辽河渣油热转化和加氢裂化过程中生焦行为的研究

INVESTIGATION OF COKE FORMATION IN THERMAL CONVERSION AND HYDROCRACKING OF LIAOHE VACUUM RESIDUUM

考察了辽河渣油热转化和浆液床催化加氢反应过程中生焦行为。研究生焦趋势与渣油物理化学组成的关系、初期生焦机制及其对后生焦的影响。并用高倍显微镜、傅立叶变换红外光谱技术对所生焦进行表征。结果发现，随加工苛刻度的增加，反应体系中生成的焦由细分散向簇状分散过渡。初生焦对后期生焦有一定促进作用，在低压热转化过程中更为显著。生焦趋势不仅与反应条件有关而且与渣油物理化学性质相关。还与反应物系对生焦先躯物的胶溶能力密切相关。

Coke formation has long been a concern of petroleum refiners and researchers as it could lead to plug the furnace coils, transfer lines, and catalystbed, and deactivate catalysts during visbreaking and catalytic processing of residua Hence, the study on coke formation is very significant for searching for coke inhibition procedures The coke formation in the process of thermal conversion of the residuum and catalytic hydrocracking reaction in slurry bed was first investigated Then, the relationship between coke formation and physiochemical compositions of the residuum, and the effect of the initial coke formation on its propagation were studied The formed coke was characterized by using highprecision microscope and FTIR With increasing processing severity, the coke form in the bulk of reaction fluid system is changed from fine particle to coke cluster Initially formed coke seems to promote coke formation and growth of coke clusters, especially during thermal treatment under low pressure It is also found that the coke formation is quite closely related to the peptizing ability of reaction system to coke precursors