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    • 1. 发明授权
    • Process for separating aromatics by extractive distillation and a composite solvent used therein
    • 通过萃取蒸馏分离芳烃的方法和其中使用的复合溶剂
    • US07078580B2
    • 2006-07-18
    • US10184751
    • 2002-06-28
    • Longsheng TianWencheng TangMing ZhaoYunming ZhangZhifeng BianHuixia SunShijin Wu
    • Longsheng TianWencheng TangMing ZhaoYunming ZhangZhifeng BianHuixia SunShijin Wu
    • C10C7/10C10C7/17
    • B01D3/40C10G7/08C10G21/27
    • This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8–C11 aromatics having different number of carbon atoms, the content of which is 3–39 wt %, and the number of carbon atoms of the lowest aromatic in the solutizer should be greater than that of the highest aromatic in the aromatics to be separated. When the solutizer is selected from any one of C8–C11 aromatics, the composite solvent contains 0.01–10.0 wt % of the modifier; when the solutizer is selected from mixtures of any two of C8–C11 aromatics having different number of carbon atoms, the composite solvent contains 0–10.0 wt % of the modifier. Said main solvent and modifier are independently selected from sulfolane derivatives, N-formyl morpholine, and N-methyl pyrrolidone, provided that the acidity and basicity of the modifier are opposite to those of the main solvent. When the composite solvent is used to recover aromatics by extractive distillation, it is possible to moderate the operation conditions of solvent recovery, increase the yield of aromatics, and make the separated aromatics to be neutral.
    • 本申请涉及通过萃取蒸馏分离芳族化合物的复合溶剂,其包括主要溶剂,溶剂和改性剂。 所述溶剂选自具有不同碳原子数的C 8 -C 11 -C 11芳族化合物的任何一种或其混合物,其含量为3-39重量% ,并且溶剂中最低芳族化合物的碳原子数应大于待分离芳烃中最高芳族化合物的碳原子数。 当溶剂选自C 8 -C 12芳族化合物中的任何一种时,复合溶剂含有0.01-10.0重量%的改性剂; 当溶剂选自具有不同碳原子数的C 2 -C 11 -C 11芳族化合物的任何两种的混合物时,复合溶剂含有0-10.0重量%的改性剂 。 所述主要溶剂和改性剂独立地选自环丁砜衍生物,N-甲酰基吗啉和N-甲基吡咯烷酮,条件是改性剂的酸度和碱度与主要溶剂的酸度和碱度相反。 当通过萃取蒸馏将复合溶剂用于回收芳族化合物时,可以调节溶剂回收的操作条件,提高芳族化合物的产率,并使分离的芳族化合物成为中性。