Hydrofining process for catalytically cracked crude gasoline

Abstract

The invention discloses a hydrofining process for catalytic cracking crude gasoline, which is improved on the basis of the original catalytic cracking and catalytic stabilization gasoline hydrofiningprocess flow as follows: catalytic crude gasoline is directly fed into a gasoline hydrofining device instead of being fed into an absorption tower, and other processes are not changed. Therefore, a catalytic absorption stabilizing system only processes rich gas and does not process crude gasoline, so that the load and the energy consumption are greatly reduced; the hydrogenation operation is not influenced by a component which is not more than C4 and is brought into hydrogenation along with crude gasoline, the component is pulled out from a stripping tower along with acidic components such asH2S and NH3, the components are returned to the catalytic refinery along with the original process, and the steam pressure of the gasoline is stabilized by the product, so that the steam pressure of the gasoline is ensured; a small amount of gasoline which is absorbed and stabilized is brought in along with rich gas to be continuously distilled from the bottom of a stabilizing tower, and is mixedwith crude gasoline for hydrogenation after heat exchange, so that the material balance of the combined device is not changed.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a catalytic cracking naphtha hydrotreating process. Background technique [0002] Catalytic cracking is one of the main methods for the secondary processing of petroleum distillates. It is a process in which heavy distillates are converted into diesel, gasoline and gas under the action of high temperature and catalyst. It consists of four parts: reaction regeneration, main fractionation, absorption stabilization and flue gas energy recovery. Its absorption and stabilization function is to convert the rich gas and naphtha from the main fractionation tower into qualified products, including six main units including rich gas compressor, condensed oil tank, absorption tower, reabsorption tower, desorption tower and stabilization tower . Among them, the role of the reabsorption tower is to use the diesel oil to absorb the top gas twice, so as to obtain ≥C ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the existing catalytic cracking unit and catalytically stabilized gasoline hydrofining unit due to the isolated design, resulting in repeated fractionation of stable gasoline, large processing capacity and high

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