Method for producing gasoline and low pour point oil by catalyst grading technology

Abstract

The invention discloses a method for producing gasoline and diesel oil with a low condensation point by a catalyst grading technology. The method comprises the following steps: a) mixing a heavy oil raw material with hydrogen, and allowing the mixture to pass through a reaction zone containing a hydrorefining catalyst bed layer to perform a restrictive hydrorefining reaction; b) allowing a reaction effluent obtained in the step a) to pass through a reaction zone containing a graded wax oil hydro-conversion catalyst bed layer under hydro-conversion process conditions, and allowing a reaction effluent to enter a flash tank for separation so as to obtain a gas phase and a liquid phase; c) performing subsequent separation, steam stripping and fractionation on the gas phase in the step b) to obtain converted gasoline; and d) allowing the liquid phase in the step b) to pass through a reaction zone containing a wax oil hydrocracking catalyst bed layer to perform a hydrocracking / isomerizationreaction under a hydrocracking condition, and separating and fractionating the reaction effluent to obtain heavy naphtha, low-condensation-point diesel oil and unconverted oil. According to the method, high-quality gasoline blending components and low-condensation-point diesel oil can be obtained, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to a processing method of wax oil components, specifically a production method for producing high-quality gasoline by processing wax oil raw materials through catalyst gradation technology, and by-product liquid products such as high-quality high-quality low-condensation oil. Background technique [0002] Gasoline is one of the most used light petroleum products and is an important fuel for engines. It can be obtained from different units of petroleum refining. During crude oil processing, distillation, catalytic cracking, thermal cracking, hydrocracking, catalytic reforming and other units all produce gasoline components, but the octane number is different. For example, straight-run gasoline has a low octane number and cannot be used as engine fuel alone; in addition, the sulfur content of impurities is also different, so gasoline components with high sulfur content need to be desulfurized Refining, and finally, the above-mention...

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Problems solved by technology

[0006] CN101724454A introduces a hydrocracking method for producing high-octane gasoline. The raw material oil is mixed with hydrogen and enters the reactor for hydrofining and hydrocracking reactions in turn. Although it has the ability to process more inferior raw materials and the catalyst has a long operating cycle and hydrocracking products with good quality

[0007] CN103184073A introduces a hydrocracking method for producing high-octane gasoline blending components. The raw oil is subjected to controlled hydrofinishing and hydroconversion reactions, although the target product can be high-octane through technological control Gasoline or blending components, but the selection range of raw materials is still relatively simple, and heavy oil products cannot be used for production, and at the same time, the catalyst has not been effectively improved for the process

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