NiW/Al_2O_3催化剂上二苯并噻吩的加氢脱硫宏观动力学  

Studies on the Kinetics of the Hydrodesulfurization of Dibenzothiophene over a Commercial NiW/Al_2O_3 Catalyst

作　　者：董振国[1] 余夕志[1] 任晓乾[1] 王军[1] 王延儒[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《高校化学工程学报》2006年第3期362-367,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：以二苯并噻吩（DBT）为含硫模型化合物,在实验室中压滴流床反应装置中研究了工业NiW/Al2O3催化剂RN-10上的加氢脱硫反应的动力学规律,详细考察了工艺条件：氢分压2.4～4.5 MPa、氢油比150～700（v/v）、液时空速（WHSV）15～60 h^-1、反应温度300～380C对DBT转化率的影响.实验结果表明：提高反应温度可大大提高DBT的转化率,但反应温度达到330℃后,再提高反应温度,对DBT转化率的提升有限;在较高氢分压的条件下,DBT的转化率受氢分压的影响很小;当氢油比较小时,随着氢油比的提高,DBT转化率逐渐增加,但当氢油体积比大到一定程度（500）时,继续增大氢油比对脱硫率几乎没有影响.采用修正了的2级反应动力学模型对实验数据进行拟合,求得了二苯并噻吩加氢脱硫反应的表观活化能为75.95 kJ·mol^-1.经检验,模型计算结果与实验结果能较好地吻合.The kinetics of the hydrodesulfurization （HDS） reaction of dibenzothiophene（DBT） adopted as the model compound for S-bearing organics in middle distillates were studied over the commercial NiW/Al2O3 catalyst RN-10 in a middle-pressure trickle-bed reactor. The effect of reaction conditions on the conversion of DBT was investigated at the hydrogen pressure of 2.4-4.5 MPa, volume ratio of hydrogen/Oil of 150--700, weight hourly space velocity of 15-60 h^-1 and reaction temperature of 300 -380℃. The results show that the hydrogen pressure and volume ratio of hydrogen/Oil exert little influence on the conversion of DBT under high hydrogen pressures and volume ratios of hydrogen/Oil. At lower reaction temperatures, the conversion of DBT increases drastically with the increase of reaction temperature up to 330 ℃, while at higher reaction temperatures it increases slowly. A kinetic model of HDS was established according to the modified second-order kinetics model, and the parameters of the model were calculated. The apparent activation energy of 75.95 kJ·mol^-1 was achieved. The experimental data are in good agreement with the model ones.

关 键 词：加氢脱硫 反应动力学 二苯并噻吩 NiW/Al2O3催化剂 

分 类 号：TE624.431[石油与天然气工程—油气加工工程] O643.322[理学—物理化学]