采用宏观及微观观察、金相检验、化学成分分析、力学性能检测等方法分析了某乙苯/苯乙烯分离塔塔顶分布器发生开裂泄漏失效的原因。结果表明:由于分离塔设备工作介质中含有Cl-，在腐蚀介质和应力的共同作用下,最终导致了分布器侧板的应力腐蚀开裂。最后提出了相应的改进建议及防护措施。

Systematical analysis on the failure causes of a reflux distributor of ethylbenzene /styrene separation tower was presented by means of macro and micro morphological observations, metallographic examination, chemical compositions analysis and mechanical test. The results indicate that the presentation of Cl- within the tower together with the stress co-acted and resulted in the stress corrosion cracking of the side plate of the reflux distributor. Finally the corresponding improvements and protective measures were put forward.