A procedure is de cribed for the preparation of titaniulll tetrachloride of high purity. Procedures are also given for determi ning the purity of titaniulll tetrachloride by cryoscopic, spectrochemical, and infrared absorption measurements.The triple-point temper ature of pure titanium tetrachloride was found to be 249.045° K, with an estimated uncertainty of ± O.OIQo K.

The development of a process for the extraction of alumina from clay and the construction of a pilot plant are described.The process consists in (1) roasting clay at about 700 0 C, (2) digesting the roasted product with dilute hydrochloric acid, (3) filtering to separate the insoluble siliceous matter from the solution containing the aluminum and soluble impurities, such as iron and alkali salts, (4) concentrating the solution, (5) precipitating the aluminum as the hydrated chloride from the concentrated solution by adding hydrochloric acid gas, (6) removing the crystals of hydrated aluminum chloride, (7) washing the crystals to remove adhering impurities, (8) calcining the hydrated chloride to obtain alumina, and (9) recovering hydrochloric acid from the waste products at t he end of the process.The operation of the pilot plant shows that the process is feasible for the production of alumina from clay but that· the alumina costs more than that produced from bauxite by the present well-known processes.

Apparatus for using the method on quantities up to approximately 100 ml has been devised.

An interlocking process of distillation and crystallization is outlined for the separation of n-octane from petroleum. The laboratory stills used and various forms of laboratory apparatus suitable for crystallization at low temperatures are described.

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