled polymer systems and how these systems can be used to increase oil recovery from petroleum reservoirs. A summary of progress for research conducted in the first 10 months of a 28 month program is described in the following sections

Evaluation of the photochemical production of hydrogen from solar energy

The potential for utilizing solar energy through photochemical storage were investigated. Both water and nitrosyl chloride systems are examined. A comprehensive review of the literature led to the conclusion that many major questions must be answered before photochemical energy storage becomes a viable alternate means of exploiting solar energy

Structure determination of bromotricarbonyl([eta]-cyclopentadienyl)molybdenum(II)

This is the published version. Copyright 1990 by International Union of Crystallography.[(77-C5Hs)Mo(CO)3Br], Mr = 324-97, monoclinic, P2x/n, a = 8-186(3), b= 10-536(3), c =11-391 (3) A, p = 99-58 (2)°, V= 968-7 (6) A3, Z = 4, Dx = 2-228 g cm- 3 , A(Mo Ka) = 0-71069 A, fi =56-68 cm"1, F(000) = 616, r = 1 1 3 ( l ) K , final R =0-0261 for all 1271 independent reflections. The molecule adopts a distorted square pyramidal coordination environment about the Mo atom. The shorter Mo—C bond of the carbonyl ligand trans to the bromide apparently arises from the lack of competition for d7r bonding electrons. The longer Mo—C bonds for the mutually trans carbonyl ligands, and the squashed trans C—Mo—C angle (approximately 28° smaller than the Br—Mo—Ctrans angle) result from sharing one pair of dir bonding electrons. Selected bond distances and angles: Mo—Br =2-651(1), av. Mo—Ccis = 2-020 (6), Mo—Ctrans =1-978 (7), Mo—CPcent = 1-993 (1), av. (C—0)cis =1-132(5), (C 0)trans =1-154 (9), B r - M o - C , r _ =136-7 (2), Br—Mo—Ccis = 77-0 (3), Br—Mo-CP^= 112-04(3), av. Ctrans—Mo—C^=78-l(2), av. Cc£s—Mo—CPeent = 125-8 (2), Ctrans— Mo—CPeent *111-3 (2)

In situ permeability modification using gelled polymer systems. Annual report, April 11, 1997--April 10, 1998

Results from a research program on the application of gelled polymer technology for in situ permeability modification are presented in this report. The objective of this technology when used with displacement processes such as waterflooding is to reduce the permeability in fractures and/or high permeability matrix zones to improve volumetric sweep efficiency of the displacement process. In production wells, the objective is to reduce water influx. The research program focused on five areas: Gel treatment in fractured systems; Gel treatment in carbonate rocks; In-depth placement of gels; Gel systems for application in carbon dioxide flooding; and Gel treatment in production wells. The research program is primarily an experimental program directed toward improving the understanding of gelled polymer systems and how these systems can be used to increase oil recovery from petroleum reservoirs. A summary of progress for research conducted in the second 12 month period of a 28 month program is described