Catalytic cracking method for processing highly acidic crude oil

Abstract

The invention discloses a method for processing highly acidic crude oil, in particular relates to a method for removing petroleum acid in the highly acidic crude oil by utilizing a dual lifting pipe fluidized catalytic cracking technology. The method adopts a dual-riser feeding, catalyst two-stage regeneration process, the highly acidic crude oil is used as the feeding of a second lifting pipe to contact with the regeneration catalyst from the first section of a regenerator, and a conventional catalytic cracking raw material is used as the feeding of a first lifting pipe to contact with a high-temperature regeneration high-activity catalyst from the second section of the regenerator. The highly acidic crude oil and the conventional catalytic cracking raw material respectively react with the regeneration catalysts with different carbon contents in respective lifting pipes under respective optimized technological conditions so as to improve the reaction process of various raw materials, match the activity of the raw materials and the regeneration catalysts, have the advantages of short reaction detention time, two reaction generation reduction, and the like, thereby further rationalizing the product distribution.

Description

technical field [0001] The invention relates to a method for processing high-acid crude oil, in particular to a method for processing high-acid crude oil by using a riser catalytic cracking process. Background of the invention [0002] In recent years, the extraction of high-acid crude oil in the world has been increasing year by year. It is reported that in 2004 it increased by 72.7% compared with 1984. Moreover, the price of high-acid crude oil in the international crude oil market is generally low. Therefore, it will have better economic benefits for refineries to process high-acid crude oil. However, since the acid compounds contained in high-acid crude oil mainly exist in the form of naphthenic acid, naphthenic acid is easy to react with iron or iron sulfide, causing serious corrosion to refinery equipment, so the refinery is facing difficulties in processing high-acid crude oil The problem is how to deacidify and reduce equipment corrosion. [0003] The concentratio...

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Problems solved by technology

In the case of catalyst deactivation, the reactant stream needs 2-3S (or longer residence time) in the upward promotion process. Further occurrence of non-ideal thermal cracking reactions leading to poor product distribution

Because the high-acid crude oil is heavy, with high residual carbon and heavy metal content, when the high-acid crude oil contacts the high-temperature catalyst at the lower part of the riser, the vaporization of the raw material is insufficient, and the inlet of the riser is easily blocked.

[0008] In addition, after the high-acid crude oil and low-acid crude oil are mixed, they enter the riser for catalytic cracking processing. There is a fatal weakness that the mixed oil reacts in the same reactor, resulting in vicious competition between adsorption and reaction.

Asphaltenes, carbon residues, and heavy metals in high-acid crude oil are easily adsorbed and deposited on the catalyst, leading to catalyst deactivation and hindering the adsorption-reaction of conventional catalytic cracking raw materials

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