673. ---------------.[DAZELEY, G. H., AND HALL, C. C.] Preparation of Lubricating Oils From Hydrocarbon-Synthesis Products. I. II. Petroleum (London), vol. 11, 1948, pp. 14-15, 26, 41-44; Chem. Abs., vol. 42, 1948, p. 3943.

673. ---------------. [DAZELEY, G. H., AND HALL, C. C.] Preparation of Lubricating Oils From Hydrocarbon-Synthesis Products. I. II. Petroleum (London), vol. 11, 1948, pp. 14-15, 26, 41-44; Chem. Abs., vol. 42, 1948, p. 3943.

Fischer-Tropsch diesel oil may be cracked to yield products containing olefins. Material obtained by thermal cracking at 600° and atmospheric pressure polymerizes in the presence of 5% AlCl₃ to give good yields of satisfactory lubricating oil. The products derived from cracking in an autoclave at 450° and over an Al-Si catalyst at 600° give poor yields of lubricating oil on polymerization. The differences in the products are said to be due to the presence of mainly straight-chain a-mono-olefins in the thermally cracked gasolines but not in those formed by other methods of cracking.