C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
252/56, 260/426.
C07F 5/00 (2006.01) C01F 17/00 (2006.01) C07C 51/41 (2006.01) C10M 115/10 (2006.01) C10M 117/02 (2006.01)
Patent
CA 1203244
PROCESS FOR PREPARING COLLOIDAL CERIC OXIDE AND COMPLEXES THEREOF WITH FREE ORGANIC ACIDS ABSTRACT OF THE DISCLOSURE A process is provided for preparing colloidal dispersions of ceric dioxide in inert organic media which comprises (1) heating (a) ceric dioxide comprising ammonium nitrate or ammonium and nitrate ions in an amount within the range from about 3 to about 14% by weight of the ceric dioxide and a member selected from the group consisting of water, methanol, acetic acid and mixtures thereof in an amount usually from about 10 to about 60 g per mole of CeO2, sufficient to effect reaction with (b) an organic acid having from about ten to about forty carbon atoms; and (c) an organic solvent selected from the group con- sisting of (i) aliphatic and aromatic hydrocarbons, such as petroleum spirits, benzene, toluene, chloro- benzene, chlorotoluene, etc. (ii) aliphatic and cycloaliphatic ethers, such as isopropyl ether or dicyclohexyl ether (iii) aliphatic and cycloaliphatic ketones, such as diisobutylketone or cyclohexanone, 25 at a temperature within the range from about 60 to about 200°C thereby effecting dispersion of the ceric dioxide; and (2) removing water, methanol, acetic acid or mixtures thereof, and separating undissolved particles of solid material such as ammonium nitrate and undissolved cerium dioxide. Association complexes are also provided, composed of ceric dioxide and organic acid having from about ten to about forty carbon atoms in a molar ratio CeO2/organic acid of at least about 4:1. The colloidal dispersions and association complexes of ceric dioxide having a high cerium content prepared in accordance with the present invention are very useful for preparing cerium soaps of organic acids which in turn are useful as driers for paints and varnishes and as thickeners in lubricating greases.
430248
Charte Vincent J.
Davison John F.
Gradeff Peter S.
Schreiber Fred G.
Gowling Lafleur Henderson Llp
Rhodia Electronics And Catalysis Inc.
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