摘要
苯酚丙酮装置副产的α-甲基苯乙烯影响装置物耗,通常采用加氢将其转化为异丙苯作为原料循环使用,可提高装置运行效率、降低单耗,提高技术经济指标。α-甲基苯乙烯具有高度聚合性,易形成低聚物,同时含水、苯酚、碱性物等杂质,从而导致加氢催化剂失活。针对某工业装置运行中α-甲基苯乙烯加氢催化剂出现的失活现象进行剖析,并根据分析结果进行再生试验。结果表明,加氢催化剂失活原因主要是由于钠、铁杂质沉积以及苯酚、苯乙酮的聚合物覆盖所致。基于失活原因,重点比较了不同再生方案对加氢催化剂性能的影响,结果发现,水洗可以去除钠杂质,热异丙苯清洗或焙烧加氢催化剂可以除去表面的聚合物,使加氢催化剂性能完全恢复,产物中α-甲基苯乙烯残余量约500×10^-6,通过再生试验为工业α-甲基苯乙烯加氢催化剂的长周期稳定运行提供技术支撑。
Alpha-methylstyrene(AMS),a by-product of phenol-acetone plant,affects the feed consumption of the plant.AMS hydrogenation is usually used to convert AMS into cumene for recycling,which can improve the operation efficiency of the plant,reduce unit consumption and improve the economy.AMS is highly polymeric and easy to form oligomers.It also contains impurities such as water,phenol and alkaline substances,which results in deactivation of AMS hydrogenation catalyst.In this paper,the deactivation phenomenon of AMS hydrogenation catalyst in the operation of an industrial plant was analyzed,and regeneration test was carried out based on the analysis results.The results showed that the deactivation of the catalyst was mainly due to the deposition of Na and Fe impurities and the polymer coverage of phenol and acetophenone.Based on the reasons of deactivation,the effects of different regeneration methods on catalyst performance were compared.The results showed that Na impurity could be removed by water washing,surface polymer could be removed by hot isopropylbenzene cleaning or high temperature calcination,and catalyst performance could be completely restored to the level of fresh catalyst.AMS residue in the product was 500×10^-6.The regeneration test provides technical support for the long-term operation of industrial catalysts.
作者
余强
刘东东
顾国耀
刘仲能
Yu Qiang;Liu Dongdong;Gu Guoyao;Liu Zhongneng(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China)
出处
《工业催化》
CAS
2020年第2期64-69,共6页
Industrial Catalysis
关键词
催化剂工程
Α-甲基苯乙烯
加氢催化剂
失活
再生
catalyst engineering
α-methyl styrene
hydrogenation catalyst
deactivation
regeneration
