减压蜡油掺减压渣油加氢处理(DVHT)技术研究

STUDY ON HYDROTREATING OF VGO BLENDING WITH VACUUM RESIDUE

为了拓宽FCC原料来源,提高渣油的加工深度,开展了减压蜡油掺减压渣油加氢处理(DVHT)生产催化裂化原料的中试研究。对DVHT方案和直接掺渣方案的加氢效果进行了对比,并考察了掺渣率对催化剂加氢脱杂质活性及活性稳定性的影响。结果表明,与直接掺渣方案相比,DVHT方案的加氢生成油中的硫、氮含量较低,氢含量较高,金属含量和残炭较高。对于硫含量较高的蜡油原料来说,采用DVHT方案效果更好;随着掺渣率的提高,DVHT方案的硫、氮和金属脱除率以及残炭降低率都迅速下降,其中掺渣率对加氢脱氮和加氢降残炭反应的影响最大,对加氢脱金属反应的影响次之,而对加氢脱硫反应影响最小。4 000h稳定性试验结果表明,掺渣率对催化剂活性稳定性影响较大。对于高沥青质的渣油原料,较适宜的掺渣率应控制在15%以下。

In order to widen the sources of FCC feedstock and upgrade residue, the hydrotreating process of VGO blending with vacuum residue（VR） was studied. The hydrotreating effects of DVHT scheme and directly VR blending scheme were compared and the influences of VR blending ratio on the activity and stability of catalysts were investigated. The test results showed that the hydrogenated oil of DVHT scheme possessed the characteristics of lower sulfur, nitrogen and higher hydrogen, metal, carbon residue. It was better to adopt DVHT scheme for high-sulfur VGO feedstock. With the increase of VR blending ratio, the removal rates of sulfur, nitrogen, carbon residue and metal decreased rapidly. The influences of VR blending ratio on HDN and HDCCR were greatest, and the influence on HDM took the second place, while the influence on HDS was the smallest. The stability test results showed that VR blending ratio had great influence on active stability of catalysts and the VR blending ratio lower than 15 % was appropriate for high-asphaltene residue.