轻质解吸剂吸附分离制对二甲苯装置的设计

DESIGN OF PARA-XYLENE COMPLEX USING LD PAREX TECHNOLOGY

从物料平衡、装置规模、操作条件、装置流程、能耗等方面介绍了世界首套轻质解吸剂吸附分离工艺制对二甲苯装置的设计情况,在流程、能耗等方面将其与采用传统吸附分离工艺技术的装置进行了对比。与传统工艺相比,该工艺的热集成中心由二甲苯塔改为抽余液塔,取消解吸剂再蒸馏塔;异构化反应采用热高压分离器加冷低压分离器流程,异构化分馏和二甲苯分馏流程优化整合,取消脱庚烷塔;新工艺、新吸附剂放宽吸附分离进料要求以及减小解吸剂循环量;单位对二甲苯产品能耗从7 964 MJ/t降至6 706 MJ/t,降低15.8%,体现了新工艺的技术先进性。

The design of the first para-xylene complex using LD PAREX technology in the world was introduced in terms of material balance,unit capacity,operating conditions,process flow,and energy consumption and was compared with the traditional process.In the design,the heat integration center was raffinate column instead of xylene column and the desorbent rerun column was deleted;the flow scheme of hot high pressure separator plus cold low pressure separator was used for isomerization sector,the isomerization distillation and xylene separation sector was integrated optimally and the dehep tanizer was canceled.The energy consumption per ton para-xylene was reduced from 7 964 MJ/t to 6 706 MJ/t,about 15.8%,due to relaxation of feed contaminant limit for adsorption separation unit and reduction of desorbent circulation quantity,which proves the LD PAREX technology advancement.