Hydrorefining Catalyst, Method For Producing Same, And Process For Hydrorefining Hydrocarbon Oil

CATEGORY: HYDROREFINING
PATENT
Hydrorefining Catalyst, Method For Producing Same, And Process For Hydrorefining Hydrocarbon Oil
European Patent Application EP2412438
Inventors:
Seki, Hiroyuki (c/o JX Nippon Oil & Energy Corporation6-3 Otemachi 2-chomeNaka-ku, Chiyoda-ku Tokyo 1008162, JP)
Fukui, Yoshiaki (c/o JX NIPPON OIL & Energy Corporation6-3 Otemachi 2-chome, Chiyoda-ku TOKYO 1008162, JP)
Yoshida, Masanori (c/o JX NIPPON OIL & Energy Corporation6-3 Otemachi 2-chome, Chiyoda-ku Tokyo 1008162, JP)
Application Number:
EP20100755626
Publication Date:
02/01/2012
Assignee:
JX Nippon Oil & Energy Corporation (6-3, Otemachi 2-chome, Chiyoda-ku Tokyo 100-8162, JP)
Abstract:
A hydrotreating catalyst that exhibits excellent levels of both desulfurization activity and denitrification activity. The hydrotreating catalyst is prepared by supporting molybdenum, cobalt and nickel on a carrier comprising aluminum, silicon, phosphorus and boron, and then performing a presulfiding treatment, and has an average stacking number for molybdenum sulfide slab that is greater than 1.0 but not more than 1.9. Also, a process for producing a hydrotreating catalyst that enables a hydrotreating catalyst having excellent levels of both desulfurization activity and denitrification activity to be produced with comparative ease. The process includes a first step of mixing an acidic aluminum salt aqueous solution and a basic aluminum salt aqueous solution in the presence of phosphate ions and silicate ions to achieve a pH of 6.5 to 9.5, thereby obtaining a hydrate, a second step of adding boron to the hydrate to prepare a carrier-forming material, a third step of molding and calcining the carrier-forming material to obtain a carrier, a fourth step of supporting molybdenum, cobalt and nickel on the carrier to obtain a catalyst precursor, and a fifth step of performing a presulfiding treatment by bringing the catalyst precursor into contact with a mixed gas containing hydrogen and hydrogen sulfide under conditions including a pressure of not less than 2.0 MPa and a maximum temperature of 240 to 380°C.
Description:

TECHNICAL FIELD

The present invention relates to a hydrotreating catalyst for removing a sulfur content and a nitrogen content from a hydrocarbon oil in the presence of hydrogen, and a process for producing the hydrotreating catalyst. Further, the invention also relates to a hydrotreating process for removing a sulfur content and a nitrogen content from a hydrocarbon oil in the presence of hydrogen.
BACKGROUND ART

In recent years, there have been growing demands for further reductions in the sulfur content in liquid fuels. In response to these demands, fuel oil producers have already investigated various processes for producing clean fuels. In particular, the adoption of a limit of not more than 10 ppm for the sulfur content of gasoline has lead to fuel oil producers introducing various countermeasures such as improved catalysts and expanded facilities.
 Generally, the main base for gasoline is a cracked gasoline produced in a fluid catalytic cracker (FCC). Accordingly, in order to reduce the sulfur content in gasoline, reducing the sulfur content within this cracked gasoline is very important.
 The sulfur content within a cracked gasoline is dependent on the sulfur content within the vacuum gas oil that functions as the FCC feedstock, and it is well known that a higher sulfur content within the vacuum gas oil results in a higher sulfur content within the cracked gasoline. Accordingly, in order to produce a clean gasoline having a low sulfur content, the sulfur content must first be removed from the vacuum gas oil that functions as the FCC feedstock.
 In a hydrotreating process used for desulfurizing a vacuum gas oil (namely, a FCC pretreatment), a treatment is usually performed in which the vacuum gas oil is subjected to hydrotreating in a fixed bed reactor packed with a hydrotreating catalyst, under a stream of hydrogen gas and under conditions of high temperature and high pressure. A catalyst prepared by supporting an activated metal such as molybdenum or cobalt on a carrier such as alumina is widely used as the hydrotreating catalyst.
 It is known that the desulfurization activity during hydrotreating is affected by the type of carrier used, and the type and amount of activated metal used. For example,
 •Non-Patent Document 1 discloses the effects of the carrier (alumina or silica) and the activated metal (molybdenum or a mixture of molybdenum and cobalt). Further
•Non-Patent Document 2 describes the desulfurization activity of catalysts that use zirconia or titania as the carrier, and nickel or tungsten as the activated metal.
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