Delayed coking method for processing high-acid crude oil

Abstract

The invention discloses a method for processing high-acid crude oil by a delayed crude oil process. In the method, low-temperature high-acid crude oil enters the upper part of a reactor; high-temperature low-acid coking raw material enters the bottom of the reactor; a high-temperature oil gas generated from the low-acid coking raw material through pyrolysis is mixed with the low-temperature high-acid crude oil on the upper part of the reactor; therefore, the high-acid crude oil is pyrolyzed and deacidified at an appropriate high temperature so as to fulfill the aim of deacidification; and simultaneously, the injection of the low-temperature high-acid crude oil reduces the cracking temperature of the low-acid coking raw material, shortens the pyrolysis time of a low-acid raw material, and reduces secondary reactions, thereby reducing the coke formation rate and prolonging the stable operating period of a single tower. The delayed coking method for processing the high-acid crude oil hasthe characteristics that the preheating temperature of the high-acid crude oil can avoid a strong corrosion phase of an acid, and can reduce or even avoid the corrosion of the acid on heating equipment even below a corrosion temperature.

Description

technical field [0001] The invention belongs to a thermal cracking deacidification process, in particular to a method for removing acidic compounds in high-acid crude oil during delayed coking operation. Background technique [0002] In recent years, the exploitation of high-acid crude oil in the world has increased year by year, and the higher the acid value of crude oil, the lower the price. 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. The biggest problem is how deacidification can reduce equipment corrosion. [0003] The corrosion effect of naphthenic acid in high-acid crude oil on equipment is greatly affected by temperature, and there is almost no corrosion effect below 220°C. As the temperature incre...

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Problems solved by technology

Both of the above two methods need to heat the high-acid crude oil in a heating furnace and go through a stage of strong corrosion. Therefore, these two methods cannot avoid the severe corrosion of the heating equipment by the naphthenic acid in the high-acid crude oil

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