351. CENTR D?TUDES ET DE RECHERCHES TECHNIQUES DU P?TROLE, DES CARBURANTS ET DES LUBRIFIANTS, AND BADISHE ANALIN- UNED SODA-FABRIK (I. G. Farbenindustrie A. G. “In Anflösung”). [Cracking of Hydrocarbons.] French Patent 976,166. Mar. 14, 1951. Chem. A

Patent Abstracts

351. CENTR DẺTUDES ET DE RECHERCHES TECHNIQUES DU PẺTROLE, DES CARBURANTS ET DES LUBRIFIANTS, AND BADISHE ANALIN- UNED SODA-FABRIK (I. G. Farbenindustrie A. G. “In Anflösung”). [Cracking of Hydrocarbons.] French Patent 976,166. Mar. 14, 1951. Chem. Abs., vol. 47, 1953, p. 24755.

Aliphatic hydrocarbons containing >5 C atoms in the molecule are passed at >450º over a catalyst consisting of an active AL₂O₃ prepared by precipitation from an aluminate with acid and peptizing the precipitate by HNO₃, or by precipitation by alkali from an Al salt at >80º. The product of cracking is a mixture of aromatic hydrocarbons, C₂H₄, C₂H₆ and coke. As alphatic compounds petroleum products obtained by hydrogenation or cracking of mineral oils or by reaction of CO and H may be used. The catalyst may be supported in SiO₂ gel or an Al silicate. The aliphatic vapors are passed at a rate of 0.1-2 1. per hr. per 1. of catalyst. The products may be separated by a selective solvent, for example, SO₂ alone or mixed with propane, phenol, a ketonic acid, or furfuryl alcohol, while unconverted hydrocarbons may be recycled.