2959. ----- [RUHRCHEMIE, A. G.] [Lubricating Oils.] French Patent 47,814, July 31, 1937; appl. filed Nov. 24, 1936. Chem. Zentralb. 1938, I, p. 237; Chem. Abs., vol. 32, 1938, p. 4774.

Olefin-containing hydrocarbons, such as, those from benzine synthesis by cracking the product, are condensed with AlCl₃. The Catalyst is renewed from time to time by introducing about 10% of fresh catalyst.

See also French Patent 809,226 (abs.3204) and British Patent 473,935 (abs. 2956).