氢气氛下半焦有机硫的脱除动力学

KINETICS OF REMOVAL OF ORGANIC SULFUR FROM SEMI-COKE UNDER HYDROGEN ATMOSPHERE

研究了半焦颗粒在氢气氛下有机硫脱除的本征动力学行为 .实验采用微分反应器 ,研究结果表明 ,半焦颗粒的脱硫与气氛、温度和半焦硫含量有关 .通过比较粒子反应模型和随机孔模型 ,粒子反应模型仅适合于处理半焦颗粒氢气气氛脱硫的初始阶段 ,而随机孔模型符合整个脱硫过程 .

The reaction between hydrogen and organic sulfur in semi-coke at high temperature was studied. Crashed and sieved semi-coke sample (with particle size of 15 μm) was placed in 5 g batches in a 22 mm I.D. differential reactor. The release of hydrogen sulfide at run temperature and under different hydrogen atmospheres was followed using hydrogen sulfide detector. The residual was analysed for sulfur. Results showed that the desulfurization of organic sulfur in semi-coke powder could be described much better with the random pore model than with grain reaction model. Grain reaction model is only adapted to the initial stage of organic sulfur removal from semi-coke powder under hydrogen atmosphere while the random pore model is adequate for the whole stage. Experiment and theoretical study also disclosed the possibility of transformation of organic sulfur to heterocyclic organic compounds such as thiophene.