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计算了在纤维催化剂喷淋床中进行裂解汽油双烯加氢时的传质阻力。使实验中测得的一级反应速度常数与从模型计算的相等,求得双烯加氢时的模数k及有效因子η。h值很小,η值均接近于1。通过对一根纤维作质量衡算,并应用实验测定的反应速度,分别导得双烯及氢的膜扩散是否能对反应构成显著阻力的判别式。计算表明,在反应速度相当高时,双烯及氢的内外扩散均未构成显著阻力。除h及η外,还得到围绕纤维的液膜厚度以及双烯和氢气的传质系数。
Mass transfer resistance was calculated for hydrogenation of pyrolytic diolefins in a fiber catalyst bed. The first-order reaction rate constant measured in the experiment is equal to that calculated from the model. The modulus k and the effective factor η are obtained when the diene is hydrogenated. h value is very small, η values are close to 1. By determining the mass of a fiber and using the experimentally determined reaction rate, we can obtain the discriminant of whether the membrane diffusion of diolefin and hydrogen can form significant resistance to the reaction, respectively. Calculations show that there is no significant resistance to the internal and external diffusion of diolefins and hydrogen at very high reaction rates. In addition to h and η, the thickness of the liquid film surrounding the fibers and the mass transfer coefficient of the dienes and hydrogen are also obtained.