焦化蜡油催化裂化产物氮分布的研究

催化裂化（FCC）原料正向重质化和多样化发展，如何利用催化裂化装置加工焦化蜡油（CGO）成为各炼油厂扩大FCC原料来源和挖潜增效的重要途径。与直馏蜡油（VGO）相比，CGO突出的特点心0是碱性氮化物的质量分数高。中国由于受加氢装置和氢源的限制，CGO一般不加氢而采用直接掺炼的方法，这样不仅存在CGO催化裂化转化过程中FCC催化剂碱氮中毒严重的问题，而且还存在反应后由于部分含氮化合物会直接或间接进入汽油、柴油馏分中，影响产物安定性等问题。为此，对CGO催化裂化转化过程中氮化物的研究引起了研究者的重视。

Studies on nitrogen distribution in products during catalytic cracking of coker gas oil

The nitrogen distribution in products during catalytic cracking of coker gas oil(CGO) was investigated in a laboratory two-staged riser catalytic cracking(TSRFCC) experimental unit with Kelamayi CGO as feedstock.The results showed that operation parameters,such as reaction temperature,catalyst-oil ratio and residence time,all could significantly affect the nitrogen distribution in the products.The nitrogen in the gas product and gasoline fractions decreased with the increase of reaction temperature and/or residence time,which could promote the thermal cracking.However,the nitrogen in gas product and gasoline fractions increased with the increase of catalyst-oil ratio,which could mainly enhance the catalytic cracking.On the whole,after CGO conversion,about 50% of the total nitrogen could produce nitrogen-containing coke over catalyst,and 20% of the total nitrogen remained in heavy oil,while only a little of the total nitrogen could be transfered into diesel,gasoline and gas products.