摘要
从酸性水汽提装置的三级分凝器中采出的冷凝液中含有大量不溶于浓氨水的有机相(油相),其碱性氮含量高达5.94×10~4μg·g^(-1)。将油相进行蒸馏切割后再分别进行气相色谱-质谱联用(GC-MS)定性分析。分析结果表明,三级分凝液中的碱性有机物多为吡啶、单取代和多取代甲基吡啶、苯胺、单取代和多取代苯胺;而大多数酸性有机物为二取代和三取代甲基苯酚。此外,还检测到含量较多的2,4,7-三甲基-萘啶和少量的吲哚、喹啉和吖啶类化合物,这些化合物极有可能是吡啶和苯胺类化合物通过Skraup反应与不饱和醛酮缩合反应生成的。同时,三级分凝液返回到原料水罐中容易导致非烃化合物在汽提系统内部积累,进而发生缩合反应产生积垢并损坏氨压机等,应当对三级分凝液单独处理。
There was a large number of organic compounds that were insoluble in liquid ammonia in the three-stage dephlegmator of stripping unit. The content of basic nitrogen can reach up to 5.94× 10 4 μg· g-1. The organic phase was cut to six distillate fractions via engler distillation, and the compositions of fractions were analyzed via gas chromatography-mass spectrometry, respectively. The analytical results show that the basic organic compounds are pyridine, mono-substituted and poly-substituted methyl pyridine, aniline, mono-substituted and poly-substituted methyl aniline. The acidic compounds are mainly di-substituted and tri-substituted methyl phenols. In addition, large amount of 2,4,7-trimethyl-naphthyri- dine and a small amount of indole, quinoline and acridine compounds are also detected in the fractions. The generation of these compounds may be attributed to the Skraup reaction between pyridine, aniline compounds and unsaturated aldehyde/ketones. Liquid in the three-stage dephlegator can＇t be suitable to return to the sour water tank, because the non-hydrocarbon compounds can create fouling contaminant in the stripping unit by some reactions and have some adverse impacts on the ammonia compressor.
作者
陈飞洋
李飞
姜恒
赵杉林
Chen Feiyang;Li Fei;Jiang Heng;Zhao Shanlin(School of Chemistry and Materials Science,Liaoning Shihua University,Liaoning Fushun 113001,China)
出处
《化学工业与工程》
CAS
CSCD
2018年第6期67-71,共5页
Chemical Industry and Engineering
关键词
酸性水
汽提
三级分凝器
苯酚
苯胺
sour water
stripping
three-stage dephlegmator
phenol
aniline
