Pechiney Ugine Kuhlmann

In the initial thiocyanate-complex Hquid—Hquid extraction process (42,43), the thiocyanate complexes of hafnium and zirconium were extracted with ether from a dilute sulfuric acid solution of zirconium and hafnium to obtain hafnium. This process was modified in 1949—1950 by an Oak Ridge team and is stiH used in the United States. A solution of thiocyanic acid in methyl isobutyl ketone (MIBK) is used to extract hafnium preferentially from a concentrated zirconium—hafnium oxide chloride solution which also contains thiocyanic acid. The separated metals are recovered by precipitation as basic zirconium sulfate and hydrous hafnium oxide, respectively, and calcined to the oxide (44,45). This process is used by Teledyne Wah Chang Albany Corporation and Western Zirconium Division of Westinghouse, and was used by Carbomndum Metals Company, Reactive Metals Inc., AMAX Specialty Metals, Toyo Zirconium in Japan, and Pechiney Ugine Kuhlmann in France. 

Materials. Pluronic FI27 was a gift from Pechiney Ugine Kuhlmann and was used as received. Pluronic F127 is an ABA poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) block copolymer containing approximately 70% oxyethylene with a nominal molecular weight of 1.15 x 10. ... 

PCUK Produits Chimiques, Ugine Kuhimann, Paris, France Daughter of Pechiney Ugine Kuhlmann (up to 1982). 

Acknowledgments. I thank the Centre National de la Recherche Scientifique, the Delegation G n rale i la Recherche Scientifique et Technique (ComitS ASCO), Pechiney Ugine Kuhlmann, the Societe Nationale des Poudres et Explosifs and the Nobel Hoechst Society for their financial support. 

SOLNOX A process for manufacturing nitric acid developed by Pechiney-Ugine-Kuhlmann. 

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