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    • 91. 发明公开
    • 파라-크실렌을 에너지 효율적으로 제조하는 방법
    • 能量生产方法
    • KR1020070121557A
    • 2007-12-27
    • KR1020070060679
    • 2007-06-20
    • 유오피 엘엘씨
    • 브레슬러레오라르손로버트방트
    • C07C15/08C07C5/22
    • C07C15/08C07C5/2708C07C2521/04C07C2529/18C07C2529/50C07C2529/70C07C2529/74C10G2300/1096C10G2300/4018C10G2400/30Y02P20/52
    • An energy-efficient process for preparing para-xylene from a feed stream having a significant amount of C9+ aromatic compounds is provided to improve the yield of a desired xylene isomer while reducing circulation loss and recyclization loss. A process for producing and recovering at least one high-purity xylene isomer from a feed stream(1) containing alkylaromatic hydrocarbons, and at least 1.0 wt% of C9 and higher heavy hydrocarbons including at least 0.5 wt% of methylethyl benzene, comprises the steps of: (a) contacting the feed stream with a heavy aromatic conversion catalyst in a heavy aromatic conversion zone(100) in a heavy aromatic conversion condition to obtain a demethylated stream having a methylethyl benzene content lower than the corresponding content in the feed stream; (b) carrying out fractional distillation of the demethylated aromatic stream to separate a light product containing C7 or lower light hydrocarbons and a heavy product containing C9 or higher hydrocarbons(202) from an intermediate stream containing C8 aromatic hydrocarbons; (c) subjecting at least a part of the intermediate stream(201) in combination with an isomerized stream to an isomer recovering step to recover at least one high-purity xylene isomer(301) and to obtain a C8-aromatic raffinate stream(302) containing non-recovered C8-aromatic isomers; and (d) contacting at least a part of the C8-aromatic raffinate stream with an isomerization catalyst in an isomerization zone under an isomerization condition to obtain an isomerized stream containing at least one xylene isomer in a concentration higher than the corresponding concentration in the C8-aromatic raffinate stream.
    • 提供了一种从具有大量C9 +芳族化合物的进料流中制备对二甲苯的节能方法,以提高所需二甲苯异构体的产率,同时减少循环损失和回收利用损失。 一种从含有烷基芳族烃的进料流(1)中制备和回收至少一种高纯度二甲苯异构体的方法,以及包含至少0.5wt%甲基乙基苯的至少1.0wt%的C9和更高重量烃包括步骤 (a)在重芳烃转化条件下在重芳香族转化区(100)中使进料流与重芳族转化催化剂接触,得到甲基乙基苯含量低于进料流中相应含量的脱甲基流; (b)对去甲基化的芳族物流进行分馏,以从含有C 8芳族烃的中间物流中分离出含有C7或更低级轻烃的轻质产物和含有C9或更高级烃(202)的重质产物; (c)将至少一部分中间物流(201)与异构化物流混合至异构体回收步骤以回收至少一种高纯度二甲苯异构体(301)并获得C8-芳族萃余液流(302) )含有未回收的C8-芳族异构体; 和(d)在异构化条件下将异氰酸酯化催化剂的至少一部分与异构化催化剂接触,得到含有至少一种浓度高于C8中相应浓度的二甲苯异构体的异构化流 芳族萃余液流。