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热词
    • 3. 发明授权
    • Process for the separation of isoprene
    • 分离异丙酚的方法
    • US3851010A
    • 1974-11-26
    • US32723873
    • 1973-01-26
    • SNAM PROGETTI
    • RESCALLI CGINNASI AREBORA P
    • B01D3/14C07C1/00C07C7/00C07C7/08C07C11/18C07C67/00
    • C07C7/005C07C7/08C07C11/18
    • D R A W I N G
      1. PROCESS RECOVEING ISOPRENE OF POLYMERIZATION GRADE FROM A MIXTURE OF C4 AND C5 HYDROCARBON INCUDING ISOPRENE, COMPRISED OF THE FOLLOWING STEPS; (A) RATIFICATION WHEREIN C4 HYDROCARBONS, LOW BOILING ACETYLENIC COMPOUNDS, 70% TO 90% OF ISOPENTANE ARE WITHDRAWN AS OVERHEAD, AND DIMERIZATION AND POLYMERIZATION PRODUCTS 30% TO 60% OF THE HIGH BOILING HYDROCARBON PRESENT IN THE FEED ARE WITHDRAWN AS BOTTOM PRODUCT, AND THE STREAM CONTAINING ISOPRENE IS WITHDRAWN IN VAPOR PHASE FROM A PLATE OF THE EXHAUST SECTION OF A RECTIFIER; (B) A FIRST EXTRACTIVE DISTILLATION, UTILIZING REFLUX AND SOLVENT, SELECTED FROM THE GROUP CONSISTING OF NFORMYLMORPHOLINE, MORPHOLINE AND MIXTURES OF SAID COMPOUNDS WITH EACH OTHER AND WITH WATER, OBTAINED BY SUBJECTING TO FLASH EVAPORATION THE BOTTOM STREAM OF A SECOND EXTRACTIVE DISTILLATION STEP, WHEREIN MONOCYCLOPENTADIENE, HIGH BOILING ACETYLENIC COMPOUNDS AND 40% TO 70% OF PENTADIENES PRESENTS IN SAID STREAM ARE WITHDRAWN AS BOTTOM PRODUCT AND A STREAM CONTAINING RAW ISOPRENE IS WITHDRAWN AS OVERHEAD WITH OLEFINES, CYCLOPENTENE, AND C5 SATURATED HYDROCARBONS; (C) STRIPPING THE BOTTOM STREAM OF THE FIRST EXTRACTIVE DISTILLATION STEP BY SEPARATING THE SOLVENT FROM MOMOCYCLOPENTADIENE AND OTHER HYDROCARBONS, WHEREIN THE SOLVENT IS RECOVERED AS BOTTOM PRODUCT AND MONOCYCLOPENTADIENE AND OTHER HYDROCARBONS SOLUBLE IN THE SOLVENT ARE DISCHARGED AS OVERHEAD; (D) RECTIFICATION OF THE OVERHEAD HYDROCARBON STREAM FROM THE STRIPPING STEP (C) WHEREIN MONOCYCLOPENTADIENE, THE HIGH BOILING ACETYLENIC COMPOUNDS AND 40% TO 70% BASED ON THE FEEDSTOCK OF THE DIENE COMPOUNDS ARE WITHDRAWN AS BOTTOM PRODUCT AND ISOPRENE CONTAINED IN THE STREAM COMING FROM STRIPPING STEP (C) IS DISCHARGED AS OVERHEAD PRODUCT AND SENT TO THE RECTIFICATION COLUMN OF STEP (A); (E) SECOND EXTRACTIVE DISTILLATION OF THE RAW ISOPRENE STREAM OBTAIN FROM THE FRIST EXTRACTIVE DISTILLATION STEP (B) WHEREIN SAID STREAM IS FED IN VAPOR PHASE AND THE C5 SATURATED AND OLEFINIC COMPOUNDS ARE WITHDRAWN AS OVERHEAD, THE SOLVENT NECESSARY THEREFOR BEING WITHDRAWN FROM THE BOTTOM OF THE STRIPPING COLUMN OF STEP (C); (F) FLASH EVAPORATION OF THE STREAMS DISCHARGED AS BOTTOM PRODUCT IN THE EXTRACTIVE DISTILLATION STEP (E), THE LIQUID PHASE BEING RECYCLED TO THE TOP OF THE FIRST EXTRACTIVE COLUMN FOR SUPPLYING SAID COLUMN BOTH WITH THE EXTRACTIVE SOLVENT AND THE HYDROCARBON STREAM NECESSARY FOR THE REFLUX, THE VAPOR PHASE CONSTITUTED BY ISOPRENE ESSENTIALLY IMPURE FOR CYCLOPENTENE AND CYCLOPENTANE BEING SENT TO A FURTHER RECTIFICATION STEP; (G) RECTIFICATION ELMINATING AS BOTTOM PRODUCT THE STILL PRESENT HEAVY COMPOUNDS, CYCLOPENTENE, CYCLOPENTANE AND THE REMAINING PENTADIENES WITHDRAWING AS OVERHEAD A STREAM OF ISOPRENE CONTAINING TACES OF LOW BOILING COMPOUNDS, WHICH STREAM IS RECYCLED TO THE RECTIFICATION COLUMN OF STEP (A) WITHDRAWING IN LIQUID PHASE FROM A PLATE OF THE UPPER SECTION OF THE RECTIFICATION COLUMN POLYMERIZATION GRADE ISOPRENE.