3896.  WELZ, ---., AND BARKOW, ---. (I. G. Farbenindustrie A. G.). [Process for Producing Aromatic, Antiknock Gasoline From Aromatic, Hard-to-Split Middle Oils.] German Patent Appl. --, OZ 14,426, filed Oct. 11, 1943. TOM Reel 20, frames 2,686-2,690, item 168.

Process is given for producing aromatic, antiknock gasoline from aromatic, hard-to-split middle oils, such as coal-tar middle oils with high naphthalene content b. 170°-310°. The middle oil is first passed over catalyst made up of the sulfides or oxides of metals of groups 2-8 (active Al₂O₃ with 10% MoO₃) on carriers of low cracking ability, such as Al₂O₃ silica gel, active C, at temperatures of 480°-550°, pressures of 100-700 atm. and H₂ partial pressure of > 50 atm. with maintenance of the aromatic content and removal of the O, S, and N-compounds and the unsaturates from the products. The gasoline obtained is separated, and the hydrocarbons boiling above the gasoline boiling range are cracked into aromatic gasoline by contact with strongly cracking artificially produced Al or Mg silicates, which contain small amounts of the oxides or sulfides of metals of groups 2-8, at temperatures of 350°-550° and pressures of 40-300 atm. The gasolines obtained in the 2 steps may be combined. The gasoline has aromatic content of 50-58% and octane No. 81-82, motor method.