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Return to Abstracts of Patents Return to Abstracts of Patents 500-749 Patent Abstracts652. ------. [FETTERLY, L. C.] (Shell Development Co.) Extractive Fractionation Process. United State Patent 2,588,506, Mar. 11, 1952; appl. filed Apr. 15, 1947. Serial No. 741,677; 15 claims (Cl. 260-666). Mixtures of organic compounds are treated with urea and/or thiourea to form crystalline complexes, which are separated from the raffinate and then decomposed to recover the active organic compounds present. Such decomposition or regeneration can be effected by simple or steam distillation by applying a solvent for the complex-forming agent, by heating or by applying a solvent for a particular fraction of the regenerated organic compounds. The raffinate may be fractionated by distillation, solvent extraction, or extractive fractionation with a complex-forming agent other than the one originally employed. The raffinate may be subjected to conversion processes such as isomerization, alkylation, hydrogenation, or by formation of other complexes. Gives an extensive list of organic compounds that form complexes with urea or thiourea. |