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VOLUMETRIC BEHAVIOR OF MIXTURES OF DIFFERENT OIL STOCKS

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Author(s): Jabir Shanshool | Naseer Habobi | Shymaa Kareem

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 53;
Issue: 3;
Start page: 223;
Date: 2011;
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Keywords: Excess volume | Blending | non-ideal mixtures | mixed petroleum fractions.

ABSTRACT
Blending of oil stocks with hydrocarbons form non-ideal mixtures, for which excess volumes can bepositive or negative depending to the nature of species. Gas oil mixed with nine petroleum fractions orindividual hydrocarbons consisting of aromatics, and paraffinic nature in addition to an alcohol anda ketone. The systems have been subjected to density measurements at two temperatures (25 and35°C).Binary mixtures of gas oil with the paraffinic spikes, light naphtha, heavy naphtha, kerosene and nhexadecaneproduce negative excess volume values. This maximum shrinkage occurs for the lowestboiling spike. Where n-hexadecane results in very small negative excess volume and seem to formnearly ideal volumes with gas oil.The spiking of gas oil with, toluene, xylene, MEK or reduced crude show positive excess volume,indicating that such spikes are affected as “structure breaking” materials leading to expansion. Thespiked gas oil with iso-octanol shows an expansion. The excess volume values increases as the massfraction of iso-octanol increased. Methyl ethyl ketone with some base oil stocks of different boilingrange show positive excess volume. This expansion is greatest for lowest boiling stock.
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