ZnNi/HZSM-5下凝析油的芳构化

Investigation of Condensate Aromatization Over ZnNi/HZSM-5

伴随着天然气的开采,我国将有大量的天然气凝析油资源,如何有效利用凝析油资源则成了研究的现实问题。实验考察了ZnNi/HZSM-5催化剂的凝析油芳构化,并用气、液相色谱仪对原料和反应产品进行了分析。实验证明在空速为1.5h-1和高径比(催化剂床层高度和直径之比,简称高径比即H/D)为6的条件下,凝析油芳构化在560℃达最佳值。由实验结果可知,凝析油芳构化属于高温反应,凝析油烃类分子的活化同时由裂解和脱氢开始,所用催化剂中过渡金属Zn和Ni的协同作用强化了凝析油的直接脱氢芳构化,提高了凝析油的芳构化性能,达到了较好的收率和选择性。同时由于凝析油原料的复杂性,其芳构化历程很难用单一的反应路线加以表现,因此从抽象的角度分析了凝析油的芳构化途径。

With the exploitation of natural gas, our country will possess plenty of condensate resource. Then how to make good use of it becomes a realistic problem. Aromatization of condensate over ZnNi/HZSM-5 was investigated and feed stocks and products were analyzed by using gas chromatograph and liquid chromatograph in the experiment. The experiment indicates that with the condition of space velocity of 1.5 h^(-1), ratio of height to diameter of 6(the ratio of height to diameter of catalyst bed is named as briefly H/D) and temperature of 560 ℃, the aromatization of condensate reaches optimal value. From the experiment, we also know that the aromatization of condensate belongs to high temperature reaction and the activation of hydrocarbon molecules begins from cracking and dehydrogenation simultaneously. During this process, the synergistic reaction of Zn and Ni strengthens the direct dehydrogenation aromatization of condensate, improves aromatization performance and enhances aromatic yields and selectivity. Meanwhile, due to the complexity of the condensate material, the reaction mechanism of aromatization is difficult to be described with singular route, so the path of condensate aromatization was analyzed from abstract point of view.