Method for producing hydrocarbon fractions

Abstract

A method for producing an LPG fraction, a gasoline fraction, a kerosene fraction, a gas oil fraction, monocyclic aromatic hydrocarbon and a non-aromatic naphtha fraction from hydrocracked oil includes hydrocracking hydrocarbon oil containing polycyclic aromatic hydrocarbon to convert into a light hydrocarbon fraction, and efficiently and selectively producing monocyclic aromatic hydrocarbon with higher valuable alkylbenzenes. The method for producing hydrocarbon fraction comprises subjecting hydrocarbon feedstock containing polycyclic aromatic hydrocarbon and in which the ratio of carbons constituting an aromatic ring to the total carbons in the hydrocarbon oil (the aromatic ring-constituting carbon ratio) is 35 mole % or more to catalytic cracking in the presence of hydrogen. 40% or more of a fraction with a boiling point of 215° C. or higher in the hydrocarbon feedstock is converted into a fraction with a boiling point lower than 215° C., producing hydrocracked oil containing 30 vol % or more of monocyclic aromatic hydrocarbon.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing various hydrocarbon fractions by hydrocracking specific hydrocarbon oils containing polycyclic aromatic hydrocarbons. More particularly, the present invention relates to a method for producing hydrocarbon fractions by obtaining a hydrocracked oil which selectively contains a large amount of monocyclic aromatic hydrocarbons and then efficiently producing light hydrocarbon fractions such as an LPG fraction, a gasoline fraction, a kerosene fraction, a gas oil fraction, a non-aromatic naphtha fraction, and a monocyclic aromatic hydrocarbon.BACKGROUND ART[0002]In recent years, the demand of petroleum products tends to lighten, particularly, petrochemical feeds represented by BTX (benzene, toluene, and xylene), is increasing more and more. Furthermore, in addition to BTX, aromatic hydrocarbons are widely used as a gasoline blending stock due to the generally high octane value. A fluid catalytic cracking process c...

AI Technical Summary

Benefits of technology

[0028]According to the method for producing hydrocarbon fractions of the present invention, high-boiling-point hydrocarbon fractions are converted into low-boiling-point hydrocarbon fractions, and also high value-added alkylbenzenes (monocyclic aromatic hydrocarbons) represented by BTX are efficiently produced by using a hydrocarbon oil containing a large amount of polycyclic aromatic hydrocarbons as a feed and contacting the hydrocarbon oil with an optimal hydrocracking catalyst in the presence of hydrogen, while avoiding catalyst poisoning. In addition, since a hydrocracking catalyst which is most suitable for the hydrocracking and has a specified composition and specified properties suitably balanced in hydrocracking activity and hydrogenation activity is used, gas generation by excessive cracking can be controlled and a decrease in the activity by coking due to insufficiency of hydrogenation activity can be suppressed. In addition to the capability of producing alkylbenzenes at a high efficiency and a high selectivity, an LPG fraction, a gasoline fraction, a kerosene fraction, a gas oil fraction, a non-aromatic naphtha fraction, and a monocyclic aromatic hydrocarbons can be obtained by separating the resulting hydrocracked oil using an appropriate known method. These fractions can be effectively used as a low-sulfur-content LPG blending stock, a high-octane-number low-sulfur-content gasoline blending stock, a low-sulfur-content kerosene blending stock, a high-cetane-number low-sulfur-content gas oil blending stock, a low-sulfur-content non-aromatic naphtha stock and a petrochemical feed and contribute to a reduction of environmental load.

Problems solved by technology

However, the feed for the catalytic reforming process is limited to naphtha fractions having the same boiling point range, whereby restrained quantitatively.

Therefore, it is difficult to blend a large amount of these fractions.

However, the proposed method is still just a technique for producing gas oil and kerosene.

This is not such a technology that reduces the molecular weight of the polycyclic aromatic compounds and converts the compounds even into a feed for petrochemical.

This is not a method for preferentially producing BTX.

This is thus not a method for selectively producing monocyclic aromatic hydrocarbons.