Study on Thermal Cracking of Kuwaiti Heavy Oil (Vacuum Residue) and Its SARA Fractions by NMR Spectroscopy

• DOI: 10.1021/ef401476j
• Publication Date: 2014-06-13T05:21:39Z
• Authors: André Hauser; Faisal AlHumaidan; Hassan Al-Rabiah; Mamun Absi Halabi
• Keywords: 0211 other engineering and technologies; 02 engineering and technology

Three vacuum residual oils (VR) derived from Ratawi Burgan (RB), Lower Fars (LF), and Eocene (EOC) crude oils were subjected to thermal cracking in a pilot plant, which simulates the Eureka process, to produce cracked distillate petroleum products and residual pitch. The cracking reaction was performed at 430 °C for 50 min. The chemical composition of the produced cracked petroleum products and byproduct pitch was studied to determine its relationship to the variations in the properties of the feedstock. Saturates, aromatics, resins and asphaltenes (SARA) analysis of the vacuum residues, cracked oils, and pitch show that the residues and pitch consist mainly of aromatic hydrocarbons (VR: 94 wt %; pitch: 99 wt %), while the oils themselves contain about 42 wt % saturated hydrocarbons (oilRB: 46 wt %; oilEOC: 44 wt %; oilLF: 36 wt %). 1H and 13C NMR revealed that the VRs consist predominantly of alkyl aromatics with di-, tri- (aromatics, resins), and polyaromatic rings (asphaltenes) that thermally decompose...