Published January 2010

Distribution rules of saturated hydrocarbon in oils of Azerbaijan

F.I.Samedova

F.Z.Alieva

B.A.Huseynova

In present article are described the long-term research works on studying potential resources of the saturated hydrocarbons: alkanes, izoalkanes and cycloalkanes in oils extracted in various oil fields of Azerbaijan. The rules for concentration distribution have been determined. The individual structure of alkanes of normal structure (up to C22) and group structure by quantity of cycles in an average molecule naphthenes hydrocarbons (the naphthenous passport) of oils have been studied. Studied oils are classified from naphthenous to chemical type, contain mainly alkanes of izostructure. In low paraffinous and resinous oils, alkanes a normal structure are almost not represented, in low resinous oils their amount does not exceed 3,3 % of weights on distillate part (150-450 оС). In paraffinous oils this parameter a bit bigger and varies between 2,4 and 9,5 % of weights. The izoparaphinous hydrocarbons are prevailing among paraffin hydrocarbons of oils. The total content of aliphatic hydrocarbons in the few or even highest paraffinous oils seldomly varies between 20-28 % of weights on distillate part. The share of naphthenes in resinous oils exceeds shares alkanes izostructure by 3-4 times. In low paraffinousn and resinous oils with depth of laying up to 2400 m concentration of naphthenes hydrocarbons constitutes 33-39 % of weights on wide fraction 150-450єС. The highest content of naphthenous hydrocarbons - 39 % of weights observed in Naftalan medical oil. This type of oil is characterized by the high content of bi-, tri-, pentacyclic naphthenes, and the low contents (2,9 %) of izoparaffinous hydrocarbons. Increased content of normal alkanes is observed in the oils with depth of laying more than 2400 metres. The individual structure of concentrates normal alkanes extracted from 150-200, 200-250, 250-300 and 300-350 оС fractions has been studied. Total content of aliphatic hydrocarbons of a normal structure in 150-350 оС oil fractions have shown that alkanes with even and odd carbon number are represented in almost equal quantities, sometimes with some prevalence of odds. Average molecules of the naphthenous-paraffinous hydrocarbons extracted from oil residues (> 450 оС) consists of 2-4 rings and long poorly ramified alkyl circuits.