PROCESSES FOR PRECIPITATING METAL COMPOUNDS

Preparation of deutero-hydrocarbons

Hydrocarbons containing deuterium are prepared by passing a mixture of an unsaturated hydrocarbon and deuterium oxide in the form of steam over a reducing catalyst at an elevated temperature. The preferred unsaturated hydrocarbons are acetylene and ethylene. Suitable catalysts are palladium, nickel, platinum, and alloys thereof, supported on alumina pellets. If the reaction is carried out in the presence of deuterium, reduction of the unsaturated hydrocarbon takes place. In example I, acetylene and D2O are passed over a nicel or alumina catalyst at 180 DEG C.; the product contains C2D2, C2HD, and C2H2. In Example II, acetylene, D2O and D2 are passed over a palladium on alumina catalyst at 140 DEG C. yielding a product composed of ethylene and ethane containing deuterium.

Metal recovery - from solution by sorption onto hydrous metal gel and subsq desorption

A process for extracting a metal value from a solution thereof comprising contacting said solution with entities of a hydrous metal-containing gel which sorbs the metal from the solution, and subsequently contacting the entities with a liquid which desorbs the metal from said entities.

Improvements in or relating to methods and means for producing phosphors

Trans-stilbene is prepared by the reduction of benzoin and recrystallization twice from ethanol and once from trichlorethylene. To reduce the benzoin content the ethanolic solution is treated with a mixture of hydroxylamine hydrochloride and sodium acetate to form benzoin oxime which remains in solution. Further purification may be obtained by crystallizing from the melt or scrubbing with n-pentane and also by distillation at about 180 DEG C. and 2 mm. of mercury pressure. The stilbene is subsequently crystallized from the melt to form single crystals (see Group III).ALSO: Single crystals of substances, e.g. stilbene, tolane, naphthalene and anthracene, suitable as phosphors for measuring nuclear radiation, are grown from the melt by passing vessels containing the substance and of the shape shown vertically downward through a furnace while initiating crystallization ...

VERFAHREN ZUR HERSTELLUNG VON METALLHALTIGEM MATERIAL IN PARTIKELFORM