Process for desulfurization of hydrocarbons
Номер патента: EP3545052A1
Опубликовано: 02-10-2019
Автор(ы): Christian Ejersbo STREBEL, George Hoekstra
Принадлежит: Haldor Topsoe AS
Опубликовано: 02-10-2019
Автор(ы): Christian Ejersbo STREBEL, George Hoekstra
Принадлежит: Haldor Topsoe AS
Реферат: The present disclosure relates to a process for hydrodesulfurizing an olefinic naphtha feedstock while retaining a substantial amount of the olefins, which feedstock has a T 95 boiling point below 250°C boils and contains at least 50 ppmw of organically bound sulfur and from 5% to 60% olefins, said process comprising (a) selective diolefin hydrogenation, under reaction conditions involving a temperature from 100°C to 200°C, a pressure of 5 bar to 40 bar or 50 bar, and a gas to oil ratio of 2 Nm3/m3 or 4 Nm 3 /m 3 to 5 Nm 3 /m 3 , 10 Nm 3 /m 3 or 25 Nm 3 /m 3 to convert at least 50% or 90 % of the diolefins to paraffins or mono-olefins providing a pre-treated feedstock, (b) hydrodesulfurizing the pre-treated feedstock in a sulfur removal stage in the presence of hydrogen and a hydrodesulfurization catalyst, at hydrodesulfurization reaction conditions including a temperature from 200°C to 350°C, a pressure of 5 bar to 40 bar or 50 bar, and gas to oil ratio of 750 Nm 3 /m 3 , 1000 Nm 3 /m 3 , 1100 Nm 3 /m 3 or 1200 Nm 3 /m 3 to 1500 Nm 3 /m 3 , 2000 Nm 3 /m 3 or 2500 Nm 3 /m 3 , to convert at least 50 % of the organically bound sulfur to hydrogen sulfide and to produce a desulfurized product stream containing from 0 ppmw, 0.1 ppmw or 1 ppmw to 5 ppmw, 8 ppmw, 10 ppmw or 50 ppmw organically bound sulfur, with the associated benefit of such a process providing a lower octane loss, compared to a process with similar conversion of organic sulfur with a lower gas to oil ratio. In addition the pre-treatment at low gas to oil ratio, will reduce the risk of polymerization of diolefins in the process. In addition olefins and mercaptans will react to convert low-boiling mercaptans to higher boiling sulfides, which has the potential effect of providing a light naphtha fraction comprising olefins and little or no sulfur and a heavy naphtha fraction comprising few olefins and the majority of sulfur.
Method for desulfurizing hydrocarbons
Номер патента: RU2753042C2. Автор: Джордж ХЕКСТРА,Кристиан Айерсбо СТРЕБЕЛ. Владелец: ХАЛЬДОР ТОПСЕЭ А/С. Дата публикации: 2021-08-11.