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2.2.1. Definition of group composition neftej and neftepodobnyhsistem


Oil shot (or other petrosimilar system) dilute with 40 multiple (on volume basis) with quantity of hexane and carefully agitate. For full sedimentation of asphaltenes a solution leave to stand in a dark place within 24 hours.
RUSSIAN SOSUDARSTSENM> CHLISTEHA
Deposit of asphaltenes filter off, transfer it to a socket from a filter paper and seat in a Soxhlet apparatus for washing out of asphaltenes from soekstragirovannyh oils and resins.
Washing of asphaltenes make hexane before full disappearance of colouring of following solvent. The asphaltenes washed from okkljudirovannyh of components, wash away from a socket benzol. A benzene solution filtrate through the paper filter, then solvent distil off and lead up asphaltenes to constant weight in a vacuum-DRYING CHAMBER (at temperature 80).
Filtrate after washing out of asphaltenes from resins and oils attach to a stock solution received at filtering of asphaltenes. Received deasfaltizat if it is necessary, lead up to initial weight dehexanizing. For the further division into components delete a part hexane and so that dilution of a product by solvent corresponded approximately to the relation 1:3.
Then start chromatographic fractionation of oils and resins. In the adsorptive in a column seat 60 g of silica gel (the mass relation nefthilikagel should be approximately 1:40). Silica gel compact on-stukivaniem on a column a wooden rod, and then permeate it is
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The dignity taken in number of 200-250 ml for removal of wetting heat of adsorbent.
After solvent completely will imbide in silica gel, in a column fill in an investigated sample deasfaltenizirovannoj oil. Sko-rost product input in a sorbent should not exceed 100-120 ml/H. It dos-tigaetsja regulation (by means of the crane) speeds of selection of solvent by which silica gel is permeated.
Desorption start in 16 h after the initial product completely will imbide in silica gel. For desorption of oils in a column (through a separatory funnel) fill in a benzol and hexane mix (in volume soot - carrying 15:85) in number of 750 ml, and it is simultaneous from below columns begin selection eljuenta with a speed of 175-200 ml/H.
Resins are eluated at first by benzol in number of 200 ml, and then spirtobenzolnoj (1:1) a mix in number of 200-250 ml. Accordingly Would receive benzene and spirtobenzol nye resins (SBS).
Solvents distil off from oil components on a water bath, in a nitrogen current. Resins translate in tarirovannye glasses and dry to constant weight in a vacuum-DRYING CHAMBER at 70 With [109].
The maintenance of asphaltenes and resins (X) in mas. % find under the formula:
H = 100 X t/a, where t - weight of asphaltenes or resins, g; and - a shot of oil,
Percentage of oils () in oil define on a difference:
M = 100 % - (asphaltenes + resins) Divergence % between two parallel definitions should not exceed the following values specified in tab. 2.1.
Table 2.1
Admissible divergences between two parallel definitions of the maintenance of asphaltenes and resins the Component the Maintenance, mas. % Admissible divergences from smaller result, otn. % Asphaltenes to 0,5 more than 0,5 20 10 Resins to 0,5 more than 0,5 10 5
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A source: Tagirzjanov, Marseilles Ilgisovich. ASPHALTENES VANADIJSODERZHASHCHIH neftej (on an example of oil objects of deposits of Tatarstan) the Dissertation on competition of a scientific degree of a Cand.Chem.Sci. Kazan - 2003. 2003

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