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Pre-treatment process method of high acid crude oil

A technology of high-acid crude oil and process method, which is applied in the direction of refining with two or more solvents, dehydration/demulsification with electricity/magnetism, etc. It can solve the problems of high-acid crude oil density and high viscosity, and achieve less alkali consumption , The agent-oil ratio is small, and the effect of improving product quality

Active Publication Date: 2014-05-21
长江三星能源科技股份有限公司
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AI Technical Summary

Problems solved by technology

[0006] In general, high-acid crude oil has high density and high viscosity, and there is no suitable process to combine deacidification and desalination

Method used

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  • Pre-treatment process method of high acid crude oil

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specific Embodiment

[0029] The present invention is described in detail by using the implementation case of a high-acid crude oil pretreatment process in this patent application, but the scope of the present invention is not limited.

[0030] The composition of extractant is ethanol 5%, ethylene glycol 85%, glycerol 7%, sodium hydroxide 3%, test process operating conditions are shown in Table 1, and adopting process technology pretreatment effect of the present invention is shown in Table 2.

[0031] Table 1 Operating conditions of high-acid crude oil pretreatment

[0032]

[0033] Table 2 Properties of crude oil before and after pretreatment

[0034]

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Abstract

The invention relates to a pre-treatment process method of high acid crude oil. The method comprises the following steps that high acid crude oil is treated by coupling deacidification and electro-desalting processes by combining chemical extraction and electro-desalting; a first level tank is taken as a deacidification and electro-desalting tank; a demulsifier and an extractant are injected before a crude oil electro-desalting static mixer; after being fully mixing with crude oil, the mixture enters into the first level desalting tank; generated naphthenate and salt-containing sewage in the crude oil are dissolved in the extractant; treated deacidified oil enters into second and third level desalting tanks after being mixed with the demulsifier and water through the static mixer for desalination and dehydration; treated crude oil enters into a subsequent heat exchange unit; after a period time of operation of an electro-desalting system, impurities such as mud in raw material oil are flushed by a non-stop back purge device to discharge mud-containing sewage out of the tank; an extract phase is acidified to separate out naphthenic acid which is further extracted and purified by light dydrocarbon, and the extractant is purified and recovered and recycled.

Description

Technical field [0001] The invention belongs to a method for removing petroleum acid, salt and water in crude oil by coupling high-acid crude oil chemical extraction and electric desalting. technical background [0002] With the depletion of oil resources and the continuous improvement of oil recovery technology, a large amount of high-acid value crude oil has been extracted. At present, the output of high-acid crude oil in the world crude oil market accounts for about 5% of the total global crude oil output every year, and the annual growth rate of 0.3 % growth rate. In 2009, the global high-acid crude oil production exceeded 400 million tons, accounting for 10% of the total crude oil production; my country's high-acid crude oil production was about 57 million tons per year, accounting for about 30% of the country's total crude oil production. During the refining process, the naphthenic acid contained in the high-acid crude oil can cause corrosion of the refinery unit, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/02C10G33/02
Inventor 刘建春李泓韦伟王龙祥程刚
Owner 长江三星能源科技股份有限公司
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