The failure of previous protection method used for water chlorination tower in producing isophthalonitrile was analyzed and a new protection method was proposed. The protection mechanism in discussed.

• 分析了间苯二腈生产装置中水氯化塔设备原防护方案失效的原因,并就此提出了新的防护方案,对防护机理和效果进行了综合探讨。