Deasphaltened oil

Two of the methods (ASTM D2007, D4124) use adsorbents to fractionate the deasphaltened oil, but the third method (ASTM D2006) advocates the use of various grades of sulfuric acid to separate the material into compound types. Caution is advised in the application of this method since the method does not work well with all feedstocks. For example, when the sulfuric acid method (ASTM D2006) is applied to the separation of heavy feedstocks, complex emulsions can be produced. 

Deasphaltened oil the fraction of petroleum after the asphaltenes have been removed. 

Maltenes that fraction of petroleum that is soluble in, for example, pentane or heptane deasphaltened oil q.v.y, also the term arbitrarily assigned to the pentane-soluble portion of petroleum that is relatively high boiling (>300°C, 760 mm) see also Petrolenes. 

Resins that portion of the maltenes iq.v.) that is adsorbed by a snrface-active material such as clay or alumina the fraction of deasphaltened oil that is insoluble in liqnid propane bnt solnble in n-heptane. 

The region of the map below the pentane-insoluble boundary corresponds to pentane-deasphalted oil from the original residuum. The saturate, aromatic, and polar fractions were separated by adsorption of the deasphalted oil over clay. The saturate fraction shows a zero carbon residue and the aromatic fraction is only a little higher at 0.7%. The coke-forming constituents in the deasphaltened oil are the polar aromatics that have a carbon residue of 15.4. The carbon residue balance shown in the insert table shows that almost all of the coke-forming mate-... 

Deasphaltened oil the fraction of petroleum after the asphaltenes have been removed using liquid hydrocarbons such as n-pentane and n-heptane. 

Finally, during the fractionation of petroleum, the metallic constituents (metalloporphyrins and nonporphyrin metal chelates) are concentrated in the asphaltene fraction. The deasphaltened oils (petrolenes and maltenes) contain smaller concentrations of porphyrins than the parent materials and usually very small concentrations of nonporphyrin metals. 

In our study the crude oil came from Shengli Oil Field (Shandong, China). The oil had an acid number of 2.98 mg KOH/g crude oil, a density of 0.9518 g/mL at 25°C, a weight percent of 32.5% for resin, and a weight percent of 4.2% for asphaltenes. In our experiments the crude oil and its fractions used were classified in following categories (1) crude oil, (2) crude oil with asphaltenes removed (deasphaltenes oil), (3) crude oil with petroleum acids removed (deacids oil), and (4) crude oil with both asphaltenes and petroleum acids removed (deasphaltenes and deacids oil). They were treated as described by Shaw and Stapp [61]. 

FIG. 9 Film capacitance of crude oil/EOR system as a function of time the first kind of mechanism of film rupture. Oil phase 30% Shengli deasphaltene oil/n-Cio aqueous phase 0.1 mol/L NaOH + 0.15 mol/L NaCl + 5 ppm demulsifier. 

The results in Table 8 show that the film lifetime in deasphaltene oil systems is shorter than that in crude oil systems at low concentration of surfactants. When the concentration of surfactant increases, the film lifetimes of the two kinds of oil become close. The results in Figs 12 and 13 show that the film lifetimes of different oils are very different for the same alkaline-demulsifier system. 

FIG. 13 Effect of surface-active components on the film lifetimes in crude oil/EOR systems. Aqueous phase 0.1 mol/L NaOH + 0.1 mol/L NaCl + demulsifier 2. Oil phase , Shengli crude oil , deacids iol A, deasphaltenes oil A, deasphaltenes and deacids oil. 

C. Becker, K. Qian, and D. H. Russell, Molecular weight distributions of asphaltenes and deasphaltened oils studied by laser desorption ionization and ion mobility mass spectrometry. Anal. Chem. 80, 8592-8597, 2008. 

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