Separation method of hydrocarbon reaction oil gas

Abstract

Disclosed a separation method of hydrocarbon reaction oil-gas transfers the catalytic cracking reaction oil-gas with C2-C4 hydrocarbon via the bottom into the preliminary fractional tower comprising a tower kettle, a cooling washing area, and a heat transfer fractional area, to be contacted with the catalytic cracking heavy raw material adverse current which is filled from the top of tower. Then the catalyst grains in the reaction oil-gas are removed in the tower kettle and the cooling washing area while the temperature is reduced too; the temperature of reaction oil-gas is reduced more and the heavy components are condensed to be fed into heavy raw material, in the heat transfer fractional area; the temperature reduced reaction oil-gas via the top of preliminary fractional tower is transferred to the following separation system; the temperature of heavy raw material is increased in the process of flowing downwards along the heat transfer fractional area, to be extracted in this process as the raw oil to be fed into catalytic cracking reactor. The invention can realize the simple and effective separation on the high temperature and high gas concentration reaction oil-gas with the catalyst grains.

Description

technical field [0001] The invention relates to a method for separating oil and gas of catalytic cracking reaction, in particular to a method for separating oil and gas of catalytic cracking reaction rich in C2, C3 and C4 hydrocarbons. Background technique [0002] Fluid catalytic cracking is one of the important processes of petroleum secondary processing. It uses acidic solid catalysts to contact and react with petroleum hydrocarbons in a fluidized state to convert heavy petroleum hydrocarbons into light petroleum such as gasoline and diesel. products and light hydrocarbons. At present, with the shortage of light feedstock oil, it has become a development trend to use heavy feedstock to produce light olefins through catalytic cracking. [0003] CN1069016A discloses a catalytic conversion method for producing light olefins by utilizing heavy petroleum hydrocarbons. A solid acid catalyst is selected. Under the conditions of a reaction temperature of 650-900°C and an agent-t...

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Problems solved by technology

Due to the large amount of gas produced by catalytic cracking, the high temperature of the reaction oil gas, and the limitation of the gas phase velocity and heat load in the tower, the separation process of the conventional FCC main fractionation tower has been difficult to meet this separation requirement.

In addition, due to the heavy cracking raw materials and the solid catalyst particles contained in the cracked gas, the traditional separation process of steam cracking to ethylene is not suitable for the process of catalytic cracking to light olefins

For ordinary structural packing, in the separation of petroleum hydrocarbons containing catalyst particles, the catalyst particles are easy to block the pores of the packing, and it is also easy to cause coking of high-temperature oil and gas

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