1819. ---------------. [KOCH, H., AND BILLIG, R.] [Preparation of Lubricants From Solid Paraffin Hydrocarbons of the Fischer-Tropsch Atmospheric Pressure Synthesis by Way of Their Olefinic Cracked Distillates.] Brennstoff-Chem., vol. 21, 1940, pp. 169-177; Chem. Abs., vol. 35, 1941, p. 3803.

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Literature Abstracts

Method used by Sullivan and others, with natural solid and paraffin-wax fractions of petroleum, has been applied to fractional extracts from Kogasin paraffin and from synthetic ceresin. Repeated passes gave 40-50% yields of nearly pure olefins boiling >250°, with 35-45% cracked gas containing 60% of unsaturated hydrocarbons. The distillate boiling >250° was converted to lubricants with 5% anhydrous AlCl₃ in a 7-hr. reaction to 60°, with 65-75% yields of oils of good viscosity-temperature relations, poles of 1.57-1.83 abs. viscosity of 240-820 centistokes⁵⁰ or 32°-108° E. Yield of a diesel oil was 5-14%. However, close fractions obtained from the cracked distillates of the ceresins produced lubricants whose viscosity behavior depended upon the boiling ranges of the corresponding fractions. Viscosity poles decreased with increasing boiling range, for example, for the 230°-250° fraction, the lubricant pole was 1.31. Lubricants from 5 of these fractions were hydrogenated with Ni catalyst at 250°-260° at 80 atm. subsequently, and complete physical examination generally showed no appreciable change in viscosity-temperature relation. However, viscosity increased around 10% without great change in average molecular weight n_D averaged 0.0004 lower, solid point increased 1°-2°, and aniline point increased 4°-5°. Ring analyses showed 1.51-2.88 naphthalene rings per mol. and on the basis of molecular weight were parallel to viscosity poles. 11 refs.