2659. ------. [PIER, M., AND DONATH, E.] (I. G. Farbenindustrie A. G.). Lubricating Oil. United States Patent 2,063,623, Dec. 8, 1936. Chem. Abs., vol. 31, 1937, p. 852.

Paraffin wax composed of materials of a molecular weight of at least 250 is heated under pressure (suitably about 40-140 atm.) and in the presence of a dehydrogenating and condensing catalyst such as molybdic acid, C and ZnCl₂ to a temperature of about 400° to produce a reaction product containing a substantial proportion of constituents b. > 200° in vacuo and of only slightly less H content than the initial material.