杂多化合物脱硫化氢动力学研究

Macrokinetics research on the process of hydrogen sulfide removal with hyteropoly compounds

在双搅拌、无浓度梯度气液反应器中考察了磷钼杂多化合物吸收H2 S过程的宏观动力学行为 .结果表明 ,吸收剂浓度提高 ,脱硫效果增强 ,当磷钼酸钠浓度超过 6.2 5× 1 0 - 3 mol/L后 ,单一与复配体系对H2 S的吸收速率均趋恒定 .从工业操作角度来看 ,6.2 5× 1 0 - 3 mol/L是适宜的操作浓度温度提高 ,吸收效果略有降低 ,但变化幅度不大 ,实际操作温度可选择常温 ;进气H2 S浓度提高 ,吸收效果增强 .两种脱硫体系中 ,以复配体系脱硫性能为优 .实验测得 2 5℃下反应器中H2 S的气、液相传质系数分别为 :kGH2 S=8 2 0 1× 1 0 - 1 0 kmol/(m2 ·s·Pa) ,kLH2 S=3 440× 1 0 - 4 m/s .吸收反应对磷钼酸钠及硫化氢的反应级数分别为 0 .339与 1 .0 55.

The macro kinetic behavior of hydrogen sulfide absorption with HPC (hyteropoly compounds) was investigated in a double stirred, concentration gradient less gas liquid reaction cell. Conclusions derived from this study can be summarized as follows: The absorption rate increases with the increase of the absorbent concentrations. The absorption rate reaches asymptotic in both absorbent systems of monocomponent and multicomponent when the absorbent concentration increases to above 6.25×10 -3 ?mol/L, which has been determined to be the optimum absorbent concentration of industrial interest. The absorption rate decreases slightly with the increase in operation temperature, thus, room temperature can be determined to be the favorable operation temperature. The absorption rate increases with the increase in H\-2S concentration in the inlet gas stream. Multicomponent absorbent system shows better performance of H 2S removal than that with HPC only. Mass transfer coefficients of hydrogen sulfide at 25℃ in gas phase and liquid phase were determined to be k G H\-2S =8 201×10 -10 kmol/(m 2·s·Pa) and k L H\-2S =3.440×10 -4 m/s respectively. The absorption reaction order to sodium phosphomolybdate was 0.339, and 1.055 to hydrogen sulfide.