Novel process for reducing energy consumption of catalytic gasoline hydrogenation refining process

Abstract

The invention belongs to the technical field of petrochemical engineering and discloses a novel process for reducing energy consumption of a catalytic gasoline hydrogenation refining process. The process comprises the flows: removing alkadiene in catalytic gasoline from a catalytic cracking device by virtue of a whole fraction prehydrogenation device, and then feeding a whole fraction reactant into a stabilizing tower to separate light hydrocarbon less than or equal to C4 and excessive hydrogen; feeding stable gasoline at the bottom of the stabilizing tower into a prefrationation tower to separate light gasoline to be de-etherized, wherein the tower top pressure of the prefractionation tower is 0.07MPag, and the tower bottom temperature is 124.4 DEG C; feeding the pump-pressurized circulating material flow at the bottom of the prefractionation tower into a heat exchange at the top of a heavy cut tower; after heat removal, turning heat to the tower bottom, wherein the tower top temperature of the heavy cut tower is 0.56Mpag and the tower top temperature is 156.0 DEG C; and finally, feeding the prefrationated gasoline at the tower bottom of the prefrationation tower into the heavy cut tower to be divided into medium gasoline and heavy gasoline, and separately feeding the medium gasoline and the heavy gasoline to hydrogenation sections in different reaction depths. The process disclosed by the invention can be used for reducing energy consumption to a great extent and has a good energy-saving benefit.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a new process for reducing energy consumption in catalytic gasoline hydrogenation refining process. Background technique [0002] Catalytic cracking is one of the core secondary processing processes of petroleum distillates. In my country, more than 70% of gasoline is produced by catalytic cracking. However, due to the increasing weight of raw materials, high sulfur content, and thermal cracking during the process, catalytic gasoline is far from meeting the national standards, and methods such as hydrofining must be used to remove impurities such as sulfur, nitrogen, olefins, and aromatics that exceed the standard. However, the hydrogenation process is an olefin saturation process, which will reduce the octane number of gasoline. In order to balance this contradiction, a common method is selective hydrogenation, which is to separate catalytic gasoline...

AI Technical Summary

Problems solved by technology

It can be seen that the independent separation of the three towers consumes a lot of energy, and the total reboil and total cooling loads reach 18534.2kw and 19202.3kw respectively

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