Upgrading of Visbreaker Naphtha

摘要

experiments were carried out in a trickle bed pilot reactor charged with Albermarie KF 752-3Q Co-Mo catalyst under thefollowing conditions:reactor inlet temperature(RIT)of290°C;total reactor pressure of 3.5 MPa;liquid hourly space velocity(LHSV)in the range 1-2 hr~(-1);treating gas/oil ratio of 300 Nm3/m3.The treating gas purity was 99 mole.% hydrogen.It was found that under the conditions stud-ied the degree of hydrogenation of feedstock olefins was about 98% and reactor AT showed a linear relationship with the feedstock olefins content.It was estimated that the metallurgical material limitation of 420°C in a commercial hydrotreating reactor could be reached at 90% of VBN in the feedstock mixture and 290°C reactor inlet temperature.The hydrogenate obtained by hydrotreatment of light VBN(Final Boiling Point of 122°C)is suitable as a feedstock for py-rolysis,since it has a low content of aromatics and naphthenes(the characteris-tic index of 2A+Namounts to 33.2).The hydrogenate obtained by hydrotreatment of full range VBN(Final Boiling Point of 205°C)is suitable as afeedstockfor reforming since its characteristic index of 2A+N of 57.6 is close to that of SRN(2A+N=55.8),which is a typi-cal reformer feedstock.The highest characteristic index of 2A+N=74 was displayed by MDHN.This work investigates thefeasibility of hydrotreatment of mixtures of straight run naphtha(SRN),visbreaker naphtha(VBN)and naphtha from a middle distillate hydrotreating unit(MDHN).Hydrotreating