延迟焦化装置放空塔塔顶冷凝水中有机污染物的分布特征

采用全二维气相色谱飞行时间质谱法（GC×GC-TOFMS）对延迟焦化装置放空塔塔顶冷凝水中的有机污染物分布特征进行分析，共鉴别出340种烃类化合物、144种含氮有机物、69种含硫有机物及60种含氧有机物，分别占有机污染物的质量分数为60.20%，11.77%，15.42%，8.09%。其中，烃类化合物中芳烃占比最大；含氮有机物主要是芳杂环化合物和芳香胺类；含硫有机物主要为含硫杂环化合物，且以苯并噻吩类、苯并萘并噻吩类、二苯并萘并噻吩类、菲并噻吩类、萘并噻吩类等含硫多环芳烃为主；含氧有机物以酚类化合物为主。芳烃、含氮芳杂环化合物、含硫杂环化合物、酚类化合物等有机污染物的分子结构稳定、毒性大、可生化性差，是放空塔塔顶冷凝水有机负荷消减的关键。

DISTRIBUTION CHARACTERISTICS OF ORGANIC POLLUTANTS IN CONDENSATE WATER FROM BLOWDOWN TOWER OF DELAYED COKING UNIT

The distribution characteristics of organic pollutants in condensate water from blow blowdown tower of delayed coking unit were studied by using comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC×GC-TOFMS). 340 kinds of hydrocarbons, 144 kinds of nitrogenous organic compounds, 69 kinds of organic-sulfur compounds, and 60 kinds of oxygen-containing organic compounds have been identified, which accounted for 60.20%, 11.77%, 15.42% and 8.09%, respectively. Among them, aromatic hydrocarbons (especially polycyclic aromatic hydrocarbons, such as pyrenes, benzanthracenes, naphthalenes and phenanthrenes) account for the largest proportion; nitrogenous organic compounds are mainly aromatic heterocyclic structures (pyridines, quinolines, indoles, carbazoles, pyrimidines, etc.) and aromatic amines; organosulfur compounds are mainly sulfur-containing heterocyclic structures and the sulfur-containing polycyclic aromatic hydrocarbons (benzothiophenes, benzonaphthothiophenes, dibenzothiophenes, phenanthrothiophene, naphthothiophenes, etc.) predominate; and phenols are the main oxygen-containing organic compounds. The organic pollutants (aromatic hydrocarbons, nitrogenous aromatic heterocyclic compounds, sulfur-containing heterocyclic compounds and phenols) have stable molecular structure, high toxicity and poor biodegradability.