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PATENTS
59.
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[ATWELL, H. V.] (The Texas Co.). Process
for upgrading Diesel Fuel. United
States Patent 2,562,980. Aug. 7, 1951: appl. Filed June 5, 1948. Serial No.
31,389; 7 claims (Cl. 260-450). Olefin-containing diesel oil obtained by catalytic conversion of CO and H2 at 550°-700° F. and 200-500 p. s. i. pressure is improved in a quality by contacting it with CO and H2 at 100°-350° F. and 100-5,000 p. s. i. in presence of an Fe-group catalyst, thus converting the olefinic constituents to oxygenated compounds. These are separated from the diesel fraction by solvent extraction with MeOH, extractive distillation, or adsorption on silica gel. Removal of the O2-containing compounds produces a desel oil of high quality: a typical diesel fraction before treatment by the above method has a cetane number of 48, and after treatment 65.4. Hydrogenation of the O2-containing compounds with tail gas from the synthesis operation as the source of H2 and Cu chromite as the catalyst converts the O2-containing compounds to high-molecular weight alcohols which are commercially valuable.
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