公开(公告)号：US3725257A

公开(公告)日：1973-04-03

申请号：US3725257D

申请日：1971-05-04

申请人： IT RESINE SPA SOC

发明人： CAVENAGHI C ,  DI FIORE L ,  BARILLI F ,  CALCAGNO B

IPC分类号： B01D11/04 ,  C07C7/10 ,  C10G21/00 ,  C10G21/20

CPC分类号： C10G21/00 ,  B01D11/0488 ,  C07C7/10 ,  Y10S585/932 ,  C07C15/00

摘要： 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 AT A TEMPERATURE FROM ABOUT 40*C. TO AOUT 80*C. WITH ETHYLENEDIAINE SOLVENT HAVING A WATER CONTENT OF FROM 00% TO 20% BY WEIGHT TO FORM AN EXTRACTED PHASE AND A RAFFINATE PHASE. THE EXTRACTED PHASE COMPRISES PREDOMINANTLY AROMATIC HYDROCARBONS, SOLVENT AND A MINOR AMOUNT OF NON-AROMATIC HYDROCARBONS. THE RAFFINATE PHASE COMPRISES PREDOMINANTLY NON-AROMATIC HYDROCARBONS. THE EXTRACTED PHASE AND THE RAFFINATE PHASE ARE SEPARATELY COLLECTED. THE EXTRACTED PHASE IS COLLED TO A TEMPERATURE AT LEAST 300*C. LOWER THAN THE TEMPERATURE OF THE EXTRACTION STEP AND THEN SEPARATED INTO A HEAVIER SOLVENT CONTAINING PHASE AND ALIGHTER HYDROCARONS CONTAINING PHASE. THE NON-AROMATIC HYDROCARBONS IN THE LIGHTER HYDROCARBONS CONTAINING PHASE ARE SEPARATED A OVERHEAD PRODUCT BY MEANS OF EXTRACTIVE STRIPPING AT ATMOSPHERIC PRESSURE. THE AROMATIC HYDROCARBONS REMAIN IN THE RESIDUE OF THE EXTRACTIVE STRIPPING WHICH IS THEN SCRUBBED WITH WATER TO THEREBY OBTAIN AN AROMATIC HYDROCARBONS PHASE AND AN AQUEOUS ETHYLENEDIAMINE CONTAINING PHASE. THE AROMATIC HYDROCARBONS PHASE IS THEN RECTIFIED.