公开(公告)号：EP1109761A4

公开(公告)日：2001-11-07

申请号：EP99942143

申请日：1999-08-12

申请人： EXXONMOBIL OIL CORP

发明人： ABICHANDANI JEEVAN SAHIB ,  BECK JEFFREY SCOTT ,  BROWN STEPHEN HAROLD ,  CIMINI RONALD JOSEPH ,  KWOK SELMA ,  JOHNSON IVY DAWN ,  LIGURAS DIMITRIS KONSTANTINE ,  STERN DAVID LAWRENCE

IPC分类号： C07C4/18 ,  C07C5/27 ,  C07C15/08

CPC分类号： C07C15/08 ,  C07C4/18 ,  C07C5/2702 ,  C07C2523/36 ,  C07C2523/42 ,  C07C2523/44 ,  C07C2523/46 ,  C07C2529/00 ,  C07C2529/80 ,  C07C15/067

摘要： A process is described for increasing the efficiency of para-xylene production using a two stage isomerization sequence. In the first stage of the process, a C9+ aromatics feedstock is subjected to ethylbenzene conversion and xylene isomerization. Non-C¿8? aromatics are removed from the effluent, which is then processed in a second stage of the process to remove para-xylene and isomerize the para-xylene depleted effluent. The effluent from the second stage isomerization unit is then recycled into the inlet of the second stage of the process and a slip stream from the para-xylene separator is recycled to the feedstock and to the effluent of the ethylbenzene conversion unit. In this way, the production of para-xylene is maximized. In a preferred embodiment, toluene is co-fed into the feedstock to minimize the loss of xylenes during the ethylbenzene conversion reaction.

摘要翻译： 描述了使用两阶段异构化序列提高对二甲苯生产效率的方法。 在该方法的第一阶段，C9 +芳族化合物原料经受乙苯转化和二甲苯异构化。 非C¿8？ 从流出物中除去芳烃，然后在该过程的第二阶段中处理以去除对二甲苯并异构化对二甲苯耗尽的流出物。 然后将来自第二阶段异构化单元的流出物再循环到该方法的第二阶段的入口中，并将来自对二甲苯分离器的滑流再循环到原料和乙苯转化单元的流出物中。 以这种方式，对二甲苯的生产被最大化。 在优选实施方案中，将甲苯共同加入原料中以使乙苯转化反应过程中二甲苯的损失最小化。