773. GARNER, P. J., GOLDSBROUGH, L. N., AND BUYERS, T. B. (Shell Development Co.) Separation of Straight-Chain Hydrocarbons by means of Urea Complexes. United States Patent 2,518,677. Aug. 15, 1950: appl. filed May 10, 1949. Serial No. 92,518, in Grea

Patent Abstracts

773. GARNER, P. J., GOLDSBROUGH, L. N., AND BUYERS, T. B. (Shell Development Co.) Separation of Straight-Chain Hydrocarbons by means of Urea Complexes. United States Patent 2,518,677. Aug. 15, 1950: appl. filed May 10, 1949. Serial No. 92,518, in Great Britain July 7, 1948: 16 claims (Cl 260-676). Chem. Abs., vol. 45. 1951. p. 3406.

Straight-chain hydrocarbons are separated from admixture with branched-chain and cyclic hydrocarbons by bringing the mixture into contact with an aqueous urea solution to selectivity from crystalline molecular complexes of urea with the straight-chain hydrocarbons.

A small amount of wetting agent such as 0.2-0.6 gm. per 1. of the urea solution of an alkali-metal alkyl sulfate, for example, Na 2-decyl sulfate and a neutral water-soluble electrolyte (10-60 gm. per 1. alkaline-earth, alkali-metal, or ammonium salt) are added to the reaction mixture to promote association of the complex crystals with the aqueous solution and aid in depressing emulsification.

GARRETT, R. C. See abs. 3640.