2625.     ---------------.  [PETERS, K., AND WINZER, K.]  [Preparation of Light Naphtha From Kogasin II by Cracking.]  Brennstoff-Chem., vol. 17, 1936, pp. 301-306; Ges. Abhandl. Kenntnis Kohle, vol. 12, 1937, pp. 506-516; Coal Carbonisation, vol. 2, 1936, p. 205; Chem. Abs., vol. 31, 1937, p. 1992.

        Cracking at 465°-570° and pressures to 100 atm. has been studied at throughputs up to 150 cc. oil/min.  Cracking was assisted by H₃PO₄ catalyst.  The proportion of gaseous to liquid products varied between 1:2 and 1:6 up to 530° and at 560° attained 1:1, as compared with cracking at atmospheric pressure in a Pythagoras tube up to 740° where proportions ranged 2:1-6:1.  Pressure cracking yielded unsaturated compounds in smaller amount, the naphtha obtained, however, being highly unsaturated.  Treatment with C₂H₄ in the presence of H₃PO₄ catalyst did not improve the octane number, although C₂H₄ did.