沸腾床渣油加氢工艺中氮化物转化规律的研究

STUDY ON CONVERSION LAW OF NITROGEN COMPOUNDS IN EBULLATE BED RESIDUE HYDROTREATING

以管输减压渣油作为原料油,在中型沸腾床渣油加氢试验装置上开展加氢转化试验,采用静电场轨道阱质谱分析方法,考察原料油及不同工艺条件下制得的加氢生成油中氮化物的分子结构。结果表明:管输减压渣油中的氮化物包括碱性氮化物和中性氮化物,以N1,N1O1,N2,N2O1形式存在,以N1类化合物为主;原料油在加氢转化试验过程中,碱性氮化物的碳数分布向高碳数、等效双键数(DBE)分布向低DBE方向移动,反应温度越高,趋势越明显;随着反应温度的升高,中性氮化物的DBE降低,而由于热裂化反应加剧,碳数减小。

The hydrotreating of Jiujiang pipeline oil vacuum residue was carried out in a bench scale ebullated bed reactor.The structures of nitrogen compounds in feed and hydrotreated oils under different temperatures were investigated by using the Orbitrap mass spectrometry.The results showed that the nitrogen compounds in the vacuum residue include basic nitrogen compounds and neutral nitrogen compounds,with the types including N1,N1O1,N2,N2O1,mainly N1 compounds.In the conversion of feedstock,the carbon number distribution and equivalent double bond number(DBE)of the basic nitrogen compounds moved toward higher carbon number and lower DBE;and the higher the reaction temperature,the more obvious the trend.With increase of reaction temperature,the DBE of neutral nitrogen compounds decreased,and for the intensification of thermal cracking reaction,the carbon number was reduced.