氮化物对柴油深度和超深度加氢脱硫的影响 Ⅱ 工艺条件和催化剂的影响

 采用硅胶脱除原料中氮化物，得到硫含量相同而氮含量不同的4种柴油原料。为了考察不同的催化剂、反应温度和氢分压条件下，氮化物对加氢脱硫(HDS)反应的影响，在330~370℃、2.0~6.4MPa、液时空速2.0h-1、氢/油体积比300的条件下，分别采用NiW/Al2O3和CoMo/Al2O3催化剂在小型固定床实验装置上，对4种柴油原料进行HDS反应。结果表明，氮化物对HDS反应有明显的抑制作用，但在两种催化剂上氮化物对HDS反应的抑制作用大小在不同的反应条件下的变化是不同的。当反应温度高于340℃或氢分压高于4.8MPa时，氮化物对CoMo/Al2O3 HDS活性的抑制作用大于对NiW/Al2O3上HDS活性的抑制作用；当氢分压低于3.2MPa时，氮化物对NiW/Al2O3 HDS活性的抑制作用较大。

EFFECT OF NITROGEN-CONTAINING COMPOUNDS ON DEEP AND ULTRADEEP HDS FOR DIESEL OIL Ⅱ. Effect of Processing Conditions and Catalyst

Four diesel feeds with same sulfur content and different nitrogen content were prepared by the silica gel method for removal of nitrogen-containing compounds. In order to investigate the effect of nitrogen-containing compounds on hydrodesulfurization (HDS) of diesel over different catalysts under the different reaction conditions, four diesel feeds were hydrotreated in a pilot plant at the temperature in the range of 330-370℃, the hydrogen partial pressure in the range of 2.0-6.4MPa, LHSV of 2.0h-1, V(H2)/V(Oil) of 300 and over NiW/Al2O3 and CoMo/Al2O3 catalysts, respectively. The results showed that the inhibiting effect of nitrogen-containing compounds on HDS activity of the two catalysts was obvious, but their inhibition degrees presented different changes under different reaction conditions. When the reaction temperature was higher than 340℃, or the hydrogen partial pressure was higher than 4.8MPa, the inhibiting effect of nitrogen compounds on HDS activity of CoMo/Al2O3 was more serious than that of NiW/Al2O3. When the hydrogen partial pressure was lower than 3.2MPa, the inhibiting effect of nitrogen compounds on HDS activity of NiW/Al2O3 was more serious than that of CoMo/Al2O3.