Process for separating aromatic hydrocarbons from mixtures thereof with paraffins and naphthene hydrocarbons

Abstract

Abstract AROMATIC HYDROCARBONS ARE SEPARATED FROM A MIXTURE OF LIQUID HYDROCARBONS. THE MIXTURE OF LIQUID HYDROCARBONS IS EXTRACTED IN THE LIQUID PHASE IN AN EXTRACTION ZONE WITH ETHYLENEDIAMINE HAVING A WATER CONTENT OF FROM 00% TO 200% BY WEIGHT TO FORM AN EXTRACTED PHASE AND A RAFFINATE PHASE. THE EXTRACTED PHASE COMPRISES PREDOMINANATLY AROMATIC HYDROCARBONS, SOLVENT, AND AMINOR AMOUNT OF NON-AROMATIC HYDROCARBONS. THE RAFFINATE PHASE COMPRISES PREDOMINANTLY NON-AROMATIC HYDROCARBONS. THE EXTRACTED PHASE AND THE RAFFINATE PHASE ARE SEPARATELY COLLECTED. THE NON-AROMATIC HYDROCARBONS IN SAID EXTRACTED PHASE ARE SEARATED AS OVERHEAD PRODUCT BY MEANS OF EXTRACTIVE STRIPPING OF THE EXTRACTED PHASE, THE AROMATIC HYDROCARBONS REMAINING IN THE RESIDUE OF THE EXTRACTIVE STRIPPING. THERESIDUE OF THE EXTRACTIVE STRIPPING IS AZEOTROPICALLY DISTILLED, THE AROMATIC HYDROCARBONS AND A MINOR AMOUNT OF ETHYLENEDIAMINE SOLVENT BEING COLLECTED AS THE OVERHEAD PRODUCTS. THE ETHYLENEDIAMINE SOLVENT IS COLLECTED AS THE BOTTOM PRODUCT. THE OVERHEAD PRODUCTS ARE COOLED TO SEPARATE THEM INTO AN ETYLENEDIAMINE CONTAINING PHASE AND AN AROMATIC HYDROCARBONS CONTAINING PHASE. THE AROMATIC HYDROCARBONS CONTAINING PHASE IS SCRUBBED WITH WATER TO SEPARATE OUT A DILUTE AQUEOUS ETHYLENEDIAMINE CONTAINING PHASE, AND AROMATIC HYDROCARBONS PHASE, WHICH IS THEN RECTIFIED.

Inventors

• 👤 L Lugo
• 👤 C Reni

Bibliographic Details