1991. KROEPELIN, H., OPITZ, W., AND FREISS, W. [Sulfochlorination of Kogasin in the Dark.] Erdöl u. Kohle, vol. 2, 1949, p. 498-500; Fuel Abs., vol. 7, 1950, abs. 3133.

Return to Abstracts of Literature 1750-1999

Literature Abstracts

Tests on the reaction of Kogasin (b. 225°-305°) with Cl₂ and SO₂ were made using Kogasin of 3 grades of purity, technical, refined (olefin-free), and a super-refined material (olefin-free vacuum-distilled over Na in N₂). Using the refined material, chlorination was the main reaction at 25°-38° and sulfochlorination at 38°-68° (temperature measured in reaction vessel). The best ratio between chlorination and sulfochlorination was at 68°. Technical Kogasin reacted similarly but somewhat more energetically. Using the highly refined Kogasin, reaction with Cl₂+SO₂ could not be obtained. In the course of analyses of the Kogasins, marked sensitivity of the refined olefin-free material to O₂ was observed in the temperature range 100°-130°. Tests with the most highly refined material to which 0.5% of chain initiators (dodecylene-1, benzoyl peroxide) had been added showed strong combination with Cl₂ and SO₂ at 71°-77°, the products containing approximately 16% Cl and 9% S. Inhibitors of the reaction (alcohols, pyridine) also were tested. In the case of pyridine the inhibitory action is due to a pyridine-chlorine compounds. Smooth sulfochlorination of petroleum fractions from crude oil was not obtained, presumably owing to the presence of natural inhibitors. The experiments confirm that, even in the dark, sulfochlorination is a chain reaction.