1820. KOCH, H., AND GILFERT, W. [Synthesis of Lubricating Oils From Olefins of Kogasin. I.] Brennstoff-Chem., vol. 20, 1939, pp. 413-420; Chem. Abs., vol. 34, 1940, p. 8240.

Return to Abstracts of Literature 1750-1999

Literature Abstracts

Kogasin fraction was treated with 5% (calculated on olefin content) of anhydrous AlCl₃ with vigorous stirring (1 hr. at 0°, 3 hr. warming to room temperature, 1 hr. heating to 50°, 3 hr. at 50°). The polymerization product was separated from the AlCl₃compound, treated with fuller’s earth and freed from the lower boiling constituents by distillation to 200° per 15 mm. Fractions from (I) Kogasin from water gas (1CO:1H₂) and from (II) Kogasin from synthesis gas (1CO:2H₂) were used. Fractions from (I) corresponding approximately with C₅, C₆ and C₇ hydrocarbons, respectively (olefin content 70-75%), gave about 65% (calculated on olefin content) of lubricating oil having a viscosity of 1,110-1,550 centistokes at 20° and viscosity-pole heights of 1.88-2.33; the corresponding fractions from (II) (olefin content 43-55%) gave lower yields (37-55%) of oils having a viscosity of 473-585 centistokes at 20° and viscosity-pole heights of 2.23-3.10. The lower yields from (II) were due, not to the lower olefin content of the starting material, but to a difference in constitution of the olefins. When the olefin content of (I) was reduced by partial hydrogenation lower yields of an inferior oil were produced by polymerization of the remaining olefins. The C₆ and C₇ fractions were refractionated into narrow cuts, from each of which a lubricating oil was synthesized. The properties of the products varied considerably with the boiling point of the starting material; for example, the viscosity of the oils from the C₆ fractions varied from 22,777 (from fraction 57.0°-61.0°) to 476 (from fraction 67.5°-9.0°) centistokes at 20°; the flattest viscosity-temperature curve (viscosity-pole height 1.77) was given by oil from the fraction 63.0°-3.5° (principally 1-hexene) and the steepest (viscosity-pole height 2.53) by the oil from the fraction 67.5-9.0 (2-hexene). The products from the C₇ fractions showed similar but somewhat less marked variations in properties. In neither case was there any apparent relation between the absolute viscosity of the oils and the viscosity-pole height. The mean molecular weight of the lubricating oils varied 550-1,240.