Method for processing highly acid crude oil by using delayed coking process

Abstract

The invention discloses a method of machining highly-acidic crude oil through delayed coking; the method includes that highly-acidic raw material and low-acidic raw material are processed in different coking towers; the high temperature oil gas enters the same fractionating tower after the treatment; the preheated low-acidic raw material is used for leaching the coke powder in the high temperature oil gas which enters the fractionating tower and circulating the wax slop back to the low-acidic raw material coking tower. The method of machining highly-acidic crude oil through delayed coking hasthe advantages that the problem that the coke powder in the high temperature oil gas generated by coking during the single passing of the highly-acidic raw material cannot be eliminated through leaching in the prior art is solved; the heat energy of the fractionating tower is recovered effectively; meanwhile, the single passing operation mode is adopted by the highly-acidic crude oil coking towerto facilitate improving the processing load of the highly-acidic crude oil; besides, the wax slop can be circulated back to the low-acidic raw material coking tower for further treatment.

Description

technical field [0001] The invention belongs to a thermal cracking deacidification process, specifically a method for removing acidic compounds in high-acid crude oil by adopting a delayed coking process and simultaneously converting high-acid crude oil into light distillate oil. Background technique [0002] The concentration or amount of acid in petroleum is expressed using the total acid number. The total acid number (TAN) refers to the number of milligrams of potassium hydroxide (KOH) required to neutralize all acidic components of 1 gram of crude oil or petroleum fractions, and the unit is mg KOH / g. The acid compounds contained in petroleum mainly exist in the form of naphthenic acid, which is easy to react with iron or iron sulfide in oil refining equipment, causing corrosion of towers, heating furnaces, pipelines, heat exchangers and other oil refining equipment. It is generally believed that if the total acid value in petroleum exceeds 1mg KOH / g, acid corrosion will...

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Problems solved by technology

In this method, the high-acid crude oil is directly put into the heating furnace to be heated to 350°C-450°C, and then enters the moderate cracking reactor for reaction to remove the acid components, and then the generated low-acid heavy cracked product enters the radiant section of the heating furnace and is heated to After entering the coking tower at 480°C-510°C for pyrolysis reaction, a large amount of coke powder is entrained in the generated high-temperature oil gas, which directly enters the middle and upper part of the fractionation tower due to the lack of leaching of raw material oil, resulting in coking in the fractionation tower and shortening the fractionation tower start-up period, and the coke powder content in coker gas oil is too high, which affects the quality of coker gas oil

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