催化裂化过程中硫化物的分布及转化规律

通过对催化裂化过程中影响产品硫分布的主要因素进行分析和评论 ,认为原料中硫化物类型是影响催化裂化过程中硫分布的最主要因素 ,非噻吩硫主要发生分解生成硫化氢 ,进入气体产物中 ,而噻吩类则主要发生侧链断裂 ,进入液体产物中 ,或聚合进入焦炭。同时综述了硫化物的可能转化机理 ,硫化物通过不同方式吸附在催化剂上 ,非噻吩型硫化物主要通过离子机理发生分解 ,而部分噻吩型硫化物则通过氢转移反应 ,生成非噻吩型硫化物 ,进一步发生分解反应

Sulfur Distribution and Transformation Mechanism of Sulfur Compounds in FCC

The factors, which influence the sulfur distribution in FCC products, were analyzed and discussed. The most important variable affecting sulfur distribution was the type of sulfur compound. The non-thiophenic sulfur compounds were mainly decomposed into hydrogen sulfide, while the thiophenic compounds were mainly cracked in the side chain or polymerized. The possible transfer mechanism of sulfur compound was also reviewed. The sulfur compounds were adsorbed on catalyst in different forms. The non-thiophnic sulfur compounds may be decomposed by means of carbonium ion mechanism, while a part of thiophenic compounds may be converted into non-thiophenic compounds through the reaction of hydrogen transfer, then further decomposed into hydrogen sulfide.