Method for processing highly acidic crude oil

Abstract

The invention relates to a method for processing highly acidic crude oil, in particular to a method for removing petroleum acid in the highly acidic crude oil by utilizing a fluidized catalytic cracking technology. The method adopts a lifting pipe two-stage feeding technology and comprises the following steps: pretreating and preheating the highly acidic crude oil to be injected in the middle of the lifting pipe as the second-stage feeding of the catalytic cracking lifting pipe; enabling the second-stage feeding to mix and contact with reaction products from an upstream first stage and a catalyst parched with partial coke; and achieving the aim of deacidifying the mixture by a catalytic reaction, a cracking reaction and a decarboxylation reaction so as to avoid the corrosion of sequent processing equipment and accord with the acidity requirement of the product. Compared with a CN1827744A method, the highly acidic crude oil enters a second stage of the lifting pipe and contacts with thepartial parched catalyst from the first stage to have a slow cracking reaction so as to benefit the generation of medium distillate oil and avoid generating a great amount of dry gas and coke causedby an intense reaction generated by the contact of the highly acidic crude oil and the high-temperature high-activity catalyst.

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 catalytic cracking technology. 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. Because 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 refining equipment, so the supply of high-acid crude oil exceeds demand in the international crude oil market. Prices are generally lower. Therefore, processing high-acid crude oil in refineries will have better economic benefits, but the problem faced by refineries in processing high-acid crude oil is how to deacidify and reduce equipment corrosion. [0003] The corrosion effect of naph...

AI Technical Summary

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

In addition, 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 in the lower part of the riser, the vaporization of the raw material is insufficient, and the inlet of the riser is likely to be blocked.

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