REMOVAL OF AROMATIC HYDROCARBONS FROM REFORMING NAPHTHA. COMBINED EXTRACTION – EXTRACTIVE–AZEOTROPIC DISTILLATION PROCESS

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Abstract

Separation of C6–C9 aromatic hydrocarbons from naphtha cut reformate by extraction with sulfolane followed by extractive/azeotropic distillation of the extract phase with sulfolane and ethanol. For mass ratios of sulfolane to feedstock of 1.6:1 and 0.28:1 in the stages of extraction and extractive–azeotropic distillation and a ratio of ethanol to feedstock of 0.032:1, raffinate was obtained with a yield of 65 wt. %, which satisfies the long–term environmental requirements for gasoline and benzene, toluene, and C8 and C9 aromatic hydrocarbons with a yield of 89, 77, 69, and 24 wt. %.

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