Abstract: Phosphorus is recovered from phosphorus mud by introducing a skip of phosphorus mud into a furnace, closing the furnace and contacting the skip inside the furnace with a pool of molten lead. Phosphorus vapour is distilled from the mud and recovered.

Abstract: Novel organic polyphosphate mixtures are made by a process comprising a mixture of a plurality of polyphosphate salts of one or more primary, secondary or tertiary amines; which mixture has been obtained by a process comprising (1) forming an aqueous polyphosphoric acid solution comprising from 80 to 88% by weight of phosphorus penitoxide; (2) reacting said polyphosphoric acid solution with a primary, secondary or tertiary amine at a pH of from 4 to 12 and at a temperature of from 15 to 70.degree. C.Such mixtures are useful as builders in liquid cleaning compositions comprising surface active agents or alkali metal hydroxides or silicates with which they are more compatible in aqueous solution then are previously used polyphosphate builder materials.

Abstract: There is provided a method for preparing phosphorus compounds wherein phosphorus vapor containing P.sub.2 molecules is condensed at a temperature below the solidification point of red phosphorus and the resulting solid is then reacted with a phosphorus-reactive material. When the phosphorus-reactive material is water at an elevated temperature, phosphine is produced.