Improved method for the preparation of a crystalline composition of violet titanium trichloride. (Machine-translation by Google Translate, not legally binding)

摘要

Improved method for the preparation of a crystal composition of titanium violet trichloride, essentially in the delta form, by reduction of titanium tetrachloride with metallic aluminum in the stoichiometric ratio of 3 moles of titanium tetrachloride per gram atom of metallic aluminum, in absence of any diluent and, if possible, in the presence of catalysts such as aluminum trichloride, hydrochloric acid or alkyl halides in the ball mill, a method characterized by the procedure being carried out using balls of a diameter chosen in the range of 14 to 27 mm and with operating conditions of the ball mill that are chosen so that the value of the ratio ** (See formula) ** where Ks is the degree of filling of the balls in kg/liter, Kt is the degree of filling of titanium tetrachloride in Kg/liter, D is the diameter of the ball mill in centimeters, d is the diameter of the balls in centimeters yn is the rotation speed of the mill in rpm it is comprised between 2.5 x 106 and 8.5 x 106, and in that the reduction is carried out at a temperature of 100-250º C up to a conversion greater than 85% and is completed at a temperature lower than 100º C, preferably at room temperature. (Machine-translation by Google Translate, not legally binding)