The reasons of local liquid leakage and difficulty in overhauling of the dead trays in rectifying tower kettle for butadiene extraction were analyzed and the coupling and sealing structure of dead trays were redesigned.

• 摘要分析了造成丁二烯萃取精馏塔塔釜死塔盘局部漏液和检修拆装困难的主要原因，重新设计出由卡板、螺栓和聚四氟乙烯混编盘根组成的死塔盘的联接与密封结构。