Analysis of Asphaltenes and Naphthenic Acids in Nigerian Crude Oil
- Author M. N. Yaro
- Co-Author Hamza Badamasi, Aminu Dauda and Iliyasu A. Bashir
- DOI
- Country : Nigeria
- Subject : Chemistry
Keywords : Nigerian crude oil; asphaltenes; naphthenic acids; GC-mass; MS/MS experiment
Abstract
The sample (Nigerian crude oil) was collected from Kaduna Refinary and petrochemicals Company (KRPC). The asphaltenes content of the sample was isolated by precipitation and washed using dichloromethene (CH2Cl2). The co-precipitated maltenes contained in the asphaltenes were removed by soxhlet extraction using n-hexene (as solvent). The amount of asphaltenes extracted was weighed and analysed using GC-mass. Quantitative analysis of naphthenic acids was carried out by extraction using ethylenediamine solution, followed by petroleum ether. The amount of naphthenic acids extracted was also weighed, characterized using MS coupled with ESI in negative ion mode and identified using MS/MS experiment. The work showed that the amount of asphaltenes (688 mg) in Nigerian crude oil was found to be greater than the amount of naphthenic acids (227 mg); the aspheltenes component of the sample (Nigerian crude oil) was composed of C4 to C10 hydrocarbons and; the naphthemic acids were carboxylic acids.
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