Method for recovering multiple components through dilute ethylene

Abstract

The invention relates to a method for recovering multiple components through dilute ethylene. The method sequentially comprises the following steps of after water washing catalytic cracking dry gas containing ethylene with the concentration of 15 to 25V percent, desorbing residual ethanol amine to enable the ammonia nitrogen content in the raw material dry gas to be smaller than 100ppm; after preliminarily preheating cold dry gas through a first heat exchanger, continuously preheating through a second heat exchanger, then entering a raw material heating furnace for heating to the reaction trigger temperature, and entering a catalytic reactor for reacting to generate a fuel oil component and a liquefied petroleum gas component; feeding a reaction product into the second heat exchanger for preheating the raw material dry gas for the second time, carrying out fractionation on the cooled reaction product, pumping fractionated heavy fuel oil components out from a tower bottom of a fractionating tower, cooling through a first cooler, then feeding into a heavy fuel oil storage tank through an oil pump, and storing; distilling off a fractionated oil gas component from a gas phase outlet ofthe fractionating tower on the top part of the fractionating tower, and entering a hot side of the first heat exchanger for preheating the raw material dry gas for the first time. The method can be used for directly recovering fuel oil components, liquefied petroleum gas and other components.

Description

technical field [0001] The invention relates to a method for recovering multiple components from dilute ethylene, which belongs to the technical field of oil refining technology. Background technique [0002] Catalytic cracking is one of the main methods of petroleum secondary processing. Under the action of high temperature and catalyst, heavy oil undergoes cracking reaction and is transformed into cracked gas, gasoline and diesel oil. The main reactions are decomposition, isomerization, hydrogen transfer, aromatization, condensation, coke and so on. Compared with thermal cracking, its light oil yield is high, gasoline octane number is high, diesel oil stability is better, and liquefied gas rich in olefins is produced by-product. [0003] The dry gas yield of the existing catalytic cracking unit is 2-5%, and the dry gas contains hydrogen, ethylene, methane, ethane and other components, and the ethylene concentration is 15-25V%. In small and medium-sized refineries, the d...

AI Technical Summary

Problems solved by technology

In small and medium-sized refineries, the dry gas of the catalytic cracking unit is generally used as fuel gas and enters the gas pipeline network to be used as fuel for heating furnaces and boilers of various devices, and the remaining fuel gas is sent to the flare system to be burned, resulting in waste of ethylene resources, and at the same time also polluted the environment

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