含氮助剂复配柴油降凝剂的降凝效果

Pour point depressing effect of diesel pour point depressant with nitrogen-containing additives

分析了中国石化上海石化股份有限公司生产的0~#催化柴油(SPC柴油)和中国石化高桥分公司生产的0^#成品柴油(GPC柴油)的组成及其碳数分布,使用实验室合成的酸酐类胺化物(助剂A)、含芳环的叔胺(助剂B)2种含氮低分子化合物与降凝剂T 1804进行复配,通过测定柴油冷滤点,考察了助剂添加量对复配柴油降凝剂降凝效果的影响。结果表明:SPC柴油、GPC柴油的饱和烃与芳香烃总质量分数分别为90.36%,96.60%,二者碳数大于16的正构烷烃质量分数分别为12.5%,22.8%,前者含蜡量较低,对T 1804的感受性更好;在T 1804单独降凝,添加量为1 000μg/g时,SPC柴油、GPC柴油的冷滤点可分别降低6,4℃;在T 1804添加量为1 000μg/g,助剂A和助剂B的添加量分别为400,600μg/g时,复配降凝剂可使SPC柴油、GPC柴油的冷滤点分别降低12,9℃。

Composition and carbon number distribution of 0^# diesel(SPC diesel) produced by Shanghai Petrochemical Co Ltd of SINOPEC and that of 0^# refined diesel(GPC diesel) produced by Gaoqiao Branch of SINOPEC were analyzed. The two kinds of nitrogen-containing low molecular compounds of laboratory synthesized anhydride(additive A) and aromatic ring-containing tertiary amine(additive B) were compounded with pour point depressant T 1804.The effect of additives′ addition amount on performance of compounded diesel pour point depressant was investigated by measuring cold filter points of diesel. The results showed that the total mass fraction of saturated hydrocarbons and aromatic hydrocarbons of SPC diesel and GPC diesel were 90.36% and 96.60%, respectively. The mass fraction of normal paraffins with carbon numbers were greater than 16 accounts for 12.5% and 22.8%, respectively. The former contains a lower concentration of wax, which was more sensitive to T 1804. When T 1804 worked alone and the addition amount was 1 000 μg/g, the cold filter point of SPC diesel and GPC diesel could be reduced by 6 and 4 ℃.When the addition amounts of additive A and additive B were 400 and 600 μg/g, the cold filter points of SPC diesel and GPC diesel were reduced by 12 and 9 ℃ respectively.