Coking method for processing highly acid crude oil

A high-acid crude oil and high-temperature coking technology is applied in the field of thermal cracking and deacidification to achieve the effects of increasing heating temperature, increasing reaction temperature and processing capacity, and avoiding corrosion

CN101280213AActive Publication Date: 2008-10-08CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-10-08

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Abstract

The invention discloses a method of processing highly-acidic crude oil through the delayed coking process; the method includes that the low temperature highly-acidic crude oil is fed from the middle-lower part and the high temperature low-acidic coking raw material is fed from the bottom; the high temperature oil gas generated by the high temperature cracking of the low-acidic coking raw material is mixed with the low temperature highly-acidic crude oil so that the highly-acidic crude oil is enabled to realize the purpose of the deacidification through the pyrolysis deacidification under high temperature; meanwhile, the cracking temperature of the low-acidic coking raw material is lowered; the high temperature cracking time of the conventional raw materials; thereby, the coking yield is reduced and the stable operation period of the single tower is prolonged; besides, the preheating temperature of the highly-acidic crude oil can avoid the strong corrosion stage of the acid; the corrosion on the heating device caused by the acid can be reduced or avoided when the temperature is even lower than the corrosion temperature.
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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...

Examples

Embodiment 1-15

[0051] Example description: the deacidification effect of the method provided by the present invention.

[0052] The calculation method of deacidification rate is as follows: deacidification rate=(total acid value of high-acid crude raw material-total acid value of obtained liquid phase product) / total acid value of high-acid crude raw material×100%.

[0053] All experiments in the examples use the same raw material oil, aiming to compare the deacidification effects under different operating conditions.