Abstract: This invention relates to a process for the recovery of indium from aqueous acid solutions. More particularly, it concerns the use of a combination of a dialkyl phosphoric acid and a mixture of trialkyl phosphine oxides to extract indium from acidic sulphate leach liquors.

Abstract: Allylphosphines and vinylphosphines are prepared by reaction of a phosphine with an allylhalide or a vinylhalide, respectively. Preferably the phosphine is a secondary phosphine, so that there is formed an allyldialkylphosphine or a dialkylvinylphosphine. The allyldialkylphosphine can be reacted further with dialkylphosphine under free radical conditions to yield a 1,3-bis-(dialkylphosphino)propane. The dialkylvinylphosphine can be reacted further with dialkylphosphine under free radical conditions to yield a 1,2 bis-(dialkylphosphino)ethane. These compounds are useful as bidentate ligands.

Abstract: Various 1,4-disubstituted-2,3,5,6-tetrohydroxy-1,4-diphosphorinanes, their oxides and sulfides, methods for the production thereof, and flame-retarded compositions of matter containing them, are disclosed.

Abstract: There is disclosed a novel method for enhancing the flow of particulate material, particularly carbide-based desulfurizing agents (DSR's) used for the removal of sulfur from hot metal. A novel composition is also taught in which the DSR is in admixture with an organic, polar liquid flow promoter. The novel composition has improved flow characteristics or flowability and reduces the possibility of clogging in conduits and lances.

Abstract: Free Radical Addition of Mono 2,4,4'-trimethylpentylphosphine to cyclohexene followed by the oxidation of the 2,4,4'-trimethylpentyl, cyclohexylphosphine with two moles of hydrogen peroxide is employed to prepare 2,4,4'-trimethylpentyl, cyclohexylphosphinic acid. The 2,4,4'-trimethylpentyl, cyclohexylphosphinic acid is useful as a cobalt extractant.

Abstract: Dialkylphosphine is added to a mixture of sulfur and water at 50.degree.-90.degree. C. After approximately 25% of the dialkylphosphine is charged, an alkali, such a sodium hydroxide, is added to neutralize the dialkyldithiophosphinic acid that forms. At this elevated temperature the neutralization reaction proceeds rapidly thereby preventing any alkali from reacting with the sulfur to form sulfides. Dialkyldithiophosphinate yields from this process are on the order of about 95-98%.

Abstract: Preparation of crystalline water-insoluble ammonium polyphosphate through processing a melt of urea and phosphoric acid or alternatively processing solid urea phosphate. Contact between the exiting product and recycled gaseous by-products ensures proper pH.