The Preparation of Aromatics from Petroleum Hydrocarbons (3)

Abstract

The relative reactivities of various normal paraffins in aromatization over a cerium-potassium-chromia-alumina catalyst and the distribution of resultant aromatics were investigated.The yields of aromatic compounds from C6, C7, C8, C9, C10 and C12-paraffins were 32.8, 55.0, 62.3, 81.3, 72.7, and 75.7 mole% respectively. The reactivities of hydrocarbons increased appreciably with the number of carbon atoms from C6 to C9, but those of C10 and C12 became lower than that of C9.On the contrary, the degree of carbonaceous deposition on the catalyst decreased gradually as the number of carbon atoms increased from C6 to C9, but increased surprisingly with C10 and C12. While there have not been reported detailed studies on aromatization products from C9, C10 and C12-paraffins, this report discusses on the distribution of these products by means of gas chromatography. In the reactions of C9, C10 and C12, aromatics with condensed rings in the products increased considerably with the number of carbon atoms.