| 摘要 |
Processes for obtaining aromatic hydrocarbons from a hydrocarbon mixture a1. Mixture a1 is extractively distilled with extractive solvent a2 producing mixture bl comprising solvent a2, aromatic hydrocarbons and high boilers, and nonaromatic hydrocarbon mixture b2. Mixture b1 is distilled to aromatic hydrocarbon c1 and solvent comprising high boilers c2. Substream dl is removed from c2 and c2 is recycled to extractive distillation. Substream d1 is extracted with water producing aqueous phase e1 and organic phase e2. Aqueous phase e1 is distilled and purified solvent a2 is recovered and recycled into extractive distillation of mixture b1. Substream e2′ is removed from organic phase e2 and recycled into extractive distillation of mixture b1. The amount of organic phase e2′ is such that when d1 comprising solvent, high boilers, water and circulated stream e2′ is dispersed, aqueous extract phase e1, forms a disperse phase and organic phase e2 a continuous phase.
|
