Abstract
This study includes analysis of different crude oil stock for various field Iraqi oil by gas chromatography instrument, using simulated distillation technique for determining the initial and final boiling point distribution and specified compound distillation information (normal paraffins) (Recovery W/W) for (nC5 – nC44), ASTM-D5307 becomes the analytical method. This method need tow samples; the first one spiked with internal standard and the second without internal standard. This analysis for quantitative and qualitative oil characterization which is often useful for evaluating the range of hydrocarbons in crude oil using Simulated Distillation. The study was performed using:
 
 Quarterly analysis of SIMDIS GC Distillation for three field (East Baghdad, Badra, Amara)
 Comparison of analyzes of SIMDIS GC Distillation with Different API (light, intermediate, heavy) with Initial boiling point (IBP).
 Finding experimental relationship between API and Initial boiling point (IBP):
 
 
 The result of this study shows that the boiling point increase as the number of carbon is increase, the values of n-Pentane (nC5) to n- Tetratetracontane (nC44) (w/w) changes from winter and summer (difference in temperatures), Positive correlation between C6 and C5 with API, where their percentages increase with increasing API for crude oil and C6 and C5 are lower in summer than in winter due to the evaporation of light components of the samples in summer. Initial boiling point increase as the API is decrease that mean in crude oil have heavy component increases and light component decrease (inverse relationship).
Highlights
This study includes analysis of different crude oil stock for various field Iraqi oil by gas chromatography instrument, using simulated distillation technique for determining the initial and final boiling point distribution and specified compound distillation information (Recovery W/W) for, ASTM-D5307 becomes the analytical method
- Finding experimental relationship between API and Initial boiling point (IBP): The result of this study shows that the boiling point increase as the number of carbon is increase, the values of n-Pentane to n- Tetratetracontane (w/w) changes from winter and summer, Positive correlation between C6 and C5 with API, where their percentages increase with increasing API for crude oil and C6 and C5 are lower in summer than in winter due to the evaporation of light components of the samples in summer
Crude oil varies widely in appearance and viscosity from field to field, characterization and source identification of oils from various fields is necessary. One of such ways of doing this is by analyzing the hydrocarbon fractions, Gas Chromatography analysis for quantitative and qualitative oil characterization which is often used for evaluating the range of hydrocarbons in crude oil or rock extract. [1, 2] Gas Chromatography requires analyzing entire oil for hydrocarbon range in a gas chromatograph while certain hydrocarbon ratios were employed in evaluating such things as maturity, source, biodegradation and evaporative fractionation
Summary
Crude oil sample can be analysis by injecting a small portion of the sample into a gas chromatograph. - Alkanes (paraffins) - Alkenes (olefins), - Aromatics Hydrocarbon products such as gasoline, diesel fuel, and asphalts are all derived from crude oil by a variety of refining and distillation processes. The middle boiling range compounds are used in differing proportions to create products such as kerosene, diesel, and heating oil. These products predominantly contain C10 to C24 alkanes, and polynuclear aromatics with little to no olefins. 1.2 Simulated Distillation (SD) by Gas Chromatography The methods (ASTM D-5307) the distribution of crude oil and determining the boiling points used Simulated Distillation is a GC technique method .This data very useful to refinery engineers in determining the process and to monitor the refining process to ensure the products produced are as expected. A correlation was reported between the boiling points and the percentages of the sample. [5, 6] The methods (ASTM D-5307) of simulated distillation for crude oil and petroleum fractions by gas chromatography shown in Table (1) below, according to the device (Shimadzu Simulated Distillation Gas Chromatograph GC-2014) a suitable method is (ASTM D5307) used for this study
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