The Ability of Anilines Extracted from Iraqi Petrol on Preventing Deposits Formation in Crude Kerosene

Abstract

The oxidative degradation products formed under both the prolonged storage and thermal stress are a problem in the utilization of Kerosene fuels. Researchers are directed in developing fuel stabilizers that are increasingly cost-effective, do not degrade the performance of fuel and are environmentally acceptable. Our interest in anilines extracted from Iraqi crude oil has led to evidence that they are excellent antioxidant stabilizers for tetraline at elevated temperatures. The results of stability experiments for thermal and oxidative degradation of two crude Kerosene fuel samples obtained from al-Dora refinery with 0.20% sulfur contents (sample A), and from Kirkuk refinery with 0.25% sulfur contents (sample B) were evaluated in these stability tests in comparison with other well-known stabilizers. The samples were treated as follows: 1.They subjected to long period of storage (90 days) without any additives. 2. They exposed to thermal aging at elevated temperature (393K) without any additives for 3 hours. Chemical factors preventing formation of color, insoluble sediments and gums were studied by modeling generally accepted degradation mechanisms. In this paper we will report our mechanistic investigation into the chemical details of the stabilization and effect of chemical structure of extracted N,N-P-methyl phenyl acetone (MPA) and N, N-phenyl acetone (PA)on the activity of deposits formation in kerosene in a comparison with 2, 6-di-t-butyl-4-methyl phenol (Unol), and tertiary alkyl primary aniline (TAPA) with 9, and 12 carbon atoms.