Conclusions
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1.
A method is proposed for assessing selective solvents and extraction schemes and conditions for the middle fractions from sulfur and high-sulfur petroleums, based on the refractive indices of the raffinates and extracts.
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2.
The authors have selected a solvent — dimethylformamide — and suitable conditions for its use for extractive dearomatization and desulfuration of the middle fractions, and for obtaining a concentrate of organosulfur compounds and aromatic hydrocarbons (mainly alkyl benzenes).
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3.
Numerical parameters have been found for phase equilibria in the systems middle fraction of Arlan petroleum-dimethylformamide (DMFA). A triangular equilibrium diagram has been constructed and empirical equations derived for the compositions of the equilibrium phases.
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4.
The conditions for regeneration of the solvent from mixtures of raffinates and extracts with DMFA have been selected. The necessary calculating-technical indices have been obtained.
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5.
Preliminary data have been obtained for designing a rotor-disc extractor for treating the middle fractions of sulfur and high-sulfur petroleums with dimethylformamide.
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 7, pp. 1–7, July, 1970.
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Éigenson, A.S., Sokov, Y.F., Putilova, Z.D. et al. Prospects of selective treatment of the middle fractions of sulfur petroleums. II. Chem Technol Fuels Oils 6, 481–487 (1970). https://doi.org/10.1007/BF00714007
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DOI: https://doi.org/10.1007/BF00714007