固定床渣油加氢脱硫脱残炭催化剂的再生条件

Regeneration Conditions for Catalysts of Fixed Bed Residue Hydrodesulfurizationand Microcarbon Residue Reduction

选取炼油厂卸载的典型废渣油加氢脱硫脱残炭催化剂(简称废剂),采用氧化预处理和再分散剂浸渍后处理对废剂进行再生,考察氧化预处理和后处理条件对废剂物化性质以及活性恢复的影响。结果表明,420℃氧化预处理后,催化剂物化性质和活性的恢复率都较高,并且在中型装置上运转800 h过程中,氧化预处理剂的相对脱硫和脱残炭活性均能达到并超过新鲜剂的85%以上。与后处理过程相比,氧化预处理过程对废剂活性恢复的影响更大,说明沉积金属所引起的不可恢复孔体积,尤其是金属钒沉积在催化剂孔口所带来的孔口堵塞,是造成废剂活性不能完全恢复的主要原因。

Effects of oxidation pretreatment and post-treatment conditions on physicochemical properties and activity recovery of typical spent residue hydrodesulfurization catalysts unloaded from refineries were studied.Experimental results indicate that both physicochemical properties and activity recovery ratio of the spent catalysts are high after oxidization at 420℃.It was found that,during 800 h pilot plant test,both relative sulfur removal ratio and microcarbon residue(MCR)reduction ratio of the oxidation pretreatment catalysts can be recovered more than 85%compared with those of fresh catalysts.Compared with post-treatment process,oxidation pretreatment has more impacts on activity recovery of the spent catalysts.Experimental results suggest that the unrecoverable pore volume caused by metal deposition,especially pore entrance blockage by vanadium deposition,is the main reason for incomplete activity recovery of the spent catalysts.