Catalytic composition for hydrotreating of hydrocarbons and method for hydrotreating

Abstract

A catalytic composition for hydrotreating of hydrocarbons in which a metallic component for hydrogenation is carried on a carrier comprising zeolite Y with aluminum and titanium inserted therein and a porous inorganic oxide, the zeolite Y having the following characteristics: (a) unit cell dimension (UD) in a range from 24.25 to 24.60 Å, (b) crystallinity of 95% or more, (c) specific surface area (SA) of 500 m2 / g or more, (d) total pore volume (PVt) of a group of pores each having a diameter of 600 Å or below in a range from 0.45 to 0.70 ml / g, (e) pore volume (PVm) of a group of pores each having a diameter in a range from 100 to 600 Å in a range from 0.10 to 0.40 ml / g, (f) pore volume (PVs) of a group of pores each having a diameter in a range from 35 to 50 Å in a range 0.03 to 0.15 ml / g, and (g) percentage of 4-coordinate aluminum atoms against total aluminum atoms in the zeolite of 60 atom % or more.

Description

TECHNICAL FIELD[0001]The present invention relates to catalytic compositions for hydrotreating of hydrocarbons and a method of hydrotreating. More specifically, this invention relates to catalytic compositions for hydrotreating hydrocarbons by using aluminum- and titanium-inserted zeolite Y, and a method for hydrotreating hydrocarbons. When used in hydrotreating of hydrocarbons such as a deasphalted oil (described as DAO hereinafter), the zeolite Y shows high hydrocracking capability for high boiling point fractions, high hydrogenating capability, excellent selectivity for middle fractions, and high desulfurizing and high denitrogenating capability. Furthermore the zeolite provides excellent effects such as a high gasoline yield and a low production rate of coke and hydrogen when the obtained uncracked bottom oil is used as a feed oil for catalytic cracking.TECHNICAL BACKGROUND[0002]Because the zeolite Y is a solid acid having acidity, the zeolite Y is used as solid acid catalyst in...

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Benefits of technology

[0010]A first object of the present invention is to solve the aforementioned problems and provide catalytic composition for hydrotreating of hydrocarbons by using aluminum- and titanium-inserted zeolite Y with specific characteristics and a method for hydrotreating thereof, in which the zeolite Y shows high hydrocracking capability for high boiling point fractions, high hydrogenating capability and high desulfurizing and high denitrogenating capability when used in hydrotreating of hydrocarbons such as DAO.

[0011]A second object of the present invention is to provide catalytic composition for hydrotreating of hydrocarbons by using aluminum- and titanium-inserted zeolite Y with specific characteristics and a method for hydrotreating thereof, in which the zeolite Y provides excellent effects such as a high gasoline yield and a low production rate of hydrogen and coke when the obtained uncracked bottom oil is used as a feed oil for catalytic cracking.

[0012]A third object of the present invention is to provide catalytic composition for hydrotreating of hydrocarbons by using aluminum- and titanium-inserted zeolite Y with specific characteristics and a method for hydrotreating thereof, in which the zeolite Y provides excellent effects such as high hydrocracking capability for high boiling point fractions, high hydrogenating capability, high desulfurizing and high denitrogenating capability, and a high yield of gasoline, kerosene or light oil fractions.

[0013]The inventors of the present invention have studied for achieving the aforementioned objects, and have found catalytic composition for hydrotreating of hydrocarbons by using aluminum- and titanium-inserted zeolite Y with specific characteristics of the improved acidic characteristics and pore structure, and the catalytic composition shows excellent effects for hydrotreating for hydrocarbon oils containing high boiling point fractions (high molecular hydrocarbons) such as deasphalted oil (DAO), and as a result the inventors have accomplished the present invention.

[0016]A third invention of the present invention relates to a method for hydrotreating of hydrocarbons having high boiling point fractions by using the catalytic composition for hydrotreating of hydrocarbons.(1) The aluminum- and titanium-inserted zeolite Y with specific characteristics included in the catalytic composition for hydrotreating of hydrocarbons in the present invention is the zeolite Y with de-aluminum processing which aluminum and titanium are inserted a frame thereof, and the aluminum and titanium inserted into the frame are supposed to be inserted into an outer surface of the frame of the zeolite Y. For that reason, the aluminum- and titanium-inserted zeolite Y has more solid acidic sites than the zeolite Y with de-aluminum processing, because more amounts of the aluminum and titanium exist in the outer surface of the frame.(2) Since the aluminum- and titanium-inserted zeolite Y has large volumes of the total pore volume (PVt) and of the pore volume of pores having a diameter in the range from 100 to 600 Å (PVm), reactants such as high molecular hydrocarbons show better diffusion to solid acidic sites.(3) For the aluminum- and titanium-inserted zeolite Y, since the aluminum and titanium inserted thereto are dispersed uniformly at the outer surface of pores, a hydrogen transfer reaction (bimolecular reaction) and an over-cracking reaction generating hydrogen and coke are hardly occurred.(4) The catalytic composition for hydrotreating of hydrocarbons of the present invention shows excellent effects for high hydrocracking capability for high boiling point fractions, high hydrogenating capability and high desulfurizing and high denitrogenating capability by using for hydrotreating of hydrocarbon oils containing high boiling point fractions such as DAO.(5) In addition, the high boiling point fractions of the obtained uncracked bottom oil are suitable for a feed oil for catalytic cracking because of a high yield of gasoline, kerosene or light oil fractions, and a low production rate of hydrogen and coke when they are used as a feed oil for catalytic cracking.

Problems solved by technology

In the method, however, there is the problem that, because the feed USY is treated with an alkaline aqueous solution with the pH in the range from 11 to 12, crystallinity of the obtained zeolite is low.

Because of the problem, when the zeolite is used for hydrotreating of hydrocarbons, an amount of a solid acid as a catalytically active point in the zeolite is small, and high cracking capability can not be obtained disadvantageously.

Because of the features as described above, when the zeolite is used for hydrotreating of hydrocarbons, the heavy hydrocarbons are not sufficiently cracked, and the selectivity for middle fractions is disadvantageously low, and there is the need for overcoming the problems as described above.

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