Processing method for hydrogenation of catalytically cracked gasoline and reduction of octane number loss

Abstract

The invention discloses a processing method for hydrogenation of catalytically cracked gasoline and reduction of octane number loss, which comprises the following steps: (1) a catalytically cracked gasoline pre-hydrogenation unit: enabling FCC gasoline to pass through a filter and a coalescer, enter a buffer tank, and pass through a booster pump, a raw material and heavy gasoline heat exchanger and a raw material and diesel heat exchanger; (2) a catalytic reaction rectification unit: enabling the pre-hydrogenated gasoline to enter a catalytic reaction rectification tower, and pumping a gasoline component at the top of the rectification tower to a product tank through an air cooler, an aftercooler and a light gasoline product pump; (3) a DSO-M heavy gasoline hydro-upgrading unit: enabling the tower bottom product heavy gasoline to pass through a heavy gasoline product pump and to be conveyed to a gasoline hydrogenation device through a raw material and heavy gasoline heat exchanger; and(4) feeding diesel oil at the tower bottom to a diesel oil hydrogenation device. The technology is advanced, the technological process is flexible, the method can be combined with an existing gasoline hydrogenation device, the octane number loss is reduced, meanwhile, the processing amount of refinery gasoline is integrally increased, heat exchange is conducted on products and raw materials, andthe energy-saving effect is achieved.

Description

technical field [0001] The invention relates to a method for processing gasoline in an oil refinery, in particular to a method for hydrogenating catalytic cracking gasoline and reducing octane loss. Background technique [0002] Starting from July 1, 2019, the National VI standard has been implemented for gasoline brands used in some cities in the country. Compared with national IV and national V grades, the sulfur content is reduced to 10μɡ / ɡ; the olefin content is ≤8%; the volume fraction of aromatics is ≤35%; the volume fraction of benzene is ≤1.0%. Catalytic cracking (FCC) gasoline is the main component of refined gasoline, and FCC gasoline accounts for about 75% of gasoline in China. The sulfur content in FCC gasoline is 300-2000 μg / g, and the olefin content is 40-60 (v)%. FCC gasoline hydrodesulfurization has been used as the main production process of gasoline products. The problems faced by domestic gasoline hydrogenation technology include: ① large olefin loss cau...

AI Technical Summary

Problems solved by technology

The problems faced by domestic gasoline hydrogenation technology include: ① large loss of olefins caused by hydrogenation process; ② large loss of research octane number (RON) (more than 2-3 units), etc.

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