656. ------. [FETTERLY, L. C.] (Shell Development Co.). Thiourea-Hydrocarbon Complexes and Process for Preparing Same. United States Patent 2,499,820, Mar. 7, 1950; appl. filed Feb. 21, 1947. Serial No. 730,182; 16 claims (Cl. 260-666). Chem. Abs.,

Patent Abstracts

656. ------. [FETTERLY, L. C.] (Shell Development Co.). Thiourea-Hydrocarbon Complexes and Process for Preparing Same. United States Patent 2,499,820, Mar. 7, 1950; appl. filed Feb. 21, 1947. Serial No. 730,182; 16 claims (Cl. 260-666). Chem. Abs., vol. 44, 1950, p. 5090.

It has been found that isoparaffins, naphthenes, iso-olefins, and cyclo-olefins readily form crystalline complexes with thiourea. The formation of these compounds makes possible the separation, concentration, and purification of specific petroleum hydrocarbons from impurities. A list of 164 hydrocarbons that form complexes with thiourea is presented. Describes preparation of many thiourea-hydrocarbon complexes.