Selective solvent for extractive distillation

Claims

1. A selective solvent for extractive rectification for the extraction of aromatic hydrocarbons from gasoline fractions of reforming and pyrolysis processes by the extractive rectification method, characterized in that it is a mixed solvent, each component of which has a dipole moment of at least 4.5 D, a ratio of the dipole moment to the molecular weight in the range of 0.03-0.04 D / a.m.u., and is one of the homologues of the class of cyclic sulfones, wherein the first component of the solvent has higher selectivity and lower dissolving power for alkanes compared to the second component of the solvent, and the ratio between the first and second components of the solvent is in the range of (90-10)-(10-90) wt.%.

2. The solvent according to paragraph 1, characterized in that sulfolane, characterized by complete solubility in benzene, is used as the first component of the solvent.

3. The solvent according to claim 1, characterized in that 3-methylsulfolane is used as the second component of the solvent.

4. The solvent according to claim 1, characterized in that the mixed solvent is hydrated.

5. The solvent according to paragraph 4, characterized in that the water content in the hydrated solvent is 0.1-5.0 wt.%.