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RECENT INVENTIONS B y C. L. PARKER, Solicitor of Chemical Patents, McGill Building, Washington, D. C.
Separating Mixed Liquefied Gases. A. C. Morrison, March 18, 1913. U. S. Pat. 1,056,043. T h e process is designed for the production of gaseous oxygen and nitrogen from liquid air, and is based on the facts t h a t oxygen is a paramagnetic element and t h a t its magnetic susceptibility is higher t h a n t h a t of nitrogen. The process consists in placing the liquid air or other mixture of liquefied gases within a srrong magnetic field, and then alloir-ing the liquid to become heated t o a temperature slightly above the boiling point of the nitrogen, or other more volatile and less magnetic component, whereupon the nitrogen distils off,thc oxygen, or other component, remaining by reason both of its relative involatility and of the tractive effect of the magnetic field. Sulfite-Waste Explosive. F. Raschig, March 18, 1913. U. S. Pat. 1,056,366. This is a mixture of ammonium nitrate with dried sulfite waste constituents. Refining Natural Gas Gasolene. W. 0. Snelling, March 25, 1913. U. S. Pat. 1,056,845. By this continuous process. the liquid containing several \-olatile ingredients is heated in a series of condensers to a temperature sufficient t o completely volatilize all of the ingredients, the vapors or gases being kept under
Gold Pigment. J. W. Hasburg, April I, 1913. U. S. Pat. 1,057,422. X hydrosid, carbonate or tricarhonate of an alkali metal is added t o a solution of gold chlorid and the gold prccipitated by means of a metallic salt. The precipitate is n-ashed and a n acid added to dissolve the precipitated basic metal oxitl from the gold. Nitrate of Lime and Dicalcium Phosphate in a Single Operation. S. Peacock, April I, 1913. U. S. Pat. 1,057,876. Finely divided phosphate rock containing tricalcium phosphatc and lime is immersed in water and gases containing nitric acid 1)lown through the mixture until the frce lime and one-third of thc combined calcium in the tricalcium phosphatc are converted into calcium nitrate. The resulting calcium nitrate and dicalcium phosphate are suitable for plant food. Production of Zinc and the i Like. A. B. Pescatore, Apr. I, 1913. U. S. Pat. 1,057,878. Zinc ore and a reducing body are kf fed into a shaft or like blast furnace and a slon. current of air 2supplied in such quantity as t o reduce the ore but without permitting the oxygen t o rcaeh the mrm reducing zone. The reduction zone is maintained a t high temperature 1)y electric heating. New Form of Synthetic Indigo. A. Schmidt and A. Steindorff, April I, 1913. U. S. Patent 1,057,886. Indol derivatives, preferably leuco-indigo salts. are subjected t o oxidation in the presence of a phenol. Treatment of Copper Ores Bearing Precious Metals. J. C. Clancy, April I, 1913. U. S. Patent 1,057,936. The ores arc subjected to the action of a cyanid solution containing a soluble cyanamid and the solution electrolyzed for the recovery of the copper. ' Process of Making Caoutchouc Substances. C. Harries, April 8, 1913. U. S. Patent 1,058,056. The patentee has discovered that the alkali and alkaline earth metals are capahle of converting hydrocarbons of the butadiene series, such as butadiene and its homologous and substitution products, into new caoutchouc substances. I n the process 5 parts of sodium wire are pressed into 1000 parts of butadiene. The container is closed and allowed Lo stand for a week or two. The sodium is then acted upon by alcohol or water and the caoutchouc substance formed rolled into sheets. The product is a n elastic whitish substance soluble in benzine. Baking Powder. E. Jacoby, April 15, 1913. U. S. Patent 1,058,980. The composition contains an oxygen-yielding percarbonate.
Malleable Iron Direct from Ore. A. R. Lindblad. April 15, 1913. U. S. Patent 1,058,991. A shaft furnace is charged with a mixture of the ore and reducing material. Gases taken from the shaft are heated outside the furnace and introduced into the shaft t o reduce the ore. The resulting mass is then passed without cooling or contact with air into a n electric melting furnace. Concentrating Sulfite Waste Liquor. C. Ellis, April I, 1913. U. S. Pat. 1,057,416. Air is blown through the sulfite liquor Low-Carbon Nickel Alloys. E. A. Byrnes, April 2 2 , 1913. t o remove a portion of the free sulfurous acid. The residue is U. S. Patent 1,059,709. High-carbon ferrochromium is reacted neutralized t o alkaline reaction, concentrated under reduced upon with nickel oxid by feeding the niekel oxid into a bath atmospheric pressure and freed from insoluble products by of calcium aluminate slag supported on the molten ferrochrohydrolysis. niium. pressure in excess of two atmospheres. This pressure is so high t h a t the boiling points of the several ingredients are widely separated : each ingredient or fraction containing several ingredients is thus separately condensed, a t a temperature slightly below its boiling point.
