The purification of residual components (>350 oC) of Shahdeniz condensate and the study of their structural-group composition

Abstract

The paper provides the results of the study of component, structural group analysis of the hydrocarbons and the resin of residual fraction of >350 оC condensate from Shahdeniz field. The residue is divided into the groups of saturated (naphtenic-paraffin), aromatic hydrocarbons and the resins of liquid-adsorption and eluent-replacement chromatography on the activated silica-gel. The spectral analysis, the method based on the data of elemental composition, on the average molecular weight and data of PMR were used to specify the structural group composition of separate components. The average molecular weight was defined via the cryoscopy in naphthalene. The studies justified that the saturated hydrocarbons derived from the residues are a complicated mixture of cyclic, normal and isomeric structures. The alkyl part of an average molecule is equal to 2/3. ~33 % of an average molecule falls to the share of cyclopentane and cyclohexane rings. The aromatic hydrocarbons of the residue are characterized with high content of alkyl radicals. The resins present a complicated mixture of mono- and two-block molecules, in each block of which 5.86 naphtenic, 2.11 aromatic rings with short alkyl substitutes are condensed.